X-Sender: hdewit at postoffice.sa.bom.gov.au
Date: Fri, 30 Oct 1998 09:47:14 +1000
To: aussie-weather at world.std.com
From: Hank de Wit 
Subject: Re: aussie-weather: Weather and Tides
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

At 17:10 29/10/98 -0800, Bodie wrote:
>I was wondering if there is any link between Tides and the weather??

I don't know if there is any way that the tides can directly effect the
weather, however there is a similar tidal phenomena in the atmosphere
itself. The Atmospheric tides are synchonised with the sun, rather than the
moon as the atmospheric tides are caused by solar heating of the
atmospheric column rather than differential gravitational attraction as in
the traditional tides. The atmospheric tides produce semi-diurnal pressure
variations (ie two highs and two lowes per day) of the barometer of about
+/- 1-2hPa. There is a 'local solar' pressure high at 10am and 4pm, and a
low at 10pm and 4am. The 10am and 4pm varitions are the more extreme. The
actual size of the atmospheric tides varies with latitude and distance
inland and altitude of the site. In the tropics which have small dynamic
pressure varitations the semi-diurnal pressure changes are dominant. It is
likely that daily variations in convection are influenced by the
semi-diurnal pressure changes, I think there is supposed to be a late
morning peak in shower activity on average in some tropical locations.

The reverse question, does the weather effect the tides has a definite YES
answer. The atmospheric pressure can raise and lower the tide by quite a
bit. In SA's St Vincent Gulf we use a relation of 1hPa pressure fall = 1cm
rise, though I think this might be more general. In addition the wind
causes the sea to 'pile' up against the coast in what is termed a 'surge'.
This is significant with cyclones approaching the coast and can be enhanced
by the shape of the coast. Our SA gulfs because of their shape and
shallowness are significantly affected. Strong WNW winds at the time of
high tide can cause flooding problems at Port Adelaide, particularly is
associated with an intense low pressure system just to the SW.

Cheers
Hank
Weather Bureau
Adelaide

Hank de Wit
Regional Computer Manager
Bureau of Meteorology
South Australia
H.deWit at BoM.gov.au
ph: 08 8366 2674
http://www.sa.bom.gov.au/~hdewit (INTRANET access only)

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Date: Fri, 30 Oct 1998 11:00:04 +1100
Subject: Re: aussie-weather: Weather and Tides
From: "Mark Hardy" 
To: aussie-weather at world.std.com
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

It is well known that weather can affect tides - particularly pressure and
wind. Whether tides can affect weather...well.. that seems to be up for
debate. To my knowledge there is not much scientific literature around on
this topic. Some of you AMOS guys would know better though. However, I have
seen a few of cases of winds affected by tides and also received
considerable anecdotal evidence. Particularly relating tides and strengths
of seas breezes. To my knowledge there are several places around the country
where winds do "appear" to be affected by tides. By affected - I don't mean
an "apparent wind" effect which you may get in an estuary, but a real change
in wind.

The case which I have personally witnessed many times is on the south coast
of NSW. If there is a southwesterly blowing through Bass Strait, quite often
this will push a sea breezy kind of southeasterly onto the NSW South Coast
(Eden to Moruya). The strength of this southeasterly really does appear to
be dependent on the tides. If the tide is rising the southeasterly (on the
average) tends to be stronger than if the tide is falling. Whether this
effect is caused by local temperature and current variations or is a broader
scale tidal influence - I have no idea. However, it has fascinated me for
quite a few years.

I have heard of wind/tidal effects occurring in other parts of the country -
local fishermen and sailors everywhere will often have their own theories.

Mark
----------
>From: "Bodie" 
>To: 
>Subject: aussie-weather: Weather and Tides
>Date: Fri, 30 Oct 1998 12:10
>

>I was wondering if there is any link between Tides and the weather??

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From: "Nick Sykes" 
To: "aussie-weather" 
Subject: aussie-weather: Storm in Melbourne Today?
Date: Fri, 30 Oct 1998 12:09:05 +1100
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Hi all

Just had a quick look outside and saw some cumulus forming over the Melbourne area, wondering if anyone in Melbourne thinks there maybe a storm this afternoon? 

It's warm and mainly sunny with a moderate northerly at the moment.

Have'nt got access to the web at the moment, only e-mail, doh, so I haven't seen the latest forecasts.

Nick

Weather is all around you, fill it's force.

ICQ-19704370

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From: Blair Trewin 
Subject: aussie-weather: NT rainfall yesterday
To: aussie-weather at world.std.com (Aussie Weather)
Date: Fri, 30 Oct 1998 12:21:37 +1100 (EST)
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

Some reasonably impressive rainfalls in the NT yesterday, both
north (88mm at Larrimah) and south (82mm at the Garden). Alice
Springs got 27. (The Garden appears from co-ords to be ~80km NE
of Alice Springs). Falls were pretty spotty as one might expect 
in a thunderstorm situation.

Also some low maxima in SA - 15 at Woomera is getting close to late-
season record territory, although for October as a whole 20-21 October
1995 will take some beating. (This episode, which left a trail of
records stretching from Gabo Island to Marble Bar, was one of the
most remarkable and little-known, IMO, in Australian meteorological
history, probably because (a) it had little effect on any major
population centres (b) the most spectacular manifestation of it (snow
to 200m in the Flinders Ranges) happened on a Saturday afternoon when
there is little news coverage outside the big cities and (c) it didn't
kill anybody. Broken Hill and Yunta had their lowest maxima on 
record for any month - as October maxima both had estimated return
periods > 1000 years - and Marble Bar, whose previous October record
low minimum was 12.3, went under 10 on five successive nights).

Blair Trewin

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From: "Nick Sykes" 
To: "aussie-weather" 
Subject: aussie-weather: ICQ Numbers, great for urgent chat
Date: Fri, 30 Oct 1998 12:41:47 +1100
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Hi All

I thought it would be good if everybody on the Mailing list could post their ICQ numbers, great for chatting about weather and for urgent contacts if user on web.

To find out more about ICQ goto www.mirabilis.com

Nick

Weather is all around you, feel it's force.

ICQ-19704370

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From: "McDonald" 
To: 
Subject: aussie-weather: Melbourne weather.
Date: Fri, 30 Oct 1998 12:45:18 +1100
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Hi everyone,
	      Did/can any of the melbournians see that line of Cu clouds
thickening as the move further E/SE.  They seem to be pretty well capped
but may get a bit better.  Perhaps a bit of a trough forming before the
front which is due later today/tonight.  Any comments?

Andrew McDonald.

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From: "Jane ONeill" 
To: "Aussie Weather" 
Subject: aussie-weather: ICQ
Date: Fri, 30 Oct 1998 12:49:20 +1100
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ICQ No: 4496048
(answer it when I see it but I usually have the taskbar hidden)

Jane
Melbourne

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From: "Nick Sykes" 
To: "aussie-weather" 
Subject: aussie-weather: Digital Camera for weather pics
Date: Fri, 30 Oct 1998 13:56:03 +1100
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Hi all

I'm interested in buying a digital camera so I can post weather pics on the web, can anyone reccommend a good (pretty cheap), digital camera for taking cloud shots etc.

Nick

Weather is all around you, feel it's force.

ICQ-19704370

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From: "Jane ONeill" 
To: "Aussie Weather" 
Subject: aussie-weather: ICQ
Date: Fri, 30 Oct 1998 12:49:20 +1100
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ICQ No: 4496048
(answer it when I see it but I usually have the taskbar hidden)

Jane
Melbourne

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From: disarm at braenet.com.au
X-Sender: disarm at braenet.com.au (Unverified)
Date: Fri, 30 Oct 1998 15:02:58 +1100
To: aussie-weather at world.std.com
Subject: aussie-weather: ICQ #
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

My icq number is 3890080
cheers
Matt Smith from sydney.

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X-Sender: jacob at iinet.net.au
Date: Fri, 30 Oct 1998 12:57:59 +0800
To: aussie-weather at world.std.com
From: Jacob 
Subject: aussie-weather: Its about time, Perth gets some heat!
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com


It looks like we may get to 30C for the first time thing spring today,
currently in Perth City at 12:50pm WST (3:50pm EDT) its 29.3C, with NE
winds at 12km/h, dew point is 12.4C and 1016.1 hPa.

Tomorrow is expected to be even hotter.

FORECAST FOR METROPOLITAN AREA
Issued at 1150 hours on   Friday , 30/10/98
ISSUED BY THE BUREAU OF METEOROLOGY PERTH
FOR THE REST OF TODAY AND TOMORROW.
At  11.00am the temperature was 27.1 degrees Celsius.

PERTH AND METROPOLITAN:
Fine. Warm today, hot tomorrow.
Winds shifting NE'ly tonight after the sea breeze.

 TOMORROW'S TEMPS:  MIN: 17. MAX: 34.

Jacob

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From: "Ben Tichborne" 
To: 
Subject: aussie-weather: Greetings from stormy New Zealand
Date: Fri, 30 Oct 1998 17:51:15 +1300
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Hi everybody

 Some interesting storms over Australia recently. Here in New Zealand we
are nearly at the end of a very stormy month as well. Residents of the
northwestern South Island (Buller) and southwestern North Island (Kapiti,
Wanganui, Taranaki, and King Country) have been suffering record October
rainfalls which have flooded farms and homes, while numerous slips have
blocked roads (including some major highways). The last of these storms
departed only yesterday.

Here in Christchurch things haven't been nearly so dramatic, but we have
had above average rainfall for the first time since August 1997. We have
also had 3 separate thunderstorms this month - very unusual for the city -
though only one of them could  remotely be described as spectacular.

I hear there have been some unseasonably late snowfalls in parts of
southeastern Australia. On 22/23 October a very cold southwesterly outbreak
swept over southern New Zealand, bringing snow to low-levels (settling to
about 200 metres). Pity the snow hadn't come earlier, since the last of the
ski-fields had closed about a week earlier, due to lack of snow!.

Outside the Internet, we don't hear much about Aussie weather in NZ, except
for the really big storms (there have been a few of them lately). A pity,
because a lot of Aussie storms do travel over the Tasman to affect NZ, even
if they change their nature significantly.

Regards
Ben Tichborne

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From: Paul_Mossman at agd.nsw.gov.au
X-Lotus-Fromdomain: NSW_AG
To: aussie-weather at world.std.com
Date: Fri, 30 Oct 1998 16:05:20 +1000
Subject: Re: aussie-weather: Its about time, Perth gets some heat!
Content-Disposition: inline
Sender: aussie-weather-approval at world.std.com
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Wish we had some heat here!! Its about 19c and raining!! Yuk!!

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From: "dpn" 
To: 
Subject: aussie-weather: ICQ
Date: Fri, 30 Oct 1998 16:46:29 +1100
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Hi Dane from Melbourne. ICQ is 10266685.

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From: Blair Trewin 
Subject: Re: aussie-weather: Greetings from stormy New Zealand
To: aussie-weather at world.std.com
Date: Fri, 30 Oct 1998 16:54:44 +1100 (EST)
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> 
> Outside the Internet, we don't hear much about Aussie weather in NZ, except
> for the really big storms (there have been a few of them lately). A pity,
> because a lot of Aussie storms do travel over the Tasman to affect NZ, even
> if they change their nature significantly.
> 
We hear even less about NZ weather in Australia (and unlike most
evils to do with NZ meteorology we can't blame the privatisation of
the NZ Met. Service for it - we didn't hear too much about it pre-
1990 either). This is a pity because it can often be very interesting,
certainly for fans of snow! Keep us posted...

The rest of my family spent three years in Wellington a few years
back and I spent bits of the summers in NZ, being there for some
very interesting weather: January 1994 (the NZ record 24-hour
rainfall: 647mm or thereabouts on the west coast of the South Island)
and New Year 1996/97 (two TC landfalls in a fortnight and snow to
400m in Canterbury) being the two that stand out.

There's a good NZ monthly climate summary posted to an internal 
mailing list at the Bureau; I'll see if I can get the author's OK
to repost to aussie-weather.

Blair Trewin

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Date: Fri, 30 Oct 1998 01:06:16 -0500
From: David Hart 
To: aussie-weather at world.std.com
Subject: Re: aussie-weather: Greetings from stormy New Zealand
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

On Fri, 30 Oct 1998, Blair Trewin wrote:

> 
> There's a good NZ monthly climate summary posted to an internal 
> mailing list at the Bureau; I'll see if I can get the author's OK
> to repost to aussie-weather.

An Idea: See if the author would like to subscribe to aussie-weather. I
have used that to get some info forwarded to US lists.

David Hart

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From: "paulmoss" 
To: 
Subject: aussie-weather: ICQ
Date: Fri, 30 Oct 1998 19:21:39 +1100
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Howdy all!!! Hope the weathers good for you..........

Heres my ICQ No. 9648244

Its a good place for chat and knowing who is on-line....I recommend it to
all list subscribers!! Join...its free!!

Paul.

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X-Sender: mbath at ozemail.com.au
Date: Fri, 30 Oct 1998 21:28:39 +1100
To: aussie-weather at world.std.com
From: Michael Bath 
Subject: Re: aussie-weather: Greetings from stormy New Zealand
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

Hi Ben,

There's a couple of nice NOAA14 images of the most recent intense low
pressure/storm moving into and over NZ:

http://www.rss.dola.wa.gov.au/noaaql/1998/OCT/28/M14_19720ql.jpg
http://www.rss.dola.wa.gov.au/noaaql/1998/OCT/29/M14_19734ql.jpg

regards, Michael

At 17:51 30/10/98 +1300, you wrote:
> Some interesting storms over Australia recently. Here in New Zealand we
>are nearly at the end of a very stormy month as well. Residents of the
>northwestern South Island (Buller) and southwestern North Island (Kapiti,
>Wanganui, Taranaki, and King Country) have been suffering record October
>rainfalls which have flooded farms and homes, while numerous slips have
>blocked roads (including some major highways). The last of these storms
>departed only yesterday.

*==========================================================*
 Michael Bath  Oakhurst, Sydney   mbath at ozemail.com.au
                 Australian Severe Weather
       http://australiansevereweather.simplenet.com/
*==========================================================*

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Date: Fri, 30 Oct 1998 21:49:11 +1100
Subject: Re: aussie-weather: ICQ
From: "Mark Hardy" 
To: aussie-weather at world.std.com
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

ICQ    20573543    Mark from Sydney

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From: "Matthew Piper" 
To: 
Subject: aussie-weather: ICQ
Date: Fri, 30 Oct 1998 22:12:44 +1100
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Hi Everybody,

My ICQ# is 22127536

Matthew

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From: "Bodie" 
To: 
Subject: Re: aussie-weather: Friday - Saturday storms
Date: Fri, 30 Oct 1998 21:53:39 -0800
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Did you know that the wettest place in the world is  Mawsynram in India,
where on average there is 11,873mm of rain each year.
Holy shit ....