Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 79,785 10,402,449 Minneapolis, MN...Cincinnati, OH...St. Paul, MN...Lexington-Fayette, KY...Dayton, OH...
MARGINAL 499,384 26,020,403 Phoenix, AZ...Columbus, OH...Denver, CO...Nashville, TN...Tucson, AZ...