Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 55,916 13,590,148 Chicago, IL...Aurora, IL...Rockford, IL...Naperville, IL...Joliet, IL...
MARGINAL 279,347 16,943,398 Milwaukee, WI...Omaha, NE...Minneapolis, MN...St. Paul, MN...Lincoln, NE...