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NW Slopes & Plains 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
19
low
20
high
21
med
22
low
23
med
24
med
25
low
26
27
low
28
29
30
31
Nov 1
2
med
3
low
4
low
5
6
low
7
8
9
10
low
11
12
13
14
low
15
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 the southwest Indian Ocean, eastern Australia, the south 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 25 October to 29 October, 31 October to 4 November, and 11 November to 15 November. Rain events originating in the tropics and moving south are possible about 31 October to 4 November.
Over Western Australia the strongest cold fronts should occur about 23 October to 27 October, 31 October to 4 November, and 11 November to 15 November.

Issued Oct 18

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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