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Roper-McArthur 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
18
med
19
med
20
med
21
med
22
med
23
24
low
25
low
26
low
27
med
28
high
29
high
30
high
31
high
Feb 1
med
2
low
3
low
4
med
5
high
6
7
8
9
low
10
low
11
med
12
med
13
14
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 fast moving in recent weeks. There are four main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, Western Australia, the south Pacific, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 25 January to 29 January, 2 February to 6 February, and 13 February to 17 February. Rain events originating in the tropics and moving south are possible about 28 January to 1 February, 3 February to 7 February, and 8 February to 12 February.
Over Western Australia the strongest cold fronts should occur about 22 January to 26 January, 30 January to 3 February, and 13 February to 17 February.

Issued Jan 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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