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Here's what to know about winter storm pummeling North America What to know about winter storm hitting North America
(about 11 hours later)
Watch: Snow blankets parts of New York and NebraskaWatch: Snow blankets parts of New York and Nebraska
More than 60 million Americans are under winter weather alerts as a huge winter storm is forecast to bring the heaviest snowfall and coldest temperatures in over a decade. A huge winter storm has brought snow, ice and and freezing temperatures to a broad swathe of the US, with more than 60 million Americans under weather alerts.
Much of Canada and 30 US states from Kansas to the East Coast are under weather alerts, the National Weather Service (NWS) said. Snowfall of 6-12in (15-30cm) is expected from Ohio to Washington DC. Forecasters say the extreme weather - named Storm Blair - is being caused by the polar vortex, an area of cold air that circulates around the Arctic.
A state of emergency has been declared in Kentucky, Virginia, West Virginia, Kansas, Arkansas and Missouri. Even parts of normally balmy Florida are expected to experience freezing conditions. A state of emergency has been declared in seven US states, with much of Canada also under weather alerts, as the blizzard conditions have dumped about a foot of snow (30cm) in places.
Forecasters say the extreme weather is being caused by the polar vortex, an area of cold air that circulates around the Arctic. Thousands of flights have been cancelled or delayed, as forecasters say the winter storm could bring the heaviest snowfall and coldest temperatures in more than a decade.
Watch: Heavy snow as severe US winter storm moves eastWatch: Heavy snow as severe US winter storm moves east
After blanketing the Central Plains, the storm is expected to hit the US East Coast by Sunday evening. Thirty US states, spanning from the middle of the country to the east coast - including major cities such as Washington DC and Philadelphia - are under weather alerts, the National Weather Service (NWS) said.
Parts of upstate New York have experienced at least 3ft of snow so far. A state of emergency has been declared in the states of Kansas, Missouri, Kentucky, Virginia, West Virginia, Arkansas and parts of New Jersey.
Sunday was forecast to be the most intense day of the storm for many of the affected states, cutting off roads, shutting down schools and forcing the cancellation of thousands of flights.
Blizzard warnings have been issued in Kansas, Missouri and Nebraska.
Kansas City is seeing its heaviest snow in 32 years, with more than a foot (30 to 40cm) having come down so far, according to Matthew Cappucci, a senior meteorologist at the weather app MyRadar.
Parts of northern Missouri have already experienced 14in (36cm) of sleet and snow.
Follow live updates on this storyFollow live updates on this story
How to drive in snow and icy weatherHow to drive in snow and icy weather
Washington DC is bracing for between 5-9in of snow. The city's mayor has declared a snow emergency until at least Sunday evening. The storm has begun easing as it moves towards the US's east coast, with parts of Virginia, Maryland, Washington DC and Delaware due to take the brunt of the weather on Monday.
Congress is due to meet on Monday afternoon to certify Donald Trump's victory in the US presidential election three months ago, but it is unclear if the foul weather could delay some lawmakers returning to the capital from their constituencies. Washington DC was bracing for heavy snow and bitter cold on Monday, the same day the US Congress is set to meet and formally certify Republican Donald Trump's election as president.
The Annapolis area near Baltimore, Maryland, could see 8-12in of snow, the NWS predicts. Republican House Speaker Mike Johnson said the weather would not prevent lawmakers from carrying out their duties. But officials have announced that federal offices in the nation's capital will be closed.
Blizzard warnings have been issued in Kansas, Missouri and Nebraska.
Parts of northern Missouri have already experienced 14in of sleet and snow, while Kansas has had 10in.
A cargo jet parked in the snow at Louisville airport on SundayA cargo jet parked in the snow at Louisville airport on Sunday
"For locations in this region that receive the highest snow totals, it may be the heaviest snowfall in at least a decade," the NWS said on Sunday. The NWS said the winter storm could bring "the heaviest snowfall in at least a decade", while AccuWeather forecaster Dan DePodwin said: "This could lead to the coldest January for the US since 2011."
AccuWeather forecaster Dan DePodwin said: "This could lead to the coldest January for the US since 2011."
He added that "temperatures that are well below historical average" could linger for a week. Temperatures 12-25F (7-14C) below normal are forecast.He added that "temperatures that are well below historical average" could linger for a week. Temperatures 12-25F (7-14C) below normal are forecast.
Severe travel delays are expected. Nearly 1,500 flights into and out of the US have been cancelled and nearly 5,000 more delayed, according to FlightAware.com. More than 1,700 flights into and out of the US were cancelled on Sunday and about 8,300 more were delayed, according to FlightAware.com.
Kentucky firefighters shovel snowKentucky firefighters shovel snow
Amtrak has also cancelled numerous train services.Amtrak has also cancelled numerous train services.
American, Delta, Southwest and United airlines are waiving change fees for passengers because of the potential flight disruptions.American, Delta, Southwest and United airlines are waiving change fees for passengers because of the potential flight disruptions.
Further north, Canadians are also feeling the effects of the polar vortex.Further north, Canadians are also feeling the effects of the polar vortex.
Much of Canada is under extreme weather alerts this weekend with frigid temperatures spanning the country. Much of Canada has been under extreme weather alerts, with freezing temperatures spanning the country.
Some areas are also seeing snow squalls - a sudden heavy snowfall accompanied by strong winds.Some areas are also seeing snow squalls - a sudden heavy snowfall accompanied by strong winds.
In the central province of Manitoba, the wind chill could see temperatures plummet to as low as -40C.In the central province of Manitoba, the wind chill could see temperatures plummet to as low as -40C.
Meanwhile, parts of Ontario could see as much as 15in of snow on Sunday. Meanwhile, as much as 15in (38cm) of snow was expected in parts of Ontario on Sunday.
A deserted highway in Shawnee, Kansas, on SundayA deserted highway in Shawnee, Kansas, on Sunday
Conditions on roads have already deteriorated, with crashes involving lorries and cars, as well as a fire engine rolling over near Salina, Kansas. Conditions on roads have deteriorated, with crashes involving lorries and cars, as well as a fire engine rolling over near Salina, Kansas.
"Whiteout conditions will make travel extremely hazardous, with impassable roads and a high risk of motorists becoming stranded," the NWS warned."Whiteout conditions will make travel extremely hazardous, with impassable roads and a high risk of motorists becoming stranded," the NWS warned.
Meanwhile, severe thunderstorms capable of producing tornadoes will move east from Arkansas and Louisiana into Mississippi and Alabama on Sunday evening, the NWS said. Meanwhile, severe thunderstorms capable of producing tornadoes were set to move east from Arkansas and Louisiana into Mississippi and Alabama on Sunday evening, the NWS said.
Private meteorologist Ryan Maue said: "It's going to be a mess, a potential disaster. This is something we haven't seen in quite a while."Private meteorologist Ryan Maue said: "It's going to be a mess, a potential disaster. This is something we haven't seen in quite a while."
How have you been affected by the storm? Share your experiences by following this link.How have you been affected by the storm? Share your experiences by following this link.
Get in touchGet in touch
How has the winter storm affected you? Tell us your experience.How has the winter storm affected you? Tell us your experience.