Holiday travel upended as forecasters warn of ‘bomb cyclone’

A man clears snow off a sidewalk Thursday in Minneapolis. (AP Photo/Abbie Parr)

Travelers check in at the American Airlines self ticket counters at O’Hare International Airport in Chicago on Thursday. (AP Photo/Nam Y. Huh)

MISSION, Kan. — Thousands of flights were canceled and homeless shelters were overflowing Thursday amid one of the most treacherous holiday travel seasons the U.S. has seen in decades, with temperatures plummeting 50 degrees Fahrenheit in some areas and forecasters warning of an impending “bomb cyclone” that could make conditions even worse before Christmas.