Desert rains are usually so definitely demarked

Desert rains are usually so definitely demarked that the story of the man who washed his hands in the edge of an Arizona thunder shower without wetting his cuffs seems almost credible.  ~Administration in the State of Arizona, U.S. public relief program, 1935-1943, Arizona: A State Guide (The WPA Guide to Arizona), p323, Hastings House, 1940