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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Wednesday, 25 August 1999 |
From Subject
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001 Anthony Cornelius [cyclone at flatrate.net.au] Inland NSW storms for Thursday?
002 "Daniel Weatherhead" [dpw14 at hotmail.com] Sydney's west yesterday
003 Blair Trewin [blair at met.Unimelb.EDU.AU] Fremantle tornado?
004 Blair Trewin [blair at met.Unimelb.EDU.AU] Bureau policies
005 Paul_Mossman at agd.nsw.gov.au Fremantle tornado? - Media watch 3
006 peter.corlett at doi.vic.gov.au Mildura storm
007 Blair Trewin [blair at met.Unimelb.EDU.AU] Snow project
008 "Marty" [martyp at dynamite.com.au] Cheap Filters wanted
009 "Peter Adderley" [adderley at acay.com.au] West of Sydney
010 disarm at braenet.com.au Fremantle storm
011 disarm at braenet.com.au ABC article on Fremantle Storm
012 steve baynham [bayns at nor.com.au] electronic cable release
013 "Andrew Miskelly" [amiskelly at ozemail.com.au] Nice Mildura Radar
014 Blair Trewin [blair at met.Unimelb.EDU.AU] Nice Mildura Radar
015 Michael Scollay [michael.scollay at telstra.com. Nice Mildura Radar
016 peter.corlett at doi.vic.gov.au Nice Mildura Radar
017 "Mark Hardy" [mhardy at magna.com.au] (no subject)
018 Michael Scollay [michael.scollay at telstra.com. Bureau policies
019 Blair Trewin [blair at met.Unimelb.EDU.AU] Bureau policies
020 Matt Smith [disarm at braenet.com.au] some more photos
021 Don White [donwhite at ozemail.com.au] [Fwd: NSW storms]
022 "Mark Hardy" [mhardy at magna.com.au] (no subject)
023 steve baynham [bayns at nor.com.au] mildura radar
024 Halden Boyd [halden at lis.net.au] east coast radar
025 Michael Scollay [michael.scollay at telstra.com. Bureau policies
026 Michael Scollay [michael.scollay at telstra.com. east coast radar
027 Ira Fehlberg [jra at upnaway.com] Fremantle storm
028 "Andrew Miskelly" [amiskelly at ozemail.com.au] Nice Mildura Radar
029 "John Graham" [gorzzz at optusnet.com.au] electronic cable release
030 Blair Trewin [blair at met.Unimelb.EDU.AU] Nice Mildura Radar
031 "Michael Thompson" [michaelt at ozemail.com.au] some more photos
032 Michael Scollay [michael.scollay at telstra.com. Nice Mildura Radar
033 Mark Dwyer [mjd at wantree.com.au] Fremantle F0 Tornado
034 Anthony Cornelius [cyclone at flatrate.net.au] Bureau policies
035 wbc at ozemail.com.au (Laurier Williams) West of Sydney
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001
Date: Tue, 24 Aug 1999 23:37:43 +1000
From: Anthony Cornelius [cyclone at flatrate.net.au]
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Subject: Re: aus-wx: Inland NSW storms for Thursday?
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Hi Dave and all,
CAPE would/will be the most sensative of all the forecast indicies
(IMHO) available. This is because, it is so sensative to small changes
of moisture and heat at the surface, and the temperature fluxes in the
upper levels. LI's are also sensative, but are not subject to the same
differential conditions one would expect as the atmosphere as a whole,
rather than a fairly arbitrary level (ie 500mb).
The other thing that also has to be remembered (in CAPE verifications)
is that there are quite a few ways in calculating CAPE. Two popular
ways that I know of off hand are looking at the most bouyant parcel in
the lowest 300hPa, and also averaging out the first 50hPa (ie mixing
ratio) of air.
Surprisingly, both are going to give you very different answers at times
(although will generally be similar). I have seen soundings with CAPE's
over 4000, from warmer temperatures and 100% moisture at around the
900mb level, which would therefore mean the second method would
under-estimate the CAPE. Although, in reality, it would most probably
over-estimate the CAPE, but I'm open to suggestions & comments!
A 1000 CAPE is quite good, considering the time of year it still is.
One must remember, that the tropopause is still much lower than it is in
summer, and thus one would expect the EL (equilibrium level) to be lower
by a degree of severe km. This means, that instead of having your CAPE
distributed over a larger area of the atmosphere, it is more confined to
a smaller section, and thus can actually be more bouyant. -5 LI's are
certainly nice!
Anthony Cornelius
David Croan wrote:
>
> perhaps not now that I have opened my trap.....
>
> But it looks like we could see some more decent storm activity over
> central western NSW on Thursday - I suppose it is getting toward that
> time of year thankgod. Surface temps over the inland look like being
> mid 20's ahead of a cold front although I wish the 500 temps would drop
> back down a bit. A quick browse of AVN data set 48 hours out and
> forecast (03Z 26/8) LI is down to -5 ish [CAPE, which will be an
> interesting forecast tool to watch this season, is a whopping 1000J/kg
> over the same area :) ]. Other indices seem to give similar relatively
> storm friendly figures. There is also a little 200mb jet streak over
> the area as well.
>
> Thursday mornings Cobar sounding might be more revealing.
>
> Dave
>
> __________________________________________________
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> -----------------------jacob at iinet.net.au------------------------------
--
Anthony Cornelius
Queensland Coordinator of the Australian Severe Weather Association
(ASWA)
(07) 3390 4812
14 Kinsella St
Belmont, Brisbane
QLD, 4153
Please report severe thunderstorms on our Queensland severe thunderstorm
reporting line on (07) 3390 4218 or by going to our homepage at
http://www.severeweather.asn.au
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002
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From: "Daniel Weatherhead" [dpw14 at hotmail.com]
To: aussie-weather at world.std.com
Subject: aus-wx: Sydney's west yesterday
Date: Wed, 25 Aug 1999 09:31:42 EST
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Hey everyone,
It was weird yesterday because mostly in the morning there was lower level
cu humulis with dotted the sky like a perfect pattern. Above at a higher
level was lots of cirrus, actually where i am, heaps almost like a haze.
Anyway mid afternoon, in the space of an hour the clouds took off, except
there was nothing really strong about the updrafts, they seemed to dispate
once the sturcture was sorted out. So mid afternoon there was a very messy
western sky. There were was broken up cells with fibrous anvils, and no
bases.
Then behind this messy stuff was some very strong updrafts. Some crisp
clouds that I haven't seen for a while. After dusk you could see some
flashes in the sky and a partidge in a pear tree.
===========================
Daniel Weatherhead
weatherhead at ozemail.com.au
Blaxland, NSW
===========================
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com
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003
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: aus-wx: Fremantle tornado?
To: aussie-weather at world.std.com (Aussie Weather)
Date: Wed, 25 Aug 1999 10:28:30 +1000 (EST)
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Just heard a news report of a tornado severely damaging an apartment
building in Fremantle. Can any of the WA people enlighten us further?
Blair Trewin
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004
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Bureau policies
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 10:26:09 +1000 (EST)
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(snip)
> For those interested in even more esoteric details, the Bureau will,
> from 1 September, change its international exchange data bulletins to
> provide main and intermediate hour synoptic bulletins for about 120
> stations in Australia. What that means is that those first-order
> stations will report throughout the year at 00, 03, 06... 21 UTC, i.e.
> 10am, 1pm... EST, and 11am, 2pm... EDST. These stations will continue
> to report at the usual 9am, 12 noon... clock time as well, while all
> the other second level stations will continue as before.
>
> This is a major change for the Bureau. Virtually every country in the
> world reports at the standard hours of 00, 03.. UTC, the only
> exceptions being Australia, NZ during daylight saving, and some
> Pacific Islands. Our non-standard hours, and the partial one-hour
> shift during daylight saving time, give problems in both synoptic
> meteorology and climatology, so the change is in some ways a welcome
> one. Cynics might say, however, that it is a shrewd political move to
> maintain the 9am status quo: by fulfillling international obligations
> with a minimal network of stations, the issues surrounding total
> standardisation can be allowed to languish a while longer ;-).
I'm not sure if I'd describe them as cynics; retaining a standard
observation time for max/min temperatures is a fairly critical issue
for climate. Moving the observation time to 2100 UTC (0700 EST, 0800
EDT) would have meant a substantial reduction in mean minimum
temperatures - in the 1-1.5 degree range at the worst-affected
stations - as most cold nights were 'double-counted'.
>From the climate viewpoint, continuity of practices through time
is the most important issue - it is less important whether the
observation time is consistent with other countries (or even with
other states). From the synoptic meteorology point of view the
reverse is true. (A change which affects an entire network is a
particularly severe problem for climate, as there is no comparison
data which can be used to assess the impact of the change).
The proposed solution seems eminently sensible - there is no good
reason why automatic stations can't send out observations at any
time that is appropriate. (I don't think the time is too far away
when we'll be routinely archiving data at hourly or finer resolutions).
Note that only the Bureau-staffed stations have ever distributed
synoptic data internationally as far as I know (they are certainly
the only ones that distribute monthly climate data internationally).
> It will be interesting to see whether changes are to be made in the
> Bureau's upper air program when daylight saving starts. Upper air
> balloon flights normally are made at 22z during DST, even though they
> are "nominally" labelled as 00z, an important consideration for storm
> chasers. It means the Skew T and other diagrams you get from Wyoming
> Uni are not quite as up-to-date as indicated, because, whilst the data
> is collected an hour earlier, it is still distributed globally at the
> normal time.
I don't know the answer to this.
Blair Trewin
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005
From: Paul_Mossman at agd.nsw.gov.au
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Date: Wed, 25 Aug 1999 11:01:50 +1000
Subject: Re: aus-wx: Fremantle tornado? - Media watch 3
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Just heard on the radio - 3 people injured as roofed ripped off by
wait there - you guessed it - a MINI CYCLONE!!! typical media...........
not bad for a Mini Cyclone at this time of year!! Hmm I never thought of a
cyclone being mini mind you.
Paul at Port.
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006
From: peter.corlett at doi.vic.gov.au
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Date: Wed, 25 Aug 1999 10:50:49 +1000
Subject: aus-wx: Mildura storm
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Morning all,
There's an interesting storm on the radar near Mildura
showing small patches <100m/hr at 00.30 UTC. I also spotted some nice looking
"mares' tails" over Melbourne this morning, which may auger well for when the
front reaches here later today.
Cheers,
Pete.
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007
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Snow project
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 10:55:55 +1000 (EST)
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>
> On Tue, 24 Aug 1999 08:42:59 +1000, Don White
> wrote:
>
> >collecting a data base of all Australian snowfalls is one of my aims as
> >well - keen to be invloved
> >Don White
> >
> OK, That's Tim (Hunter Valley), Phil (SA), Don (Sydney) and I (Blue
> Mtns) -- anyone from Victoria? Tasmania? (Do we have any ASWA members
> or list participants from Tassie?
>
> I wrote an article on snow for the long-gone NSW Met Society journal
> many years ago which detailed snowfalls by season and locality. It
> would make a useful starting point. I could put it up on my web site
> when I either scan it or type it up. It would then be possible to
> progressively expand it as fresh information was dug up. This would at
> least provide an initial database of snowfall in Australia,
> concentrating more on snowfall away from the Alps. Is this the sort of
> thing you had in mind, Tim?
1. Off the topic slightly, I'd never heard of the NSW Met. Society
before (does it pre-date the Australian branch of the Royal Met.
Society - which evolved into AMOS - or was it operating in parallel
with it?). When did it operate, and does a full set of its journal
exist anywhere? (a brief search of the Bureau library's catalogue
drew a blank).
2. On the subject of snow, I'd be interested in being involved as well.
There has already been a bit of work done, mostly in the form of
'Meteorological Notes' (which are essentially internal technical
bulletins) - I'm aware of one covering major snowfalls to affect
Canberra, and a couple more looking at specific events, such as the
cold outbreak of July 1986. I'll follow up references.
Someone who has done a fair bit of work on snow forecasting in the
Australian context is Clem Davis of the Canberra Meteorological
Office. (He is almost certainly the only contributor to the AMOS
Bulletin who also had his picture in the corresponding issue of 'FHM'
- accompanying a piece on snow).
Blair Trewin
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008
From: "Marty" [martyp at dynamite.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Cheap Filters wanted
Date: Wed, 25 Aug 1999 11:16:56 +1000
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Hi Andrew,
Filters aren't toooooo expensive; I guess it depends on your point of view. But
you should be able to pick up a new UV filter (as opposed to a polariser, which
would greatly enhance your sky photos) for around $20 or $30 dollars from any
camera supply place.
>Also anyone know of
>some cheap places to get an electronic cable release to suit this camera
>aswell??
What's an ELECTRONIC cable release? I have a manual one, but what does an
electronic one do??
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: Andrew Wall [astroman at chariot.net.au]
To: aussie-weather at world.std.com [aussie-weather at world.std.com]
Date: Tuesday, 24 August 1999 19:31
Subject: aus-wx: Cheap Filters wanted
>Hi everyone,
>
>Does anyone know of anyone who either makes or can get hold of cheap
>filters for cameras???
>
>I own a Pentax MZ-20 with a Sigma 28-70mm 1:2.8-4 Lens on the front. The
>filter I am after is a UV filter which I think might help bring out more
>detail in cloud pictures etc... I heard someone on the list can make them
>cheap, but for the life of me I cannot remember who. Also anyone know of
>some cheap places to get an electronic cable release to suit this camera
>aswell??
>
>Also Does anyone have any information on this camera as I cannot seem to
>get hold of instructions for it.
>
>Oh BTW onto weather, We are expecting the first of our Spring/summer storms
>to hit the Adelaide Metro area between the 16th and 20th of September, lets
>hope its a good one like last years event on the 22nd..:)
>
>
>Really any help appreciated.
>Thanks
>
>Andrew Wall (VK5NAJ)
>15 Elio Drv,
>Paralowie 5108,
>South Australia.
>
>ph. (08) 82854590
>
>S.A. / N.T. Co-ordinator for the ASWA Inc.
>-------------------------------------------------------------------------------
>S.A. Lightning Page - http://lightning.virtualave.net (I know it needs
>updating)
>ASWA Inc. Webpage - http://www.severeweather.asn.au
>
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> -----------------------jacob at iinet.net.au------------------------------
>
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009
From: "Peter Adderley" [adderley at acay.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: West of Sydney
Date: Tue, 24 Aug 1999 23:21:46 +1000
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> Looks to be heading towards Sydney.
With apologies to those who cannot view html email (and therefore can't see the pic below.)
This is Mt Yengo. It lives in the middle of the Macdonald River valley about 65km NW of Gosford and stands 668m above sea level.
I've often wondered about what sort of weather conditions may prevail here, since it's not inhabited.
It would certainly be a wonderful vantage point for viewing the weather patterns approaching Sydney over the mountains.
The pic was taken last Thursday at sunset from the Finchley viewing platform west of Wollombi.
PS I took several shots as the sun went down. The sequence made a rather cute animated gif.
I've also had the pleasure of viewing this area from directly above from the cockpit of an Ansett jet.
My brother also took a timelapse movie of the stars last years from this point,
which some may have seen on "The Planets" series on ABC TV.
cheers,
Peter
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010
From: disarm at braenet.com.au
X-Sender: disarm at braenet.com.au (Unverified)
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Date: Wed, 25 Aug 1999 12:00:05 +1000
To: aussie-weather at world.std.com
Subject: aus-wx: Fremantle storm
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Sky News opening lines were "A mini cyclone has hit " *sigh* , and later
on they said "the locals call it a cock eyed bob", they also reported winds
up to 140km/h...damage footage was interesting with regards to the
building(the helicopter shot), will be on the news tonight for sure. keep
an eye out for it.
Matthew Smith
ASWA Committee Member
----------Storm Chase Reports and Photos:---------
------http://www.braenet.com.au/~disarm-----
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011
From: disarm at braenet.com.au
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Date: Wed, 25 Aug 1999 11:41:19 +1000
To: aussie-weather at world.std.com
Subject: aus-wx: ABC article on Fremantle Storm
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Fremantle cleans up after freak storm
Police and rescue workers are now cleaning up after
this morning's freak storm which caused widespread
damage across Fremantle and surrounding suburbs.
The weather bureau is still assessing the nature of the
storm but says a downburst, or sudden downward rush
of cold air, could have caused the damage.
Residents say the wind storm struck about 6:00am
AWST collapsing the top floor of an eight-story block
of flats in East Street.
Several roofs in other areas collapsed under the fury of
the storm and a number of garden sheds were flung
hundreds of metres into the air.
The storm also damaged an antique store in Silas
Street, as well as houses at the old Ridgeway
development and a car yard in Fremantle.
Two people trapped in the East Street apartment
building managed to escape, while a third, an elderly
woman, was taken to hospital with minor injuries.
Matthew Smith
ASWA Committee Member
----------Storm Chase Reports and Photos:---------
------http://www.braenet.com.au/~disarm-----
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012
X-Sender: bayns at nornet.nor.com.au
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Date: Sat, 14 Aug 1999 12:37:25 +1000
To: aussie-weather at world.std.com
From: steve baynham [bayns at nor.com.au]
Subject: aus-wx: electronic cable release
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
hey marty and all
an electronic cable release is very basic! and is easily home-made. the little plug that you find on the end of your headphones....the cable release uses the same thing but only smaller, it simply plugs into the hole in the camera, and when you press the button it makes the two points (inner and outer) contact, acting as a switch. you have to be careful these days, i didn't know about them either for a while, i was using a manual cable for my camera but it never worked properly and many of my photos failed. then i found out i was spose to use a electronic one. i bought one for about 15 bucks i think, but when i realised how basic they were, i made my own better version.
steve
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013
From: "Andrew Miskelly" [amiskelly at ozemail.com.au]
To: "AusWx" [aussie-weather at world.std.com]
Subject: aus-wx: Nice Mildura Radar
Date: Wed, 25 Aug 1999 13:08:47 +1000
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Hi all,
Does any one know what's happening around - south of - mildura at the
moment? Sensational Radar!
Andrew
--
Andrew Miskelly
Illawarra/Southern Tablelands, NSW
amiskelly at ozemail.com.au
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014
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Nice Mildura Radar
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 13:23:29 +1000 (EST)
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>
> Hi all,
>
> Does any one know what's happening around - south of - mildura at the
> moment? Sensational Radar!
>
> Andrew
It looks like it's got a lot of potential. Mildura Airport is reporting
rain as its present weather at 1300, but with no accumulation yet.
There's a fairly solid rainband stretching from Mildura to Cape Otway,
with its leading edge near Ballarat.
Blair Trewin
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015
Date: Wed, 25 Aug 1999 13:32:05 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.5.1 sun4m)
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Nice Mildura Radar
Sender: aussie-weather-approval at world.std.com
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Andrew Miskelly wrote:
>
> Hi all,
>
> Does any one know what's happening around - south of - mildura at the
> moment? Sensational Radar!
Weakening cold front that was located about Adelaide at 00Z is
pushing up some nice storms ahead. Animation reveals a SE movement
of the cells basically either side of the axis of the Murray River.
They do look a bit sus from the SS perspective as they are well
sustained but there seems to be no movement away from the prevailing
environmental winds. Just some nice multicell thunderstorms ahead of
the cold front that'll die before they reach the ranges (maybe:-).
Michael Scollay mailto:michael.scollay at telstra.com.au
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016
From: peter.corlett at doi.vic.gov.au
X-Lotus-FromDomain: DOI
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 13:46:10 +1000
Subject: Re: aus-wx: Nice Mildura Radar
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Andrew,
The BoM's 00UTC analysis shows a pre-frontal trough
extending into NW Victoria. Its possible the Mildura acitivity is associated
with this, but I have no idea why it is so intense.
The BoM has also issued flood warnings for Nthn. Vic.
Cheers,
Pete.
Hi all,
Does any one know what's happening around - south of - mildura at the
moment? Sensational Radar!
Andrew
--
Andrew Miskelly
Illawarra/Southern Tablelands, NSW
amiskelly at ozemail.com.au
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017
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Wed, 25 Aug 1999 13:18:39 +1000
Subject: Re: aus-wx: Bureau policies
From: "Mark Hardy" [mhardy at magna.com.au]
To: aussie-weather at world.std.com
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Blair
It has often puzzled me why the BoM do not take minimum temperature readings
at 3pm. This would avoid double counting very cold or slow starting
mornings. In fact all that would be required is a min reset at 3pm. Sounds
logical. Any comments?
Mark
--
_____________________________________________________
Mark Hardy.
The Weather Company Pty. Ltd.
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
Mobile 0414 642 739
email: mhardy at theweather.com.au
_____________________________________________________
----------
>From: Blair Trewin
>To: aussie-weather at world.std.com
>Subject: Re: aus-wx: Bureau policies
>Date: Wed, 25 Aug 1999 10:26 AM
>
> (snip)
>
>> For those interested in even more esoteric details, the Bureau will,
>> from 1 September, change its international exchange data bulletins to
>> provide main and intermediate hour synoptic bulletins for about 120
>> stations in Australia. What that means is that those first-order
>> stations will report throughout the year at 00, 03, 06... 21 UTC, i.e.
>> 10am, 1pm... EST, and 11am, 2pm... EDST. These stations will continue
>> to report at the usual 9am, 12 noon... clock time as well, while all
>> the other second level stations will continue as before.
>>
>> This is a major change for the Bureau. Virtually every country in the
>> world reports at the standard hours of 00, 03.. UTC, the only
>> exceptions being Australia, NZ during daylight saving, and some
>> Pacific Islands. Our non-standard hours, and the partial one-hour
>> shift during daylight saving time, give problems in both synoptic
>> meteorology and climatology, so the change is in some ways a welcome
>> one. Cynics might say, however, that it is a shrewd political move to
>> maintain the 9am status quo: by fulfillling international obligations
>> with a minimal network of stations, the issues surrounding total
>> standardisation can be allowed to languish a while longer ;-).
>
> I'm not sure if I'd describe them as cynics; retaining a standard
> observation time for max/min temperatures is a fairly critical issue
> for climate. Moving the observation time to 2100 UTC (0700 EST, 0800
> EDT) would have meant a substantial reduction in mean minimum
> temperatures - in the 1-1.5 degree range at the worst-affected
> stations - as most cold nights were 'double-counted'.
>
>>From the climate viewpoint, continuity of practices through time
> is the most important issue - it is less important whether the
> observation time is consistent with other countries (or even with
> other states). From the synoptic meteorology point of view the
> reverse is true. (A change which affects an entire network is a
> particularly severe problem for climate, as there is no comparison
> data which can be used to assess the impact of the change).
>
> The proposed solution seems eminently sensible - there is no good
> reason why automatic stations can't send out observations at any
> time that is appropriate. (I don't think the time is too far away
> when we'll be routinely archiving data at hourly or finer resolutions).
>
> Note that only the Bureau-staffed stations have ever distributed
> synoptic data internationally as far as I know (they are certainly
> the only ones that distribute monthly climate data internationally).
>
>> It will be interesting to see whether changes are to be made in the
>> Bureau's upper air program when daylight saving starts. Upper air
>> balloon flights normally are made at 22z during DST, even though they
>> are "nominally" labelled as 00z, an important consideration for storm
>> chasers. It means the Skew T and other diagrams you get from Wyoming
>> Uni are not quite as up-to-date as indicated, because, whilst the data
>> is collected an hour earlier, it is still distributed globally at the
>> normal time.
>
> I don't know the answer to this.
>
> Blair Trewin
>
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>
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018
Date: Wed, 25 Aug 1999 14:59:06 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.5.1 sun4m)
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Bureau policies
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Mark Hardy wrote on Wed, 25 Aug 1999 13:18:39 +1000:
>
> Blair
>
> It has often puzzled me why the BoM do not take minimum temperature
> readings at 3pm. This would avoid double counting very cold or slow
> starting mornings. In fact all that would be required is a min reset
> at 3pm. Sounds logical. Any comments?
As a seemingly unrelated phenomena and only since I've been comparing
Obs with AVN/MRF model data that I've automatically downloaded for
producing a particular Snowy Mts forecast for a ski club that I'm a
member of... After applying proper corrections etc. I have consistently
found the model forecast environmental temps to be higher than that
observed, particularly at night. Daytime is less of a problem. Could
this be because the utlimate Obs data being fed back into the models
is not "standard" when compared to equivalent obs data from USA
stations for example?
Michael Scollay mailto:michael.scollay at telstra.com.au
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019
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Bureau policies
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 14:49:28 +1000 (EST)
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>
> Blair
>
> It has often puzzled me why the BoM do not take minimum temperature readings
> at 3pm. This would avoid double counting very cold or slow starting
> mornings. In fact all that would be required is a min reset at 3pm. Sounds
> logical. Any comments?
>
> Mark
Agreed that it makes sense - and in fact it was the practice at some
(many?) stations prior to 1963. I expect the reason for using 0900 is
that a uniform time was wanted across the network, and there are
some stations (although not many these days) that only observe at
0900. (Going back even further, the history of the 0900 observation
time as the rainfall standard is that, when much of the network was
at post offices, the weather observation constituted the 'test'
telegraph transmission at the start of the working day).
Non-NWS stations in the U.S. choose their own observation times, which
makes for a bit of a mess - in fact, in their case THE primary factor
in choosing stations for climate change networks is that they have
maintained a uniform observation time (fortunately, the Americans
have so many temperature stations that they can afford to be choosy -
unlike our situation where we have to make use of what we have).
Blair Trewin
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020
X-Sender: disarm at braenet.com.au (Unverified)
X-Mailer: Windows Eudora Pro Version 3.0 (32)
Date: Wed, 25 Aug 1999 15:32:12 +1000
To: aussie-weather at world.std.com
From: Matt Smith [disarm at braenet.com.au]
Subject: aus-wx: some more photos
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
I have scanned a couple of more photos..
http://www.braenet.com.au/~disarm/temp/temp1.JPG <-- weak mammatus from a
few days ago..
http://www.braenet.com.au/~disarm/temp/temp2.JPG <-- yesterdays storm over
the blue mountains
http://www.braenet.com.au/~disarm/14-08-99/14-08-99-06.JPG August 8
http://www.braenet.com.au/~disarm/14-08-99/14-08-99-07.JPG August 8 sunset
(blurry as it started raining as soon as i took the photo)
Cheers
Matt Smith
Matthew Smith
ASWA Committee Member
----------Storm Chase Reports and Photos:---------
------http://www.braenet.com.au/~disarm-----
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021
Date: Wed, 25 Aug 1999 15:22:42 +1000
From: Don White [donwhite at ozemail.com.au]
X-Mailer: Mozilla 4.5 [en] (Win98; I)
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To: Aussie Weather [aussie-weather at world.std.com]
Subject: aus-wx: [Fwd: NSW storms]
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Isolated heavy storms were reported around the central west of NSW late
yesterday - mostly unexpected and unforecast. It appears that the storm
cells were small, shortlived and slow moving. There was a report of road
wash-a-way NW of Orange around 3.30 pm, and another heavy rain burst hit
between Dubbo and Dunedoo but as is often the case most miss the
isolated rain gauges.
However, there was a bit of luck with Mendooran, a small place 58 kms NE
of Dubbo on the road to Coonabarabran. A storm moved in from the north -
a rare direction according to locals and hit shortly after 4pm.
Initially all precipitation was in the form of small hail. All up 42 mm
fell between 4 and 4.45 but according to the PO, most of the storm had
passed by quarter past 4. A fair bit of water damage was reported.The
ground was completely white. About 4 km north and 3 kms south of the
town - no rain fell... in fact, the observer I spoke to said the sun
shone through most of the storm.. it built up to the north with a purple
bottom without rain and all of a sudden a curtain a rain came down as if
someone opened a gate... but where it went to was a mystery - after it
passed there clouds all but disappeared completely.
Don White
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022
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Wed, 25 Aug 1999 15:43:30 +1000
Subject: Re: aus-wx: Bureau policies
From: "Mark Hardy" [mhardy at magna.com.au]
To: aussie-weather at world.std.com
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Michael
I can't help but feel that a lot of the issues you are encountering with the
model data are related to the resolution of the topography in the model. I
have not checked, but I would imagine that the MRF runs a topography dataset
of about 75km resolution. This effectively averaged out the altitude so the
max elevation of Australia according to the MRF might be only 1000m. This
would explain the difference between the observed obs and the gridded obs.
Mark
--
_____________________________________________________
Mark Hardy.
The Weather Company Pty. Ltd.
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
Mobile 0414 642 739
email: mhardy at theweather.com.au
_____________________________________________________
----------
>From: Michael Scollay
>To: aussie-weather at world.std.com
>Subject: Re: aus-wx: Bureau policies
>Date: Wed, 25 Aug 1999 2:59 PM
>
> Mark Hardy wrote on Wed, 25 Aug 1999 13:18:39 +1000:
>>
>> Blair
>>
>> It has often puzzled me why the BoM do not take minimum temperature
>> readings at 3pm. This would avoid double counting very cold or slow
>> starting mornings. In fact all that would be required is a min reset
>> at 3pm. Sounds logical. Any comments?
>
> As a seemingly unrelated phenomena and only since I've been comparing
> Obs with AVN/MRF model data that I've automatically downloaded for
> producing a particular Snowy Mts forecast for a ski club that I'm a
> member of... After applying proper corrections etc. I have consistently
> found the model forecast environmental temps to be higher than that
> observed, particularly at night. Daytime is less of a problem. Could
> this be because the utlimate Obs data being fed back into the models
> is not "standard" when compared to equivalent obs data from USA
> stations for example?
>
> Michael Scollay mailto:michael.scollay at telstra.com.au
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com
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> message.
> -----------------------jacob at iinet.net.au------------------------------
>
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023
X-Sender: bayns at nornet.nor.com.au
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Date: Sat, 14 Aug 1999 16:10:26 +1000
To: aussie-weather at world.std.com
From: steve baynham [bayns at nor.com.au]
Subject: aus-wx: mildura radar
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
hey all,
we were caught out a few days ago, the radar was showing massive areas of red, but things just weren't right. we came to the conclusion that it was being extremely sensitive. i don't know about this occassion though.....
steve
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024
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Date: Wed, 25 Aug 1999 16:22:33 +1000
To: aussie-weather at world.std.com
From: Halden Boyd [halden at lis.net.au]
Subject: Re: aus-wx: east coast radar
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
It appears the BOM's east coast radar network on the net is down
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025
Date: Wed, 25 Aug 1999 16:35:44 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.5.1 sun4m)
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Subject: Re: aus-wx: Bureau policies
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Mark Hardy wrote:
>
> Michael
>
> I can't help but feel that a lot of the issues you are encountering with the
> model data are related to the resolution of the topography in the model. I
> have not checked, but I would imagine that the MRF runs a topography dataset
> of about 75km resolution. This effectively averaged out the altitude so the
> max elevation of Australia according to the MRF might be only 1000m. This
> would explain the difference between the observed obs and the gridded obs.
Mark,
See some other mail that I've sent about this issue...particularly
the one with a copy of a reply from the chief of NCEP Global Modelling
Branch. As I said in the previous mail, I apply corrections to the AVN
and MRF model data, specifically;
- derive temps at a height as function of the lapse rate between
two given heights, say 850mb and 700mb. This has proven to be
very close to reality under sustained "total cloud".
- correct temps at a height as a function of the difference
between model 2m surface temps and the expected environmental
temp for that 2m "surface" height. This has proven to provide
almost acceptable diurnal temp ranges that effectively takes
into account surface radiation effects etc. except the major
effect of snow cover, so it seems. I've applied some "weighting"
to correct for this - still experimental though.
So I have taken into account the model topograhic assumptions even
to the extent of correcting precipitation forecasts to take into
account topographic issues that are not properly covered by model
resolution limitations.
Net result is an excellent forecast to +72hrs but still with
this nagging error of a couple of degrees or so that is only on
the minimum temp extreme scale though. If it were only a topographic
error, then I would see a similar error on the maximum temp. However,
maximum temps are remarkedly close (+ or - 0.5C) as I've kept
records for Thredbo AWS, Cabramurra AWS, Perisher Valley and
Charlottes Pass while generating metrogram forecasts for all
four.
So I thought that perhaps this minimim-only anomaly was due
to the Obs data being fed back into the models. A long shot,
but entirely plausible IMHO.
Michael Scollay mailto:michael.scollay at telstra.com.au
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026
Date: Wed, 25 Aug 1999 17:00:15 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
X-Mailer: Mozilla 4.5 [en] (X11; I; SunOS 5.5.1 sun4m)
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: east coast radar
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Halden Boyd wrote:
>
> It appears the BOM's east coast radar network on the net is down
Radar archive reported the loss of the 0610Z image only.
Michael Scollay mailto:michael.scollay at telstra.com.au
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027
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Date: Wed, 25 Aug 1999 02:46:19 +0800
To: aussie-weather at world.std.com
From: Ira Fehlberg [jra at upnaway.com]
Subject: Re: aus-wx: Fremantle storm
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Im afraid people that the BOM has stooped to new lows here, I cant believe
i just heard on the radio, the senior forecaster at the BOM refer to this
morings event as, yes you guessed it, a possible 'mini tornado" no f at #$%&g
wonder the media get it wrong!! I cant beleive he said
that..........unbelieveable. I shook my head in disbelief. Oh well, on the
point of the storm at this stage i doubt it was a nader but Im going to go
down to check out the damage, will let you all know.
Ira Fehlberg
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028
From: "Andrew Miskelly" [amiskelly at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: Nice Mildura Radar
Date: Wed, 25 Aug 1999 16:43:41 +1000
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Damn it, either the Mildura Radar's cactus or I wish we had someone (me
would do!!) there! If what's showing is actually happening I would have
expected a warning or something for flash flooding to show up...
--
Andrew Miskelly
Illawarra/Southern Tablelands, NSW
amiskelly at ozemail.com.au
-----Original Message-----
From: Andrew Miskelly [amiskelly at ozemail.com.au]
To: AusWx [aussie-weather at world.std.com]
Date: Wednesday, 25 August 1999 13:16
Subject: aus-wx: Nice Mildura Radar
>Hi all,
>
>Does any one know what's happening around - south of - mildura at the
>moment? Sensational Radar!
>
>Andrew
>
>--
>Andrew Miskelly
>Illawarra/Southern Tablelands, NSW
>amiskelly at ozemail.com.au
>
>
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029
From: "John Graham" [gorzzz at optusnet.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: electronic cable release
Date: Wed, 25 Aug 1999 17:37:57 +1000
X-Mailer: Microsoft Outlook Express 5.00.2014.211
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
----- Original Message -----
From: steve baynham [bayns at nor.com.au]
To: [aussie-weather at world.std.com]
Sent: Saturday, August 14, 1999 12:37 PM
Subject: aus-wx: electronic cable release
> hey marty and all
> an electronic cable release is very basic! and is easily home-made. the
little plug that you find on the end of your headphones....the cable release
uses the same thing but only smaller, it simply plugs into the hole in the
camera, and when you press the button it makes the two points (inner and
outer) contact, acting as a switch. you have to be careful these days, i
didn't know about them either for a while, i was using a manual cable for my
camera but it never worked properly and many of my photos failed. then i
found out i was spose to use a electronic one. i bought one for about 15
bucks i think, but when i realised how basic they were, i made my own better
version.
> steve
>
If you made one up for the Ricoh, can you make me one up too??(grovel,
grovel)..........
John from Ballina
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030
From: Blair Trewin [blair at met.Unimelb.EDU.AU]
Subject: Re: aus-wx: Nice Mildura Radar
To: aussie-weather at world.std.com
Date: Wed, 25 Aug 1999 17:40:36 +1000 (EST)
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>
> Damn it, either the Mildura Radar's cactus or I wish we had someone (me
> would do!!) there! If what's showing is actually happening I would have
> expected a warning or something for flash flooding to show up...
> --
> Andrew Miskelly
> Illawarra/Southern Tablelands, NSW
> amiskelly at ozemail.com.au
It looks pretty impressive, but they've recorded only 2.4 mm so far
(and it's being reported as rain rather than thunderstorms). I wonder
if there's something funny with the radar too.
Quite warm in eastern Victoria today (26 at Orbost and Lakes Entrance),
but no records as far as I can tell - most of these areas reached 28
on August 25, 1995.
Blair Trewin
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031
From: "Michael Thompson" [michaelt at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: Re: aus-wx: some more photos
Date: Wed, 25 Aug 1999 17:57:21 +1000
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Thanks for posting the storm pics, I suspected that the storms were not that
high.Yesterday there was nothing to be seen from Wollongong. I can see
storms all the way to Lithgow from here if they are sufficiently high.
Michael.
> I have scanned a couple of more photos..
>
> http://www.braenet.com.au/~disarm/temp/temp1.JPG <-- weak mammatus from a
> few days ago..
>
> http://www.braenet.com.au/~disarm/temp/temp2.JPG <-- yesterdays storm over
> the blue mountains
>
> http://www.braenet.com.au/~disarm/14-08-99/14-08-99-06.JPG August 8
> http://www.braenet.com.au/~disarm/14-08-99/14-08-99-07.JPG August 8 sunset
> (blurry as it started raining as soon as i took the photo)
>
>
> Cheers
>
> Matt Smith
>
> Matthew Smith
>
> ASWA Committee Member
>
> ----------Storm Chase Reports and Photos:---------
> ------http://www.braenet.com.au/~disarm-----
>
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> -----------------------jacob at iinet.net.au------------------------------
>
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032
Date: Wed, 25 Aug 1999 18:25:55 +1000
From: Michael Scollay [michael.scollay at telstra.com.au]
Organization: Telstra Strategy & Research
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Nice Mildura Radar
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Andrew Miskelly wrote:
>
> Damn it, either the Mildura Radar's cactus or I wish we had someone (me
> would do!!) there! If what's showing is actually happening I would have
> expected a warning or something for flash flooding to show up...
Not just that area. There seems to be something major going on that's
also bringing down microwave radio sites that is stuffing up the Telstra
network:-( Outages all over the place.
My archive reports outages of radar inclusive 0520Z to 0610Z and again
at 0750Z.
Last image of 0740Z shows a very sus multicell complex with large
areas of +100m/hr due E of Mildura. At 0800Z this reduced a little
to patches of +100mm/hr and large areas of 40-100mm/hr. I wouldn't
be surprised if this turns out to be a supercell supporting naders
as it's beginning to track more independently of the environmental
winds and taking on that classic hooked shape. Any real obs yet?
Michael Scollay mailto:michael.scollay at telstra.com.au
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033
Date: Wed, 25 Aug 1999 19:52:52 +0800
From: Mark Dwyer [mjd at wantree.com.au]
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To: "aussie-weather at world.std.com" [aussie-weather at world.std.com]
Subject: aus-wx: Fremantle F0 Tornado
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Well yo have most properly heard about the mini tornado this morning
that hit Fremantle first, Then went on to hit parts of Palmyra and then
dissipated in Melville.
It's path was about 6-7 Km long, the nader was about 50m wide, along
that path it touched down at least several times also. Winds were
reported ~ at 180 km/h at its peak. It reportedly touched down several
times along the path of this storm.
IT has been confirmed as a tornado by the BoM at 6 PM (WST), Ira has
been down an assessed the damage path from this weather event this
evening. An apartment block in East st East Fremantle was the worst hit
by this F0 nader. Check out this url thanx to JungleJim for this, From
the ABC network
www.abc.net.au/news/state/wa/metwa-25aug1999-8.htm . Three people were
hurt during this storm, one been an old lady that was trapped form
falling debris. From when the roof was lifted of the apartment block,
were she lived.
P.S. does any one have radar loops of this storm this morning From about
5:30 - 7:00 am WST.
We will post any further news that comes to hand when we get any more on
it .
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034
Date: Wed, 25 Aug 1999 21:47:06 +1000
From: Anthony Cornelius [cyclone at flatrate.net.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Bureau policies
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Hi Michael and all,
> See some other mail that I've sent about this issue...particularly
> the one with a copy of a reply from the chief of NCEP Global Modelling
> Branch. As I said in the previous mail, I apply corrections to the AVN
> and MRF model data, specifically;
Michael - are you talking about analysis data, or forecast data?
Originally I thought that you were talking about analysis data. If it
is analysis, I was/am under the impression that AVN only gets 6hr'ly
datasets, if this is the case, then one would envisage that this would
have an adverse effect on the min's/max's recorded by AVN.
The other thing is, although you are applying corrections etc to the
data, are these exact? It could be possible that our great friend
'chaos' is effecting some of the results you are getting, by both AVN
and corrections you use, even just by generalising the topography, could
possibily have a significant effect on the outcomes you are receiving.
The other possible explanation would be, that due to the dispersal and
isolation of AWS's/obs/data recording etc - that to try and get a
temperature at one section would be rather dodgy. As all the model can
do is look at the data is received around it, and extrapolate from it...
--
Anthony Cornelius
Queensland Coordinator of the Australian Severe Weather Association
(ASWA)
(07) 3390 4812
14 Kinsella St
Belmont, Brisbane
QLD, 4153
Please report severe thunderstorms on our Queensland severe thunderstorm
reporting line on (07) 3390 4218 or by going to our homepage at
http://www.severeweather.asn.au
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035
From: wbc at ozemail.com.au (Laurier Williams)
To: aussie-weather at world.std.com
Subject: Re: aus-wx: West of Sydney
Date: Wed, 25 Aug 1999 13:08:33 GMT
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On Tue, 24 Aug 1999 23:21:46 +1000, "Peter Adderley"
wrote:
>> Looks to be heading towards Sydney.
>
>With apologies to those who cannot view html email (and therefore can't see the pic below.)
>This is Mt Yengo. It lives in the middle of the Macdonald River valley about 65km NW of Gosford and stands 668m above sea level.
>I've often wondered about what sort of weather conditions may prevail here, since it's not inhabited.
>It would certainly be a wonderful vantage point for viewing the weather patterns approaching Sydney over the mountains.
>The pic was taken last Thursday at sunset from the Finchley viewing platform west of Wollombi.
>
Peter, there's an automatic weather station on Nullo Mountain, which
is 70km NW of Yengo. At 1150m it's a fair bit higher, but its
observations would give you some idea of the weather in this strange
area.
--
Laurier Williams
Australian Weather Links and News
http://www.ozemail.com.au/~wbc/
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| Document: 990825.htm
Updated: 09 September 1999 |
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