Mid-west takes heavy snowfall in stride as Washington DC makes preparations for its biggest storm of the seasonA late-winter storm dumped heavy snow on the mid-western United States, disrupting highway and air travel on Tuesday as it moved east toward the Ohio Valley and the mid-Atlantic states. More than 1,000 flights were canceled in and out of Chicago's O'Hare and Midway airports and nearly 100 more were canceled in and out of Minneapolis-St.Paul International Airport, according to the FlightAware.com flight tracking service.