Pilbara 28-day Rainfall Forecast
|Chance of rainfall within district|
25% to 50%
50% to 75%
The hemispheric long wave pattern has been relatively fast moving in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, the southeast Pacific, and South America.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 7 August to 11 August, 21 August to 25 August, and 28 August to 1 September. Rain events originating in the tropics and moving south are possible about 27 July to 31 July.
Over Western Australia the strongest cold fronts should occur about 8 August to 12 August, 21 August to 25 August, and 25 August to 29 August.
This forecast is produced by a multi-model ensemble consisting of dynamical atmospheric models, which are forced by the latest observed atmosphere, ocean, land and ice conditions. The models are designed to simulate features of the real atmosphere, including the daily movement of long and short wave patterns in the Southern Hemisphere.
The future probability of rain in each district is estimated using output from the multi-model ensemble, combined with historical information about the difference between the model forecasts and observed rainfall.
In this deterministic framework the skill of the forecast tends to decrease with time, however the forecasts are updated daily to provide the latest estimates of rainfall probability out to 28 days.
Further attempts will be made today to secure the flooded Myer redevelopment site in Hobart's central business district.
South Australian River Murray irrigators have seen their second water allocation increase within a month.
Southeastern Australia is in for a wooly few days next week as forecast models begin to jump on the cut-off low bandwagon.