National Geographic : 1952 Jan
151 Arnold Heim, National Aerophotographic Service ofPeru Rain Almost Never Falls on Peru's Pampa de Chunchanga. Dry Winds Drive Crescent Dunes Across the Desert The Andes block Atlantic rain clouds, but the coastal plain lies open to the Pacific's dry winds. Years pass with hardlyaspeck of moisture; suddenly atorrent falls. Vagaries of the cold Humboldt (or Peru) Current are held accountable for droughtsand floods.