US weather: Storm sweeping across America and Canada grounds thousands of flightsA deadly winter storm sweeping across the Midwest to the East Coast, including parts of Canada, has caused more than 1,700 flights to be cancelled. The winter storm is responsible for the heavy mix of snow, ice, and heavy rain sweeping from Minnesota to Maine, and parts of southern Canada, on Tuesday morning. LaGuardia Airport in New York City had the worst impact with the storm, forced to cancel more than 470 flights scheduled to depart and arrive at the airport, which is about 40 per cent of its scheduled flights.