Capricornia 28-day Rainfall Forecast
|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 five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, 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 21 August to 25 August, 26 August to 30 August, and 2 September to 6 September. 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 9 August to 13 August, 21 August to 25 August, and 26 August to 30 August.
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.
An unusual weather pattern is bringing storms to parts of southern Western Australia, with residents in the Central West, Lower West, Great Southern and Central Wheatbelt districts told to brace for damaging winds and possible flash flooding.
While northern parts of the country have experienced unseasonably warm temperatures, winter is business as usual in the south.
The former owner of the Grantham quarry that allegedly contributed to the fatal 2011 flood has said the western embankment beside the quarry was a natural landmark and not manmade.