Fairfax Media Network

Perth 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
28
29
30
med
May 1
2
3
4
5
low
6
med
7
low
8
9
med
10
med
11
low
12
low
13
low
14
15
16
17
18
19
20
low
21
22
med
23
low
24
low
25
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 South Africa, the Indian Ocean, eastern Australia, New Zealand, the south Pacific, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 14 May to 18 May, 21 May to 25 May, and 26 May to 30 May. Rain events originating in the tropics and moving south are possible about 9 May to 13 May, 15 May to 19 May, and 30 May to 3 June.
Over Western Australia the strongest cold fronts should occur about 8 May to 12 May, 22 May to 26 May, and 26 May to 30 May.

Issued Apr 27

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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