Weather

Lower South East 28-day rainfall forecast

Sun Mon Tue Wed Thu Fri Sat
          20
High
 
21
Med
 
22
High
 
23
Low
 
24
Med
 
25
Low
 
26
 
 
27
High
 
28
 
 
29
Low
 
30
Low
 
1
Low
Oct
2
Low
 
3
 
 
4
 
 
5
Low
 
6
Low
 
7
Low
 
8
Low
 
9
 
 
10
 
 
11
Med
 
12
Med
 
13
 
 
14
 
 
15
Low
 
16
 
 
17
 
 
   

Chance of rainfall somewhere within district

Nil
<25%
Low
25-50%
Medium
50-75%
High
≥75%

Issue Notes

Issued 19 Sep 2019

The hemispheric long wave pattern has remained stable in recent weeks. There are six main troughs. Currently the most significant troughs are near the longitudes of the Indian Ocean, Western Australia, New Zealand, the south Pacific, 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 25 September to 29 September, 29 September to 3 October, and 9 October to 13 October. Rain events originating in the tropics and moving south are possible about 2 October to 6 October. Over Western Australia the strongest cold fronts should occur about 25 September to 29 September, 29 September to 3 October, and 10 October to 14 October.

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.