Fairfax Media Network

Weather News

Storms in SA to end a wet autumn

Guy Dixon, Saturday May 31, 2014 - 08:44 EST

Widespread showers and thunderstorms reached a peak this afternoon after kicking off in the early hours of this morning.

A large cut-off low and associated trough is slowly making its way across the Great Australian Bight triggering showers and thunderstorms over South Australia.

Isolated thunderstorms began firing before the sun had even risen this morning over southwestern parts of SA. As the day progressed, thunderstorms began to fire up as a deep low pressure trough and upper level cold pool worked in conjunction to provide optimum conditions for instability.

In the period from 3am this morning until 4pm CST, over 4,693 lightning strikes were recorded within a 250 km radius of Woomera. Heavy showers with this system also brought a wet end to a wet autumn for this part of the Country. Roxby downs saw 3mm in 10 minutes just after midday, while Minnipa has seen 12mm since 9am. These showers are a fitting close to this soaked autumn. During the season, Coober Pedy recorded 176.2mm, over 6.5 times the seasonal average.

Despite having seen the peak of storms in SA this afternoon, a band of thunderstorms along the eastern flank of the trough will be evident tomorrow as the system pushes east.

As a relatively warm surface airmass rises through the atmosphere, the upper level pool of cold air will accentuate the temperature difference and therefore accelerate instability. This intense lifting will sustain thunderstorms on the trailing edge of the system.

Between these two bands of storms however is where the rain will be heaviest.

Heavy showers over SA's North East Pastoral and Mid North will extend into NSW's Upper and Lower Western Districts tomorrow, where isolated falls of up to 20mm are a chance. Sunday, however, is likely to be the wettest day for much of NSW. Isolated falls up to 100mm are a chance over the Central West Slopes and Plains with widespread falls of 50mm likely.

An area of convergence just offshore, will also brings the risk of falls in excess of 50mm along the coast from the Illawarra to the Hunter on Sunday.

- Weatherzone

© Weatherzone 2014

More breaking news

Sydney Morning Herald
ABC News
National Nine News
News Limited

Display Your Local Weather

Weather News

Southern states swelter as power supply struggles

00:08 EDT

The power supply in Victoria and South Australia is being put to the test as five of the states and territories face an extreme heatwave, after temperatures in some areas hit 40 degrees Celsius.

Melbourne hits 42C before cool change as authorities defend 'heat kills' warnings

21:48 EDT

Melburnians — and the world's best tennis players — have battled through temperatures of about 42 degrees Celsius, as energy authorities curtailed some industrial users' power consumption and firefighters across Victoria stood on high alert.

Canberra braces for heatwave as temperatures expected to soar above 37C for four consecutive days

21:03 EDT

Canberrans are about to swelter through the weekend, with four consecutive days at or above 37 degrees Celsius.