Sun
Mon
Tue
Wed
Thu
Fri
Sat
8
9
10
11
12
13
14
low
15
16
low
17
low
18
low
19
low
20
21
low
22
23
low
24
low
25
med
26
low
27
28
low
29
low
30
low
31
low
Aug 1
low
2
low
3
4
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, Western Australia, eastern Australia, New Zealand, and the Atlantic Ocean.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 17 July to 21 July, 21 July to 25 July, and 2 August to 6 August. Rain events originating in the tropics and moving south are possible about 26 July to 30 July, 31 July to 4 August, and 7 August to 11 August.
Over Western Australia the strongest cold fronts should occur about 17 July to 21 July, 21 July to 25 July, and 2 August to 6 August.
Issued Jul 7
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.