Melbourne 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
21
22
med
23
high
24
med
25
med
26
med
27
med
28
29
high
30
med
31
low
Nov 1
low
2
med
3
low
4
high
5
high
6
med
7
low
8
9
10
low
11
med
12
med
13
low
14
med
15
low
16
low
17
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, 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 26 October to 30 October, 2 November to 6 November, and 17 November to 21 November. Rain events originating in the tropics and moving south are possible about 25 October to 29 October, 29 October to 2 November, and 8 November to 12 November.
Over Western Australia the strongest cold fronts should occur about 27 October to 31 October, 2 November to 6 November, and 18 November to 22 November.

Issued Oct 20

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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Spring rain for the inland southeast

10:21 AEDT After a 2019 that couldn’t seem to rain even when the cloud was there, yet another rainfall event has affected the southern inland, bringing the heaviest October rain in a decade to parts of the Riverina and northeast Victoria.

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