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Storm News
[Index][Aussie-Wx] |
Australian Weather Mailing List Archives: Thursday, 27 January 2000 |
From Subject
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001 "Patrick Tobin" [patricktobin at ozemail.com.au] Moderate falls in ACT/Sthn NSW
002 Chas & Helen Osborn [hosborn at tassie.net.au] Strahan Weather
003 "Mark Hardy" [mhardy at magna.com.au] Strahan Weather
004 Lyle Pakula [LyleP at oakton.com.au] USA Winter?
005 Lyle Pakula [LyleP at oakton.com.au] Sunshine..Woohooo !!!
006 "Jane ONeill" [cadence at rubix.net.au] MSC's first webcam funnel chase
007 "mbath at ozemail.com.au" [mbath at ozemail.com.au] Lithgow chase
008 Michael Scollay [michael.scollay at telstra.com. An interesting weekend!
009 Michael Scollay [michael.scollay at telstra.com. Archives
010 Ben Quinn [bodie at flatrate.net.au] Webcam
011 Miguel de Salas [mm_de at postoffice.utas.edu.au Webcams please?
012 Matt Smith [disarm at braenet.com.au] Webcams please?
013 Michael Scollay [michael.scollay at telstra.com. USA Winter?
014 "Mark Hardy" [mhardy at magna.com.au] USA Winter?
015 Michael Scollay [michael.scollay at telstra.com. Forgive me.....one more please....models.....
016 Michael Scollay [michael.scollay at telstra.com. Possible Australian January record low
017 Dean S [deansgar at alphalink.com.au] CAPE
018 Dean S [deansgar at alphalink.com.au] Webcams please?
019 "Paul Mossman" [paulmoss at tpgi.com.au] 3 TC's now going / At long last another Great Storm
020 "Mark Hardy" [mhardy at magna.com.au] Alice Springs humidity
021 "Mark Hardy" [mhardy at magna.com.au] CAPE
--------------------------------------------------------------------------------------
001
From: "Patrick Tobin" [patricktobin at ozemail.com.au]
To: [aussie-weather at world.std.com]
Subject: aus-wx: Moderate falls in ACT/Sthn NSW
Date: Thu, 27 Jan 2000 08:08:33 +1100
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A couple of good falls in ACT/Sthn NSW
overnight. Checking the Metars at 7.30am shows since 9.00am yesterday that
Canberra has received 35.6mm - with I would guess 30mm falling in 1-2 hours
around 1.00-2.00am this morning, (36mm in my guage at Higgins - remarkably close
to the airport figure although I am 20+ km from the airport site) 15mm at Cooma
(anything above 1mm is a good fall for this town in the rainshadow of the
highest part of the Gt Dividing Range to the west) and 49.8mm at
Wagga.
Falls to the north have been much lighter so far
(ie Goulburn 0.8mm, Young 1.6mm).
We now have clear skies and sunshine - no real
indication in the sky as to whether this means storms or a fine sunny day
-models suggest possible showers/storms (LI's around -1 or -2, CAPE about 600
for 0600z) not wonderful but not bad for this area - so heres
hoping.
Patrick
002
Date: Thu, 27 Jan 2000 08:17:30 +1100
From: Chas & Helen Osborn [hosborn at tassie.net.au]
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To: Australian Weather Mailing List [aussie-weather at world.std.com]
Subject: aus-wx: Strahan Weather
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Hello Everyone
Thanks to Michael and Mark for their explanation on thunderstorm
activity.
With the thoughts of small land mass I had a look at the Strahan
statistics and noted the temperature range of
Mean Daily Max Temp 20.3C for Feb to 12.2C for July a difference of only
8.1C.
Mean Daily Min Temp 10.6C for Jan to 4.8C for July a difference of only
5.8C.
I know we have a easy climate to live in, you just have to own a gortex
raincoat to get by.
I assume our difference in temperature from summer to winter is low.
Is their other stations outside the tropics with similar temp
differences?
Light rain most of the day. Unfortunately put a dampner on the Mt Lyall
picnic day and Australia Day celebrations.
Chas
Strahan Tasmania
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003
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Date: Thu, 27 Jan 2000 08:38:33 +1100
Subject: Re: aus-wx: Strahan Weather
From: "Mark Hardy" [mhardy at magna.com.au]
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Chas
Many Tasmanian towns have low seasonal and daily temperature ranges. Burnie
for example has the one of the lowest temperatures ranges in Australia
(outside of the tropics of course).
MH
_____________________________________________________
Mark Hardy.
Weather 21
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
email: markh at weather21.com.au
_____________________________________________________
----------
>From: Chas & Helen Osborn
>To: Australian Weather Mailing List
>Subject: aus-wx: Strahan Weather
>Date: Thu, 27 Jan 2000 8:17
>
> Hello Everyone
>
> Thanks to Michael and Mark for their explanation on thunderstorm
> activity.
> With the thoughts of small land mass I had a look at the Strahan
> statistics and noted the temperature range of
> Mean Daily Max Temp 20.3C for Feb to 12.2C for July a difference of only
> 8.1C.
> Mean Daily Min Temp 10.6C for Jan to 4.8C for July a difference of only
> 5.8C.
> I know we have a easy climate to live in, you just have to own a gortex
> raincoat to get by.
> I assume our difference in temperature from summer to winter is low.
> Is their other stations outside the tropics with similar temp
> differences?
>
> Light rain most of the day. Unfortunately put a dampner on the Mt Lyall
> picnic day and Australia Day celebrations.
>
> Chas
> Strahan Tasmania
>
>
>
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> -----------------------jacob at iinet.net.au------------------------------
>
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004
From: Lyle Pakula [LyleP at oakton.com.au]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: RE: aus-wx: USA Winter?
Date: Thu, 27 Jan 2000 09:40:20 +1100
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A friend of mine is in Winter Park, CO. The weather.com have been
forecasting 3" snow falls, however, they have received over 3 feet in the
last 3 days of 'the lightest pow' he has ever seen. He was also there all
last season so it must be pretty good.
Cheers,
Lyle
> -----Original Message-----
> From: Lindsay [mailto:writer at lisp.com.au]
> Sent: Wednesday, 26 January 2000 13:18
> To: aussie-weather at world.std.com
> Subject: aus-wx: USA Winter?
>
>
> Hey, anyone got more info on the USA weather, particularly their
> apparent cold snap (according to the news) that reached the more
> southern states? Heard they had some unusual snow/ice storms
> down south.
>
> Leslie R. Lemon? Others?
>
>
> Hope I haven't gone too far off the Aussie-wx track with this USA
> enquiry...
>
>
> Lindsay Pearce
>
>
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> -----------------------jacob at iinet.net.au---------------------
> ---------
>
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005
From: Lyle Pakula [LyleP at oakton.com.au]
To: "'aussie-weather at world.std.com'" [aussie-weather at world.std.com]
Subject: RE: aus-wx: Sunshine..Woohooo !!!
Date: Thu, 27 Jan 2000 10:05:51 +1100
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> You can say that again - so far, 0-1 days above 35 and 5-7 above 30
> (I only have rounded figures, which include 1 35 and 2 30s, hence the
> uncertainty). There have been several summers in which it has failed
> to reach 35 (most recently 1995-96). IIRC the lowest number of days
> over 30 is 6, but I'll check this.
>
> Melbourne has also had a shortage of really hot days (nothing yet
> over the old 100 F/37.8 C), but has had two long spells of 30+ days,
> as has Adelaide - classic La Nina conditions.
>
> Blair Trewin
interestingly, 96 was a good snow year..here's hoping :0
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006
From: "Jane ONeill" [cadence at rubix.net.au]
To: "Aussie Weather" [aussie-weather at world.std.com]
Subject: aus-wx: MSC's first webcam funnel chase
Date: Thu, 27 Jan 2000 11:55:27 +1100
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After the successful capture of a cg on Omni net's Melbourne webcam last
year, we now have our first webcam funnel chase, written up courtesy of Les
Crossan from the UK.......
http://www.rubix.net.au/~cadence/21_1_00.htm
At the moment, until I get around to redesigning the front page of MSC
because we're up to the Year 2000, I'm putting all site updates on the
What's New page at:
http://www.rubix.net.au/~cadence/wotznu.htm
Jane ONeill
Victoria
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007
From: "mbath at ozemail.com.au" [mbath at ozemail.com.au]
To: [aussie-weather at world.std.com]
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Date: Thu, 27 Jan 2000 01:17:30 "GMT"
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Subject: aus-wx: Lithgow chase
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Jimmy and Mario are currently at Lithgow (12.15pm) and would appeciate radar or satpic updates during the afternoon.
Currently there are some showers to their N and NE, but they are hoping for action to the W and NW.
Jimmy's mobile is 0408 020 468
regards,
Michael Bath
__________________________________________________________
Message sent by MyMail http://www.mymail.com.au/
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008
Date: Thu, 27 Jan 2000 13:47:57 +1100
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: An interesting weekend!
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Blair Trewin wrote on Mon, 24 Jan 2000 11:43:42 +1100 (EST):
>
> A very interesting weekend for Australian meteorological devotees!
>
> It looks as if a new Australian record low has been established for
> January. Thredbo Village reported -8.0 yesterday, and Crackenback
> -6.0 today. The Village report I regard with some scepticism, as it
> is somewhat lower than others in favoured locations in the region
> (-3.1 at Charlottes Pass - which got -5.4 today), but not enough to
> dismiss it out of hand, especially as it is more sheltered from the
> wind in that situation than Charlottes Pass is. The Crackenback
> obs looks legitimate. Both readings would be below the existing
> record of -5.6.
Blair,
I would be very reluctant to dismiss the Thredbo Village Obs
though the dewpoint officially recorded does seem too high.
I monitored the weather very closely while I was in Perisher
Valley. There was a light wind aloft that would keep those
"frost hollows" at higher elevations warmer than expected.
If it was dead calm, then places like Charlottes Pass and
Perisher Valley chill down more. A light wind aloft keeps
Thredbo Village dead calm and much colder from my experience
of the area. You'll notice this also occurs on occasion
during the winter, particularly in the early and later
parts of the season while limited or no snow lies on the
ground.
For interests sake, Technology Lodge (1805m) recorded the
following obs;
==========================================================
Day/date/1500 Min Max Average Obs (to 3pm)
----------------------------------------------------------
FRI 21/01/2000 +4.8 +10.4 W/NW at 15KT,3CLD,0MM
SAT 22/01/2000 +1.5 +8.2 NW/W/SW at 15KT,4CLD,0MM
SUN 23/01/2000 -3.5 +7.5 W/SW at 5-10KT,6CLD,0MM
MON 24/01/2000 -5.0 +12.0 SW at 15KT,7CLD,0MM
TUE 25/01/2000 +1.8 +11.5 SW/S/E/NE at 5KT,7CLD,0.5MM
==========================================================
Temps are recorded by the air-condition intake duct that
keeps records for a period as desired. It needs to do this
in order to reduce or increase the number of heating
elements operating. Outlet temperature cannot exceed 40C,
so it is important to ensure that this is never exceded.
Other obs are my own done manually and estimated by
watching the clouds.
My only challenge is that on SUN 23/01/2000, official
obs for Perisher quote a max of 12.8 which could only
have occured due to localise heating during a calmer
period. There were large trucks going up and down the
road less than 7m from the screen repairing water pipes
just below Technology. We found this out after our
water was cut off without warning. One can imagine
that the hot air and exhaust from these trucks so
close could have a localised adverse affect on the
maximum temperature recorded.
Unfortunately, no snow at Perisher:-( However, it was
very cold working outside due to the wind-chill. The
temperature also took a long time to climb towards its
maximum.
[snip]
Michael Scollay mailto:michael.scollay at telstra.com.au
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009
Date: Thu, 27 Jan 2000 14:59:37 +1100
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: Archives
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Hi Kevin,
I can echo Laurier's sentiments about archives. If only
ASWA people could get back through the Telstra firewall
and log into the apache http server than runs on my machine,
then they could pick up what they want, reliably and when
they want without me having to package it up for them:-)
I want ASWA to set up a permanent archive that is accessible
by members along these lines.
That said...I am servicing outstanding requests but some
"work" comes first...I am yet to fully automate archive
retrieval. Stay tuned AC! We'll get that SN out yet:-)
Background: My archive puts away all MSL, radar (30 sites
or as required), and satpics (NPMOC gmsd, gmsc and gmsfull)
that amounts to some 52MB per day. In excess of 2000 files
are created each day. Download rates average 50KB/s for
local BoM sites and 1-75KB/s for NPMOC. Uploads via ftp
to simplenet average 130KB/s!
Creating the archive involves using at least one of the
following techniques;
1) Download the same file then rename it e.g. radar
2) Selective mirror of a dir with or without file rename.
e.g. NPMOC jtwc gmsfull
3) Full mirror of a dir with or without rename.
4) Retrieval and reprocess multiple files e.g SILO Obs,
READY meteograms and maps, GASP maps etc.
All of this is done automatically in my case by using
a combination of cron operation, sh (shell) and perl
scripts. This includes the smarts to avoid duplicate
download, repeat unsuccessful downloads after a back-off
period and also mirror recovery.
As some hints, there are two ways of servicing an archive;
1) Individual image(s).
2) Compression or animation (zip or multi-frame gif).
File-renaming is a must. All my archive stuff is stored
as "/YYYYMMDDHHMM.jpg|gif|txt" etc. ""
is either; radar//, gmsc, gmsd, gmsfull, msla etc.
Browsability is important also. If you set up a CGI
front-end nicely, then the structure behind can be
arbitrary. In practice, however, the archive might need
to be accessed both through CGI or as a direct http/ftp
download. This means a regime to limit the number of
files in a particular dir is important.
1) Radar: 1 day or 144 images max.
2) MSL: 6 days or 36 images max.
3) Satpics: 4 days or 92 images max.
To maintain these browsability limits, a script operates
every 24 hours that removes all duplicate files and any
files that fail a particular size criteria then compresses
these into a tar file and further compresses this using
gzip. The resultant file is stored using the format
"~/archive//YYYYMMDD.tar.gz". The "tar + gzip"
combination achieves some 3% more compression than zip.
As you could appreciate, there are hundreds of identical
file names so the distinction is achieved using directory
naming instead. It's easy to clobber files if you are not
careful! Hence, the majority of archive access and
retrieval that I do contains in-built checks to avoid
this sort of disaster.
As a final archive step, since disk space is limited,
I need to move these archived "tar.gz" files to 4mm DAT
tape. This is done every 10 days. There are also scripts
for searching and retrieving any file from the tape
archive. As a further backup, standard tape backup
software runs every night over the entire file system.
Presently, to service archive requests, I need to identify
the required images, perhaps crop and reprocess these then
package the images in a zip archive ready to ftp to a final
retrieval site (simplenet). Most of the steps are automated
now with the most time-consuming task being to decide the
cropping dimensions, the time-span of images and the
logging of the request. An ultimate goal of a mature
archive product would be to automate this via a java/cgi
front-end. That's doable, but a lot of work that is only
worth it once ASWA has its own archive server.
Hope it helps!
Michael Scollay mailto:michael.scollay at telstra.com.au
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010
Date: Thu, 27 Jan 2000 15:37:17 +1100
From: Ben Quinn [bodie at flatrate.net.au]
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To: aussie-weather at world.std.com
Subject: aus-wx: Webcam
Sender: aussie-weather-approval at world.std.com
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Hi Everyone,
Nathan Thompson from SA found this webcam for Brisbane this morning -
and it's a pearler.. i'm not 100% sure what direction it's facing, but i
think it's either W or NW.. it updates every minute too!
http://www.citimark.com.au/petriepoint/webcam/
Bugger all on it at the moment - i doubt if there will be much in
Brisbane until very late tonight/overnight.. a reasonable line of
development over inland southern QLD and northern NSW on the sat pics
now, hopefully it will make it to the coast overnight..
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011
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Date: Thu, 27 Jan 2000 17:10:54 +1100
To: aussie-weather at world.std.com
From: Miguel de Salas [mm_de at postoffice.utas.edu.au]
Subject: aus-wx: Webcams please?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
Is there a page somewhere on the web with a list of links to Australian
webcams that are good for weather watching?
If so, could anyone with any links not in that page please post them to
this list?
Also, if not, could anyone with links please post them here, or if that has
been done very recently (I don't wanna waste space), could you email them
to me direct? (mm_de at postoffice.utas.edu.au)
Thanks!
Miguel de Salas
School of Plant Science,
University of Tasmania,
PO Box 252-55, Sandy Bay, Hobart
Tasmania, Australia, 7001.
mailto://mm_de at postoffice.utas.edu.au
My Moths Page:
http://members.xoom.com/migueldes/moths/moths.html
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012
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Date: Thu, 27 Jan 2000 17:41:50 +1100
To: aussie-weather at world.std.com
From: Matt Smith [disarm at braenet.com.au]
Subject: Re: aus-wx: Webcams please?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
http://www.iinet.net.au/~kevinr1/Livecams.html
List of all aussie web cams..
Matt Smith
>Is there a page somewhere on the web with a list of links to Australian
>webcams that are good for weather watching?
>
>If so, could anyone with any links not in that page please post them to
>this list?
>
>Also, if not, could anyone with links please post them here, or if that has
>been done very recently (I don't wanna waste space), could you email them
>to me direct? (mm_de at postoffice.utas.edu.au)
>
>Thanks!
>
>Miguel de Salas
>
> School of Plant Science,
> University of Tasmania,
> PO Box 252-55, Sandy Bay, Hobart
> Tasmania, Australia, 7001.
>
>mailto://mm_de at postoffice.utas.edu.au
>
>My Moths Page:
>http://members.xoom.com/migueldes/moths/moths.html
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> -----------------------jacob at iinet.net.au------------------------------
>
>
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013
Date: Thu, 27 Jan 2000 18:14:14 +1100
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: USA Winter?
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
[snip heaps]
If you want the world's most stable weather with possible
snow any time of year in the higher parts, just head off
to Macquarie Island! Blair can correct me with a more
precise quote but I've seen the range +2C to +7C in any
season of the year. Rarely does it go below freezing,
though I have seen a -4C and rarely does it go above +10C.
Basically, it rains, drizzles or snows lightly almost
every day of the year...Great weather for seals, sea birds
and penguins, no doubt:-) Oh, I forgot, it's also windy...
Michael Scollay mailto:michael.scollay at telstra.com.au
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014
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Thu, 27 Jan 2000 18:33:52 +1100
Subject: Re: aus-wx: USA Winter?
From: "Mark Hardy" [mhardy at magna.com.au]
To: aussie-weather at world.std.com
Sender: aussie-weather-approval at world.std.com
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So that would make it a windsurfers paradise then!
Mark Hardy, TWC
----------
>From: Michael Scollay
>To: aussie-weather at world.std.com
>Subject: Re: aus-wx: USA Winter?
>Date: Thu, 27 Jan 2000 18:14
>
> Great weather for seals, sea birds
> and penguins, no doubt:-) Oh, I forgot, it's also windy...
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015
Date: Thu, 27 Jan 2000 18:40:29 +1100
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: Forgive me.....one more please....models.....
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"Leslie R. Lemon" wrote on Tue, 25 Jan 2000 12:46:24 -0500:
>
> Please forgive me. Allow me to post this...
[snip]
> 12Z MON MDLS VALID FOR 12Z TUE WERE THE MOST HORRIBLE I
> HAVE SEEN IN MY 10 YRS IN THE NWS. NOT ONE OF THE 3 MAIN
> MDLS FCSTD ANYTHING NEAR WARNING CRITERIA FOR THE DCA
> AREA. OBVIOUSLY WE HAVE WELL EXCEEDED WARNING CRITERIA...
[snip]
Your forgiven, Les:-) Correct me please, if I am wrong,
but did this model stuff-up also synchronise with the
increase in AVN/MRF model resolution announced?
Further, the BoM can take heart with this after they
were hauled over the coals concerning forecasts for
the 1998/9 Sydney-Hobart race, which I thought they
handled particularly well and the April 14, 1999
Sydney supercell hail storm which, well, caught them
by surprise and still has the BoM eating humble pie:-(
Will the NWS/NCEP be more closely examined or will the
event be considered an "act of God", hence out-of-bounds
for political and media finger-pointing exercises?
Michael Scollay mailto:michael.scollay at telstra.com.au
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016
Date: Thu, 27 Jan 2000 19:00:40 +1100
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: Possible Australian January record low
Sender: aussie-weather-approval at world.std.com
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Blair Trewin wrote on Mon, 24 Jan 2000 18:22:02 +1100 (EST):
>
> An update on my post this morning.
>
> The Thredbo Village -8.0 from yesterday is definitely
> wrong - it appears that the observer read the wrong end
> of the index (suggesting a true minimum of around -1,
> which seems more like it).
Oops...that'll teach me to search messages by author
as well as subject more carefully:-) Geez Blair, I'm
still surprised that the Thredbo Village obs wasn't
lower...it seems too hard to believe that an observer
can make such a mistake during a critical obs such as
this. Perhaps he/she also thought that such an obs was
just too good to be true...Do they keep a temperature
graph or just record max/min in the conventional way?
Anyhow, what our duct at Technology Lodge in Perisher
Valley recorded is reliable at -5.0C during that same
period.
Michael Scollay mailto:michael.scollay at telstra.com.au
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017
Date: Thu, 27 Jan 2000 21:26:09 +1000
From: Dean S [deansgar at alphalink.com.au]
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To: Aussie-weather [aussie-weather at world.std.com]
Subject: aus-wx: CAPE
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Hey all,
I realize that you may have already explained this to numerous
people before. However, I am still confused on what exactly CAPE is and
as of how exactly CAPE is derived and calculated from the Upper Level
Atmospheric Analysis figures. I have attempted to solve this problem
solely on my own. However, all attempts proved to be fruitless. Perhaps
you guys could help me for a majority of you are familiar with such
thermodynamics, hydrostatics and atmospheric stability. I do know that
CAPE is a measurement of how stable the atmosphere is, (I think). Is
this correct? Any help at all would be deeply appreciated and extremely
helpful in my ongoing studies to better understand atmospheric
properties. Thankyou very much for your time.
Dean AL Sgarbossa
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018
Date: Thu, 27 Jan 2000 21:31:08 +1000
From: Dean S [deansgar at alphalink.com.au]
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To: aussie-weather at world.std.com
Subject: Re: aus-wx: Webcams please?
Sender: aussie-weather-approval at world.std.com
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Hey all again,
Below is a link to an A-Z listing of Australian Web Cams. I
haven't gone through all of them as of yet. However, the ones that I
have viewed appear to be very useful to the weather watcher and
observer. Good luck.
Deano
Matt Smith wrote:
>
> http://www.iinet.net.au/~kevinr1/Livecams.html
>
> List of all aussie web cams..
>
> Matt Smith
>
> >Is there a page somewhere on the web with a list of links to Australian
> >webcams that are good for weather watching?
> >
> >If so, could anyone with any links not in that page please post them to
> >this list?
> >
> >Also, if not, could anyone with links please post them here, or if that has
> >been done very recently (I don't wanna waste space), could you email them
> >to me direct? (mm_de at postoffice.utas.edu.au)
> >
> >Thanks!
> >
> >Miguel de Salas
> >
> > School of Plant Science,
> > University of Tasmania,
> > PO Box 252-55, Sandy Bay, Hobart
> > Tasmania, Australia, 7001.
> >
> >mailto://mm_de at postoffice.utas.edu.au
> >
> >My Moths Page:
> >http://members.xoom.com/migueldes/moths/moths.html
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> > message.
> > -----------------------jacob at iinet.net.au------------------------------> >
> >
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> message.
> -----------------------jacob at iinet.net.au------------------------------
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019
From: "Paul Mossman" [paulmoss at tpgi.com.au]
To: aussie-weather at world.std.com
Date: Thu, 27 Jan 2000 20:08:46 +0930
Subject: aus-wx: 3 TC's now going / At long last another Great Storm
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Howdy all.
3 TC's going now - Connie, Jo & TC 09S (off WA).
Great storm here to the South near mandoorah tonight - lightning
still lighting up at night sky. Great squall line - which I managed to
get saved from Radar.
Also got some pics......woohhoo.
Paul.
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020
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Thu, 27 Jan 2000 21:48:38 +1100
Subject: aus-wx: Alice Springs humidity
From: "Mark Hardy" [mhardy at magna.com.au]
To: Weather Junkies [aussie-weather at world.std.com]
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com
You've got to be feeling for the poor folk in Alice Springs. They are not
terribly used to high humidity and lately it's been shocking. The past few
days has seen temperatures of 38, 39 degrees with dewpoints of 22. That's
pretty uncomfortable. They had a cool change today dropping the temperature
to 22 but the dewpoint has stayed up around 20. And with all that moisture
around, they seem to have missed out on most of the storms that have been
passing through the area. Next few days should see dewpoints drop as the
cooler air from SA gather more penetration.
MH
_____________________________________________________
Mark Hardy.
Weather 21
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
email: markh at weather21.com.au
_____________________________________________________
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021
X-Mailer: Microsoft Outlook Express Macintosh Edition - 4.5 (0410)
Date: Thu, 27 Jan 2000 22:16:34 +1100
Subject: Re: aus-wx: CAPE
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
Dean
CAPE or Convective Available Potential Energy.
Yes, it is a measure of stability but it is more accurate to think of it as
potential energy. You may have heard of potential energy in your high school
physics class in terms of the energy bound up in a compressed spring or the
gravitational potential energy of a ball at the top of a ramp. CAPE is no
different but the energy source is not from gravity or the coils of a spring
but the thermodynamic (heat) energy in the atmosphere by water vapour. To
more clearly understand this you need to appreciate that to evaporate water
into the atmosphere requires energy. When the invisible water vapour
condenses and forms clouds, this energy is released. This is the basis of
CAPE. The energy released heats the air and makes it more buoyant. It rises
into a cooler environment. Further condensation can release more energy
etc..
The existing stability and the amount of moisture in the lower levels are
the biggest factors in the CAPE calculation. If the atmosphere is unstable
and there is a lot of moisture in the lower levels, then the CAPE will be
very high. The important feature of the CAPE figure is that is gives an
indication of the speed of the updrafts in a storm cloud. The higher the
CAPE, the more energy will be converted into buoyancy then vertical
velocity. The speed of the updrafts is a big factor in thunderstorm
severity.
Hope this helps,
_____________________________________________________
Mark Hardy.
Weather 21
Level 2, 7 West Street, North Sydney 2060
Ph (02) 9955 7704. Fax (02) 9955 1536.
email: markh at weather21.com.au
_____________________________________________________
----------
>From: Dean S
>To: Aussie-weather
>Subject: aus-wx: CAPE
>Date: Thu, 27 Jan 2000 22:26
>
> Hey all,
> I realize that you may have already explained this to numerous
> people before. However, I am still confused on what exactly CAPE is and
> as of how exactly CAPE is derived and calculated from the Upper Level
> Atmospheric Analysis figures. I have attempted to solve this problem
> solely on my own. However, all attempts proved to be fruitless. Perhaps
> you guys could help me for a majority of you are familiar with such
> thermodynamics, hydrostatics and atmospheric stability. I do know that
> CAPE is a measurement of how stable the atmosphere is, (I think). Is
> this correct? Any help at all would be deeply appreciated and extremely
> helpful in my ongoing studies to better understand atmospheric
> properties. Thankyou very much for your time.
>
> Dean AL Sgarbossa
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> To unsubscribe from aussie-weather send e-mail to:majordomo at world.std.com
> with "unsubscribe aussie-weather your_email_address" in the body of your
> message.
> -----------------------jacob at iinet.net.au------------------------------
>
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| Document: 000127.htm
Updated: 30 January 2000 |
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