Riverland 28-day Rainfall Forecast
low
med
low
low
med
med
med
low
low
low
low
low
low
high
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 six main troughs. Currently the most significant troughs are near the longitudes of South Africa, 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 14 December to 18 December, 18 December to 22 December, and 1 January to 5 January. Rain events originating in the tropics and moving south are possible about 11 December to 15 December, 15 December to 19 December, and 2 January to 6 January.
Over Western Australia the strongest cold fronts should occur about 15 December to 19 December, 21 December to 25 December, and 1 January to 5 January.
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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Weather News
La Nina making its presence felt
13:19 EDT
The southeast of the country is today witnessing what a La Niña summer looks like, with widespread storms, showers and strong winds forecast from South Australia across to Victoria and New South Wales. A vigorous trough is crossing the southeast, currently situated near the Victorian-South Australian border, and brought wind gusts close to 100km/h about elevated areas this morning.
Tropical activity ramping up in the northwest
11:24 EDT
Australia's northwest could be in for severe weather next week, with the possibility of the first tropical cyclone of the season forming over Australian waters.
