Central Coast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
22
high
23
med
24
high
25
med
26
med
27
28
med
29
30
med
31
low
Jun 1
2
low
3
med
4
low
5
6
med
7
low
8
9
low
10
low
11
low
12
med
13
14
15
16
med
17
med
18
low
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 six main troughs. Currently the most significant troughs are near the longitudes of the southwest Indian Ocean, Western Australia, eastern Australia, the south Pacific, 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 May to 30 May, 7 June to 11 June, and 20 June to 24 June. Rain events originating in the tropics and moving south are possible about 26 May to 30 May.
Over Western Australia the strongest cold fronts should occur about 4 June to 8 June, 8 June to 12 June, and 20 June to 24 June.

Issued May 20

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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