On Sunday afternoon, Environment Canada issued a winter storm warning for the city. That came after the city's medical officer of health issued an extreme cold weather alert.
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.
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.