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| North America arctic blast creeps east | North America arctic blast creeps east |
| (about 4 hours later) | |
| North America's brutal cold snap is heading east, ushering in dangerous temperatures not seen in two decades, warn forecasters. | North America's brutal cold snap is heading east, ushering in dangerous temperatures not seen in two decades, warn forecasters. |
| From Montana to Maryland, about half of the US population has been placed under a wind chill warning or advisory. | From Montana to Maryland, about half of the US population has been placed under a wind chill warning or advisory. |
| In Canada, the province of Ontario is facing temperatures of -40C (-40F) with wind chill. | In Canada, the province of Ontario is facing temperatures of -40C (-40F) with wind chill. |
| Thousands of flights have been grounded, and residents told their skin could freeze if they go outside. | Thousands of flights have been grounded, and residents told their skin could freeze if they go outside. |
| People on the US north-east coast were warned to prepare themselves for the cold front sweeping in on Tuesday from the Midwest. | People on the US north-east coast were warned to prepare themselves for the cold front sweeping in on Tuesday from the Midwest. |
| Temperatures were set to plummet overnight in New York and Washington DC by as much as 45 degrees, from unseasonably clement highs a day earlier. | Temperatures were set to plummet overnight in New York and Washington DC by as much as 45 degrees, from unseasonably clement highs a day earlier. |
| New York Governor Andrew Cuomo announced that parts of major highways would be closed in preparation for the extreme weather, which could see the mercury plummet to -26C (-15F) overnight with wind chill. | |
| The polar blast was threatening crops and livestock across the American farm belt, even in the usually temperate Deep South. | The polar blast was threatening crops and livestock across the American farm belt, even in the usually temperate Deep South. |
| The sub-zero snap was expected to reach as far south as Texas and central Florida, the National Weather Service said. | The sub-zero snap was expected to reach as far south as Texas and central Florida, the National Weather Service said. |
| Tennessee and Kentucky were forecast to receive several inches of snow. | Tennessee and Kentucky were forecast to receive several inches of snow. |
| The weather has been blamed for at least 16 deaths in recent days, including: | The weather has been blamed for at least 16 deaths in recent days, including: |
| Meteorologists said some 187 million people in all would be able to feel the effects of the cold snap by Tuesday. | Meteorologists said some 187 million people in all would be able to feel the effects of the cold snap by Tuesday. |
| It has been widely blamed on a shift in the weather pattern known as the "polar vortex". | It has been widely blamed on a shift in the weather pattern known as the "polar vortex". |
| In Comertown, Montana, on Monday the temperature sank to -53C (-63F) with wind chill. | In Comertown, Montana, on Monday the temperature sank to -53C (-63F) with wind chill. |
| The state of Minnesota saw the mercury plummet to -48C (-56F) by the same measure. | The state of Minnesota saw the mercury plummet to -48C (-56F) by the same measure. |
| The South Pole, and Irkutsk, Siberia, by comparison, jointly basked in a relatively balmy -33C. | The South Pole, and Irkutsk, Siberia, by comparison, jointly basked in a relatively balmy -33C. |
| More than 4,500 US flights were cancelled just on Monday in the US because of the extreme weather. | More than 4,500 US flights were cancelled just on Monday in the US because of the extreme weather. |
| JetBlue Airways suspended nearly all operations at airports in Boston and around New York City until midday on Tuesday. | JetBlue Airways suspended nearly all operations at airports in Boston and around New York City until midday on Tuesday. |
| The state of Minnesota and the city of Chicago, Illinois, have ordered all schools closed. | The state of Minnesota and the city of Chicago, Illinois, have ordered all schools closed. |
| It was so cold that even the polar bear at Chicago's Lincoln Park Zoo was kept indoors, CNN reports. | It was so cold that even the polar bear at Chicago's Lincoln Park Zoo was kept indoors, CNN reports. |
| Public parks were also shut as officials warned that exposed flesh could become frostbitten. | Public parks were also shut as officials warned that exposed flesh could become frostbitten. |
| In Illinois, the National Guard used 10-tonne military vehicles to clear up after several lorries jackknifed, stranding nearly 400 vehicles. There were no fatalities or injuries reported in those incidents. | In Illinois, the National Guard used 10-tonne military vehicles to clear up after several lorries jackknifed, stranding nearly 400 vehicles. There were no fatalities or injuries reported in those incidents. |
| Freezing rain also caused hundreds of flight cancellations at airports in Toronto and Ottawa. | Freezing rain also caused hundreds of flight cancellations at airports in Toronto and Ottawa. |
| Nearly 1,000 homes in Newfoundland, Canada, were still without electricity on Monday after a power outage. | Nearly 1,000 homes in Newfoundland, Canada, were still without electricity on Monday after a power outage. |
| Environment Canada senior climatologist David Phillips told the Globe and Mail newspaper: "The weather gods are out to punish you." | Environment Canada senior climatologist David Phillips told the Globe and Mail newspaper: "The weather gods are out to punish you." |
| Some parts of Canada could see as much as 23in of snow over just a few days, he said. | Some parts of Canada could see as much as 23in of snow over just a few days, he said. |
| Send your pictures and videos to yourpics@bbc.co.uk or text them to 61124 (UK) or +44 7624 800 100 (International). If you have a large file you can upload here. | Send your pictures and videos to yourpics@bbc.co.uk or text them to 61124 (UK) or +44 7624 800 100 (International). If you have a large file you can upload here. |
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