Sun
Mon
Tue
Wed
Thu
Fri
Sat
24
med
25
26
27
28
29
30
31
low
Jun 1
med
2
med
3
med
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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 four main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, New Zealand, and South America.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 24 May to 28 May, 6 June to 10 June, and 17 June to 21 June. Rain events originating in the tropics and moving south are possible about 22 May to 26 May, 1 June to 5 June, and 18 June to 22 June.
Over Western Australia the strongest cold fronts should occur about 24 May to 28 May, 9 June to 13 June, and 17 June to 21 June.
Issued May 23
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.