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ACT 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
24
25
26
27
28
low
29
med
30
med
31
low
Jun 1
2
3
4
5
low
6
7
high
8
low
9
med
10
med
11
high
12
med
13
med
14
low
15
16
17
low
18
med
19
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, Western 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 26 May to 30 May, 5 June to 9 June, and 15 June to 19 June. Rain events originating in the tropics and moving south are possible about 19 May to 23 May.
Over Western Australia the strongest cold fronts should occur about 27 May to 31 May, 9 June to 13 June, and 18 June to 22 June.

Issued May 21

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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