28 Day Rainfall Forecast
Adelaide Rain Forecast
Adelaide 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat222324Low25Hig26Med27Med28Med29Low30Low31Feb 12345Low6Low7Med89101112131415Low16171819CHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 22 Jan 2021
The hemispheric long wave pattern has been relatively slow moving in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, eastern Australia, South America, and the Atlantic Ocean.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 January to 31 January, 5 February to 9 February, and 25 February to 1 March. Rain events originating in the tropics and moving south are possible about 30 January to 3 February, 16 February to 20 February, and 25 February to 1 March. Over Western Australia the strongest cold fronts should occur about 27 January to 31 January, 5 February to 9 February, and 25 February to 1 March.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.