28 Day Rainfall Forecast
Melbourne Rain Forecast
Melbourne 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat12Med13Low141516171819Med20Hig21Med22Med23Hig24Med25Low2627Low28Low29Med30Low31LowAug 1Med2Med3Hig4Med5Med6Low7Low8Med9MedCHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 12 Jul 2020
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, Western 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 18 July to 22 July, 27 July to 31 July, and 14 August to 18 August. Rain events originating in the tropics and moving south are possible about 4 August to 8 August, 8 August to 12 August, and 13 August to 17 August. Over Western Australia the strongest cold fronts should occur about 17 July to 21 July, 21 July to 25 July, and 14 August to 18 August.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.