28 Day Rainfall Forecast
Illawarra Rain Forecast
Illawarra 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat14Hig15Med16Low17Low1819202122Low232425262728Low29Low30Low31Aug 1234567Med8Hig9Hig10Low11LowCHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 14 Jul 2020
The hemispheric long wave pattern has been relatively fast moving in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, the Indian Ocean, eastern Australia, New Zealand, the southeast Pacific, and the Atlantic Ocean.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 July to 31 July, 4 August to 8 August, and 10 August to 14 August. Rain events originating in the tropics and moving south are possible about 28 July to 1 August. Over Western Australia the strongest cold fronts should occur about 27 July to 31 July, 1 August to 5 August, and 5 August to 9 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.