Toronto will be dispatching hundreds of snowplows and salt trucks on a sub-zero Sunday evening, as a snow storm that is tracking across southwestern Ontario is expected to create some ugly driving conditions for Super Bowl revellers.

On Sunday afternoon, Environment Canada issued a winter storm warning for the city, along with warnings for much of southwestern Ontario. That came after the Toronto's medical officer of health issued an extreme cold weather alert earlier in the day.

As of 2 a.m. ET, the temperature stood at -14 C at Pearson airport, but the windchill made it feel like -24.

The warning from Environment Canada indicates the storm should hit the Greater Toronto Area by the early evening. The snow will keep falling into Monday morning.

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The combination of winds and snow made for some ugly driving conditions. The Ontario Provincial Police said that blowing snow had already hit the west end of the GTA by mid-afternoon.

Environment Canada suggested motorists "consider postponing" non-essential travel because of the weather. This comes as many people may be intending to head out to take part in Super Bowl festivities tonight.

A small number of arriving flights were cancelled at Toronto's island airport on Sunday afternoon. About a dozen departing flights were listed as cancelled on the PortsToronto website.

At Toronto Pearson International Airport, normal winter operations were still underway as of the supper-hour. Its website, however, listed dozens of arriving flights as delayed and nearly 20 were listed as cancelled.

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'Really a winter wallop'

Earlier in the day, David Phillips of Environment Canada said the clipper storm moving through Ontario on Sunday is carrying moisture with it from Colorado.

"It's a Super Bowl storm and really a winter wallop," he told CBC News in a telephone interview.

"We could see in parts of Ontario today more snow than they've had all winter in terms of a storm."

For example, Phillips said that the city of London could see 25 to 30 centimetres when all is said and done.

"The closer you are to Lake Erie, Lake Ontario, it will be worse — so areas north of Toronto, for example, won't see as much snow as they would see in parts of southwestern Ontario," Phillips said, noting that Hamilton, Niagara, London and Windsor are under winter storm warnings.

It was initially believed that Toronto was likely to see between five and 10 centimetres piling up by Monday morning. But Phillips said it will all depend on where the storm goes. By late Sunday afternoon, Environment Canada was reporting that Toronto could see closer to 10 to 15 centimetres.

Phillips also said that this is unlikely to be the end of what Mother Nature has in store this winter.

"We know that winter is sometimes slow to leave us and even though we think spring is around the corner, it may be well over the horizon," he said.