ACT 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
18
19
20
21
22
23
24
25
26
27
med
28
med
29
low
30
31
low
Nov 1
med
2
med
3
low
4
low
5
6
7
8
low
9
low
10
high
11
12
13
14
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, eastern Australia, New Zealand, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 25 October to 29 October, 29 October to 2 November, and 7 November to 11 November. Rain events originating in the tropics and moving south are possible about 15 October to 19 October.
Over Western Australia the strongest cold fronts should occur about 25 October to 29 October, 30 October to 3 November, and 7 November to 11 November.

Issued Oct 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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