Perth 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
19
20
21
22
23
24
25
26
27
28
low
29
low
30
low
31
low
Feb 1
low
2
low
3
low
4
5
6
7
low
8
9
low
10
11
low
12
low
13
14
15
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 three main troughs. Currently the most significant troughs are near the longitudes of South Africa, Western Australia, and the south Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 22 January to 26 January, 31 January to 4 February, and 5 February to 9 February. Rain events originating in the tropics and moving south are possible about 8 February to 12 February.
Over Western Australia the strongest cold fronts should occur about 22 January to 26 January, 31 January to 4 February, and 5 February to 9 February.

Issued Jan 17

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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More rain on the horizon for eastern, southeast Australia

14:52 AEDT Wet weather will continue to affect parts of eastern and southeastern Australia this weekend and early next week, with heavy rain and severe thunderstorms likely in some areas.

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