BBSA
Honorary Master
- Joined
- Jul 11, 2005
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- People's Republic of South Africa
http://metzone.weathersa.co.za/images/PDF_docs/NFC-MEDIA RELEASE-5JUNE2011.pdf
South Africans should prepare themselves for a significant weather system that is expected to bring a wet and cold week with widespread, unseasonal rainfall that is likely to be heavy in some places. While snowfalls are expected on the mountains, at present the main feature of this weather system is the risk of heavy rainfall in some areas.
EXPECTED DEVELOPMENTS
Isolated, light showers and thundershowers are expected to start up in the central interior of the country on Monday afternoon. On Tuesday and Wednesday 7 and 8 June, rainfall is expected to spread to most parts of South Africa, with a risk of heavy falls of rain (greater than 50mm in 24 hours) in some areas.
Currently, the places most at risk of heavy rainfall on Tuesday 7 June are the North-West Province, Free State and eastern parts of the Northern Cape. On Wednesday 8 June, the risk of heavy rainfall may persist in these areas, while spreading to southern Gauteng, the Eastern Cape, eastern parts of the Western Cape and southern KwaZulu-Natal.
Significant snowfalls are likely on the mountains of Lesotho, the Drakensberg, and the north-eastern high ground of the Eastern Cape. Very windy conditions are expected in many parts of the interior on Tuesday and Wednesday.
There is presently uncertainty about the behaviour of this weather system as it exits the country later in the week. However, the eastern parts of the Western Cape, Eastern Cape and southern KwaZulu-Natal may still be at risk of heavy falls of rain on Thursday and Friday 9 and 10 June. The South African Weather Service will monitor the system closely as it develops.
Q: Is this weather system unusual?
A: Yes. Cut-off low pressure systems are common each year, but they tend to occur mostly during spring and autumn. They are less common in winter.
Q: Is this weather system linked to the recent La Nina episode and heavy rainfall experienced during the summer?
A: No. The “El Nino – Southern Oscillation” (ENSO) is currently in a neutral phase and expected to stay that way through the winter.
Q: Will the weather have cleared by next weekend?
A: There is some uncertainty about the behaviour of this weather system during the second half of the week, so keep up to date with the latest forecasts. Currently, indications are that it should have cleared in most areas, with possibly just a few isolated morning showers along the south and east coasts of the country
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