A low-pressure system that is massing in Texas on Monday will push into the Great Lakes on Tuesday, said CBC meteorologist Johanna Wagstaffe. That system will bring periods of light snow to southwestern Ontario starting Tuesday, she said.
The snow will become heavy Wednesday from 3 a.m. to 9 a.m., said Wagstaffe.
Winds will produce blowing snow and reduced visibility.
Environment Canada said in a special weather statement that 20 to 30 centimetres of snow could accumulate in areas stretching from Windsor in the west to Brockville in the east by Wednesday afternoon, after which the storm is expected to taper off.
"It's possible it could be the most snow we've seen in a storm so far this year, at least for regions outside the snowbelt," said Environment Canada meteorologist Ria Alsen.
The Canadian Automobile Association advises motorists to avoid the roads or give themselves extra travel time on Wednesday. It also suggests they carry a fully charged cellphone, winter survival kit, extra clothing, blankets, non-perishable food and candle, in case they get stranded.
The storm is expected to follow a deep freeze in much of southern Ontario on Monday.
The City of Toronto has declared an extreme cold alert as temperatures dipped to -18 C Monday morning. The city has lined up extra support services to help get homeless people off the streets.
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