Weekly Rainfall Update
For the week to 18 July 2017, rainfall was recorded across the South West Land Division and the southern coastal districts of Western Australia; southern South Australia; most of Victoria; Tasmania; northeastern and Alpine New South Wales; southeastern Queensland; and parts of east coast Queensland. Rainfall was also recorded in parts of Central Australia.
At the start of the week, a cloudband in association with a mid-level trough brought falls to Central Australia while a cold front crossing the south of the country produced mainly light falls in southern Western Australia. The front continued eastward, delivering light to moderate falls to eastern South Australia, western Victoria, and across Tasmania.
During the middle of the week, a mid-level trough and associated surface trough strengthened while moving across northern New South Wales and southern Queensland, resulting in light to moderate falls.
Towards the end of the week, a cold front and associated cloudband connected to a fast moving low pressure system south of the Bight, which brought more rainfall to the South West Land Division of Western Australia. The complex low strengthened as it moved towards the east, with the associated cold front producing widespread rainfall and some thunderstorms along the southeast coast of South Australia, across much of Victoria except Gippsland, and northern Tasmania.
Light rainfall was also reported on Queensland's North Tropical Coast and the east coast of the Cape York Peninsula during the week, in response to weak onshore flows.
Falls of between 50 and 100 mm were recorded in northern and northwestern Tasmania, parts of the Mount Lofty Ranges in South Australia, and isolated locations in southern Western Australia and coastal Queensland. The highest weekly rainfall total was 90 mm at Huntly in the Lower West District of Western Australia.
Weekly totals in excess of 15 mm were recorded in western and northern Tasmania; the Alpine region; from western Victoria through southeastern South Australia to the Eyre Peninsula; patches of Lower West and Southwest Western Australia; and pockets of northeastern New South Wales, southeastern Queensland and the North Tropical Coast.
Totals of up to 15 mm were recorded surrounding higher falls and in regions of southern and northeastern New South Wales, the Maranoa and Warrego Region of southern Queensland, and central Australia near the South Australia/Northern Territory border.
Little to no rainfall was reported for most of Western Australia away from the South West Land Division and southern coast; central and northeastern South Australia; most of the Northern Territory; central and western New South Wales; and most of Queensland away from the southeast and east coast.
Impact of recent rainfall on deficits
The Drought Statement, issued on 3 July 2017, discusses rainfall deficits over Australia for the 4-month (March 2017–June 2017) period. The rainfall deficit map is available for this period 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 4-month period ending 18 July 2017.
Rainfall for the period 1 March 2017 to 18 July 2017
Serious or severe rainfall deficiencies are in place near the west coast of Western Australia, on the Eyre Peninsula in South Australia, and in western and southern Tasmania. Serious deficiencies are also present in South Australia on the Yorke and Fleurieu peninsulas, parts of the Adelaide region and the mid-North, and on Kangaroo Island; as well as in West Gippsland in Victoria.
Rainfall during the past week has slightly eased deficiencies in the Eyre Peninsula and southwestern Western Australia. In other areas there was little to no change.
Rainfall received for the period in affected areas of Western Australia ranged from less than 20% of average near the Northwest Cape across the Gascoyne region to less than 60% of average in parts of South West Western Australia. Rainfall totals were less than 50% of average for much of the Eyre Peninsula in South Australia, and less than 70% of average for the majority of the other areas affected in South Australia, and less than 60% of average for West Gippsland. Rainfall totals were less than 70% for most of Tasmania.
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