Riverina 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
22
23
24
25
high
26
med
27
med
28
29
med
30
low
31
low
Sep 1
2
low
3
4
5
low
6
med
7
med
8
low
9
med
10
med
11
12
med
13
low
14
low
15
med
16
med
17
18
med
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 four main troughs. Currently the most significant troughs are near the longitudes of South Africa, Western Australia, New Zealand, the south Pacific, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 27 August to 31 August, 7 September to 11 September, and 13 September to 17 September. Rain events originating in the tropics and moving south are possible about 20 September to 24 September.
Over Western Australia the strongest cold fronts should occur about 27 August to 31 August, 4 September to 8 September, and 12 September to 16 September.

Issued Aug 21

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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