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Lower Western 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
16
17
18
19
low
20
high
21
low
22
med
23
24
25
low
26
27
28
low
29
30
Dec 1
2
3
4
5
low
6
low
7
low
8
low
9
10
11
12
13
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 seven main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, New Zealand, 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 20 November to 24 November, 24 November to 28 November, and 16 December to 20 December. Rain events originating in the tropics and moving south are possible about 20 November to 24 November, 27 November to 1 December, and 12 December to 16 December.
Over Western Australia the strongest cold fronts should occur about 20 November to 24 November, 5 December to 9 December, and 17 December to 21 December.

Issued Nov 15

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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