Southwest Slopes 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
21
low
22
23
24
25
low
26
med
27
28
low
29
30
Dec 1
low
2
low
3
high
4
low
5
6
low
7
low
8
9
10
11
low
12
med
13
med
14
15
16
17
18
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, eastern Australia, New Zealand, the south 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 24 November to 28 November, 2 December to 6 December, and 6 December to 10 December. Rain events originating in the tropics and moving south are possible about 26 November to 30 November, 30 November to 4 December, and 4 December to 8 December.
Over Western Australia the strongest cold fronts should occur about 7 December to 11 December, 11 December to 15 December, and 17 December to 21 December.

Issued Nov 19

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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