Winter storms shut down much of Portland

Winter storms sowed more chaos across the U.S. on Thursday, shutting down much of Oregon's largest city with almost a foot of snow and paralyzing travel from parts of the Pacific Coast all the way to the northern Plains. The nearly 11 inches that fell in Portland amounted to the second snowiest day in the city's history.  

The weather also knocked out power to almost a million homes and businesses in multiple states, closed schools and grounded or delayed thousands of flights. The system even brought snow to usually balmy Southern California.

Weather also contributed to another day of problems at the nation's airports. By Thursday afternoon, more than 2,000 flights were canceled and nearly 14,000 were delayed across the country, according to the tracking service FlightAware.