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Northern Rivers 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
22
low
23
24
low
25
low
26
27
low
28
29
med
30
31
low
Nov 1
med
2
med
3
med
4
low
5
low
6
low
7
low
8
low
9
low
10
11
12
13
med
14
15
low
16
low
17
low
18
high
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 eastern Australia, New Zealand, the southeast Pacific, South America, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 26 October to 30 October, 19 November to 23 November, and 24 November to 28 November. Rain events originating in the tropics and moving south are possible about 9 November to 13 November, 14 November to 18 November, and 18 November to 22 November.
Over Western Australia the strongest cold fronts should occur about 26 October to 30 October, 20 November to 24 November, and 24 November to 28 November.

Issued Oct 21

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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