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R. A. Preston-Whyte

Abstract

Mean temperatures obtained from 28 midday motor traverses in the Durban area during the summer of,1968–69 show the center of the heat island to be displaced away from the central business district by the sea breeze. The spatial temperature wave across the center of the heat island is described by a simple harmonic model.

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P. D. Tyson and R. A. Preston-Whyte

Abstract

Observations are presented to show the occurrence of boundary layer oscillations in the form of widespread and large-scale topographically-induced mountain-plain and plain-mountain winds over the deeply dissected eastern plateau slopes of Natal. By night, extensive northwesterly advection of cool air occurs between the Drakensberg escarpment zone and the coast; by day, the flow is reversed and southeasterly inland advection is characteristic of clear, fine conditions. The distinctive temporal and spatial characteristics of regional winds correspond in a near-ideal manner to those expected in a thermodynamically direct circulation caused by the diurnal cycle of insolation.

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