Sydney 28-day Rainfall Forecast
low
med
low
low
low
low
low
low
low
low
low
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low
low
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low
low
| 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 five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, New Zealand, 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 May to 5 May, 6 May to 10 May, and 16 May to 20 May. Rain events originating in the tropics and moving south are possible about 2 May to 6 May.
Over Western Australia the strongest cold fronts should occur about 6 May to 10 May, 16 May to 20 May, and 20 May to 24 May.
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
A month's rain in a day and more on the way
12:05 EST
Queensland's North Tropical Coast has copped a soaking over the last couple of days, with some places picking up their entire monthly average in just 24 hours.
Rainfalls of up to 300mm as Far North Queensland placed on flood watch
05:04 EST
The Bureau of Meteorology has warned parts of Far North Queensland could expect daily rainfall totals of up to 300 millimetres in coming days.
