A significant winter storm is forecast to bring snow, sleet, and freezing rain from Colorado to the Great Lakes, with Iowa and Wisconsin expected to see a mix of precipitation. The storm's intensification will lead to increased winds, potential whiteouts, and nearly a foot of snow in some areas, causing slippery travel. Meanwhile, warmer temperatures and dry weather prevail in the Southeast, while thunderstorms with damaging winds and hail are possible in the southern Ohio and Mississippi Valleys.