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Melbourne 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
27
high
28
high
29
low
30
low
31
low
Jun 1
low
2
low
3
low
4
low
5
low
6
low
7
med
8
med
9
low
10
low
11
12
low
13
low
14
med
15
low
16
low
17
low
18
low
19
low
20
low
21
low
22
low
23
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, the Indian Ocean, New Zealand, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 3 June to 7 June, 12 June to 16 June, and 16 June to 20 June. Rain events originating in the tropics and moving south are possible about 2 June to 6 June, 6 June to 10 June, and 23 June to 27 June.
Over Western Australia the strongest cold fronts should occur about 3 June to 7 June, 11 June to 15 June, and 16 June to 20 June.

Issued May 26

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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