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Southwest 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
low
24
25
low
26
low
27
low
28
high
29
low
30
31
Sep 1
2
3
4
5
med
6
low
7
8
low
9
10
low
11
12
low
13
med
14
med
15
16
med
17
med
18
med
19
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 six main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, Western Australia, eastern Australia, the south 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 28 August to 1 September, 17 September to 21 September, and 22 September to 26 September. Rain events originating in the tropics and moving south are possible about 29 August to 2 September.
Over Western Australia the strongest cold fronts should occur about 28 August to 1 September, 5 September to 9 September, and 17 September to 21 September.

Issued Aug 22

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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