‘Polar vortex’ in North America brings record temperatures

A winter storm which has hit North America has already blanketed areas of Canada and the north-eastern US with up to 2ft (60 cm) of snow.

It has been blamed for 16 deaths in recent days and the cancellation of more than 3,700 flights this weekend.

"The coldest weather in years will be making its presence known from the Upper Midwest to the Mid-Atlantic region for the beginning of the work week," the US National Weather Service said.

The weather service said "an incredibly strong surge of bitterly cold Arctic air" was sweeping across the country until Tuesday.

It is set to continue to the north-east, where residents are still digging out from the week's deadly snowstorm.

It could bring some of the coldest temperatures in two decades.

"The last really big Arctic outbreak was 1994," Reuters news agency quoted Bob Oravec, a forecaster with the National Weather Service, as saying.

"Outbreaks like this don't occur every day."

Schools in Chicago are among those closing as officials tell people to stay indoors on Monday.

Meanwhile, a plane from Toronto slid into snow as it turned onto a taxiway after landing at New York's JFK airport on Sunday.

No-one was hurt in the incident but all flights at the airport were suspended for two hours because of icy runways.

The plunging temperatures result from the polar vortex, an anti-clockwise pool of cold, dense air.

Forecasters say temperatures in the north and central US could feel as low as -60F (-51C) with the effect of wind chill.

Authorities have warned residents to remain indoors, both for their own safety and to keep roads clear for snow removal.

In Canada, thousands of people on the island of Newfoundland remain without power due to a transformer fire linked to heavy snow. The temperature dropped as low as -20F (-29C) in Toronto and -36F (-38C) in Quebec City with wind chill on Thursday - the lowest seen in at least two decades there.

Heavy snow has also affected US states including New York, Connecticut and Massachusetts. Boston was said to be the worst hit with nearly 18in (45cm) of snow.