Upper Western 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
11
12
13
14
15
16
17
low
18
low
19
low
20
21
22
23
24
25
26
27
low
28
29
30
med
31
med
Jun 1
2
3
4
low
5
low
6
low
7
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 fast moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 21 May to 25 May, 30 May to 3 June, and 4 June to 8 June. Rain events originating in the tropics and moving south are possible about 24 May to 28 May.
Over Western Australia the strongest cold fronts should occur about 1 June to 5 June, 5 June to 9 June, and 11 June to 15 June.

Issued May 9

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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