An intense winter storm that pushed into Ontario Wednesday has brought up to 30 cm of snow to some places.
The Weather Network's Storm Hunter Mark Robinson was in Windsor on Boxing Day, one of the first places to see the snow start to accumulate with the storm.
"Windy conditions resulted in a lot of blowing snow and people were out early shovelling their driveways and sidewalks," said Robinson.
The snow continued to push into the Greater Toronto Area throughout the night, reducing visibility and causing poor driving conditions across the region.
In the City of Toronto, 10 cm was reported by the early morning hours on Thursday. That's the biggest snowfall recorded for the area since March, 2011.
"That means it could be a tricky commute for those heading back to work after the Christmas holidays," says Gerald Cheng, a meteorologist at The Weather Network.
While city crews and snow plows worked through the night to clear roads, several accidents have been reported in and around the city due to the slick conditions.
Officials are warning drivers to avoid any unnecessary travel if possible.
"If you're not comfortable driving in the snow, don't drive in the snow," Staff Sergeant Chris Boddy of Toronto Police Services tweeted Wednesday evening.
The heavy snow has also resulted in several air travel delays or cancellations at Toronto's Pearson International Airport.
Travellers are urged to check the status of their flight before heading to the airport.
"The snow will taper across the GTA and southern Ontario Thursday morning, but heavy snow will continue over eastern Ontario," says Cheng.
Places like Kingston and Brockville have already seen between 25-30 cm of snow.
Those significant totals combined with gusty winds could reduce visibility to less than 800 metres throughout the day.
Winter storm warnings also cover much of Quebec with heavy snow and strong winds expected through Friday.
Visit the Alerts section of the website to keep on top of watches and warnings across the country.