Southern Tablelands 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

Apr 1
high

2
high

3
med

4
low

5
low

6
low

7
low

8
low

14
low

15
low

16
low

19
low

20
low

21
low

22
low

23
low

24
low

26
med

27
low

28
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, the southeast Pacific, South America, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 13 April to 17 April, 19 April to 23 April, and 3 May to 7 May. Rain events originating in the tropics and moving south are possible about 21 April to 25 April, and 29 April to 3 May.
Over Western Australia the strongest cold fronts should occur about 7 April to 11 April, 20 April to 24 April, and 2 May to 6 May.

Issued Mar 30

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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