Arizona was hit by a rare snowstorm Monday, a day before spring officially starts. “Expect widespread snow across northern Arizona into Monday with extremely hazardous driving conditions, especially in the mountains,” the National Weather Service said, according to its warning. Flagstaff was hit by 10 to 14 inches of snow from the weekend, which prompted school closings Monday. The city of Prescott got 8 to 12 inches. Authorities had to close 180 miles of Interstate 40 in northern Arizona. But most of the U.S. will continue to enjoy unseasonably balmy temperatures.