Southern Coastal 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
15
16
17
18
19
low
20
low
21
low
22
low
23
med
24
low
25
low
26
low
27
low
28
med
29
low
30
31
Jan 1
2
low
3
med
4
low
5
6
low
7
8
9
10
11
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 South Africa, the Indian Ocean, Western Australia, New Zealand, the southeast Pacific, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 23 December to 27 December, 30 December to 3 January, and 12 January to 16 January. Rain events originating in the tropics and moving south are possible about 26 December to 30 December, 31 December to 4 January, and 5 January to 9 January.
Over Western Australia the strongest cold fronts should occur about 23 December to 27 December, 28 December to 1 January, and 11 January to 15 January.

Issued Dec 14

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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