Riverina 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
25
med
26
27
28
29
30
31
Nov 1
2
low
3
low
4
5
6
7
8
9
10
low
11
12
13
14
15
16
low
17
18
19
low
20
low
21
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 four main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, Western 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 3 November to 7 November, 7 November to 11 November, and 22 November to 26 November. Rain events originating in the tropics and moving south are possible about 21 November to 25 November.
Over Western Australia the strongest cold fronts should occur about 3 November to 7 November, 7 November to 11 November, and 20 November to 24 November.

Issued Oct 23

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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