Brisbane 28-day Rainfall Forecast

Sun

Mon

Tue

Wed

Thu

Fri

Sat

22
med

26
low

27
low

28
low

29
med

30
med

31
low

Jan 1
low

2
low

3
low

7
low

8
low

12
low

13
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 slow moving in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, New Zealand, the southeast 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 21 December to 25 December, 9 January to 13 January, and 15 January to 19 January. Rain events originating in the tropics and moving south are possible about 24 December to 28 December, and 30 December to 3 January.
Over Western Australia the strongest cold fronts should occur about 21 December to 25 December, and 16 January to 20 January.

Issued Dec 16

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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