Africa Wearther

Categorized | General

Summer rains to affect parts of South Africa today and tomorrow.

8am satellite this morning showing extensive cloud over NE areas of the country.

8am satellite this morning showing extensive cloud over NE areas of the country.

Total rainfall today (Thursday) and midnight air pressure.

Total rainfall today (Thursday) and midnight air pressure.

Total rainfall tomorrow(Friday) and midnight air pressure.

Total rainfall tomorrow(Friday) and midnight air pressure.

A low pressure system lying to the east of South Africa has, over the last 24 hours, introduced moist air into the eastern interior of the country. Evidence of this is the low cloud over areas of the highveld and Gauteng this morning.

Although moisture in the lower areas of the atmosphere is required for the formation of thunderstorms, it doesn’t necessary mean thunderstorms will occur as an unstable atmosphere and a trigger to release the instability are also required. Today and tomorrow we have the other two key ingredients – instability in the form of an upper low pressure system and the trigger will be the daytime heating of the earth’s surface by the sun.

These three ingredients will allow the moisture near the earths surface to rise rapidly into the upper atmosphere which will cause an unstable cloud layer – eventually leading to rain and thunderstorms.

Today, the upper low, which caused a few rumbles of thunder last night in Cape Town, will move east and lead to scattered thunderstorms over eastern areas of the Western Cape and into the Eastern Cape.

Ahead of the low pressure system, vast areas of the atmosphere will become unstable this afternoon over central and eastern parts of the Free State, KZN (particularly western parts) and SW parts of Mpumulanga. By late afternoon and overnight the instability will move into Gauteng and the North West.

Tomorrow the upper low will continue to move eastwards which will also push the area of thunderstorms into the Limpopo and the remainder of Mpumulanga. The thunderstorms are also expected to clear from the Free State.

Over all of these areas for the next couple of days there is the risk of heavy falls of rain due to energetic thunderstorms. Most partsĀ  are likely to see 5-10mm of rain but there may be up to 30-40mm in places.

AfricaWeather will continue to keep you posted on this weather event via our Twitter Feed and Facebook page.

AfricaWeather, Smarter Weather Insights.

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