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South West 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
7
high
8
high
9
high
10
high
11
high
12
med
13
med
14
high
15
low
16
med
17
low
18
med
19
med
20
med
21
low
22
low
23
low
24
med
25
low
26
med
27
high
28
med
29
low
30
low
31
med
Jun 1
low
2
med
3
high
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 Indian Ocean, Western Australia, eastern Australia, the south 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 17 May to 21 May, 31 May to 4 June, and 9 June to 13 June. Rain events originating in the tropics and moving south are possible about 1 June to 5 June.
Over Western Australia the strongest cold fronts should occur about 12 May to 16 May, 17 May to 21 May, and 25 May to 29 May.

Issued May 6

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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