As millions of Americans hunker down for the winter storm, 19 states and Washington, D.C., have declared states of emergency.

A severe winter storm has prompted US airlines to cancel flights, issue travel waivers, and advise passengers on refund and rebooking options.

On Sunday at 11:57 p.m. the National Weather Service issued an updated winter storm warning in effect until Monday at noon for Mercer, Venango, Lawrence, Butler, Beaver, Allegheny, Washington and Greene counties.

Sledding in the street in Texas. Icicles all over the place. Here are some of the best photos and videos from the winter storm.

Roughly a million power outages were reported on Jan. 25 as a massive winter storm raged across the country, bringing "catastrophic" ice accumulation that downed power lines and created treacherous road conditions.

A winter storm brought heavy, powdery snow to Maryland on Sunday morning. By mid- to late morning, conditions changed to sleet and freezing rain.

The National Weather Service in State College has issued Winter Storm Warnings for all of central Pennsylvania through 1 p.m. Monday. It covers the following counties: Somerset, B

Snow, sleet and ice covered Memphis and much of Tennessee this weekend as a impactful winter storm entered the area.