“Not infrequently in the wide skies over Yuma and other parts of the arid Southwest, residents watch sheets of rain begin to unfurl from auspicious purple storm clouds, backlit by the sun. But the rain stops halfway, hanging mid-horizon like a magician's trick. Known as rain streamers or by their scientific name VIRGA, the half-sheets evaporate into the dry air before the rain can reach the ground.” WeatherArizonaStormsDesertsUnfulfilled PromisesSonoran DesertDesert RainVirga Book:Rain: A Natural and Cultural History Source: Rain: A Natural and Cultural History