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South Coast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
med
24
25
low
26
27
low
28
med
29
low
30
Oct 1
low
2
low
3
4
low
5
low
6
high
7
low
8
9
high
10
med
11
12
13
med
14
15
16
17
low
18
low
19
20
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 Indian Ocean, eastern Australia, the south Pacific, the southeast Pacific, 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 28 September to 2 October, 20 October to 24 October, and 25 October to 29 October. Rain events originating in the tropics and moving south are possible about 23 October to 27 October.
Over Western Australia the strongest cold fronts should occur about 29 September to 3 October, 20 October to 24 October, and 25 October to 29 October.

Issued Sep 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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