Lower West 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
med
24
low
25
26
low
27
low
28
low
29
30
31
Feb 1
2
3
4
5
6
7
8
low
9
low
10
low
11
low
12
low
13
low
14
low
15
low
16
low
17
18
19
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 slow 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, eastern Australia, South America, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 January to 31 January, 5 February to 9 February, and 25 February to 1 March. Rain events originating in the tropics and moving south are possible about 30 January to 3 February, 16 February to 20 February, and 25 February to 1 March.
Over Western Australia the strongest cold fronts should occur about 27 January to 31 January, 5 February to 9 February, and 25 February to 1 March.

Issued Jan 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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