Lower Derwent 28-day Rainfall Forecast
med
high
med
med
low
med
high
high
med
low
high
med
high
high
high
med
high
med
high
high
high
high
| 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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, New Zealand, and the southeast Pacific.
Summary:
Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 24 October to 28 October, 12 November to 16 November, and 22 November to 26 November. Rain events originating in the tropics and moving south are possible about 26 October to 30 October, and 3 November to 7 November.
Over Western Australia the strongest cold fronts should occur about 24 October to 28 October, 30 October to 3 November, and 12 November to 16 November.
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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