A lethal late-season mega snowstorm has enveloped the Colorado Rockies with as much as 2 feet of heavy, wet snowfall, while the Weather Prediction Center has issued warnings of an extensive hard freeze across the Southern High Plains this evening. Authorities are advising residents of Colorado to exercise caution when shoveling, as the snow's weight poses a risk for heart attacks. A new frontal system is beginning to develop over the Northern Plains and Rockies, potentially leading to storms later in the week across several states.