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Dry tropical (4a) / Hot Low-Latitude Desert (BWh) climate regions.  Note Wadi Halfa, Sudan, in the Sahara Desert of NE Africa.  The descending, drying air of the Subtropical High has a strong influence in these climate zones, producing hot deserts.   Climograph for Wadi Halfa, Sudan, in the Sahara Desert of NE Africa, Tropical dry (BW) climate