CW Slopes & Plains 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
7
low
8
low
9
low
10
med
11
med
12
low
13
14
15
16
17
18
19
20
21
22
23
low
24
25
med
26
med
27
low
28
29
low
30
low
31
Jun 1
2
low
3
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, the Indian Ocean, Western Australia, the south Pacific, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 22 May to 26 May, 2 June to 6 June, and 7 June to 11 June. Rain events originating in the tropics and moving south are possible about 30 May to 3 June, and 3 June to 7 June.
Over Western Australia the strongest cold fronts should occur about 22 May to 26 May, 5 June to 9 June, and 9 June to 13 June.

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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