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Storm News
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Australian Weather Mailing List Archives: 13th December 1998 |
From Subject
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001 "Jimmy Deguara" [jimmyd at ozemail.com.au] Chasing and storm situation
002 "Jimmy Deguara" [jimmyd at ozemail.com.au] chase
003 "Patrick Tobin" [pdtobin at hotmail.com] Re Chasing and storm situation
004 "Michael Thompson" [michaelt at ozemail.com.au] chase
005 wbc at ozemail.com.au (Laurier Williams) Radar Report -- Sydney 15.00edst
006 Paul Graham [pgraham1 at mail.usyd.edu.au] Severe Thunderstorm Warning...
007 Paul Graham [pgraham1 at mail.usyd.edu.au] Storms Approaching...
008 Paul Graham [pgraham1 at mail.usyd.edu.au] Severe Thunderstorm Update...
009 Paul Graham [pgraham1 at mail.usyd.edu.au] Storms Update...
010 wbc at ozemail.com.au (Laurier Williams) Radar Report -- Sydney 16.20edst
011 wbc at ozemail.com.au (Laurier Williams) Remarkable Giles radar images
012 Paul Graham [pgraham1 at mail.usyd.edu.au] Remarkable Giles radar images
013 Paul Graham [pgraham1 at mail.usyd.edu.au] Remarkable Giles radar images
014 "Jimmy Deguara" [jimmyd at ozemail.com.au] Chase report Lithgow 13th December 1998
015 Paul Graham [pgraham1 at mail.usyd.edu.au] TV Documentary..
016 "Ben Quinn" [Bodie at corplink.com.au] Article in Paper
017 "James Chambers" [jamestorm at ozemail.com.au] Thelma coming back
018 Anthony Cornelius [cyclone at stealth.com.au] El Nino vs Solar Magnetism - linked?
019 Sam Barricklow [k5kj at pulse.net] Lightning Images
020 "Michael Thompson" [michaelt at ozemail.com.au] Bust chase / cruel storms
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001
From: "Jimmy Deguara" [jimmyd at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aussie-weather: Chasing and storm situation
Date: Sun, 13 Dec 1998 08:46:32 +1100
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It looks as though today will be similar to the past few days. There seems
to be no wind right through the atmosphere. More like another mtns day..
----------------------------------------------------------------------------
---------------
Jimmy Deguara from Schofields
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
--------------------------------------------------------------------------------------
002
From: "Jimmy Deguara" [jimmyd at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aussie-weather: chase
Date: Sun, 13 Dec 1998 09:18:39 +1100
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If you wish to contact Michael and Jimmy, we are heading towards Lithgow at
this stage.
To contact us, 0412253109 mobile
See you all later
----------------------------------------------------------------------------
---------------
Jimmy Deguara from Schofields
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
--------------------------------------------------------------------------------------
003
X-Originating-Ip: [202.12.90.132]
From: "Patrick Tobin" [pdtobin at hotmail.com]
To: aussie-weather at world.std.com
Subject: aussie-weather: Re Chasing and storm situation
Date: Sat, 12 Dec 1998 16:02:21 PST
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Was awoken at 0030 AEDT this morning in Canberra by a passing storm.
Lots of CG's and loud noise (about 1 stroke per min for about 10-15min)
but no precipitation at my place.
Yesterday, after the late morning looked promising, dry air again
limited development (DP falling to about 8 in the afternoon). Towards
evening there were quite a few Cb's around but all seemed to have very
high bases (looked to be over 3km) with most precipitation evaporating
before reaching the ground. Some spectacular storms to be seen closer to
the coast (with presumably greater moisture supply). Inland I did notice
some very high anvils from the single cell storms that did develop.
Today looks similar to the last few days although am wary of the high
cloud that is gradually edging in from the SW. Given the moisture
constraints of the last week, we might get some more interesting
activity once an easterly component develops later today or tomorrow.
Current Canberra temp at 10.55 AEDT is 29.5 with DP of 13.
Patrick
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004
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aussie-weather: chase
Date: Sun, 13 Dec 1998 13:16:56 +1100
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Situation to far SW seems more promising, very tall congestus and some
middle layer stuff, also some congestus is spreading out to strato-cumulus,
a good sign of a slight capping. To the west looks exactly like yesterday,
that is Cu over mountains, I am going to watch radar as I think Nowra may be
one later today.
Michael
-----Original Message-----
>From: Jimmy Deguara
>To: aussie-weather at world.std.com
>Date: Sunday, 13 December 1998 9:19
>Subject: aussie-weather: chase
>
>
>If you wish to contact Michael and Jimmy, we are heading towards Lithgow at
>this stage.
>
>To contact us, 0412253109 mobile
>
>See you all later
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005
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: aussie-weather: Radar Report -- Sydney 15.00edst
Date: Sun, 13 Dec 1998 04:17:29 GMT
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Line of rapidly developing storms roughly Mittagong -- Katoomba --
30km N of Lithgow; second line lying from Oberon to the SE. Large area
40>100mm/hr with some >100 in Hilltop/Thirlmere area, smaller areas
around Bell to north of Wentworth Falls.
Here at Blackheath (at 15.10edst) it's very black to the east, and I'm
getting occasional fairly close thunder between N and S via E.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
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006
Date: Sun, 13 Dec 1998 15:31:48 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: Severe Thunderstorm Warning...
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IDW10N00
TOP PRIORITY FOR IMMEDIATE BROADCAST
SEVERE THUNDERSTORM WARNING
BUREAU OF METEOROLOGY
NEW SOUTH WALES REGIONAL OFFICE Issued at 1452 on Sunday the 13th of
December 1998
This warning affects people in the in the following Local Government
Areas:
Wollondilly.
This warning is current from 250 pm until 4 pm.
Storms are currently located near Picton and are forecast to move very
slowly towards the east
Large hailstones, destructive winds and very heavy rainfall are possible.
The STATE EMERGENCY SERVICE advises that as storms approach people should:
* put vehicles under cover or cover them with blankets
* move indoors away from windows
During and after storms, people should:
* take extreme care when driving
* beware of fallen trees and power lines
* keep away from creeks and drains as you may be swept away
If your house is damaged contact your local State Emergency Service,
listed
under "S" in the White Pages, for emergency assistance. Don't use the
telephone during the storm.
TV CRAWL: Severe Thunderstorm Warning current for Wollondilly
NOT FOR BROADCAST: This warning will be updated within the next hour. The
Bureau and SES would appreciate it being broadcast regularly during this
period.
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
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007
Date: Sun, 13 Dec 1998 15:56:34 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: Storms Approaching...
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The storms to the west are approaching very slowly... The anvil is now
beginning to block out the sun.
- Paul G.
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
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008
Date: Sun, 13 Dec 1998 16:04:16 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: Severe Thunderstorm Update...
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IDW10N02
TOP PRIORITY FOR IMMEDIATE BROADCAST
SEVERE THUNDERSTORM WARNING
BUREAU OF METEOROLOGY
NEW SOUTH WALES REGIONAL OFFICE Issued at 1554 on Sunday the 13th of
December 1998
This warning affects people in the following Local Government Areas:
Wingecarribee, Wollondilly, Blue Mountains and western Sydney
Metropolitan [west of line Richmond to Campbelltown].
This warning is current from 4:00 pm until 5:00 pm
Thunderstorms are currently located in the above areas and are forecast to
move slowly.
Large hailstones, destructive winds and very heavy rainfall are possible.
The STATE EMERGENCY SERVICE advises that as storms approach people should:
* put vehicles under cover or cover them with blankets
* move indoors away from windows
During and after storms, people should:
* take extreme care when driving
* beware of fallen trees and power lines
* keep away from creeks and drains as you may be swept away
If your house is damaged contact your local State Emergency Service,
listed
under "S" in the White Pages, for emergency assistance. Don't use the
telephone during the storm.
TV CRAWL: Severe Thunderstorm Warning current for western Sydney, and the
Wingecarribee, Wollondilly and Blue Mountains LGA's
NOT FOR BROADCAST: This warning will be updated within the next hour. The
Bureau and SES would appreciate it being broadcast regularly during this
period.]
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
--------------------------------------------------------------------------------------
009
Date: Sun, 13 Dec 1998 16:07:34 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: Storms Update...
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Just watching out the window here - can see the sky darkened to the west -
intense static crackles on the AM radio....
Anyone with more info.?
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
--------------------------------------------------------------------------------------
010
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: aussie-weather: Radar Report -- Sydney 16.20edst
Date: Sun, 13 Dec 1998 05:50:23 GMT
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An almost perfect circle of of 10>20mm/hr rain bounded Lithgow,
Katoomba and Richmond, and completing the circle to the north, with an
area 40>100 and some >100 from around Richmond to west of Penrith at
16.20edst -- any hail?. The images from 15.40 onwards show this area
of very heavy rain developing over around Wentworth Falls and moving
east then northeast. At Blackheath I had 12.4mm from 15.53 to 16.21 in
mostly heavy large spotted rain; no hail, tho Jimmy and Michael, who
are chasing, had a report of hail near Bell -- they'll no doubt report
when they get back.
There are still heavy echoes north of Lithgow, south of Oberon and
west from Bowral, though the Bowral system(s) seem to be decaying.
Update at 16.40:
Still a rough circle as described above, but heaviest concentration
now about 50km north of Richmond. Large area 10>40mm/hr with some
40>100 in line west of Richmond to west of Penrith; and some heavy
rain still lingering about 30km west of Bowral.
SEVERE THUNDERSTORM ADVICE
BUREAU OF METEOROLOGY
NEW SOUTH WALES REGIONAL OFFICE
Issued at 1616 on Sunday the 13th of December 1998
This advice affects people in the following weather districts:
Central Tablelands and the Hunter, west of line Wiseman's Ferry,
Muswellbrook, Murrurundi.
Thunderstorms are forecast within the advice area from 4 pm until 8
pm.
Some of these are expected to be severe, bringing large hailstones,
destructive winds and very heavy rainfall.
---------and------------
TOP PRIORITY FOR IMMEDIATE BROADCAST
SEVERE THUNDERSTORM WARNING
BUREAU OF METEOROLOGY
NEW SOUTH WALES REGIONAL OFFICE Issued at 1554 on Sunday the 13th of
December 1998
This warning affects people in the following Local Government Areas:
Wingecarribee, Wollondilly, Blue Mountains and western Sydney
Metropolitan [west of line Richmond to Campbelltown].
This warning is current from 4:00 pm until 5:00 pm
Thunderstorms are currently located in the above areas and are
forecast to
move slowly.
Large hailstones, destructive winds and very heavy rainfall are
possible.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
--------------------------------------------------------------------------------------
011
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: aussie-weather: Remarkable Giles radar images
Date: Sun, 13 Dec 1998 07:54:43 GMT
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Some remarkable radar images from the Giles radar at the moment -- I
haven't seen anything quite like them. Have a look at them at
http://www.lisp.com.au/~laurier/aussie-weather/ and tell me what you
think. If in fact they are thunderstorms, I hope one goes over a
raingauge somewhere...... Duststorms perhaps???
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
--------------------------------------------------------------------------------------
012
Date: Sun, 13 Dec 1998 19:42:56 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: aussie-weather at world.std.com
Subject: Re: aussie-weather: Remarkable Giles radar images
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Hi Laurier and everyone,
It may be a case of tropospheric ducting?? This occurs in stable high
pressure regions when there is a strong temperature inversion and
generally affects UHF frequencies and higher. In such cases I think you
can get backscattering which may account for the radar echoes... Any
other ideas?? BTW. As from tomorrow I may not be able to download my
e-mail because my dial-up access expires. You can still send mail to my
account on marconi but I may not be able to respond until I have organised
a new dial-up account. Cheers,
Paul G.
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
On Sun, 13 Dec 1998, Laurier Williams wrote:
> Some remarkable radar images from the Giles radar at the moment -- I
> haven't seen anything quite like them. Have a look at them at
> http://www.lisp.com.au/~laurier/aussie-weather/ and tell me what you
> think. If in fact they are thunderstorms, I hope one goes over a
> raingauge somewhere...... Duststorms perhaps???
>
>
> --
> Laurier Williams
--------------------------------------------------------------------------------------
013
Date: Sun, 13 Dec 1998 19:47:23 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: aussie-weather at world.std.com
Subject: Re: aussie-weather: Remarkable Giles radar images
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Actually, I've had second thoughts, I am not sure whether tropospheric
ducting in combination with backscattering would create such storng
echoes. If you have a look at the sat. pic. you'll see thunderstorms in
the area so they were probably just heavy storms...
- Paul G.
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
On Sun, 13 Dec 1998, Paul Graham wrote:
> Hi Laurier and everyone,
> It may be a case of tropospheric ducting?? This occurs in stable high
> pressure regions when there is a strong temperature inversion and
> generally affects UHF frequencies and higher. In such cases I think you
> can get backscattering which may account for the radar echoes... Any
> other ideas?? BTW. As from tomorrow I may not be able to download my
> e-mail because my dial-up access expires. You can still send mail to my
> account on marconi but I may not be able to respond until I have organised
> a new dial-up account. Cheers,
> Paul G.
--------------------------------------------------------------------------------------
014
From: "Jimmy Deguara" [jimmyd at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aussie-weather: Chase report Lithgow 13th December 1998
Date: Sun, 13 Dec 1998 20:12:16 +1100
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Sorry about the repeat message. Wrong subject
Michael and I got back from a long days chasing. We had planned to go out
early and did arriving at Lithgow around 11:15am. We had castellanus
developing into cumulonimbus within an hour and this continued. By 12:00pm,
the large cu began to grow and within an hour was spreading an anvil. It had
a flanking line which we hoped would eventually come our way. After an hour
waiting in a new spot south of Lithgow (getting sunburnt) although we got
some nice shots and video of its structure, we decided to head back to
Lithgow refuel and chase up the Bells Line Road. Things happened very
quickly around there since as we ascended, there were dark cloud bases with
nice green tinge affects. Unfortunately, we headed straight through and
didn't get the hail. Had we stayed on the side of the road on the top of the
rise, we would have got something. We had planned to go towards the more
intense stage of the precipitation cascade and were within 2km of severe
hail and took cover. We were hoping it would drift upon us but all we got
was heavy rain.
There were cu all around in the morning although they seemed to not grow
until this evening. As usual, you can never get into the areas where storms
develop. I hope someone chased the area around Camden...
On the way back, we noticed that north Richmond indicated that a severe
storm had been in the area with leaves and debri on the road (probably hail)
and some items blown down.
It was an interesting chase. The decision was to either go to Lithgow or
towards Singleton. It seems both regions got severe weather so I am glad it
wasn't a bust. We will eventually get the pics when they get developed.
It seems like Monday and especially Tuesday will produce some good storms.
People who have time off better get themsleves organised before so that they
can chase in the regions with the lowest LI (Lifted Index) as well as
moisture dry air boundaries. At this stage, it is expected to the NW of
Sydney around Mudge to Orange area for Tuesday. I would chase if I could
take a day off. We'll see....
----------------------------------------------------------------------------
---------------
Jimmy Deguara from Schofields
e-mail: jimmyd at ozemail.com.au
homepage with Michael Bath
http://www.australiansevereweather.simplenet.com/
--------------------------------------------------------------------------------------
015
Date: Sun, 13 Dec 1998 20:28:44 +1100 (EST)
From: Paul Graham [pgraham1 at mail.usyd.edu.au]
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: TV Documentary..
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Hi everyone,
This is a reminder: tomorrow morning the ABC will be replaying the
new series from EMA about Natural Hazards. One of the episodes will be on
severe storms and there are others on cyclones, floods, bushfires etc...
Set your VCR's...I think it will be on at 7am or 7:15am - not
sure...
- Paul G.
----------------------------
Paul Graham
paul at marconi.mpce.mq.edu.au
----------------------------
--------------------------------------------------------------------------------------
016
From: "Ben Quinn" [Bodie at corplink.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aussie-weather: Article in Paper
Date: Sun, 13 Dec 1998 20:39:30 +1100
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There was *yet another* article in todays Sunday Mail in Brisbane wich i
found interesting:
(TITLE: Huge cyclones on way)
Queensland faces a battering by intense cyclones next month, research shows.
Cyclone Thelma, whose 300km/h winds battered northern Australia during the
past week, is a prelude of things to come, the Queensland Centre for Climate
Applications says.
It predicts high rainfall in coastal areas and says cyclonic activity is
five times more likely than last January. QCCA manager Greg Jones yesterday
warned north Queensland farmers to prepare for a very active cyclone season
and very heavy rainfall.
The Southern Oscillation Index, used to predict weather patterns, indicated
cyclones would be "very active" earlier in the season. The SOI was in a
positive phase, indicating a higher chance of an extreme wet season and
intense cyclone activity.
--------------------------------------------------------------------------------------
017
From: "James Chambers" [jamestorm at ozemail.com.au]
To: "Aussie Weather" [aussie-weather at world.std.com]
Subject: aussie-weather: Thelma coming back
Date: Sun, 13 Dec 1998 21:02:39 +1000
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PRIORITY
TROPICAL CYCLONE ADVICE NUMBER 47
BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING CENTRE PERTH
ISSUED AT 7.00 PM ON SUNDAY 13/12/1998
=====
A WARNING for a CATEGORY 1 CYCLONE is now current for coastal areas
between LA GRANGE (BIDYADANGA) and PORT HEDLAND.
A CYCLONE WATCH extends west to MARDIE
At 6.00 PM this evening ex-tropical cyclone Thelma was
estimated to be 110 kilometres southsouthwest of Broome,
25 kilometres south of La Grange and 370 kilometres eastnortheast of
Port Hedland and moving westsouthwest at 9 kilometres per hour.
Ex-cyclone Thelma is expected to move offshore this evening and
re-intensify to tropical cyclone strength tomorrow.
Gales with gusts to 100 kilometres per hour may develop on the coast
between La Grange and Pardoo tomorrow morning and extend to Port
Hedland during the afternoon or evening.
Details of Ex-tropical cyclone Thelma at 6 PM.
Location of centre within 50 kilometres of
Latitude 18.9 South Longitude 121.8 East
Recent movement Westsouthwest at 9 kilometres per hour
Central pressure 996 hectopascals=====
The next warning will be issued at 10 PM.
------------------------------------------------------
James Chambers
http://www.ozemail.com.au/~jamestorm/bristorm.html
--------------------------------------------------------------------------------------
018
Date: Sun, 13 Dec 1998 21:05:38 +1000
From: Anthony Cornelius [cyclone at stealth.com.au]
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To: Australian Weather Mailing List [aussie-weather at world.std.com]
"undernet-weather at world.std.com"
Subject: aussie-weather: El Nino vs Solar Magnetism - linked?
Sender: aussie-weather-approval at world.std.com
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Hi all,
I read a very interesting article in "Weird Weather" by Paul Simons
about solar magnetism, I'll underline the most 'important' section.
It reads... Joe King of the Appleton Laboratory noticed that the
contour lines in the Earth's magnetic field bear a striking resemblance
to isorbars on the map of atmospheric pressure drawn around the true
north pole. He suggests that the two are actually linked, and this is
why the circumpolar flow of westerly wind, which dominates temperate
weather, is sensitive to solar activity. Whenever there are sunspots,
there is a magenetic distrubance in our atmosphere, a strengthening of
the Earth's field, and a tendency for severe wind storms to break out
over sea. When the sun is quiet and our field is correspondingly weak
the winds do seem to drop, producing calmer weather everywhere.
Goesta Wollin at Columbia Obvervatory in Palisades, New York, found
twenty years ago that in past eocks whenever the Earth's magnetic field
was weaker, the planet was warmer. He examined magnetic records from
more than forty obvervatories around the world and it was very clear
that in places where the intensity of the magnetic field had fallen it
was followed by warmer average yearly temperatures, whereasan increase
in magnetic field led to a drop in temperature. He then looked at how
the Earth's field changes wover months and years, and these too matched
the changing weather.
What's important is not neccessarily the strength of the field, but how
fast it changes. Wollin proposed that the salf water on the oceans is
behaving like a gigantic dyamo with the Earth's magnetic field. As salt
water is good at conducting electricity, the great ocean currents
flowing around the world generate a massive electric current like a
dynamo. And when the Eath's magnetic field changes it affects the speed
of the ocean currents. This then alters the vast distribution of heat
around the globe and that changes the climate.
Perhaps this is how Hayden Walker, a long-range forecaster who forecasts
via sunspots works? And perhaps, this is how El Nino's and La Nina's
occur with the changes in the ocean current? I just thought it was very
interesting, and got the old 286 processor working (aka my brain)
Anthony
--------------------------------------------------------------------------------------
019
Date: Sun, 13 Dec 1998 06:31:55 -0600
From: Sam Barricklow [k5kj at pulse.net]
Organization: SKYWARN
X-Mailer: Mozilla 4.04 [en] (Win95; U)
To: Aussie Weather [aussie-weather at world.std.com]
Subject: aussie-weather: Lightning Images
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
For anyone who is interested:
Hi all,
Last summer was an odd monsoon season for us. Our daily storms
developed,
but they often dispersed without producing any photographically
desirable
bolts. It seems as though we set up on several dozen storms that
should
have been awesome, only to go home having photographed a great sunset.
While it is not uncommon for our storms to propagate and dissipate
rapidly,
this summers weather was definitely a change from past seasons. Many of
our historically productive tracks yielded very few images.
The smoke from Mexico was also a small factor in location selection. We
had a three week period that was moderately smokey, although I have been
told that we had nothing to complain about here in Tucson.
The season was not a total bust, of course, and I have just posted 60
new
photos to our site. Most of them are from this summer. You can find us
at:
http://strikingimages.com
I am scanning another 120 to be posted soon.
We have also added our new screen savers to the site.
I look forward to your comments.
And remember: flash.........bang, good - FLASHBANG, bad!
Nick Wantland
--------------------------------------------------------------------------------------
020
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aussie-weather: Bust chase / cruel storms
Date: Sun, 13 Dec 1998 23:52:31 +1100
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The need for upper winds was demonstrated again yet today. I chased to the
Camden / Picton area that had a severe warning out, but within the 50 min
drive from Wollongong the storm had killed itself, I passed under a lovely
gust front about 10 kms from Wilton and thought I was in for treat, that is
until the western horizon became visible, what a pathetic sight, masses of
anvil, but no fresh development and broken sky to west. The development had
moved further NW, I drove to Camden but decided that I had had enough and
headed home.
Without upper winds you get two things, firstly the downdraft kills the
updraft, thus killing the cell, you can of course get development further
away on the outflow boundary. Secondly the anvil spreads freely across the
sky, hindering convection.
In a cruel twist a storm developed just off the coast tonight and there are
now several cells to the east and southeast of Wollongong. It seems that
only the coastal plain missed action today.
Still I would not mind betting that a storm may develop around 3-4am.
Michael Thompson
http://thunder.simplenet.com
| Document: 981213.htm
Updated: 25th February, 1999 |
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