Southwest 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
24
med
25
med
26
high
27
high
28
med
29
Mar 1
low
2
3
4
5
low
6
med
7
low
8
9
10
11
12
13
med
14
low
15
16
low
17
high
18
low
19
20
low
21
22
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 five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, 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 11 March to 15 March, 20 March to 24 March, and 24 March to 28 March. Rain events originating in the tropics and moving south are possible about 6 March to 10 March.
Over Western Australia the strongest cold fronts should occur about 4 March to 8 March, 11 March to 15 March, and 25 March to 29 March.

Issued Feb 22

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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