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Home › 28-day Rainfall Forecast › Northwest Rainfall Forecast

Northwest 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
30
31
Feb 1
2
3
4
low
5
6
7
low
8
9
10
11
12
13
14
15
16
17
low
18
19
20
21
low
22
low
23
low
24
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 remained stable in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, Western Australia, eastern Australia, 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 20 January to 24 January, 7 February to 11 February, and 15 February to 19 February. Rain events originating in the tropics and moving south are possible about 27 January to 31 January, 31 January to 4 February, and 4 February to 8 February.
Over Western Australia the strongest cold fronts should occur about 20 January to 24 January, 7 February to 11 February, and 16 February to 20 February.

Issued Jan 15

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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