Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 31,060 251,292 Cheyenne, WY...Gillette, WY...Scottsbluff, NE...Torrington, WY...Douglas, WY...
MARGINAL 76,358 4,251,489 Denver, CO...Colorado Springs, CO...Aurora, CO...Lakewood, CO...Fort Collins, CO...