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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Monday, 14 June 1999 |
From Subject
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001 Paul Graham [v_notch at hotmail.com] Re: Cool season naders..
002 Paul Graham [v_notch at hotmail.com] Supercellular Movement
003 John Woodbridge [jrw at pixelcom.net] Electronic baro..
004 John Woodbridge [jrw at pixelcom.net] Frosty mornings
005 Ira Fehlberg [jra at upnaway.com] Supercellular Movement
006 Ira Fehlberg [jra at upnaway.com] Re: Cool season naders..
007 Jacob [jacob at iinet.net.au] Storms in Perth
008 Sam Barricklow [k5kj at pulse.net] 990531 Sitka, KS Tornado
009 Lindsay [writer at lisp.com.au] Cooling down over Sydney
010 Phil Bagust [paisley at cobweb.com.au] Re: Cool season naders..(Adelaide)
011 Anthony Cornelius [cyclone at rmitel.com.au] Snow in Orange!
012 Dean S [deansgar at alphalink.com.au] Supercellular Movement
013 "Dane Newman" [dpn at bigpond.com] Re Snow in Orange
014 Jimmy Deguara [jimmyd at ozemail.com.au] Re: Cool season naders..(Adelaide)
015 "Phil Schubert" [philip at zedley.com] Storms in Perth
016 Anthony Cornelius [cyclone at rmitel.com.au] Electronic baro..
017 Chris Maunder [cmaunder at dynamite.com.au] Snow near Canberra
018 "Michael Thompson" [michaelt at ozemail.com.au] Winds now Gale Force in Illawarra
019 Jimmy Deguara [jimmyd at ozemail.com.au] snow chasing
020 disarm at braenet.com.au wind warning for NSW
021 Jimmy Deguara [jimmyd at ozemail.com.au] snow chasing
022 Anthony Cornelius [cyclone at rmitel.com.au] Winds now Gale Force in Illawarra
023 wbc at ozemail.com.au (Laurier Williams) snow chasing
024 Anthony Cornelius [cyclone at rmitel.com.au] Supercellular Movement
025 Jimmy Deguara [jimmyd at ozemail.com.au] radar and low cloud
026 Jacob [jacob at iinet.net.au] Storms in Perth
027 "Jane ONeill" [cadence at rubix.net.au] Melbourne sea to mountains chase
028 Phil Bagust [paisley at cobweb.com.au] Cold air anvil
029 Lindsay [writer at lisp.com.au] Snow
030 "Marty" [martyp at dynamite.com.au] Re: Cool season naders..
031 Patrick Tobin [pdtobin at hotmail.com] Snow near Canberra
032 Chas & Helen Osborn [hosborn at tassie.net.au] Composite World Satellite Image
033 "Jane ONeill" [cadence at rubix.net.au] MSC updates
034 Michael Bath [mbath at ozemail.com.au] Composite World Satellite Image
035 Michael Bath [mbath at ozemail.com.au] NE NSW weather 14/6
036 Patrick Tobin [pdtobin at hotmail.com] Cloud off NSW + Canberra temp
037 Ben Quinn [bodie at flatrate.net.au] Brisbane gales
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001
X-Originating-Ip: [203.2.193.71]
From: Paul Graham [v_notch at hotmail.com]
To: bodie at flatrate.net.au
Cc: aussie-weather at world.std.com
Subject: aus-wx: Re: Cool season naders..
Date: Sun, 13 Jun 1999 07:40:12 PDT
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Ben,
As I understand, these types of tornadoes occur in cold, post-frontal
environments with negative, low-level (up to about 700Hpa) LI's and strong
low-level shear (usually just after the front). I believe the orientation
of the coastline can also play a role. They are most common in the SW of WA
and in parts of SA and Victoria and are mostly fairly weak - in the order of
f0 intensity on the Fuijita scale.
To me, the situation today looked favourable with a very cold unstable SW
airstream and embedded thunderstorms just behind the front. Since the
Bureau doesn't have an official tornado warning product for SA (probably no
need), I was a bit suspicious of the warning that was issued (the Severe
Weather Advice) today. I thought that perhaps the forecasters at the Bureau
may have been thinking of the risk of these tornadoes when issuing the
warning. For more information regarding the environments most conducive to
these types of tornadoes, just have a look at the Bureau's site:
http://www.bom.gov.au/bmrc/regn/expt/tornado/SA/coldies_sa.htm
With regard to hailsize and the wetbulb zero temperature, I am not too sure.
I think it may be due to the fact that hail favours temperatures greater
than about -5c due to the shapes of the ice crystals at these temperatures -
helps in aggregation (information obtained from "The Weather and Climate of
Australia and New Zealand" [Sturnam and Tapper]). The lower the WBZ height,
the lower the temperature of the cloud and the less likely hail will grow.
This is a just a suggestion.
- Paul G.
>From: Ben Quinn
>To: v_notch at hotmail.com
>Subject: Cool season naders..
>Date: Sun, 13 Jun 1999 17:32:16 +1000
>
>Hey Paul, Ben here..
>
>Just read your message to the list saying that you though their could be
>some "cool season naders in VIC and SA" today.. and i was just wondering
>what you would class as the right conditions for this? This topic has
>come up in IRC quite a few times, and becomes quite heated at times
>because people seem to have different opinions of what the right
>conditions are.. I would love to hear any thoughts you have on the
>topic..
>
>Also, i'm sure that you are familiar with the wet bulb zero indicie on
>an atmospheric sounding .. the information that i have on it on my
>soundings page states that rapidly decreasing hail size is likely for a
>wetbulb under 6000-5000 feet, and rapidly decreasing hail size for a
>wetbulb in excess of 11000 feet.. the 11000 feet i can comprehend.. but
>the under 5000 feet i'm am not 100% sure of.. can you offer an
>explanation for this?
>
>My thoughts are that if the wetbulb is too low, then the cloud is all
>ice.. and if there's too much ice and not enough liquid water then the
>water will not accumulate on the hail?
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002
X-Originating-Ip: [203.2.193.71]
From: Paul Graham [v_notch at hotmail.com]
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Supercellular Movement
Date: Sun, 13 Jun 1999 07:49:34 PDT
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Anthony,
the tendency, for a southern hemisphere case, is that left-movers will move
slower than the mean wind speed calculated over a certain thickness (I think
something like 1000 to 500) for a cyclonic mesocyclone while the
anti-cyclonic, right-mover will move faster than the mean wind speed and
die. However, if the mesocyclone is anticyclonic, you can end up with a
fast moving left mover and a slow moving right mover. It all depends on the
sort of hodograph you end up with and the values of helicty.
An example of just how confusing this can be, the March 1990 Sydney
hailstorm was a left-mover, faster than the mean wind speed making it a
candidate for the equivalent of a northern hemisphere right-mover! In other
words, an anti-cyclonic mesocyclone...I think the new doppler radar will
help to clear up some of these issues.
- Paul G.
>From: Anthony Cornelius
>Reply-To: aussie-weather at world.std.com
>To: Australian Weather Mailing List
>Subject: aus-wx: Supercellular Movement
>Date: Sun, 13 Jun 1999 23:25:50 +1000
>
>Hi all,
>
>I was reading something interesting last night, in regards to
>supercellular movement. It's for the "double vortex" structure - one
>with a "dual rotation," one vortex rotates clockwise, the other
>anti-clockwise. It's for the US - but you could reverse the order in
>what they say....and when you do, you get that if the clockwise rotation
>is stronger, it induces thunderstorm movement to the left, and if the
>anticlockwise rotation is stronger, it induces thunderstorm movement to
>the right. This is for a westerly jetstream. The clockwise rotation is
>your updraft, anti-clockwise is your downdraft.
>
>One interesting observation that always seems to be made with
>supercells, is they move in a direction different then that to other
>thunderstorms in the area. I was thinking that, in order for a
>supercell to sustain itself, the updrafts would have to be equal to, or
>greater than the downdrafts in order to sustain itself. So, if the
>cyclonic updraft were stronger then the anti-cyclonic downdraft, then it
>would indicate thunderstorm movement slightly to the left. Now - a lot
>of storms in SE QLD/NE NSW move SW to NE, supercells tend to move NNE to
>N'ly (and can sometimes propogate slightly W) - this is in line with the
>explanation of the movement of supercells. The Sydney supercell also
>took a NNE path, instead of a NE'ly path - another example.
>
>I'd be interested to see if anyone had any thoughts on this?
>
>Anthony Cornelius
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>
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003
From: John Woodbridge [jrw at pixelcom.net]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: RE: aus-wx: Electronic baro..
Date: Mon, 14 Jun 1999 00:55:31 +1000
Organization: Pixel Components Pty Ltd
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Hi again Anthony,
Guess what, I put new batteries in my electronic doodad, and the indicated
barometric pressure immediately jumped 15hPa. Is that SUS or what???
Humidity & temp readings apparently unaffected, but the baro is obviously
highly dependent on battery voltage, to the point where it just about voids
it's usefulness I would suggest.
I went back over my readings to see if I could pinpoint the day when it
started to go out of kilter, but it is not obvious, at least 2 weeks it
would seem. The 'batt' warning indicator has been showing for around 2
months, but I quietly ignored it as the unit seemed to be working just
fine..... I think either you or James has one of these, so be warned....
For others on the list, the doodad I'm referring to was purchased from an
Australian Geographic store, it was a gift so I'm not sure of the price, I
suspect in the vicinity of $200. It is a upright thin profile freestanding
unit with a front panel LCD displaying temp, humidity, baro pressure, a 24
hr baro histogram, & date/time. It carries no brandname other than 'made
in china' and takes 4 x AAA batteries.
John.
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004
From: John Woodbridge [jrw at pixelcom.net]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: RE: aus-wx: Frosty mornings
Date: Sun, 13 Jun 1999 23:40:46 +1000
Organization: Pixel Components Pty Ltd
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Ho Anthony,
Strange but apparently true, it didn't seem that cold Sat morning, and that
little Westerly breeze kept at it all night, I recorded a min of 8.0C,
which is quite a bit warmer than both the Airport and apparently Ipswich
(13k's to the South) which was reported in the evening news as 0C (suspect
it was the Amberley reading which was translated to "Ipswich" by the media
- but the two are poles (well... many miles) apart.
Now I was a little suspicious of this and thought that maybe the proximity
of my min/max to the house was distorting the reading, so I tackled the
problem on Sunday morning with a second 'min/max' conveniently located near
my rain guage about 2' off the ground in the largest open area I have, with
the electronic doodad left outside as a control. Sunday morning was much
colder, dead calm, and I recorded 5C on my normal min/max, and 3C on the
one near the rain guage. At 9:00pm the normal min/max read 11.0C, the
electronic doodad 11.0C, and the one near the rain guage 10.0C (the 1C
being a common factor which has always differentiated the two min/max's,
and which led me to dump the one I put out near the rain guage).
Moreover, on Sunday morning Brisbane AP recorded 7C and Amberley -1C, so
given my location, a reading of 3 would be close to a linear drop between
the AP and Amberley. So what happened on Saturday?????
Puzzled
John.
>snip
My dad rang me this morning (at the unheard of hour of 8:30am!! hehe) to
tell me they had frost there. He is about 80-100km WSW of Brisbane.
When he woke up, the air temperature was 0C. It was BLOODY COLD
here!!!! 5C at the Brisbane AP, 0C at Amberly, -1 at Kingaroy, -3 at
Stanthorpe and Warwick, -4 at Texas and Oakey...
I've had enough of winter now, where's summer!?
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005
X-Sender: jra at upnaway.com
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Date: Sun, 13 Jun 1999 12:46:25 +0800
To: aussie-weather at world.std.com
From: Ira Fehlberg [jra at upnaway.com]
Subject: Re: aus-wx: Supercellular Movement
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Just to confuse things more!!! Most supercells in WA seem to move NW/SEish
at first and then as sure sign of a supercell is a right move to the east
upon intensification. This can be often seen when other cells are present
as the others maintain their SE track. However, whilst chasing in the
Goldfields a few years ago i did witness what i thought was a supercell
that split. The cell split and the new cell moved from its original track
of WNW/ESE to SE and then straight S, whilst the other cell slowed down and
straightened to almost straight E. Confused i phoned the BOM from Kalgoolie
and Barry said to me straight away, "yeah you lucky bastard we can see em".
He explained to me that this was a "splitter" with a left mover and the
left moving cell would have anti-cyclonic rotation. Unfortunatley I did not
whitness a wall cloud. He explained that the split was due to this "double
vortex" structure in the original cell.
Just thought id share this info.
Ira Fehlberg
At 23:25 13/06/99 +1000, you wrote:
>Hi all,
>
>I was reading something interesting last night, in regards to
>supercellular movement. It's for the "double vortex" structure - one
>with a "dual rotation," one vortex rotates clockwise, the other
>anti-clockwise. It's for the US - but you could reverse the order in
>what they say....and when you do, you get that if the clockwise rotation
>is stronger, it induces thunderstorm movement to the left, and if the
>anticlockwise rotation is stronger, it induces thunderstorm movement to
>the right. This is for a westerly jetstream. The clockwise rotation is
>your updraft, anti-clockwise is your downdraft.
>
>One interesting observation that always seems to be made with
>supercells, is they move in a direction different then that to other
>thunderstorms in the area. I was thinking that, in order for a
>supercell to sustain itself, the updrafts would have to be equal to, or
>greater than the downdrafts in order to sustain itself. So, if the
>cyclonic updraft were stronger then the anti-cyclonic downdraft, then it
>would indicate thunderstorm movement slightly to the left. Now - a lot
>of storms in SE QLD/NE NSW move SW to NE, supercells tend to move NNE to
>N'ly (and can sometimes propogate slightly W) - this is in line with the
>explanation of the movement of supercells. The Sydney supercell also
>took a NNE path, instead of a NE'ly path - another example.
>
>I'd be interested to see if anyone had any thoughts on this?
>
>Anthony Cornelius
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> -----------------------jacob at iinet.net.au------------------------------
>
>
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006
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Date: Sun, 13 Jun 1999 12:47:16 +0800
To: aussie-weather at world.std.com
From: Ira Fehlberg [jra at upnaway.com]
Subject: Re: aus-wx: Re: Cool season naders..
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Just want to add my two bobs worth,
Cold air tornadeos here in WA are for the most part weak (F-0
F-1ish) and short lived (2-10K's) tho we have had several F-2 and F-3
events here in the last few years, about 10 in the last 10 years alone,
plus many others over the years. There is also a record of a 100km long
300m wide cool season tornado in Victoria in 1926, in which one person was
killed.
Distinctive features that occur along with cool season tornadoes here are,
an intense polar low with a strong surface pressure graident, low level
convergence and instability upstream and in close proximity to the axis of
these surface to 850hpa shear. This usually occurs at the front of the jet
axis at 950hpa and 850hpa with the flow indicating acceleration of the low
level jet. These wind speeds provide the shear and are also the vertical
circulation thus providing the lifting mechanism. This is why tornadoes
often occur here with lifted index figures of no greater than 0. One would
normally think that with low lifted index readings tornadoes would not
occur. However another stumbling block is also the shear because tornadoes
have occured here without the required shear i explained above. Some lows
seem to create their own shear due to the speed at which they travel. As
the become land-bourne they can start the air under them rolling anyway and
this usually isnt picked up untill after the event occurs. Cool season
tornadoes usually occur on the cyclonic shear side of a strong jet streak.
What the BOM look for here is days with 30knots of shear and lifted index
(700hpa SLI) of 0 or negative values and CAPE values of 200-400 J/jk. WA
has an average of 10 such days per year as does south of and including
Adelaide. As one can see CAPE values and lifted index values dont really
need to be like those we would expect for summer events. We need to be
aware that strong cool season tornadoes can occur in weak buoyency
enviroments if there is strong low level shear. Shear is the key as it is
with summer supercells however the source is different. Also due to low
cell tops in winter compared with summer events any 500hpa data is
basically useless.
Ira Fehlberg
At 07:40 13/06/99 PDT, you wrote:
>Hi Ben,
>As I understand, these types of tornadoes occur in cold, post-frontal
>environments with negative, low-level (up to about 700Hpa) LI's and strong
>low-level shear (usually just after the front). I believe the orientation
>of the coastline can also play a role. They are most common in the SW of WA
>and in parts of SA and Victoria and are mostly fairly weak - in the order of
>f0 intensity on the Fuijita scale.
>To me, the situation today looked favourable with a very cold unstable SW
>airstream and embedded thunderstorms just behind the front. Since the
>Bureau doesn't have an official tornado warning product for SA (probably no
>need), I was a bit suspicious of the warning that was issued (the Severe
>Weather Advice) today. I thought that perhaps the forecasters at the Bureau
>may have been thinking of the risk of these tornadoes when issuing the
>warning. For more information regarding the environments most conducive to
>these types of tornadoes, just have a look at the Bureau's site:
>http://www.bom.gov.au/bmrc/regn/expt/tornado/SA/coldies_sa.htm
>
>With regard to hailsize and the wetbulb zero temperature, I am not too sure.
> I think it may be due to the fact that hail favours temperatures greater
>than about -5c due to the shapes of the ice crystals at these temperatures -
>helps in aggregation (information obtained from "The Weather and Climate of
>Australia and New Zealand" [Sturnam and Tapper]). The lower the WBZ height,
>the lower the temperature of the cloud and the less likely hail will grow.
>This is a just a suggestion.
>- Paul G.
>
>>From: Ben Quinn
>>To: v_notch at hotmail.com
>>Subject: Cool season naders..
>>Date: Sun, 13 Jun 1999 17:32:16 +1000
>>
>>Hey Paul, Ben here..
>>
>>Just read your message to the list saying that you though their could be
>>some "cool season naders in VIC and SA" today.. and i was just wondering
>>what you would class as the right conditions for this? This topic has
>>come up in IRC quite a few times, and becomes quite heated at times
>>because people seem to have different opinions of what the right
>>conditions are.. I would love to hear any thoughts you have on the
>>topic..
>>
>>Also, i'm sure that you are familiar with the wet bulb zero indicie on
>>an atmospheric sounding .. the information that i have on it on my
>>soundings page states that rapidly decreasing hail size is likely for a
>>wetbulb under 6000-5000 feet, and rapidly decreasing hail size for a
>>wetbulb in excess of 11000 feet.. the 11000 feet i can comprehend.. but
>>the under 5000 feet i'm am not 100% sure of.. can you offer an
>>explanation for this?
>>
>>My thoughts are that if the wetbulb is too low, then the cloud is all
>>ice.. and if there's too much ice and not enough liquid water then the
>>water will not accumulate on the hail?
>
>
>______________________________________________________
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>
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007
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Date: Mon, 14 Jun 1999 02:26:18 +0800
To: aussie-weather at world.std.com
From: Jacob [jacob at iinet.net.au]
Subject: aus-wx: Storms in Perth
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Its currently 2:20am WST as I write this, quite a bit of lightning can be
seen to the west of Perth right now, the front is quite close to the coast
on the radar and should move through soon.
Jacob
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008
Date: Sun, 13 Jun 1999 13:15:49 -0500
From: Sam Barricklow [k5kj at pulse.net]
Organization: The Storm Shop http://www.thestormshop.com/
X-Mailer: Mozilla 4.6 [en] (Win98; U)
X-Accept-Language: en
To: Weather Chase Input [wx-chase at postoffice.cso.uiuc.edu]
Aussie Weather ,
SKYWARN Input ,
wx-chase-can List Member
Subject: aus-wx: 990531 Sitka, KS Tornado
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I've posted a preliminary web page with 29 video stills of the
Sitka, Kansas supercell and tornado at:
http://www.k5kj.net/990531.htm
The images have not been compressed yet and thumbnails have not
been created, so it may take a while to download unless you have a
very fast connection.
If you have a slow connection, then wait a few days and I will
have completed the page.
Sam Barricklow
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009
Date: Mon, 14 Jun 1999 03:44:35 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Cooling down over Sydney
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
---------------------------
No snow at Blackheath at 7:30am.
Light flakes now and then with a bit of ice but nothing to write home
about.
Some light falls last night at 9:30 and 10:20 and a heavier one at
midnight, followed by rain.
Currently zero degrees here and waiting...
Lindsay P.
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010
X-Sender: paisley at mail.cobweb.com.au
Date: Mon, 14 Jun 1999 09:14:30 +0930
To: aussie-weather at world.std.com
From: Phil Bagust [paisley at cobweb.com.au]
Subject: Re: aus-wx: Re: Cool season naders..(Adelaide)
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi all on this cold morning.
What a great start to winter! Hope I haven't put a hex on the rest of it.
Conditions in Adelaide now much calmer after several o/night squalls,
thunder and small hail. Haven't checked the official temps but my
thermometer only went over 10 for a few minutes y'day in a short sunny
break between squalls.
I've been following the cold weather funnel thread with interest.
Particularly liked Ira's contribution. I remember driving home from the
Flinders Ranges in July (1995?). We were in the cold sector behind a
front. It was a wild, very wet day in the northern Lofties, with
occasional hail squalls at higher altitudes. That night on the news was a
video of a cold air tornado a guy had taken about 100k north of Adelaide.
Nice elephants trunk over a nearby ridge with very black turbulent cloud
around. The worst thing was that I'd driven past this very spot less than
an hour after he'd taken it! Do'wp!
Phil 'Paisley' Bagust
paisley at cobweb.com.au
www.cobweb.com.au/~paisley
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011
Date: Mon, 14 Jun 1999 09:49:12 +1000
From: Anthony Cornelius [cyclone at rmitel.com.au]
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To: Australian Weather Mailing List [aussie-weather at world.std.com]
Subject: aus-wx: Snow in Orange!
Sender: aussie-weather-approval at world.std.com
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Hi all,
I had a friend from Orange contact me saying that it's snowing there,
she said not much, 2-3inches at the most, but enough to have a snowball
fight with her husband :-) She said there's a "black ice" covering the
roads, she even almost fell over trying to take photo's of it.
Anthony from a cold, windy Brisbane
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012
Date: Mon, 14 Jun 1999 10:03:01 +1100
From: Dean S [deansgar at alphalink.com.au]
X-Mailer: Mozilla 2.02 (Win95; I)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Supercellular Movement
Sender: aussie-weather-approval at world.std.com
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Hey Anthony. Your theory on supercell storm structure is very real and
possible. The double vortex is associated with the supercell and when
the mid-level wind shear snaps, (as explained by Tony Bannastar at the
BOM Severe Storms Section, Melbourne) causing two rotating, vertical
vortexes, it is very possible for one to be responsible for a cyclonic
updraught and a anti-cyclonic downdraught (U.S.). Or of course it could
be the opposite. This is one of the best theories I've heard. Would you
mind telling me where I can read this book/article? It would be great.
Thanks.
Deano
Anthony Cornelius wrote:
>
> Hi all,
>
> I was reading something interesting last night, in regards to
> supercellular movement. It's for the "double vortex" structure - one
> with a "dual rotation," one vortex rotates clockwise, the other
> anti-clockwise. It's for the US - but you could reverse the order in
> what they say....and when you do, you get that if the clockwise rotation
> is stronger, it induces thunderstorm movement to the left, and if the
> anticlockwise rotation is stronger, it induces thunderstorm movement to
> the right. This is for a westerly jetstream. The clockwise rotation is
> your updraft, anti-clockwise is your downdraft.
>
> One interesting observation that always seems to be made with
> supercells, is they move in a direction different then that to other
> thunderstorms in the area. I was thinking that, in order for a
> supercell to sustain itself, the updrafts would have to be equal to, or
> greater than the downdrafts in order to sustain itself. So, if the
> cyclonic updraft were stronger then the anti-cyclonic downdraft, then it
> would indicate thunderstorm movement slightly to the left. Now - a lot
> of storms in SE QLD/NE NSW move SW to NE, supercells tend to move NNE to
> N'ly (and can sometimes propogate slightly W) - this is in line with the
> explanation of the movement of supercells. The Sydney supercell also
> took a NNE path, instead of a NE'ly path - another example.
>
> I'd be interested to see if anyone had any thoughts on this?
>
> Anthony Cornelius
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> -----------------------jacob at iinet.net.au------------------------------
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013
From: "Dane Newman" [dpn at bigpond.com]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Re Snow in Orange
Date: Mon, 14 Jun 1999 09:59:29 +1000
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Just on that report on snow in Orange does anyone know what happened to Terry Bishop who was always on this list a few months ago telling us about the weather in Orange. Just curious. Dane Newman from a cold wet Kilsyth (Melbourne) current temp 7.5c at 10.00am
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014
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Date: Mon, 14 Jun 1999 10:03:03 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: Re: Cool season naders..(Adelaide)
Sender: aussie-weather-approval at world.std.com
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Yes I do recall this video on the news. Someone from SA has to get hold of
this person and see if they could get a copy of the video. Now there's a
thought.... Get that person to come along to one of your meetings. The
Bureau must know this person's name. and then look it up on the internet
Telstra phone book.
Jimmy Deguara
At 09:14 14/06/99 +0930, you wrote:
>Hi all on this cold morning.
>
>What a great start to winter! Hope I haven't put a hex on the rest of it.
>
>Conditions in Adelaide now much calmer after several o/night squalls,
>thunder and small hail. Haven't checked the official temps but my
>thermometer only went over 10 for a few minutes y'day in a short sunny
>break between squalls.
>
>I've been following the cold weather funnel thread with interest.
>Particularly liked Ira's contribution. I remember driving home from the
>Flinders Ranges in July (1995?). We were in the cold sector behind a
>front. It was a wild, very wet day in the northern Lofties, with
>occasional hail squalls at higher altitudes. That night on the news was a
>video of a cold air tornado a guy had taken about 100k north of Adelaide.
>Nice elephants trunk over a nearby ridge with very black turbulent cloud
>around. The worst thing was that I'd driven past this very spot less than
>an hour after he'd taken it! Do'wp!
>
>Phil 'Paisley' Bagust
>paisley at cobweb.com.au
>www.cobweb.com.au/~paisley
>
>
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> -----------------------jacob at iinet.net.au------------------------------
>
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
Australian Severe Weather Association home information page
http://www.severeweather.asn.au/
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015
From: "Phil Schubert" [philip at zedley.com]
To: [aussie-weather at world.std.com]
Subject: RE: aus-wx: Storms in Perth
Date: Mon, 14 Jun 1999 08:11:14 +0800
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Yes I watched from about 2.50 to 3.10 AM, but then had to shut off as the
lightning was too close, and didn't want to fry my computers.
There appeared to be two separate squall lines about 100km apart. We got a
lot more rain out of the second one. 30MM rain in the gauge this morning in
Noranda.
I am now off to work to count the damage. After every decent front we lose a
router or two through power/lighting. We can track the progress of a front
across the South West as the ISDN WAN links fail one by one. No need for
radar . No doubt the guy on call had a busy night last night.
Jacob Wrote
"Its currently 2:20am WST as I write this, quite a bit of lightning can be
seen to the west of Perth right now, the front is quite close to the coast
on the radar and should move through soon.
Jacob"
PS, I have a permanent connection through iinet, did you get any dropouts
during the storms.
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016
Date: Mon, 14 Jun 1999 10:22:54 +1000
From: Anthony Cornelius [cyclone at rmitel.com.au]
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Subject: Re: aus-wx: Electronic baro..
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi John,
Yep - I have one of them. About 3-4months ago I had the "battery low"
symbol on, however I changed the battery within 2 weeks....and I didn't
notice anything wrong with the readings....
Anthony
John Woodbridge wrote:
>
> Hi again Anthony,
>
> Guess what, I put new batteries in my electronic doodad, and the indicated
> barometric pressure immediately jumped 15hPa. Is that SUS or what???
> Humidity & temp readings apparently unaffected, but the baro is obviously
> highly dependent on battery voltage, to the point where it just about voids
> it's usefulness I would suggest.
>
> I went back over my readings to see if I could pinpoint the day when it
> started to go out of kilter, but it is not obvious, at least 2 weeks it
> would seem. The 'batt' warning indicator has been showing for around 2
> months, but I quietly ignored it as the unit seemed to be working just
> fine..... I think either you or James has one of these, so be warned....
>
> For others on the list, the doodad I'm referring to was purchased from an
> Australian Geographic store, it was a gift so I'm not sure of the price, I
> suspect in the vicinity of $200. It is a upright thin profile freestanding
> unit with a front panel LCD displaying temp, humidity, baro pressure, a 24
> hr baro histogram, & date/time. It carries no brandname other than 'made
> in china' and takes 4 x AAA batteries.
>
> John.
>
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017
X-Sender: cmaunder at mail.dynamite.com.au
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Date: Mon, 14 Jun 1999 10:33:53 +1000
To: aussie-weather at world.std.com
From: Chris Maunder [cmaunder at dynamite.com.au]
Subject: Re: aus-wx: Snow near Canberra
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
It's a balmy 6C in Canberra (10:30AM Monday). There is a lot of
cloud cover w/ sleet/snow over the hills nearby and we are getting
a lot of spray from it. Went for a drive and their was ice buildup
on the sides of the windscreens from the wipers.
Patrick - if you went XC skiing in the Brindebellas today then you
are mad!
At 22:03 13/06/99 , you wrote:
>I was in the Corin Forest area (alt approx 1200m) just south of
>Canberra this afternoon around 4.00pm. Wet snow was falling but
>not sticking.
>
>The temp in Canberra has been around 4 or 5 since the rain
>started this afternoon so there should be some nice white
>views on the higher ranges when visibility improves.
>
>I am tempted to try some X-C skiing tomorrow depending on what may
>fall tonight. Precipitation amounts don't seem to be that high
>in the mountains so far and I have only received 4mm at Higgins
>to 10.00pm. So it may be a little while yet before skiing is a
>possibility (other than on the main range which I anticipate to
>be somewhat antarctic tomorrow and I'm not that keen!!).
>
>Patrick
>
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com
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> -----------------------jacob at iinet.net.au------------------------------
>
------------------------------------------------------
Chris Maunder Canberra, Australia
Administrator CodeGuru - www.codeguru.com
Technical Consultant Dundas Software - www.dundas.com
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018
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Winds now Gale Force in Illawarra
Date: Mon, 14 Jun 1999 10:54:06 +1000
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10.50am Monday
Winds in the last 30 mins have lifted to Gale Force, up until then the best
was perhaps 20knots, now easily 30-40knots.
Sunny and about 13-14C, has to be 10C or lower on coast for snow in southern
highlands, and wind is too west, in fact still a little north of west, but
not much.
Michael Thompson
http://thunder.simplenet.com
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019
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Date: Mon, 14 Jun 1999 11:01:28 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: aus-wx: snow chasing
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I am aware that there are snow showers in the mtns but I also have work to
do. If someone feels they would like to do some snow chasing ie at night,
then indicate so. i will only go as far as the higher peaks near Lithgow or
Mt Tomah
Jimmy Deguara
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
Australian Severe Weather Association home information page
http://www.severeweather.asn.au/
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020
From: disarm at braenet.com.au
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Date: Mon, 14 Jun 1999 11:04:40 +1000
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Subject: aus-wx: wind warning for NSW
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WIND WARNING
BUREAU OF METEOROLOGY
NEW SOUTH WALES REGIONAL OFFICE
Issued at 0421 on Monday the 14th of June 1999
A low pressure system developing in the Tasman Sea off the NSW south coast
is expect to produce gale force northwest to westerly winds today in the
following districts :
Southern Tablelands
Central Tablelands
Northern Tablelands
South coast
Illawarra
Metropolitan
Hunter
Midnorth Coast [southern parts]
Winds are expected to reach 55 to 70 km/h in these areas today with gust of
up to 100 km/h possible. Winds are not expected to ease within the next 24
hours.
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021
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Date: Mon, 14 Jun 1999 11:59:13 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: Re: aus-wx: snow chasing
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Those in the Blue Mtns, can you tell me if there still is snow in the mtns
and if the Bells Line of Road is pretty packed with traffic later..
No doubt the cops will be on the prowl...
Jimmy Deguara
At 11:01 14/06/99 +1000, you wrote:
>I am aware that there are snow showers in the mtns but I also have work to
>do. If someone feels they would like to do some snow chasing ie at night,
>then indicate so. i will only go as far as the higher peaks near Lithgow or
>Mt Tomah
>
>Jimmy Deguara
>----------------------------------------------------------------------------
>---------------
>Jimmy Deguara
>Vice President ASWA
>from Schofields, Sydney
>e-mail: jimmyd at ozemail.com.au
>homepage with Michael Bath
>
>http://www.australiansevereweather.simplenet.com/
>
>Australian Severe Weather Association home information page
>
>http://www.severeweather.asn.au/
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>
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
Australian Severe Weather Association home information page
http://www.severeweather.asn.au/
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022
Date: Mon, 14 Jun 1999 12:22:29 +1000
From: Anthony Cornelius [cyclone at rmitel.com.au]
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Subject: Re: aus-wx: Winds now Gale Force in Illawarra
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Hi all,
Winds are now gale force in Belmont, Brisbane too...they've been strong
since about 5am this morning, frequent gusts above 30-33kn...nothing
much to report except the usual small branches/twigs/leaves coming off
trees during some of the gusts.
Temp is 18C, FP is -1C :-(
Anthony from Brisbane
Michael Thompson wrote:
>
> 10.50am Monday
>
> Winds in the last 30 mins have lifted to Gale Force, up until then the best
> was perhaps 20knots, now easily 30-40knots.
>
> Sunny and about 13-14C, has to be 10C or lower on coast for snow in southern
> highlands, and wind is too west, in fact still a little north of west, but
> not much.
>
> Michael Thompson
> http://thunder.simplenet.com
>
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023
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: snow chasing
Date: Mon, 14 Jun 1999 02:54:23 GMT
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On Mon, 14 Jun 1999 11:59:13 +1000, Jimmy Deguara
wrote:
>Those in the Blue Mtns, can you tell me if there still is snow in the mtns
>and if the Bells Line of Road is pretty packed with traffic later..
>
Jimmy, only a few flurries which (since noon) have turned to sleet.
All latest models keep it cold, however -- yesterday's MRF and last
nights AVN suggest 850 temps around -4 to -5 along the tablelands
until Wednesday, so I think it'll be cold enough for snow above 1000m
on the Blue Mtns for a few days yet, however only from late afternoon
to mid-morning as sun breaking through the incomplete CuSc cover warms
it up a bit by day.
The bigger question is how much precip -- the models would suggest
very little though the 700hPa relative humidity remains high in the
next few days, so windward slopes could get some reasonable depths.
Given the likely continued SW flow, the best snowdepths will probably
be on the ridge west of Lithgow and the high country S and SW of
Oberon -- bit far for a night drive.
The traffic on Bells usually quietens down around mid-evening on a
public holiday.
>No doubt the cops will be on the prowl...
>
The moreso if there's any suggestion of ice or snow.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
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024
Date: Mon, 14 Jun 1999 13:42:51 +1000
From: Anthony Cornelius [cyclone at rmitel.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Supercellular Movement
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Dean and Ira,
Firstly Ira...the storm splitting is a very interesting concept, it
happens here sometimes too...on October 13(98), as I have showed you the
radar (you might still have it) there's a HUGE mass of "strong messy
nothingness" WSW of Brisbane, from which two supercells occurred from,
(I believe that both of them are SC's...the BoM confirmed 3 on that day,
I'd be betting serious money there were double that on that day) they
both travelled NNE, almost parallel to each other, and then towards the
end of the sequence, they rejoin back into one cell! I thought this was
interesting...many of the other cells moved ENE to NE that day, but
there were over 20 single hailstorms in the 6hrs of Brisbane local
radar...ahh, this brings back memories :)
As for the Book Dean...it's a rather old one, I dug it up from the
depths of my uni library, it's called "severe and unusual weather" but
it's not a bad read.
Basically, it says if the cell is not rotating, then it will move with
it's prevailing winds (ie if the upper level winds are from the W, it'll
move E) This isn't always the case though, sometimes mid level winds
could extend a greater influence then upper level winds (especially if
the cell is not very high). However, rotation in the thunderstorm means
there's more winds then just updrafts and downdrafts...rotation means
some sort of horizontal winds too, and this is thought to effect how the
upper level winds interact with it...I thought it was fairly
interesting, as many supercell do in fact move differently to "normal"
thunderstorms.
Anthony Cornelius
Dean S wrote:
>
> Hey Anthony. Your theory on supercell storm structure is very real and
> possible. The double vortex is associated with the supercell and when
> the mid-level wind shear snaps, (as explained by Tony Bannastar at the
> BOM Severe Storms Section, Melbourne) causing two rotating, vertical
> vortexes, it is very possible for one to be responsible for a cyclonic
> updraught and a anti-cyclonic downdraught (U.S.). Or of course it could
> be the opposite. This is one of the best theories I've heard. Would you
> mind telling me where I can read this book/article? It would be great.
> Thanks.
>
> Deano
> Anthony Cornelius wrote:
> >
> > Hi all,
> >
> > I was reading something interesting last night, in regards to
> > supercellular movement. It's for the "double vortex" structure - one
> > with a "dual rotation," one vortex rotates clockwise, the other
> > anti-clockwise. It's for the US - but you could reverse the order in
> > what they say....and when you do, you get that if the clockwise rotation
> > is stronger, it induces thunderstorm movement to the left, and if the
> > anticlockwise rotation is stronger, it induces thunderstorm movement to
> > the right. This is for a westerly jetstream. The clockwise rotation is
> > your updraft, anti-clockwise is your downdraft.
> >
> > One interesting observation that always seems to be made with
> > supercells, is they move in a direction different then that to other
> > thunderstorms in the area. I was thinking that, in order for a
> > supercell to sustain itself, the updrafts would have to be equal to, or
> > greater than the downdrafts in order to sustain itself. So, if the
> > cyclonic updraft were stronger then the anti-cyclonic downdraft, then it
> > would indicate thunderstorm movement slightly to the left. Now - a lot
> > of storms in SE QLD/NE NSW move SW to NE, supercells tend to move NNE to
> > N'ly (and can sometimes propogate slightly W) - this is in line with the
> > explanation of the movement of supercells. The Sydney supercell also
> > took a NNE path, instead of a NE'ly path - another example.
> >
> > I'd be interested to see if anyone had any thoughts on this?
> >
> > Anthony Cornelius
> > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+> To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com
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> > -----------------------jacob at iinet.net.au------------------------------
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025
X-Sender: jimmyd at pop.ozemail.com.au
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Date: Mon, 14 Jun 1999 14:26:29 +1000
To: aussie-weather at world.std.com
From: Jimmy Deguara [jimmyd at ozemail.com.au]
Subject: aus-wx: radar and low cloud
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hi Jimmy here,
Taking into account the distance, possible obstructions of mountains and
the fact that the cloudsmtoday are relatively low, the radar is only
picking out a few of the showers on the mtns. I believe from observations
there is quite a bit more in terms of showers. It may only be picking up
the more heavier showers.
On a different note, there are quite a few on the list who have not spoken
for a little while and I know that some are interested in the snow etc. I
hope when they get back to normal over the next few days that they can
contribute their observations of snow as I know some would have gone to the
Snowy Mtns and Tim Crugeon on the Barrington Tops as he normally does. I
would say snow is prevelant there at the moment.
Cold Jimmy Deguara
----------------------------------------------------------------------------
---------------
Jimmy Deguara
Vice President ASWA
from Schofields, Sydney
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
Australian Severe Weather Association home information page
http://www.severeweather.asn.au/
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026
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Date: Mon, 14 Jun 1999 13:41:18 +0800
To: aussie-weather at world.std.com
From: Jacob [jacob at iinet.net.au]
Subject: RE: aus-wx: Storms in Perth
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Yes, I had to do the same, lucky I did, because about 5 mins later we had a
power surge, which also took the street lights off for about 10 mins or so.
Like you say another line of storms moved through at around 4:30am or so.
I was impressed with the amount of lightning we had for such a weakish cold
front, it didnt even get under 1010hPa in Perth.
Jacob
At 08:11 14/06/99 +0800, you wrote:
>Yes I watched from about 2.50 to 3.10 AM, but then had to shut off as the
>lightning was too close, and didn't want to fry my computers.
>
>There appeared to be two separate squall lines about 100km apart. We got a
>lot more rain out of the second one. 30MM rain in the gauge this morning in
>Noranda.
>
>I am now off to work to count the damage. After every decent front we lose a
>router or two through power/lighting. We can track the progress of a front
>across the South West as the ISDN WAN links fail one by one. No need for
>radar . No doubt the guy on call had a busy night last night.
>
>Jacob Wrote
>
>"Its currently 2:20am WST as I write this, quite a bit of lightning can be
>seen to the west of Perth right now, the front is quite close to the coast
>on the radar and should move through soon.
>
>Jacob"
>
>PS, I have a permanent connection through iinet, did you get any dropouts
>during the storms.
>
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> -----------------------jacob at iinet.net.au------------------------------
>
>
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027
From: "Jane ONeill" [cadence at rubix.net.au]
To: "Aussie Weather" [aussie-weather at world.std.com]
Subject: aus-wx: Melbourne sea to mountains chase
Date: Mon, 14 Jun 1999 16:09:57 +1000
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Andrew & Claire McDonald, Chris Gribben & I met in the carpark of the
Beaumaris Yacht Club at some ungodly hour this morning to await developments
(and waterspouts - even though we had strong suspicions that the setup was
completely wrong : ie: NW winds shifting W-SW after 10am). Sighted 1
(possible) vapour vortex and some soft hail .......then off to Mt Donna
Buang - 1250m in the Yarra Valley - 6-10cm snow on the ground, frozen trees
and still snowing steadily when we arrived just after 1pm. Snowflakes still
falling to 900m on the way down.
1 out of 2 isn't bad .
Round trip approx 250km
Jane
============================================================
Jane ONeill Bayswater Melbourne cadence at rubix.net.au
http://www.rubix.net.au/~cadence
http://www.severeweather.asn.au/
============================================================
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028
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Date: Mon, 14 Jun 1999 15:54:06 +0930
To: aussie-weather at world.std.com
From: Phil Bagust [paisley at cobweb.com.au]
Subject: Re: aus-wx: Cold air anvil
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Just had a gorgeous coldy slide by a few km to my south. Got some nice
chilly outflow for 4 or 5 minutes. Took some piccies of some interesting
base structure. I'd say for you lucky souls in the east - the best is yet
to come...
Phil 'Paisley' Bagust
paisley at cobweb.com.au
www.cobweb.com.au/~paisley
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029
Date: Mon, 14 Jun 1999 14:04:04 -0700
From: Lindsay [writer at lisp.com.au]
X-Mailer: Mozilla 3.0 (Win16; I)
To: aussie-weather at world.std.com
Subject: aus-wx: Snow
Sender: aussie-weather-approval at world.std.com
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Well, what a day in Oberon and South of Oberon today, Monday the 14th.
For those unaware of its whereabouts, Oberon is on the Central
Tablelands and about three hours from Sydney with altitude reaching near
1400 metres south of the town - at Shooters Hill.
Inches and inches of fallling snow in the township itself and huge dumps
near shooters hill. I drove up there, after locals advised me not to, in
my trusty old Corona and almost made it to Shooters Hill before the car
lost traction and slid into a shallow ditch (a four wheel drive lost it
and totally got bogged nearby, I was lucky) I've got picks of my car's
slide/skid marks and all.
The snow on the road was too high for the car to drive over in the end
so I had to drive back (after heaps of photos) as the snow got really
heavy.
I've gots 25 or more photos so when I process them and get them put on
to disk, I will try and send some to the appropriate folk so we all can
see them.
Sure, there was more snow on the Alps but to see this much snow on the
Central Tablelands was just great. I really should leave the pictures to
tell the story so as not to exaggerate the situation but I have macro
shots of snow close to me knees in depth, if i remember correctly.
Total white out in the surrounding landscape and thick snow, at least
for here. There was inches and inches of snow piled on cars and roads
were very icy and snowy. But...I'll let the photos do the rest of the
talking, when I eventually get them processed.
Very little snow here in Blackheath with just flurries now and then.
Cold though, we had a max of around two today, Oberon maybe a degree or
three colder. The snow there was driving and pea size there.
Until the photos,
Cya later,
Lindsay Pearce
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030
From: "Marty" [martyp at dynamite.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Re: Cool season naders..
Date: Mon, 14 Jun 1999 18:45:18 +1000
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Hi Paul,
It seems you have erroneously sent an email to me that was intended for Ben.
Cheers,
Marty.
Brisbane, Australia
martyp at dynamite.com.au
Images of Canberra: http://www2.dynamite.com.au/martyp
Lightning Photos: http://www2.dynamite.com.au/martyp/lightning
ICQ: 11790565
-----Original Message-----
From: Paul Graham [v_notch at hotmail.com]
To: bodie at flatrate.net.au [bodie at flatrate.net.au]
Cc: aussie-weather at world.std.com
Date: Monday, 14 June 1999 0:46
Subject: aus-wx: Re: Cool season naders..
>Hi Ben,
>As I understand, these types of tornadoes occur in cold, post-frontal
>environments with negative, low-level (up to about 700Hpa) LI's and strong
>low-level shear (usually just after the front). I believe the orientation
>of the coastline can also play a role. They are most common in the SW of WA
>and in parts of SA and Victoria and are mostly fairly weak - in the order of
>f0 intensity on the Fuijita scale.
>To me, the situation today looked favourable with a very cold unstable SW
>airstream and embedded thunderstorms just behind the front. Since the
>Bureau doesn't have an official tornado warning product for SA (probably no
>need), I was a bit suspicious of the warning that was issued (the Severe
>Weather Advice) today. I thought that perhaps the forecasters at the Bureau
>may have been thinking of the risk of these tornadoes when issuing the
>warning. For more information regarding the environments most conducive to
>these types of tornadoes, just have a look at the Bureau's site:
>http://www.bom.gov.au/bmrc/regn/expt/tornado/SA/coldies_sa.htm
>
>With regard to hailsize and the wetbulb zero temperature, I am not too sure.
> I think it may be due to the fact that hail favours temperatures greater
>than about -5c due to the shapes of the ice crystals at these temperatures -
>helps in aggregation (information obtained from "The Weather and Climate of
>Australia and New Zealand" [Sturnam and Tapper]). The lower the WBZ height,
>the lower the temperature of the cloud and the less likely hail will grow.
>This is a just a suggestion.
>- Paul G.
>
>>From: Ben Quinn
>>To: v_notch at hotmail.com
>>Subject: Cool season naders..
>>Date: Sun, 13 Jun 1999 17:32:16 +1000
>>
>>Hey Paul, Ben here..
>>
>>Just read your message to the list saying that you though their could be
>>some "cool season naders in VIC and SA" today.. and i was just wondering
>>what you would class as the right conditions for this? This topic has
>>come up in IRC quite a few times, and becomes quite heated at times
>>because people seem to have different opinions of what the right
>>conditions are.. I would love to hear any thoughts you have on the
>>topic..
>>
>>Also, i'm sure that you are familiar with the wet bulb zero indicie on
>>an atmospheric sounding .. the information that i have on it on my
>>soundings page states that rapidly decreasing hail size is likely for a
>>wetbulb under 6000-5000 feet, and rapidly decreasing hail size for a
>>wetbulb in excess of 11000 feet.. the 11000 feet i can comprehend.. but
>>the under 5000 feet i'm am not 100% sure of.. can you offer an
>>explanation for this?
>>
>>My thoughts are that if the wetbulb is too low, then the cloud is all
>>ice.. and if there's too much ice and not enough liquid water then the
>>water will not accumulate on the hail?
>
>
>______________________________________________________
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> -----------------------jacob at iinet.net.au------------------------------
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031
X-Originating-Ip: [203.2.193.71]
From: Patrick Tobin [pdtobin at hotmail.com]
To: aussie-weather at world.std.com
Subject: Re: aus-wx: Snow near Canberra
Date: Mon, 14 Jun 1999 02:19:09 PDT
Sender: aussie-weather-approval at world.std.com
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>Patrick - if you went XC skiing in the Brindebellas today then you
>are mad!
Hmm.. discretion being the better part of valour I wimped out and
left the higher ranges to themselves today. Did go up to Corin
Forest and landed some very effective snow ball hits against a
couple of people!! About 6-10cm on the ground at Corin.
Also got snowed on at Gibraltar rocks at Tidbinbilla - the mountains
behind Tidbinbilla are very white (they go up to around 1500-1600m
from memory so there will be a lot of white visible from Canberra
when visibility improves.
Current (7.00pm) temp of 3.5 in Higgins with continuing cloud and wind
suggest that a few flakes may be sighted in some Canberra suburbs 1st thing
tomorrow morning.
As Jimmy observed the radar does not do a very good job of picking
up precipitation from low level cloud. I have noticed that in
cold outbreaks the cloud pattern is quite different to what I
was used to in Melbourne/southern Vic. In Victoria the cloud tops
of the passing cells would get to around 5000m with good anvil and
cellular development (the radar picks these up).
In the same airstream passsing over the ranges of southern NSW
there is often a continuous glaciated cu/sc cover over the ranges with
precipitation also falling continuously.
As you move east away from the ranges, the cloud and precipitation becomes
more scattered and intermittent (ie the Canberra region) before dissipating
entirely on decending the coastal escarpment as
would be expected.
What intrigues me though is that the cloud tops seem not to get
above around 2000-3000m even after the land has been heated by the sun
during the day.
I presume this is caused by the forcing of the air mass between
the tops of the ranges and a rapidly stabilising middle atmosphere
resulting in very strong winds. I notice the inversion at around
the 780mb level (about 1950m) in today's Wagga soundings above
which the air gradually becomes more stable until it is completely
capped at around 530mb (about 5000m).
In such circumstances presumably any day time heating would be
pretty irrelevant and would be unlikely to result in individual
cells forming and rising to the levels expected in southern Vic
(and coastal SA).
Just some idle musings (or the output of a hypothermic brain!!)
Patrick
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032
Date: Mon, 14 Jun 1999 20:08:46 +1000
From: Chas & Helen Osborn [hosborn at tassie.net.au]
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Subject: aus-wx: Composite World Satellite Image
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Hello Everyone
Intellicast have changed their web page. Unfortunately they have decided not to include their Colour Composite World Satellite Image. Does anyone have a site of equal quality?
This was the URL
http://www.intellicast.com/weather/intl/worldsat/
Chas
Launceston (For the next couple of weeks) Tasmania
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033
From: "Jane ONeill" [cadence at rubix.net.au]
To: "Aussie Weather" [aussie-weather at world.std.com]
Subject: aus-wx: MSC updates
Date: Mon, 14 Jun 1999 20:38:11 +1000
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This weekend's updates include:
Photos of 3.5 new members of ASWA Victoria
http://www.rubix.net.au/~cadence/mug_shots.htm
Geelong storm photos for 19th May 1999 (report coming)
http://www.rubix.net.au/~cadence/19_5_99.htm
Photos of part 1 of today's Sea to the Mountains chase (report coming)
http://www.rubix.net.au/~cadence/14_6_99.htm
Jane ONeill
============================================================
Jane ONeill Bayswater Melbourne cadence at rubix.net.au
http://www.rubix.net.au/~cadence
http://www.severeweather.asn.au/
============================================================
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034
X-Sender: mbath at pop.ozemail.com.au
X-Mailer: QUALCOMM Windows Eudora Pro Version 4.1
Date: Mon, 14 Jun 1999 20:48:16 +1000
To: aussie-weather at world.std.com
From: Michael Bath [mbath at ozemail.com.au]
Subject: Re: aus-wx: Composite World Satellite Image
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Chas,
Check the links from out satpic page:
http://australiansevereweather.simplenet.com/links/ozsatpic.htm
Under the 'NASA/MFSC GHCC' heading, there is a link to a global IR mosaic
(though the site is not responding as I write this...8.48pm)
regards, Michael
At 20:08 14/06/99 +1000, you wrote:
>
> Hello Everyone
>
> Intellicast have changed their web page. Unfortunately they have decided not
> to include their Colour Composite World Satellite Image. Does anyone have a
> site of equal quality?
>
> This was the URL
>
>
| Document: 990614.htm
Updated: 27 June 1999 |
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