Day 1 Risk Area (sq. mi.) Area Pop. Some Larger Population Centers in Risk Area
SLIGHT 75,111 1,051,784 Fort Collins, CO...Greeley, CO...Longmont, CO...Loveland, CO...Cheyenne, WY...
MARGINAL 225,563 13,110,856 Memphis, TN...Denver, CO...Colorado Springs, CO...Aurora, CO...Birmingham, AL...