A severe Monsoon storm brought heavy rain, large hail and knocked out power to areas just south of Flagstaff Monday. The storm popped up and became severe just before 3 p.m. The storm dropped golf ball-sized hail in Mountainaire and along Lake Mary Road. The hail caused damage to many vehicles. The damage included large dents, broken windshields and more. The storm also knocked out power for over 650 customers along Lake Mary Road. Forecasters are expecting showers and thunderstorms again Tuesday and Wednesday.