Upper South East 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
7
high
8
med
9
10
high
11
12
low
13
14
low
15
16
low
17
18
low
19
low
20
21
22
high
23
med
24
high
25
med
26
27
28
low
29
low
30
31
low
Jun 1
2
3
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, eastern Australia, the south Pacific, the southeast 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 26 May to 30 May, 2 June to 6 June, and 6 June to 10 June. Rain events originating in the tropics and moving south are possible about 28 May to 1 June.
Over Western Australia the strongest cold fronts should occur about 28 May to 1 June, 1 June to 5 June, and 5 June to 9 June.

Issued May 5

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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