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ACT 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
23
low
24
high
25
med
26
27
med
28
29
30
31
Nov 1
high
2
med
3
4
low
5
low
6
7
med
8
high
9
med
10
med
11
low
12
med
13
low
14
15
16
low
17
low
18
low
19
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 remained stable in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of the Indian Ocean, eastern Australia, 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 29 October to 2 November, 16 November to 20 November, and 24 November to 28 November. Rain events originating in the tropics and moving south are possible about 28 October to 1 November, 2 November to 6 November, and 22 November to 26 November.
Over Western Australia the strongest cold fronts should occur about 30 October to 3 November, 17 November to 21 November, and 24 November to 28 November.

Issued Oct 22

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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