|Chance of rainfall within district|
25% to 50%
50% to 75%
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 the Indian Ocean, New Zealand, the south Pacific, 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 14 November to 18 November, 21 November to 25 November, and 27 November to 1 December. Rain events originating in the tropics and moving south are possible about 4 November to 8 November, 18 November to 22 November, and 29 November to 3 December.
Over Western Australia the strongest cold fronts should occur about 14 November to 18 November, 21 November to 25 November, and 27 November to 1 December.
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.
19:11 EDT Farmers from Tasmania's south-east corner are warning the region could be pushed to the brink of drought unless there is extra rainfall over summer.