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Great Southern 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
24
low
25
26
27
28
29
30
31
Nov 1
2
low
3
low
4
low
5
6
7
low
8
low
9
med
10
med
11
low
12
13
low
14
low
15
low
16
med
17
low
18
low
19
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 the Indian Ocean, Western Australia, the south Pacific, the southeast 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 October to 2 November, 9 November to 13 November, and 25 November to 29 November. Rain events originating in the tropics and moving south are possible about 4 November to 8 November, 8 November to 12 November, and 13 November to 17 November.
Over Western Australia the strongest cold fronts should occur about 2 November to 6 November, 12 November to 16 November, and 23 November to 27 November.

Issued Oct 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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