Channel Country 28-day Rainfall Forecast
|Chance of rainfall within district|
25% to 50%
50% to 75%
The hemispheric long wave pattern has remained stable in recent weeks. There are three main troughs. Currently the most significant troughs are near the longitudes of the Indian Ocean, the south Pacific, and the Atlantic Ocean.
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 9 August to 13 August, 25 August to 29 August, and 1 September to 5 September. Rain events originating in the tropics and moving south are possible about 29 July to 2 August.
Over Western Australia the strongest cold fronts should occur about 7 August to 11 August, 11 August to 15 August, and 28 August to 1 September.
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.
A large and vicious cold front has swept through southwestern parts of Western Australia, bringing severe weather.
After a few days of computer forecast model uncertainty, there is now growing consensus that a deep low pressure system will form off the New South Wales coast in the coming days.
For the Riverina area, July turned out to be consistently wet and warm.