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Date: Wed, 23 Sep 1998 05:23:40 +0800
To: aussie-weather at world.std.com
From: Jacob 
Subject: aussie-weather: New Perth September Record
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Hi all, 

Its just after 5am here, and the Perth City site just hit a new September
record of 2.2C, might get even lower than that still with about another
hour till sunrise, the old record was 2.3C recorded back on the 3rd
September, 1994.

Met Observations for Perth
Bureau of Meteorology, Perth
Issued at 0505 on 23/09/1998.
----------------------------------------------------------------
CODE       STATION             CURRENT OBS (within last hour)
                                    Temp  Dew Pt   Wind    Press
                                   deg C  deg C   dir spd   hPa
                                                       Kn
----------------------------------------------------------------
PERT       PERTH CITY                2.2    1.7   000 000   1025
YPPH       PERTH AIRPORT             2.7    2.2   020 002   1024
YRTI       ROTTNEST ISLAND           9.0    3.0   090 009   1023
YPJT       JANDAKOT AIRPORT          1.1    1.1   100 004   1025
MDU        MANDURAH                  3.6    3.2   090 004   1024
----------------------------------------------------------------

Jacob

--------------------------------------------------------------------------------------

From: "Jane ONeill" 
To: "Aussie Weather" 
Subject: aussie-weather: Warmest Melbourne night in 11 years
Date: Wed, 23 Sep 1998 07:51:23 +1000
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21.6 when I got up at 5.45am.

Gusty NW wind, 8/8 Cu / Sc, front due through late morning.  Isolated storms
expected.
Ah, spring!!

Temperatures for Melbourne Bureau  of Meteorology,
Melbourne Issued at 0736 on 23/09/1998

CODE       STATION                  CURRENT TEMPERATURE  [within last hour]
----------------------------------------------------
YMML       MELBOURNE AP             19.3
MELB       MELBOURNE CITY          20.2
DUNN      MT DANDENONG           14.9
YMMB      MOORABBIN                  19.7
FRAN       FRANKSTON                  18.4
CERB       CERBERUS                      19.8
YLVT        LAVERTON                     19.8
GROV       GEELONG AP                   18.9

Jane ONeill

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From: Blair Trewin 
Subject: aussie-weather: Heavy rain in NE Victoria and northern Tasmania
To: aussie-weather at world.std.com (Aussie Weather)
Date: Wed, 23 Sep 1998 14:36:45 +1000 (EST)
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Some very impressive rainfall totals in the 24 hours to 0900
in north-eastern Victoria and northern Tasmania.

NE Victoria: 195 at Mount Buffalo, and quite a few other 
readings over 100 in the highlands (Whitlands 110, Lake William
Hovell 118, Falls Creek 103). Falls Creek had recorded another 
49mm in the period 0900-1400 last time I checked.

Northern Tasmania: 118 at Meander, 80 Devonport, 76 Deloraine,
53 Launceston.

The Meander and Devonport figures are all-time 24-hour records 
for the sites concerned. I doubt if any of the Victorian ones
are, given the totals in the October 1993 event, but I haven't 
checked.

Not surprisingly, there is significant flooding developing on 
all the rivers with their catchments in this area. The Ovens at
Wangaratta is expected to approach its 1993 level, which surprises
me - the totals aren't as big and I thought the catchments were
drier (plus there isn't a lot of snow left to melt).

Also some good totals through eastern SA/western Victoria overnight,
widely over 25mm with the odd 50. Melbourne missed out more or less
completely on that lot (0.6), but we have picked up 6 with the 
front today.

There wasn't much snow around before this event started and there
certainly won't be now (even at Falls Creek and Hotham temperatures
have been around 7-8 C) - maybe WA will have the only snow left in
Australia?

Blair Trewin
National Climate Centre, Bureau of Meteorology/School of Earth 
Sciences, University of Melbourne

--------------------------------------------------------------------------------------

From: Blair Trewin 
Subject: aussie-weather: Re: New Perth September record
To: aussie-weather at world.std.com (Aussie Weather)
Date: Wed, 23 Sep 1998 14:43:58 +1000 (EST)
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Jacob wrote:

>Hi all, 

>Its just after 5am here, and the Perth City site just hit a new September
>record of 2.2C, might get even lower than that still with about another
>hour till sunrise, the old record was 2.3C recorded back on the 3rd
>September, 1994.

Worth noting here that the Perth City site moved in 1992 and the new
site is significantly colder than the old one on this type of night,
so it's perhaps not quite as significant a mark as it might seem -
still a cold one though. I haven't done the calculations for 
September, but estimated a while back that the City record for any
month of 1.2 C equated to somewhere between -1.0 and -0.5 at the 
new site; I imagine a similar differential would exist in September.

(Interestingly, it is only in the lowest 30 percentile of the 
frequency distribution that any significant difference shows up
between the two sites - on the warmer nights their temperatures are
very similar).

At Perth Airport there is only colder night than last night so late
in spring (1.6, 30/9/1944). They have been down to -0.6 in September,
although urbanisation has taken its toll since then.

Blair Trewin
National Climate Centre, Bureau of Meteorology/School of Earth 
Sciences, University of Melbourne

--------------------------------------------------------------------------------------

X-Sender: jacob at iinet.net.au
Date: Wed, 23 Sep 1998 14:21:55 +0800
To: aussie-weather at world.std.com
From: Jacob 
Subject: Re: aussie-weather: Re: New Perth September record
Sender: aussie-weather-approval at world.std.com
Reply-To: aussie-weather at world.std.com

At 02:43 PM 23-09-98 +1000, you wrote:
>Jacob wrote:
>
>>Hi all, 
>
>>Its just after 5am here, and the Perth City site just hit a new September
>>record of 2.2C, might get even lower than that still with about another
>>hour till sunrise, the old record was 2.3C recorded back on the 3rd
>>September, 1994.
>
>Worth noting here that the Perth City site moved in 1992 and the new
>site is significantly colder than the old one on this type of night,
>so it's perhaps not quite as significant a mark as it might seem -
>still a cold one though. I haven't done the calculations for 
>September, but estimated a while back that the City record for any
>month of 1.2 C equated to somewhere between -1.0 and -0.5 at the 
>new site; I imagine a similar differential would exist in September.
>
>(Interestingly, it is only in the lowest 30 percentile of the 
>frequency distribution that any significant difference shows up
>between the two sites - on the warmer nights their temperatures are
>very similar).
>
>At Perth Airport there is only colder night than last night so late
>in spring (1.6, 30/9/1944). They have been down to -0.6 in September,
>although urbanisation has taken its toll since then.
>
>Blair Trewin
>National Climate Centre, Bureau of Meteorology/School of Earth 
>Sciences, University of Melbourne

Yep, thats right, since the "city" site moved to the nearby inner city
suburb of Mt Lawley, which is about 2km away, it has recorded colder
temperatures on these type of nights.

Since the new Mt Lawley site opened in 1993, we've broken the all time
record in July in 1997 then tied it again this year, the August record in
1997, the September record in 1994 and now again this year, and the October
record in 1994.

When these records had been broken the media here don't take any note that
the recording station moved to a new area, they just say its a new record
for Perth and thats it, for instance in a news break this afternoon they
said "Perth had its coldest September temperature on record this morning".
They will have a report about it on the main news tonight I'm sure, without
noting that the new site is slightly colder on these type of nights.

Also interesting to note that we have also came close to breaking the
warmest July and August temperatures at the new site, 25.8 on the 21/7/1994
(record 26.3 in 1976), and 27.2 on the 26/8/1998 (record 27.8 in 1940).

However, daytime maximum temperatures, and summer temperatures have shown
similar averages to the old city site, unlike winter minimums which have
shown colder temperatures.

Also, just to confirm that the temperature in Perth City got down to 1.8 at
5:50am this morning.

Jacob

--------------------------------------------------------------------------------------

Date: Wed, 23 Sep 1998 18:20:36 +1000 (EST)
From: Paul Graham 
To: aussie-weather at world.std.com
Subject: aussie-weather: Weather Update...
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What might be a line of thunderstorms has popped up over the past hour or
so near Wagga Wagga and is moving east towards the ACT.  There have been
persistent indications of moderate to heav precipitation on the radar of
NE Victoria all afternoon and correspondingly cool cloud tops showing on
satellite imagery of the region. 
- Paul.

--------------------------------------------------------------------------------------

From: "Michael Thompson" 
To: 
Subject: Re: aussie-weather: Weather Update...
Date: Wed, 23 Sep 1998 19:54:41 +1000
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I see what you mean, but will the storms carry over to the coast, that patch
in far east gippsland gives me some small hope, not directly from it, but in
that all action isn't west of the ranges.

You ought to have seen the radar for South Australia last night, now that
was the place to be !

Regards
Michael


>What might be a line of thunderstorms has popped up over the past hour or
>so near Wagga Wagga and is moving east towards the ACT.  There have been
>persistent indications of moderate to heav precipitation on the radar of
>NE Victoria all afternoon and correspondingly cool cloud tops showing on
>satellite imagery of the region.
>- Paul.