The storm has caused severe air travel disruptions. According to FlightAware, more than 1,800 flights in and out of the U.S. have been canceled so far, including nearly 500 at Reagan National and more than 250 at Chicago's O'Hare International Airport, which issued a temporary ground stop earlier Monday due to snow and ice.

A major winter storm caused dangerous travel conditions and delays across the central and eastern U.S., including Washington D.C., as snow piled up.

Millions were under weather advisories as the storm stretched from southern Illinois to Washington, D.C. Snow could fall at 1-2 inches per hour.

A deadly winter storm is pummeling Washington, DC, and the mid-Atlantic Monday after causing hundreds of crashes and flight cancellations and knocking out power to hundreds of thousands in the central United States over the weekend.

Over 60 million people are being bombarded by heavy snowfall because of the "disruptive" winter storm moving through the area, according to the NWS.

As a deep winter chill begins to take over the northern half of the country, a new major winter storm will move across the U.S. this weekend into early next week.

Many of the same areas that just got walloped by Blair will receive another round of winter weather this week. Snow and ice spread across the South, Midwest and East. We break it down here.