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ACT 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
2
3
med
4
med
5
low
6
med
7
8
9
high
10
med
11
low
12
low
13
low
14
med
15
low
16
low
17
med
18
low
19
med
20
21
med
22
med
23
24
low
25
low
26
med
27
28
low
29
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 been relatively fast moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, the Indian Ocean, the south Pacific, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 7 June to 11 June, 15 June to 19 June, and 4 July to 8 July. Rain events originating in the tropics and moving south are possible about 12 June to 16 June, and 22 June to 26 June.
Over Western Australia the strongest cold fronts should occur about 8 June to 12 June, 13 June to 17 June, and 26 June to 30 June.

Issued May 31

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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