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Northwest Coast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
29
low
30
high
Dec 1
high
2
med
3
med
4
med
5
high
6
med
7
8
9
low
10
med
11
med
12
13
low
14
15
16
17
med
18
med
19
20
low
21
med
22
med
23
med
24
low
25
low
26
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 five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, the south Pacific, 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 3 December to 7 December, 8 December to 12 December, and 31 December to 4 January. Rain events originating in the tropics and moving south are possible about 4 December to 8 December, 10 December to 14 December, and 14 December to 18 December.
Over Western Australia the strongest cold fronts should occur about 3 December to 7 December, 18 December to 22 December, and 31 December to 4 January.

Issued Nov 28

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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