Rainy season extreme weather: rain and thunderstorms all over South Africa: Pretoria, Williston and Danielskuil in Northern Cape, Gariep Dam and a bit of Windhoek in Namibia. Part 2.

#SouthAfricaExtremeWeather #RainySeasonAfrica #AfricaThunderstorms

Most of South Africa is a summer rainfall area, November to March, while the Western Cape Province receives most of its rain during winter, May to August. Over most of South Africa, there is a definite rainfall pattern with rainfall increasing from west to east.

This is illustrated by the yearly rainfall difference between Port Nolloth on the west coast, 50 mm and Richards Bay, 1000 mm at the same latitude on the east coast. The interior plateau, the eastern Free State, KwaZulu-Natal, Eastern Cape and Mpumalanga Provinces receive almost all its rain as thunderstorms (convective rains).

These convective rains develop because all these areas have enough heat in summer. In short, this warm moist air rises, cools down, then condensates and precipitates as thunderstorms. In the western part of South Africa, the rainfall is low because there is not enough moisture in the atmosphere for convective rains. Also, there is no significant orographic rain effect in the mountains along the western escarpment.

This is because air from the cold sea current do not hold most moisture and the coastal winds blow parallel to the mountains. Orographic rain is formed when moist winds are forced up the side of a mountain.

Timecodes:

Bianca Sutherland, Pretoria: 0:14
Chris Esterhuyse, Northern Cape: 0:19
Deon Nel, Gariep Dam: 0:26
Jaco Van Niekerk, Northern Cape: 2:09

Thanks to all our wonderful contributors:

Bianca Sutherland:
https://www.facebook.com/bianca.sutherland.754
Chris Esterhuyse:
https://www.facebook.com/chris.esterhuyse.9
Deon Nel:
https://www.facebook.com/deon.nel.31
Jaco Van Niekerk:
https://www.facebook.com/jaco.vanniekerk.106

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