INDIANAPOLIS: A blast of snow, gusty winds and plunging temperatures in the U.S. midwest created headaches for travellers on Tuesday with cancelled flights and slick, slushy roads. The National Weather Service issued a winter storm warning from parts of Iowa and Missouri east to cover most of Illinois and parts of central and northern Indiana. The storm packing strong winds and a blast of Arctic air was expected to reach New York later on Tuesday. Snow was already falling in the mid-Atlantic states by midmorning. Chicago's O'Hare International Airport cancelled over 400 flights on Tuesday, said a spokeswoman. Northeast Ohio is expecting up to 10 inches of snow on Tuesday, plus 10 more by Wednesday night, when temperatures were expected to plummet to low single digits (below zero degrees Celsius).