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Upper Derwent 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
30
high
Jul 1
high
2
high
3
high
4
med
5
med
6
med
7
low
8
med
9
low
10
low
11
high
12
low
13
low
14
low
15
low
16
med
17
med
18
med
19
med
20
med
21
med
22
low
23
24
high
25
high
26
high
27
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 southwest Indian Ocean, eastern Australia, New Zealand, the south Pacific, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 2 July to 6 July, 8 July to 12 July, and 14 July to 18 July. Rain events originating in the tropics and moving south are possible about 20 July to 24 July, and 27 July to 31 July.
Over Western Australia the strongest cold fronts should occur about 2 July to 6 July, 10 July to 14 July, and 25 July to 29 July.

Issued Jun 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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