Winter storm to bring blizzard conditions, frigid temps to millions

Winter has arrived.

A blockbuster blizzard is set to spread a multitude of weather hazards – and holiday travel chaos – across the central and eastern United States to mark the winter solstice.

As a strong arctic cold front begins diving into the central Plains on Wednesday and the southern Plains by early Friday, forecasters warn temperatures could dip by 20 or more degrees within just a few hours.

More than 34 million Americans were under a wind chill warning Wednesday as brutal cold and dangerous wind chills threatened the northern Plains en route to the East Coast by Friday.

"This storm really means business in the Midwest and Great Lakes," AccuWeather senior meteorologist Tom Kines told USA TODAY.

Tempted to joke about global warming amid a blizzard?:Here's what experts say about that.

Much of the eastern two-thirds of the country can expect heavy snow, damaging winds and even some heavy rainfall to accompany the extreme cold through the holiday weekend, according to the National Weather Service.

Here’s what to know about the pre-holiday storm:

What are the snowstorm's expected impacts?

Midwest: Midwestern U.S. states into the Great Lakes can expect blizzard conditions from snow and strong winds, and light to moderate snowfall is forecast. Heavier snow could exceed a foot over the Great Lakes through Friday. St. Louis, Detroit and Chicago will all be hit. “The big deal in these areas is not the amount of snow, but the extreme cold accompanying the snow and the extreme wind,” Kines said.
Northeast: Mostly rain is expected ahead of the storm system Thursday and Friday in the East, according to AccuWeather. “The cold air is racing eastward, and once the rain ends in a lot of spots, temperatures will plummet,” Kines said. That could lead to a rapid freeze in areas such as New York City by Friday. Combined with the new moon tide cycle, dangerous coastal flooding could occur from northern New Jersey to northeast Massachusetts, according to the National Weather Service.
South: More than 4.4 million people were under a weather service-issued hard-freeze warning in parts of Louisiana, Alabama and Mississippi. “Even all the way down into Texas and eventually Florida will receive some of this cold,” Kines said. Widespread subzero wind chills may creep into Texas and parts of the Deep South through the week's end, the weather service said.

TRAVEL IMPACTS:Flight cancellations expected to mount as winter storm moves across the Plains and Midwest

LONGER DAYS AHEAD:What to know about the winter solstice

How will the snowstorm affect holiday travel?

As more than 112 million people prepared to travel at least 50 miles for the holidays, according to AAA, the storm – expected to rapidly intensify into what's known as a bomb cyclone this week, essentially a winter hurricane – could create dangerous air and road travel, forecasters predicted.

Wind gusts over 50 mph and snow were expected to unleash blizzard conditions over the northern and central Plains through the Great Lakes, according to the National Weather Service. The combination could make for treacherous travel regardless of whether heavy snow is falling.

WHAT IS A BOMB CYCLONE? A winter hurricane, explained

The worst air travel delays Wednesday were expected in major hubs such as Minneapolis and Denver amid the increasingly potent storm, AccuWeather said. Plummeting temperatures also could create flash-freeze conditions on roads where standing water doesn’t dry quickly, according to the weather service.

SNOWSTORM ON THE WAY:Pre-Christmas blizzard expected to wallop northern US could strengthen into a bomb cyclone

Blizzard's low temperatures could break records

A low-pressure system developing along the storm’s frontal boundary is expected to strengthen rapidly by Thursday night over eastern Michigan, the National Weather Service said.

The rapid strengthening could lead to record-breaking frigid temperatures over parts of the Gulf Coast and eastern U.S. by Friday, according to meteorologists.

"Across Montana, Wyoming, North Dakota, there are probably going to be some record lows set up there," Kines said.

WHAT DEFINES A BLIZZARD?Heavy snow and high winds expected to sweep across country

WHAT IS THUNDERSNOW?Explaining how a thunderstorm can produce snow

Staying safe in life-threatening cold temps

Meteorologists expect the most widespread weather hazard over the next few days to be related to the extremely cold air mass set to chill the central and eastern parts of the U.S.

Wind-chill values could drop as low as minus 70 degrees across the central High Plains, according to the National Weather Service. This level of cold could cause frostbite on exposed skin within minutes, hypothermia and even death during prolonged exposure, forecasters warned.

WHAT IS WIND CHILL?Understanding the wind chill index and how it's calculated

“We can’t tell people not to go outside, but your best bet is to stay indoors,” Kines said.

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Winter storm to bring blizzard conditions, frigid temps to millions

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