Southwest 28-day Rainfall Forecast

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

Issued Apr 5

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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