28 Day Rainfall Forecast
South West Rain Forecast
South West 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat2Med345Hig6Med7Low8910Low1112Low13Med14Med15Med16Med1718Med19Low20Low21Low22Med2324Med25Low26Med27Low28Low29Low30HigCHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 1 Jun 2020
The hemispheric long wave pattern has been relatively fast moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, New Zealand, and the southeast Pacific.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 12 June to 16 June, 24 June to 28 June, and 29 June to 3 July. Rain events originating in the tropics and moving south are possible about 13 June to 17 June, 19 June to 23 June, and 4 July to 8 July. Over Western Australia the strongest cold fronts should occur about 13 June to 17 June, 20 June to 24 June, and 28 June to 2 July.Forecast Explanation
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.