Issued on 3 October 2013
Rainfall deficiencies increase across Queensland
September rainfall was above average across most of Western Australia, excluding the northern interior. Areas of monthly totals in the highest 10% of records were recorded in the greater southwest and Goldfields District. Most of South Australia, parts of the Northern Territory, large areas of Queensland from the Gulf to the southeast, parts of northeastern and western New South Wales and small areas of northeastern and southwestern Victoria recorded below-average monthly totals. Very little or no rain fell across almost the whole of Queensland during the month.
12-month rainfall deficiencies
Rainfall deficits for the 12-month (October 2012 to September 2013) period have seen slight improvement across southern Australia, where only small areas of serious deficiencies remain. In contrast, the very dry September has seen an increase in deficiencies across across Queensland. Serious to severe deficiencies (lowest 10% to 5% of records) remain across much of western Queensland and in a broad band inland of the coastal ranges, extending from the Gulf of Carpentaria to just across the New South Wales border. Across the most severely affected regions, total rainfall has been 40 to 80% below the long-term (1961–1990) average for the 12-month period.
18-month rainfall deficiencies
Longer-term rainfall deficiencies for the 18-month (April 2012 to September 2013) period remain similar to those in the previous Drought Statement, and have also seen some improvement across southern Australia and worsening in Queensland and central Australia. Serious to severe deficiencies persist between Geraldton and Shark Bay on the west coast of Western Australia, across the Nullarbor Plain, northwestern Victoria and adjacent parts of the Riverina and southwest of New South Wales, in areas between northeastern South Australia and Queensland's Gulf Country, and in areas of southern Queensland and New South Wales west of the Great Dividing Range. The rainfall percentages map shows large areas of eastern central Australia, Queensland inland of the coastal ranges, northern and western New South Wales and the Nullarbor Plain have received less than 65% of long-term average rainfall for the period.
Significant areas of the east and west coasts continue to see rainfall deficiencies over shorter periods (2 to 6 months), as well as those above.
Weekly soil moisture levels in the upper soil layer have decreased dramatically across much of Queensland, the south of the Northern Territory, South Australia and western New South Wales compared to the weekly values one month ago and are now are very much below average across large areas. Recent rainfall has seen soil moisture increase to near-average across central New South Wales and to above average across Southwest Western Australia while in the Pilbara and northern Gascoyne and well as eastern New South Wales soil moisture continues to be below average. Soil moisture has declined to near-average across much of Tasmania but remains above average across the north of the state, while in Victoria soil moisture has also declined and is below average across much of the state.
In the deeper layer, weekly soil moisture generally shows a similar pattern to that of last month, with some decrease across the southeast. Values are very much above average for a large area of Western Australia between the eastern Pilbara/western Kimberley and the top of the Eucla District. Soil moisture is somewhat above average across the Southeast Coastal and Goldfields districts of Western Australia and small areas of South Australia, western and central New South Wales and Queensland, excluding the far north, Darling Downs and Maranoa, where soil moisture is average to below average. Soil moisture is also below average across the eastern Top End, the South West Land Division of Western Australia (excluding the southwest, where values are near average), the Nullarbor Plain, east coast Tasmania, much of Victoria and eastern New South Wales inland of the ranges.
Lowest on record - lowest in the historical analysis, which runs from 1900.
Severe deficiency - rainfalls in the lowest 5% of historical totals.
Serious deficiency - rainfalls in the lowest 10% of historical totals, but not in the lowest 5%.
Very much below average - rainfalls in the lowest 10% of historical totals.
Below average - rainfalls in the lowest 30% of historical totals, but not in the lowest 10%.
Average - rainfalls in the middle 40% of historical totals.
Above average - rainfalls in the highest 30% of historical totals, but not in the highest 10%.
Very much above average - rainfalls in the highest 10% of historical totals.
Product Code IDCKGD0AR0