Weekly Rainfall Update

For the week to 23 October 2018, rainfall was recorded in the South West and Kimberley regions of Western Australia, most of the northern half of the Northern Territory, the Gulf Country, most of eastern Queensland, central and eastern New South Wales, most of Victoria except the northwest, a small part of southeastern South Australia, and most of Tasmania. 

At the start of the week, a surface trough with embedded low pressure systems extended from northern Western Australia through northern parts of the Northern Territory and Gulf Country, generating thunderstorms and moderate falls. The surface trough extended through eastern Australia, crossing central Queensland and inland New South Wales, connecting to a small low and associated cold front over Bass Strait. The associated cloudband and thunderstorm activity brought moderate falls to eastern Australia, including Tasmania. 

The surface trough lingered over inland Queensland and New South Wales until the middle of the week, triggering further isolated thunderstorm activity through the central and southern interior of Queensland, and about the northeast and central coast of New South Wales. A westerly flow brought moderate falls to western Tasmania. In the west, a cold front and pre-frontal trough brushed the west coast and southwest Western Australia, with widespread light falls reported along the Gascoyne coast and the South West Land Division, and moderate falls near the southwest coast of Western Australia. Isolated thunderstorms developed along a broad surface trough in the northern Kimberley and parts of the northwest Top End. 

In the last part of the week, a cloudband with active and vigorous embedded thunderstorms moved through the east of the country, driven by the cold front, which was now tracking over southeastern Australia, and the surface trough extending from southern Queensland, through central New South Wales, to eastern Victoria. Moderate falls were recorded across Queensland's Darling Downs and Granite Belt, parts of eastern New South Wales, and central to eastern Victoria. As the trough moved eastwards, further thunderstorms developed over southeast Queensland and northeastern New South Wales at the end of the week. 

Rainfall totals exceeding 100 mm were recorded at isolated locations in both the Top End of the Northern Territory, and a few locations around northeastern New South Wales and southeastern Queensland. The highest weekly total was 195 mm at Yarras (Mount Seaview) in New South Wales. 

Rainfall totals exceeding 50 mm were recorded in parts of the Top End and Gulf Country, isolated parts of southeastern Queensland and northeastern New South Wales, and small areas of northwestern Tasmania. 

Rainfall totals between 10 mm and 50 mm were recorded in the northern Kimberley and coastal southwest of Western Australia; most of the northern half of the Northern Territory except Arnhem Land; the Gulf Country; most of eastern Queensland; central to eastern New South Wales; most of Victoria except the northwest; an area of southeastern South Australia; and most of Tasmania. 

Little or no rainfall was recorded in remaining parts of Western Australia, the southern half of the Northern Territory, most of South Australia, southwest Queensland, western New South Wales, and northwestern Victoria.

Impact of recent rainfall on deficits

The Drought Statement, issued on the 3 October 2018, discussed rainfall deficits over Australia for the 6-month (April–September 2018), the 9-month (January–September 2018) and 18-month (April 2017–September 2018) periods. Rainfall deficit maps are available for these periods as well as for standard periods.

The maps below show the percentage of mean rainfall that has been received for the rainfall deficit period for the 6-month, 9-month and 18-month periods ending 23 October 2018.

Rainfall for the period 1 April 2018 to 23 October 2018

Serious or severe rainfall deficiencies for the 6-month period are present across northern and eastern Victoria, nearly all of New South Wales, large parts of southern, western, and eastern Queensland, and much of eastern South Australia away from the far southeast. Large areas of serious or severe rainfall deficiencies are also in place for Central Australia and areas of Western Australia's interior, south coast, and the south of the Goldfields District. 

Rainfall during the last week has eased deficiencies somewhat in affected areas of eastern Queensland and New South Wales. 

Affected areas of northern and eastern Victoria and agricultural South Australia have generally received between 70% and 40% of average rainfall for the period. The coastal south of Western Australia has received between 80% and 60% of their average, with an area of the central Goldfields reaching more than 100%, with the percentage of mean rainfall received decreasing to less than 30% further inland. Most of New South Wales, inland eastern South Australia, and southern and eastern Queensland have received less than 60% of average rainfall for the period, and less than 20% of the mean for a large area spanning northwestern New South Wales, southwestern Queensland, and parts of Central Australia.

Rainfall for the period 1 January 2018 to 23 October 2018

Serious to severe rainfall deficiencies for the 9-month period are in place across nearly all of New South Wales, except the northern coast; much of northern, southern central, and eastern Victoria; large parts of southern Queensland, and much of eastern South Australia except the far southeast. 

Recent during the past week has eased deficiencies slightly in affected areas away from the western parts of Queensland and New South Wales.

Affected parts of Victoria, agricultural districts of South Australia and eastern New South Wales, have generally received between 70% and 40% of average rainfall for the period. Much of northwestern New South Wales, southwestern Queensland, and northeastern South Australian have received less than 30% average rainfall for the period, while the affected area on the south coast of Western Australia has received between 80% and 60% of the average.

Rainfall for the period 1 April 2017 to 23 October 2018

For the 18-months starting April 2017, rainfall deficiencies persist over almost all of New South Wales away from the northeast coast and southern border; across eastern to central southern Victoria; southern, central, and southwestern Queensland, much of eastern South Australia except the far southeast, and along parts of the western and southern coast of Western Australia. 

Recent during the past week has eased deficiencies slightly in affected areas in Queensland's central west and small areas of central and eastern New South Wales.

Rainfall in affected areas of Western Australia, agricultural districts of South Australia, Victoria, southern New South Wales, and southeastern Queensland has generally been between 80% and 60% of average for the period. Large areas of New South Wales away from the south and northeast, northeastern South Australia, and southwestern Queensland have received between 60% and 30% of average rainfall for the period.

Map of rainfall totals for this week

Product code: IDCKGRWAR0