Sydney 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

21
low

22
med

23
high

24
high

25
high

26
med

Jul 1
low

2
med

3
low

6
low

7
low

10
low

14
low

15
med

16
med

17
low

18
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 slow moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, the Indian Ocean, Western Australia, the south Pacific, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 28 June to 2 July, 6 July to 10 July, and 19 July to 23 July. Rain events originating in the tropics and moving south are possible about 7 July to 11 July.
Over Western Australia the strongest cold fronts should occur about 25 June to 29 June, 6 July to 10 July, and 20 July to 24 July.

Issued Jun 20

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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