Millions of Americans from the Ohio Valley to the mid-Atlantic are bracing for a wintry Monday with heavy snowfall, ice, rain and storms, which are forecast to disrupt morning commutes and snarl airline schedules across the East Coast.

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.

Through midday, the winter storm dropped approximately 6 inches of snow across portions of the city, with forecasts predicting up to 12 inches as snow continues to fall through Monday night.