28 Day Rainfall Forecast
Channel Country Rain Forecast
Channel Country 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat1819202122232425262728293031Sep 123456789101112131415CHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 17 Aug 2022
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, eastern Australia, and the south Pacific.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 15 August to 19 August. Rain events originating in the tropics and moving south are possible about 15 August to 19 August. Over Western Australia the strongest cold fronts should occur about 15 August to 19 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.