Northeast 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
19
low
20
21
low
22
23
24
25
low
26
med
27
low
28
low
29
low
30
low
Jul 1
2
med
3
med
4
high
5
high
6
med
7
med
8
med
9
med
10
high
11
low
12
high
13
low
14
low
15
high
16
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 been relatively slow moving in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, Western Australia, New Zealand, the southeast 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 2 July to 6 July, 11 July to 15 July, and 18 July to 22 July. Rain events originating in the tropics and moving south are possible about 18 July to 22 July.
Over Western Australia the strongest cold fronts should occur about 2 July to 6 July, 12 July to 16 July, and 19 July to 23 July.

Issued Jun 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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