Perth 28-day Rainfall Forecast
med
high
high
low
high
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low
low
med
low
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high
med
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low
low
low
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med
| 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 the southwest Indian Ocean, the Indian Ocean, Western Australia, the south Pacific, the southeast Pacific, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 1 August to 5 August, 7 August to 11 August, and 14 August to 18 August. Rain events originating in the tropics and moving south are possible about 9 July to 13 July.
Over Western Australia the strongest cold fronts should occur about 26 July to 30 July, 4 August to 8 August, and 12 August to 16 August.
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.
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Weather News
Big waves approaching the east and west
14:21 EST
Large swells and waves are approaching both the east and west coasts of Australia this week as two strong systems build over the open ocean.
Healthy winter rain for southwest Queensland and western NSW
12:11 EST
A slow-moving trough brought tropical moisture to dry parts of southwest Qld and western NSW on Friday and Saturday, resulting in record July rain for some areas.
