3 March 2020

More rain forecast for midweek and weekend

| Michael Weaver
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rain, storms, Canberra

A storm front passes over Canberra earlier this year. Photo: File.

The forecast is in, with meteorologists predicting Canberra and the surrounding region could get as much as 100 mm of rain between Wednesday (4 March) and the weekend.

The entire eastern half of Australia will see rainfall from the remnants of Tropical Cyclone Esther which will move further east and south, causing widespread showers, thunderstorms and areas of heavy rain in the ACT, NSW, Queensland and Victoria.

Weatherzone forecaster Ben Domensino said a mass of tropical moisture will pass over central and south-eastern Australia this week, causing widespread rain and thunderstorms in multiple states and territories, including a large swathe of the Murray-Darling Basin.

“Moisture associated with ex-Tropical Cyclone Esther will be carried towards south-eastern Australia during the coming days by jet stream winds flowing high above Australia.

“This plume of moisture-laden air will interact with a broad trough of low pressure, generating rain and storms on multiple days along a corridor stretching from the Kimberley down to eastern Victoria,” Mr Domensino said.

Some places could see more than 100 mm from this system, particularly those directly impacted by thunderstorms.

The Bureau of Meteorology forecast says there is almost a 100 per cent chance of between 30 and 50 mm of rain falling in Canberra on Wednesday. A further 20 to 35 mm could fall on Thursday, with a high chance of further follow-up showers on Friday and into the weekend.

Despite good rain for some areas in February, summer rainfall across Australia was below average.

Bureau climatologist Dr Andrew Watkins said summer was the tale of two halves and two main climate drivers – a very strong positive Indian Ocean Dipole (changes in the difference between sea surface temperatures of the tropical western and eastern Indian Ocean) and a near-record negative Southern Annular Mode (the non-seasonal north-south movement of strong westerly winds that blow almost continuously in the southern hemisphere).

Dr Watkins said this resulted in both the warmest and driest December on record, with significant fire weather throughout many parts of the country.

“In January, we saw those two drivers return to neutral levels, plus a very late arrival of the northern monsoon which finally brought tropical moisture to the continent,” Dr Watkins said.

“As we often see once the monsoon arrives in the north, some of that tropical moisture was dragged south, leading to some of the good recent rainfall over the country’s east.

“The rainfall helped contain many of the long-lived bushfires in the east and helped ease drought conditions in some locations. But many inland regions experienced only patchy rainfall and we still need to see sustained rainfall to relieve drought in many areas.”

The forecast for rain along the south-east of NSW is slightly less than in Canberra.

At Batemans Bay there is a very high chance of between 25 and 45 mm of rain on Wednesday, with up to 25 mm on Thursday. Light rain is also forecast for Friday and later in the day on Saturday when the sold-out Red Hot Summer Tour comes to town.

Similar rainfall totals are forecast to the south between Bega and Eden.

No flood warnings have been issued, although further rainfall will top up the area’s creeks and dams.

The only flood warnings for the Warrego and Paroo rivers in south-western Queensland. These rivers feed into the Murray-Darling catchment. Areas of western NSW that have been in drought will also see their first significant rain during the next week.

Original Article published by Michael Weaver on The RiotACT.

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