ACT 28-day Rainfall Forecast

Sun
Mon
Tue
Wed
Thu
Fri
Sat
22
low
23
med
24
high
25
med
26
low
27
28
low
29
low
30
31
Apr 1
med
2
med
3
4
low
5
low
6
low
7
8
low
9
10
low
11
12
13
14
low
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 remained stable in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, Western Australia, eastern Australia, 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 March to 30 March, 5 April to 9 April, and 13 April to 17 April. Rain events originating in the tropics and moving south are possible about 25 March to 29 March.
Over Western Australia the strongest cold fronts should occur about 27 March to 31 March, 7 April to 11 April, and 19 April to 23 April.

Issued Mar 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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