Much of Central Ontario is under a Winter Storm Watch.
This covers Barrie and all of Simcoe County, York Region, Parry Sound-Muskoka, Dufferin County, and Grey-Bruce.
A system is moving up from the Southern U-S, threatening to dump up to 30cm of snow in the hardest hit areas.
Travelling conditions are expected to deteriorate quickly shortly after the snow arrives on Wednesday.
Brisk east to northeast winds will also result in local blowing and drifting snow, contributing to hazardous travelling conditions.
Environment Canada is closely monitoring this situation, and this winter storm watch may eventually be upgraded to warnings as this event draws closer.
Avoid travel if possible. Rapidly accumulating snow could make travel difficult over some locations. Visibility may be suddenly reduced at times in heavy snow. Surfaces such as highways, roads, walkways and parking lots may become icy and slippery. Poor weather conditions may contribute to transportation delays. Public Safety Canada encourages everyone to make an emergency plan and get an emergency kit with drinking water, food, medicine, a first-aid kit and a flashlight.