Darwin-Daly 28-day Rainfall Forecast
low
low
low
low
med
high
med
high
med
high
low
high
low
low
high
low
med
med
high
med
high
high
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high
high
med
med
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 five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the southwest Indian Ocean, the Indian Ocean, New Zealand, 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 19 December to 23 December, 24 December to 28 December, and 10 January to 14 January. Rain events originating in the tropics and moving south are possible about 27 December to 31 December, 5 January to 9 January, and 11 January to 15 January.
Over Western Australia the strongest cold fronts should occur about 19 December to 23 December, and 24 December to 28 December.
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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