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Central Highlands 28-day Rainfall Forecast
- period
- 28-day
- 12-month
| Chance of rainfall within district | |||
|---|---|---|---|
| nil < 25% |
low 25% to 50% |
med 50% to 75% |
high ≥ 75% |
Issue Notes
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, Western Australia, eastern Australia, the south Pacific, the southeast Pacific, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 May to 31 May, 12 June to 16 June, and 17 June to 21 June. Rain events originating in the tropics and moving south are possible about 28 May to 1 June, 3 June to 7 June, and 12 June to 16 June.
Over Western Australia the strongest cold fronts should occur about 20 May to 24 May, 24 May to 28 May, and 28 May to 1 June.
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.
