Prior to the return of warmer weather, an ice storm will affect areas from northern and eastern Missouri to Michigan, southern Ontario and the mid-Atlantic spanning this weekend into the start of next week.
A storm bringing rain to Southern California to end this week will roll into a zone of departing Arctic air and cold ground over the Midwest.
Major cities that have the potential for a period of freezing this weekend include Omaha, Neb.; St. Louis, Mo.; Des Moines, Iowa; Madison, Wis.; Chicago, Ill.; Indianapolis, Ind.; Detroit, Mich.; Pittsburgh, Pa.; and London, Ontario.