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