US National Weather Service News
Severe weather unleashed one of many possible tornadoes that threatened the Southern United States on Sunday afternoon.
The San Francisco Bay area could be hit by flash flooding and falling trees as saturated ground gets up to 8 inches more rain and strong winds blow in, the weather service said.
The death toll rose from a previous 12 after at least nine more people in Chicago were reported to have died from cold-related injuries.
The polar vortex is a mass of freezing air that normally spins around the North Pole, but has slipped southward and swirled into the United States.
The FlightAware.com flight tracking website reported 1,431 flight cancellations on Friday and 12,465 delays, with problems at snow-hit airports like Denver causing knock-on effects around the country.
A winter storm bringing heavy winds and snow hit the US New England region on Thursday, with some areas expected to see as much as 18 inches (46 cms) of snowfall, the US National Weather Service said.
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