Sydney 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

May 1

4
low

5
low

7
low

8
low

9
low

10
low

11
med

13
med

14
med

15
med

16
med

17
low

22
low

23
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 seven main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the southeast Pacific, South America, 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, 18 May to 22 May, and 28 May to 1 June. Rain events originating in the tropics and moving south are possible about 30 April to 4 May, and 12 May to 16 May.
Over Western Australia the strongest cold fronts should occur about 2 May to 6 May, 17 May to 21 May, and 23 May to 27 May.

Issued Apr 24

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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