Australian Weather News


Monday, 30 JUL 2001

About Australian Weather News
Temperature and rainfall records tumble as unseasonal weather grips WA
Cold in Far North Queensland
Records, records everywhere...
Overnight minimum temperatures (below, top) were up to 11 above normal across the southwestern third of WA, giving Perth Airport and possibly other locations their warmest July night on record, while in Far North Queensland, Cooktown recorded its coldest July night. Maximum temperature variations (middle) were just as great, producing another crop of records. Widespread rain in the same area broke yet more records and eased the drought. The map (bottom) shows total rain for the week ended 31 July, though the rain in SW WA all fell over 4 days to 31 July. 
BoM
In an extraordinary night and day's weather, longstanding rainfall, maximum and minimum temperature records were broken across southern Western Australia today. 

The record warmth allowed unseasonably high moisture levels to develop. The warm tropical air has been drawn down from the northwest ahead of a slow-moving trough, bringing dew points of around 15 which is unusually high for winter. Though cloud in the humid airmass was patchy, it developed explosively during yesterday evening in response to strong upmotion in the lower and middle atmosphere ahead of a troughline. Perth Airport recorded 63.2mm in the four hours to 9 last night. The airport's 24 hour total to 9 this morning of 107.6mm is its heaviest July one-day fall in nearly 60 years of record. Bickley, on the Darling Escarpment 20km ESE of the airport, recorded 99mm in the nine hours to midnight this morning for a 24 hour total of 137, while nearby Mundaring topped the list with 158mm. Widespread power cuts and some flooding were reported around Perth.

While the humidity streamed southeastwards, the stream as a whole was pushed to the east by the advancing trough, giving heavy rain from the Central West to the Great Southern during the morning and east as far as Esperance later in the day. Details of heavy 24 hour falls, short duration falls, and records are given in the National Weather Extremes below, and for yesterday.

In addition to breaking its July rainfall record, Perth Airport also registered its warmest July night on record, the minimum of 16 (rounded) being nearly a degree warmer than the previous record in nearly 60 years of measurement at the site. With overnight minima between 10 and 13 above normal from the Murchison to the Goldfields, it is likely that other records have also fallen.

To the east of the rainband, maximum temperatures were also 10 to 13 above normal, with Kalgoorlie-Boulder Airport recording its hottest July day in 60 years of measurement when the mercury rose to 28.7. Yeelirrie station, 400km north of Kalgoorlie, which broke its 27 year July maximum record yesterday, surpassed it today with a reading of 28.6.

The rains came the day after Prime Minister John Howard announced interim drought relief measures for wheat belt and Great Southern farmers. The area shown in green in the rainfall map at left corresponds closely with the area that has received either record low rainfall during the past year, or falls in the lowest 10% of record. In some areas, the drought is the worst in nearly a century. Lake Grace, 275km SE of Perth, had recorded only 94.4mm in the 11 months from 1 September last year to yesterday morning, but received 31mm to 9 this morning, and a further 9mm during the day.

Southerly winds generated by the Tasman Sea low that battered the NSW coast on the 28th arrived in Far North Queensland yesterday, bringing cool, dry and cloudless conditions. Unusually low minimum temperatures resulted overnight, with Cairns reporting 8.1, 9 below, and Cooktown a record-breaking 8.0, 10.2 below.

National weather extremes for today
Data provided by the Bureau of Meteorology
Last updated at 17:37 EDST on 03/08/01

Quality control note: Data is complete, and has been visually checked by AWN for gross errors. Less obvious errors may remain. See Explanation of Extremes Pages for more information
Records set this day (previous record and years of computerised record shown in brackets):
Highest daily rainfall for July:
Wongan Hills WA: 45.8 (40.9, 94)
Wongan Hills Res Stn WA: 44.4 (39.0, 64)
Perth Airport WA: 107.6 (97.2, 57)
Pearce RAAF WA: 77.0 (64.4, 43)
Brookton WA: 71.3 (61.7, 92)
Corrigin WA: 45.6 (37.6, 91)
Ravensthorpe WA: 48.0 (30.7, 94)

Lowest daily minimum temperature for July:
Cooktown Mission Strip Qld: 8.0 (8.3, 17)

Highest daily minimum temperature for July:
Perth Airport WA: 16 (15.1, 57)

Highest daily maximum temperature for July:
Eyre WA: 31.0 (28.6, 14)
Balgair WA: 28.4 (28.0, 18)
Kalgoorlie-Boulder Airport WA: 28.7 (28.1, 60)
Yeelirrie WA: 28.6 (27.9 set yesterday, 27)

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.

155.8 MUNDARING Lower West WA
137.0 BICKLEY Lower West WA
126.4 PICKERING BROOK Lower West WA
111.0 KARRAGULLEN NORTH Lower West WA
107.6 PERTH AIRPORT Lower West WA

WESTERN AUSTRALIA
    Lower West
155.8 MUNDARING
137.0 BICKLEY
126.4 PICKERING BROOK
111.0 KARRAGULLEN NORTH
107.6 PERTH AIRPORT
89.0 PERTH METRO
87.0 WOODRIDGE ESTATE
86.0 GINGIN AERO
86.0 MOUNT HELENA
84.8 BEDFORDALE
84.6 GLENROYD
83.0 NOBLE FALLS
82.0 ROLEYSTONE
77.0 PEARCE RAAF
75.0 SWANBOURNE
74.4 MOSMAN PARK
71.0 MOONDAH BROOK
67.6 CHITTERING HEIGHTS
61.8 LANCELIN
59.0 JANDAKOT AERO
53.0 BADGINGARRA RESEARCH STN
52.0 LEEMAN
51.4 DANDARAGAN WEST
50.4 BADGINGARRA
    Cent Wheatbelt
52.4 WATTENING
52.0 MECKERING
50.6 NORTHAM
    Gt Southern
71.3 BROOKTON
68.4 REDLANDS
66.6 OAKLAND
60.2 AMRISTA PARK
57.7 PINGELLY
55.6 WICKEPIN SOUTH
53.8 COONDEE

High rainfall for periods of 6 hours or less.


WESTERN AUSTRALIA
    Central West
GERALDTON AIRPORT
11.8mm in 30 min to 01:00 23.6mm/h
11.8mm in 1 hr to 01:00 11.8mm/h
10.0mm in 1 hr to 05:30 10.0mm/h
10.4mm in 1 hr to 06:00 10.4mm/h
25.0mm in 3 hr to 09:00 8.3mm/h
15.0mm in 3 hr to 12:00 5.0mm/h
WONGAN HILLS
28.0mm in 3 hr to 09:00 9.3mm/h
KALBARRI
21.0mm in 3 hr to 09:00 7.0mm/h
15.0mm in 3 hr to 12:00 5.0mm/h
    Lower West
BADGINGARRA RESEARCH STN
15.0mm in 3 hr to 06:00 5.0mm/h
PEARCE RAAF
19.0mm in 3 hr to 00:00 6.3mm/h
LANCELIN
15.0mm in 3 hr to 06:00 5.0mm/h
GINGIN AERO
29.0mm in 3 hr to 00:00 9.7mm/h
PERTH METRO
17.0mm in 3 hr to 00:00 5.7mm/h
BICKLEY
15.0mm in 3 hr to 03:00 5.0mm/h
    Gt Southern
JACUP
17.0mm in 3 hr to 00:00 5.7mm/h
LAKE GRACE
10.0mm in 1 hr to 03:00 10.0mm/h

NEW SOUTH WALES
    Sydney--east
SYDNEY AIRPORT AMO
13.0mm in 30 min to 23:00 26.0mm/h
13.0mm in 1 hr to 23:00 13.0mm/h

Todays highest & lowest temperatures

Maximum Minimum
32.2 CURTIN AERO W Kimberley WA
31.3 DERBY AERO W Kimberley WA
31.3 OENPELLI Darwin-Daly NT
31.1 WEST ROEBUCK W Kimberley WA
31.1 BATCHELOR AERO Darwin-Daly NT
25.0 NORTHERN ENDEAVOUR Islands
24.0 COCONUT ISLAND N Peninsula QLD
23.1 CHRISTMAS ISLAND AERO Islands
22.2 HORN ISLAND N Peninsula QLD
21.0 MCCLUER ISLAND Darwin-Daly NT
21.0 VARANUS ISLAND Islands
21.0 WILLIS ISLAND Islands
5.0 THREDBO (CRACKENBACK STATION) AWS Snowy Mtns NSW
6.2 MOUNT READ W Coast TAS
7.1 CHARLOTTE PASS (KOSCIUSKO CHALET) Snowy Mtns NSW
7.1 MOUNT WELLINGTON Southeast TAS
7.2 MT HOTHAM Upper NE VIC
-7.1 CHARLOTTE PASS (KOSCIUSKO CHALET) Snowy Mtns NSW
-4.5 PERISHER VALLEY SKI CENTRE Snowy Mtns NSW
-4.0 ULURU RANGERS Alice Springs NT
-4.0 THREDBO VILLAGE Snowy Mtns NSW

Todays greatest temperature variations from normal

Maximum Minimum
+13.2   31.0 EYRE Eucla WA
+12.2   28.7 KALGOORLIE-BOULDER AIRPORT Goldfields WA
+11.8   29.1 BALLADONIA Eucla WA
+10.6   27.9 CASHMERE DOWNS Goldfields WA
+10.1   28.0 EUCLA Eucla WA
+10.1   28.4 LEONORA Goldfields WA
+13.3   18.6 PAYNES FIND Murchison WA
+11.2   17.0 CASHMERE DOWNS Goldfields WA
+11.2   15.6 SOUTHERN CROSS Goldfields WA
+11.0   15.8 KALGOORLIE-BOULDER AIRPORT Goldfields WA
+11.0   17.0 LEONORA Goldfields WA
-2.7   16.6 ENEABBA Central West WA
-2.6   15.0 BADGINGARRA RESEARCH STN Lower West WA
-2.5   18.8 KALBARRI Central West WA
-2.3   26.0 ELLIOTT Barkly NT
-2.0   15.2 MOORA Central West WA
-10.2   8.0 COOKTOWN MISSION STRIP N Coast--Barron QLD
-9.0   8.1 CAIRNS AERO N Coast--Barron QLD
-8.2   6.0 PALMERVILLE S Peninsula QLD
-7.7   4.4 GEORGETOWN POST OFFICE Upper Carpentaria QLD
-7.7   3.6 KAIRI RESEARCH STATION N Coast--Barron QLD
-7.7   1.0 CAMOOWEAL TOWNSHIP Northwest QLD

Highest wind gusts above 89km/h or mean wind above 62km/h (gale force). Wind direction and mean windspeed shown in brackets.

ROTTNEST ISLAND Lower West WA : 85 (200/ 65 ) at 20:30
CAPE LEEUWIN SW & S Coast WA : 83 (280/ 74 ) at 10:55

Other extremes

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