Deep freeze grips U.S. as 'bomb cyclone' looms

STORY: Heading into the Christmas holiday weekend, the looming storm was forecast to develop into a "bomb cyclone," unleashing heavy, blinding snow from the northern Plains and Great Lakes region to the upper Mississippi Valley and western New York.

Numbing cold intensified by high winds was expected to extend as far south as the U.S.-Mexico border.

Hard-freeze warnings were posted across the Gulf Coast states of Texas, Louisiana, Alabama and Florida, while significant icing was possible from a separate arctic blast hitting the Pacific Northwest.