Southeast Coast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
24
25
26
27
28
med
29
med
30
low
Oct 1
med
2
low
3
low
4
5
med
6
low
7
8
med
9
low
10
low
11
12
13
low
14
low
15
low
16
17
18
low
19
low
20
low
21
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 five 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 South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 29 September to 3 October, 14 October to 18 October, and 26 October to 30 October. Rain events originating in the tropics and moving south are possible about 29 September to 3 October.
Over Western Australia the strongest cold fronts should occur about 29 September to 3 October, 3 October to 7 October, and 26 October to 30 October.

Issued Sep 23

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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