A powerful winter storm is bringing heavy snow and blizzard conditions to parts of the Central Plains through Tuesday. Blizzard warnings extend from Colorado to the Dakotas, with 2-10 inches of snow forecast and over a foot in some areas. Travel could become "nearly impossible" in warned areas due to icy roads and whiteout conditions. Widespread power outages are a concern from wind and heavy, wet snow bringing down trees and lines. A rare geomagnetic storm made the Northern Lights visible overnight in the Northwest, Plains, and Great Lakes.