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South West 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
4
high
5
med
6
med
7
low
8
med
9
med
10
11
12
low
13
low
14
med
15
low
16
17
low
18
low
19
20
21
22
low
23
low
24
25
low
26
low
27
med
28
29
30
low
31
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, Western Australia, eastern Australia, 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 12 March to 16 March, 23 March to 27 March, and 27 March to 31 March. Rain events originating in the tropics and moving south are possible about 17 March to 21 March, and 22 March to 26 March.
Over Western Australia the strongest cold fronts should occur about 13 March to 17 March, 23 March to 27 March, and 28 March to 1 April.

Issued Mar 3

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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