the beltway. federal officials were taking no chances. the nation s capital closed for business. federal offices shuttered. and the president s schedule scaled back as the city braces for accumulations of up to 10 inches of snow. as far west as iowa, winter weather plagued commuters. traffic on i-80 was backed up for hours after this tractor-trailer jack-knifeded, leading to multiple collisions of cars crashing into this ditch. lake-effect snow continues to wallop the midwest with parts of indiana in near whiteout conditions. snow was falling up to 2 inches per hour. chicago also hit with lake-effect snow, more than 8 inches overnight. and today massive winds swept into the windy city, shown here in this time lapse photography, bringing with them even more frigid air. wind chill factors will be dragging temperatures into the negative teens. these are extremely dangerous conditions that we expect to