Sydney 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

16
low

17
low

22
low

28
med

29
low

30
low

Aug 1

7
low

8
med

9
high

10
low

11
low

12
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 been relatively fast moving in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, the Indian Ocean, eastern Australia, 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 27 July to 31 July, 4 August to 8 August, and 10 August to 14 August. 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 27 July to 31 July, 1 August to 5 August, and 5 August to 9 August.

Issued Jul 14

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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