28 Day Rainfall Forecast
Illawarra Rain Forecast
Illawarra 28-day Rainfall Forecast
Sun Mon Tue Wed Thu Fri Sat21Med22232425Med2627Low28Low29Low30LowOct 12Low3Low4Low56Low7Low8Med9Med10Med11Low1213Med14Hig15Low1617Low1819LowCHANCE OF RAINFALL WITHIN DISTRICTNil< 25%Low25 - 50%Medium50 - 75%High≥ 75%
Issue NotesIssued 21 Sep 2020
The hemispheric long wave pattern has remained stable 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, New Zealand, 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 9 October to 13 October, 17 October to 21 October, and 21 October to 25 October. Rain events originating in the tropics and moving south are possible about 26 September to 30 September, 11 October to 15 October, and 19 October to 23 October. Over Western Australia the strongest cold fronts should occur about 30 September to 4 October, 9 October to 13 October, and 20 October to 24 October.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.