Wimmera 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
18
19
low
20
high
21
low
22
med
23
high
24
25
low
26
27
med
28
med
29
med
30
Oct 1
2
low
3
low
4
low
5
6
low
7
med
8
low
9
10
low
11
med
12
low
13
low
14
low
15
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 the southwest Indian Ocean, the Indian Ocean, eastern Australia, 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 26 September to 30 September, 7 October to 11 October, and 20 October to 24 October. Rain events originating in the tropics and moving south are possible about 23 September to 27 September.
Over Western Australia the strongest cold fronts should occur about 26 September to 30 September, 7 October to 11 October, and 20 October to 24 October.

Issued Sep 16

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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How did it snow so low in NSW and the ACT?

08:20 AEST Snow fell to low levels in NSW and the ACT overnight, with a few flakes even reaching Canberra.

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