ACT 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

19
high

20
low

21
high

22
med

26
low

Sep 1

3
med

4
low

5
med

6
med

7
low

12
med

13
low

15
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 been relatively fast moving in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, Western Australia, New Zealand, the south Pacific, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 31 August to 4 September, 13 September to 17 September, and 17 September to 21 September. Rain events originating in the tropics and moving south are possible about 15 August to 19 August.
Over Western Australia the strongest cold fronts should occur about 31 August to 4 September, 4 September to 8 September, and 16 September to 20 September.

Issued Aug 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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