Wimmera 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
28
med
29
30
med
Dec 1
high
2
3
4
5
6
low
7
low
8
9
10
11
12
13
14
low
15
low
16
17
low
18
19
low
20
low
21
22
low
23
low
24
low
25
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 South Africa, the Indian Ocean, New Zealand, 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 5 December to 9 December, 12 December to 16 December, and 20 December to 24 December. Rain events originating in the tropics and moving south are possible about 1 December to 5 December, 8 December to 12 December, and 14 December to 18 December.
Over Western Australia the strongest cold fronts should occur about 5 December to 9 December, and 19 December to 23 December.

Issued Nov 26

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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