Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 63,430 4,354,441 Des Moines, IA...Rockford, IL...Cedar Rapids, IA...Peoria, IL...Davenport, IA...
MARGINAL 154,721 20,661,055 Chicago, IL...Milwaukee, WI...Kansas City, MO...Omaha, NE...St. Louis, MO...