Stewart began his broadcast career in radio in Ann Arbor, Michigan in 1961. He subsequently worked in such cities as Washington, D.C., Des Moines and Minneapolis, ending up in Tucson, where he worked at radio station KNST before making the jump to TV, taking over as weekend weather anchor at CBS affiliate KOLD in 1981, earning a degree in atmospheric physics from the University of Arizona while serving as the on-air weathercaster. Stewart made the move to NBC affiliate KVOA in 1990. Initially, he served as a morning and afternoon meteorologist, but moved into the Chief Meteorologist role after Michael Goodrich, the longtime meteorologist for KVOA, retired in June 1998.
