Weekly Rainfall Update

For the week to 15 September 2020, rainfall was recorded in the far south-west Western Australia, south-east South Australia, Victoria, Tasmania, eastern New South Wales, and east coast and south-east inland Queensland. Little or no rainfall was recorded elsewhere.

At the start of the week, a high pressure system in the Tasman Sea extended a firm ridge along the east coast, and moist onshore flow produced showers along parts of Queensland's north tropical, central and south-east coasts 

In the first part of the week, a cold front moved away from the south-east, and a broad trough stretched from Central Australia to New South Wales to the west of Tasmania, and tracked eastwards over south-east Australia. The systems tracked eastward and generated widespread light falls over Tasmania, the eastern half of Victoria and south-east New South Wales. Moderate falls were reported in south-west Tasmania.

The surface tough tracked over northern New South Wales and southern Queensland and produced widespread moderate falls in the north-east, and adjacent inland districts in New South Wales. Thunderstorms developed over south-east inland Queensland.

In the west, a cold front brushed the south-west of Western Australia then slipped into the Bight, generating moderate falls in far south-west, and light falls in the far south-east of the state.

During the middle of the week, the  cold front stretched across the far south-east of the country, and the associated slow-moving cloudband tracked across south-east Australia. Moderate falls were recorded in south-east South Australia, and in south-west, central and north-eastern Victoria, and Tasmania. At the end of the week, another fast-moving cold front embedded in a westerly flow, tracked across Tasmania and generated moderate falls in that state's west and north-east.

Onshore flow continued along parts of the east coast of Queensland for the rest of the week, with heavier showers affecting the north tropical Queensland coast.

Rainfall totals in excess of 100 mm were recorded in parts of the north tropical and south-east coasts of Queensland; also in an area in north-east New South Wales, including the highest weekly totals of 119 mm at Meldrum (Coolawarrah).

Rainfall totals between 10 mm and 50 mm were recorded in far south-west Western Australia; south-east South Australia; most of Victoria except in the north-west and east, and in western and north-eastern Tasmania. Similar totals were recorded in elevated areas of the Snowy Mountains, and from the central to north coasts, and adjacent inland districts of New South Wales; and across south-east inland Queensland and along the north tropical, central and south-east coasts of that state.

Impact of recent rainfall on deficits

Rainfall deficits over Australia for the 5-month (April–August 2020) period is discussed in the Drought Statement, issued on 8 September 2020.

Rainfall deficit maps are available for this period as well as for standard periods. The map below show the percentage of mean rainfall that has been received for the rainfall deficit period for the 5-month period, extended to the week ending 15 September 2020.

Rainfall for the period 1 April to 15 September 2020

Serious or severe rainfall deficiencies for the 4-month period are in place in Western Australia across most of the southwestern half of the State. Serious rainfall deficiencies are also in place across parts of central southern and southeast Queensland. Other small areas experiencing serious rainfall deficiencies include the southwest of the Alice Springs District in the Northern Territory, and pockets of southwest South Australia. 

The rain that fell over the past week eased deficiencies very slightly in areas of south-east inland Queensland.

Inland areas of Western Australia have received less than 40% of average for the period. Remaining areas in Western Australia, South Australia and parts of central Queensland have generally received less than 80% to 60% of their average for the period.

 

Map of rainfall totals for this week

Product code: IDCKGRWAR0

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