Most of southern Ontario is under a special weather statement ahead of what Environment Canada is calling "significant snowfall" mid-week.
A low pressure system will be bringing snow to Toronto and the GTA Wednesday night and into Thursday with snow accumulations of 10 to 20 centimetres possible.
"Wednesday into Thursday, we have a massive storm system heading into the Great Lakes, a lot of moisture will accumulate in this low pressure area," said Denise Andreacchi, CityNews 680 weather specialist. "Single day snowfall totals will be higher than they have been for many communities so far this winter."
Environment Canada says the rapidly accumulating snow will make travel difficult with reduced visibility in heavy snow.
"Weather-wise, we will definitely be affected by travel Wednesday night," Andreacchi added. "It starts during the early part of the day, but really continues into the late afternoon and evening and will last through the night into Thursday morning."
"Winds will be strong on Wednesday, with gusts up to 30 mph, so there will be a risk of coming and selling snow."
Similar warnings are also in effect for the Halton, Niagara and Durham regions.
Andreacchi says the GTA can expect another round of frenzied activity Friday into Saturday.