East Coast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
8
med
9
10
high
11
med
12
high
13
high
14
high
15
low
16
low
17
low
18
19
low
20
low
21
low
22
23
24
med
25
med
26
low
27
28
high
29
med
30
low
31
Jun 1
low
2
med
3
4
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 remained stable in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, eastern Australia, 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 22 May to 26 May, 26 May to 30 May, and 3 June to 7 June. Rain events originating in the tropics and moving south are possible about 5 June to 9 June, and 9 June to 13 June.
Over Western Australia the strongest cold fronts should occur about 23 May to 27 May, 27 May to 31 May, and 31 May to 4 June.

Issued May 7

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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