 Sluggish
shower dowses SE Sydney |
| In an excellent demonstration
of how significant local events can occur in apparently benign weather situations,
nearly 100mm fell in a 3 hour downpour around Sydney's Botany Bay
this morning under the centre of a 1032hPa high pressure system. Little
Bay, on the ocean side of the La Perouse peninsula and 15km SSE of the
Sydney CBD, recorded 94mm in 3 hours to 8.10am, while stations to the north
and south received little or no rain.
Heavy showers began appearing on radar
off the coast to the east of the Royal National Park before midnight,
and made landfall south of Botany Bay around 3am. By 4am, a small cluster
of very heavy showers lay along the southern shore of Botany Bay and across
the La Perouse peninsula, with individual shower cells moving from the
southeast. Between 5 and 8am, these amalgamated into a small rain area
extending WNW to Sydney Airport and Bexley, which recorded around 30mm,
and tapering off to the north of Bankstown. However, heavy showers continued
to form around the coast near Little Bay, giving the automatic station
there 31, 37 and 21mm for the 3 hourly totals between 5 and 8am.
Although the area was under a strong high
pressure system and balloon traces from Sydney Airport indicated only
marginal instability, the wind from about 1km above the surface over the
area was a moist southeasterly undercut by a 15 to 20km/h katabatic or
overnight land breeze from the WNW. While it would need a more detailed
study to be sure of the cause of this unusual event, it seems likely that
a convergence zone developed off the coast between the cool land breeze
and the overall southeasterly flow, enhancing instability and producing
a very small area of strong uplift that moved only very slowly to the
WNW, while continuing to rebuild in the offshore convergence area until
the land breeze died out around 9am. Strong cumulonimbus development was
still evident over the area as late as 11am, one cell drifting across
Royal National Park and dropping 17mm in 15 minutes around 1.30pm.
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National
weather extremes for today
Data provided
by the Bureau
of Meteorology
Last updated at 03:40 EDST on 02/06/01
|
| Quality
control note: Data is not yet complete. It is as received in real time,
and may contain errors. See Explanation
of Extremes Pages for more information |
| Records
set this day (none known) |
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Todays highest rainfall
totals for the 24 hours to 9am. It includes the top 5 totals received,
and/or all reported falls of 50mm or more.
97.0 LITTLE BAY (THE COAST GOLF CLUB)
Sydney--east NSW
45.0 BAKERS BEND TM Warrego QLD
44.0 NORTHCLIFFE SW & S Coast WA
32.0 BEXLEY BOWLING CLUB Sydney--east NSW
28.0 SYDNEY AIRPORT AMO Sydney--east NSW
WESTERN AUSTRALIA
SW
& S Coast
44.0 NORTHCLIFFE
QUEENSLAND
Warrego
45.0 BAKERS BEND TM
NEW
SOUTH WALES
Sydney--east
97.0 LITTLE BAY (THE COAST GOLF CLUB)
32.0 BEXLEY BOWLING CLUB
28.0 SYDNEY AIRPORT AMO
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High rainfall for periods
of 6 hours or less.
WESTERN AUSTRALIA
Central
West
GERALDTON AIRPORT
13.2mm in 30 min to 01:00 26.4mm/h
NEW
SOUTH WALES
Sydney--east
LITTLE BAY (THE COAST GOLF CLUB)
32mm in 1 hr to 06:00 32.0mm/h
36mm in 1 hr to 07:00 36.0mm/h
21mm in 1 hr to 08:00 21.0mm/h
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Todays highest & lowest
temperatures
|
| Maximum |
Minimum |
33.0 JABIRU AIRPORT Darwin-Daly NT
33.0 BATCHELOR AERO Darwin-Daly NT
32.6 WEIPA AERO N Peninsula QLD
32.2 DOUGLAS RIVER Darwin-Daly NT
32.1 MANGO FARM Darwin-Daly NT
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26.0 COCONUT ISLAND N Peninsula QLD
25.2 HORN ISLAND N Peninsula QLD
24.0 MCCLUER ISLAND Darwin-Daly NT
23.7 WILLIS ISLAND Islands
23.6 LOCKHART RIVER AIRPORT S Peninsula QLD
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2.1 MT HOTHAM Upper NE VIC
3.0 MOUNT BULLER Upper NE VIC
4.0 THREDBO (CRACKENBACK STATION) AWS Snowy Mtns NSW
4.0 MOUNT READ W Coast TAS
5.2 MOUNT WELLINGTON Southeast TAS
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-6.6 LIAWENEE AWS Central Plateau TAS
-5.9 CHARLOTTE PASS (KOSCIUSKO CHALET) Snowy Mtns NSW
-5.5 PERISHER VALLEY SKI CENTRE Snowy Mtns NSW
-5.0 THREDBO (CRACKENBACK STATION) AWS Snowy Mtns NSW
-4.6 COONABARABRAN (NAMOI STREET) CW Slopes N NSW
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Todays greatest temperature
variations from normal
|
| Maximum |
Minimum |
+6.5 26.3 ALICE SPRINGS AIRPORT Alice Springs NT
+5.2 29.5 URANDANGIE Northwest QLD
+4.8 25.0 CURTIN SPRINGS Alice Springs NT
+4.8 23.7 KULGERA Alice Springs NT
+4.5 24.0 MARLA POLICE STATION NW Pastoral SA
+4.5 29.7 MORNINGTON ISLAND Gulf Country QLD
|
+5.9 12.0 KALGOORLIE-BOULDER AIRPORT Goldfields WA
+5.7 12.0 BALGAIR Eucla WA
+5.5 11.2 SOUTHERN CROSS Goldfields WA
+5.1 11.5 NORSEMAN Goldfields WA
+4.4 10.0 SALMON GUMS RES.STN. Goldfields WA
+4.4 10.7 MARLA POLICE STATION NW Pastoral SA
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-3.0 26.0 MANDORA E Pilbara WA
-3.0 26.2 WARRUWI Arnhem NT
-2.6 14.0 MURRAY BRIDGE Lower Murray SA
-2.4 19.0 CASINO AIRPORT North Coast NSW
-1.9 11.0 LAUNCESTON (TI TREE BEND) N Coast TAS
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-6.0 -4.6 COONABARABRAN (NAMOI STREET) CW Slopes
N NSW
-5.9 4.3 MOUNT ISA AERO Gulf Country QLD
-5.3 -2.0 MURRURUNDI POST OFFICE Hunter Valley NSW
-5.3 0.8 SCONE SCS Hunter Valley NSW
-5.2 -3.5 BARRABA POST OFFICE NW Slopes N NSW
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Reports not yet available |
Reports not yet available |
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Reports not yet available |
Reports not yet available |
Todays greatest temperature
variations from normal
|
| Maximum |
Minimum |
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Reports not yet available |
Reports not yet available |
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Reports not yet available |
Reports not yet available |
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Highest wind gusts above
89km/h or mean wind above 62km/h (gale force). Wind direction and mean
windspeed shown in brackets.
None reported
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Other extremes
..
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