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Monday 10 July 2000

Storms give moderate falls to Qld, NSW and SW WA
Unusual temperature record for Texas, Qld
Widespread thunderstorms occurred across central and northern NSW and southern and central Queensland this afternoon as an upper trough moved across the region. Some of the storms bordered on being severe, with media reports of a car and caravan overturned after skidding on hailstones near Coonabarabran, hail and strong winds north of Tamworth and localised damage from wind squalls at Nerang on the Qld Gold Coast. Torrential rain fell from a storm band on the Queensland Central Coast, with Rockhampton Airport recording 13.8mm in 20 minutes to 7.30pm and Heron Island, 150km to the east, scoring 19.2mm in 10 minutes to 9.55pm.

Storms of this intensity are unusual in the area in winter, and appear to have resulted from a combination of cold upper air, good upper outflow in the region of a jet stream entrance, and a marked tongue of colder dry air in the lower atmosphere moving with the upper trough, undercutting moist warmer air. The sequence of events, combined with heavy cloud cover, gave the small town of Texas, on the Qld/NSW border 85km west of Tenterfield, an unusual distinction today. The morning was unusually warm, with a minimum of 11.2, 8 above average, the highest departure above average in the nation. Cloud cover and colder air moving in behind the trough then kept the maximum down to 14.0, 4.7 below average and the highest departure below average in the nation.

Heavy showers and thunderstorms preceded and accompanied a wintry cold front as it crossed Western Australia's southwest coast this afternoon. The heaviest falls were in Perth as a line of thunderstorms crossed the city with the front during the early afternoon. The City recorded 25mm between noon and 2pm, and Perth Airport 29mm and Bickley 27mm between noon and 3pm.

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

32.2 Pleasant Valley WA
29.2 Wilsons Promintory Vic
29.2 Twilight Valley Nugent Tas
27.6 Lismore NSW
27.6 Foster Vic

Today's highest & lowest temps

Other extremes

Rainfall:
Perth City WA: 25mm in 2h to 2pm
Perth AP WA: 29mm in 3h to 3pm
Bickley WA: 27mm in 3h to 3pm
Northcliffe WA: 17mm in 3h to noon
Heron Island Qld: 24.2mm in 20m to 9.55pm, 19.2mm falling in the 10m to 9.55pm
St Lawrence Qld: 19mm in 3h to 9pm
Rockhampton Qld: 13.8mm in 20m to 7.30pm
Wonthaggi Vic: 16mm in 3h to 6am

Records set this day

.

Maximum Minimum
33.3 Timber Creek NT 23.8 Horn Is Qld
-2.0 Crackenback NSW -5.7 Charlotte Pass NSW

Greatest variations from normal

Maximum Minimum
+5.1
21.0 Salmon Gums WA
+8.0
11.2 Texas Qld
-4.7
14.0 Texas Qld
-6.4
-2.5 Yeelirrie WA