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Central Highlands 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
29
high
30
high
31
Sep 1
2
low
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
low
24
25
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 the Indian Ocean, eastern Australia, New Zealand, 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 9 September to 13 September, 15 September to 19 September, and 26 September to 30 September. Rain events originating in the tropics and moving south are possible about 25 August to 29 August.
Over Western Australia the strongest cold fronts should occur about 10 September to 14 September, 23 September to 27 September, and 27 September to 1 October.

Issued Aug 27

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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