Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 71,902 586,716 Rapid City, SD...Cheyenne, WY...Gillette, WY...Scottsbluff, NE...Sterling, CO...
MARGINAL 273,495 10,089,271 Denver, CO...Omaha, NE...Wichita, KS...Aurora, CO...Lincoln, NE...