I found this bit of information on this local weather phenomenon @ 1stweather.com.
"The Black South-Easter is a much misinterpreted phenomenon. It is refered to as a "BLACK" SE event when the SE wind is blowing, usually rather strongly, and it is raining at the same time. A Black SE usually is caused by a deep low pressure system over the SW Cape both in the upper air and on the surface and a very strong/intense SAH south of the country. The Laingsburg Floods and the Easter of 1994 are prime examples of Black South-easters in Cape Town. The tight pressure gradient between the systems cause the wind and the low pressure systems produce the rain. These Black SE events usually occur during spring and autumn, the months when the incidence of cut-off low pressure systems are high. "
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