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Thursday 07 September 2000

Cold, wet and windy in SA, NSW, Vic20Sep00
A deep low close to the South Australian coast today brought heavy rain, gale force winds and unusually low temperatures across much of the southeast mainland today. 30 to 40mm of rain fell in the Adelaide Hills, much of it in heavy showers around dawn, causing local flooding, and inducing a mud slide that closed the main rail link to Melbourne between Belair and Blackwood. Adelaide, the northern and northeastern suburbs were worst hit by flash flooding and wind damage. Houses under construction in Greenwith and Ingle Farm, several houses at Hope Valley, and the police station at Parks were flooded. The roofs of 13 houses at Para Vista were damaged by strong winds. The low moved only slowly all day, staying close to the coast, and with central pressure around 985hPa. With barometer readings 25hPa higher across central SA, the strong pressure gradient produced continuing squally westerly winds. Mt Lofty recorded a gust of 117km/h early afternoon, and strong wind gusts brought down a tree in the Adelaide Hills, killing a person, and caused damage in Adelaide's northern suburbs.

A trough line associated with the low moved rapidly east from central SA into western Victoria, NSW and southwest Queensland, bringing brief gale to storm force winds and dust storms. At Oodnadatta, the anemometer averaged over 75km/h for around 30 minutes late last night, with one 10 minute average of 94km/h. Cold air wrapping around the low swept across Victoria and southern and central NSW, and combined with heavy cloud cover to produce an unusually cold day. Kerang, on the Victorian/NSW border north of Bendigo, had a top temperature to 3pm of only 10, close to its record lowest for September. Canberra, with a top of 9, had its coldest September day in 15 years. Storms both accompanied and followed the trough, with one at Temora in southern NSW producing large hail and winds strong enough to down powerlines during the evening.

Today's highest rainfall totals for the 24 hours to 9am

43.4 Mt Lofty summit SA
42.6 Lenswood SA
37.4 Maitland SA
37.2 Uraidla SA

Other high SA falls:
37.0 Bridgewater
34.4 Lobethal
33.2 Heathfield
32.4 Pooraka
31.0 Belair
30.8 Wittunga
29.0 Wilpena Pound

High falls for other periods:

Mt Crawford SA: 22mm in 6h to 9am
Bendigo AP Vic: 13mm in 3h to 3pm
Mt Read Tas: 15mm in 3h to 3pm

Today's highest & lowest temps

Other extremes

Wind:
Moomba AP SA: 10m average 74km/h at 3.31am
Neptune Is SA:
10m average 94 and gust to 113km/h at 5.45pm
Mt Lofty summit SA: gust to 117km/h at 1.30pm; 10m average 85km/h at 9pm
Mt Crawford SA: gusts to 120km/h at 1.06pm and 1.15pm
Strathalbyn SA: gust to 89km/h at 1.13pm
Birdsville Qld: 10m average 67km/h at 3.30am
Thredbo Crackenback NSW: gust to 96m/h at 6.43pm
Mt Hotham Vic: gust to 94km/h at 6.10pm

Flood peaks:
Torrens at Gumeracha Weir:
11.3m late morning with minor flooding

Records set this day

.

Maximum Minimum
39.6 Wave Hill New Station NT 25.5 Troughton Is WA
0.0 Mt Wellington Tas -8.5 Perisher Valley NSW

Greatest variations from normal

Maximum Minimum
+7.8
33.0 Amberley AP Qld
+7.8
33.0 Surat Qld
+7.8
32.5 Brewarrina NSW
+10.2
22.9 Urandangie Qld
-6.8
16.0 Jerrys Plains NSW
-7.0
4.0 Warburton AF WA