Day 2 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 59,990 438,809 Rapid City, SD...North Platte, NE...Scottsbluff, NE...Sterling, CO...Spearfish, SD...
MARGINAL 250,065 40,808,044 Philadelphia, PA...Baltimore, MD...Denver, CO...Washington, DC...Colorado Springs, CO...