Southern and eastern Ontario are being hit with a mix of snow and rain, creating a sloppy mess throughout the region for Wednesday's morning commute.

A snowfall warning for Toronto was lifted on Wednesday morning but remains in place for areas to the outside of the city, including Halton-Peel, York-Durham and Dufferin-Innisfil, Environment Canada said.

"We had a real mixture of wet snow [and] rain between 10 p.m. and about midnight," said Environment Canada meteorologist Geoff Coulson on Wednesday.

"The snowfall warning has been ended for the city itself but it does remain in place for areas to the north. In terms of total accumulations, there's about four to five centimetres in the downtown core, higher amounts outside toward Pearson airport," he said.

"There may only be about 10 centimetres on the ground in some areas but it's very heavy stuff."

Meanwhile, up to 15 centimetres of snow are expected in several eastern and central Ontario cities — including Ottawa, Belleville, Kingston, Peterborough and Haliburton — by Thursday morning, Environment Canada said.

Windsor had 11 centimetres of snow by Wednesday morning, and about 20 centimetres was possible for Ottawa as the storm moves east.

CBC reporter Linda Ward reported messy conditions on downtown Toronto streets.

"It's a slushy mess for pedestrians and motorists on roads and sidewalks," she said. "For most areas in the downtown core, the snow has turned to rain and that's creating flooding."

With the slush clogging some street drains, flooding was reported on the Queensway, the Bayview-Bloor ramp and the Jameson Avenue ramp onto the westbound Gardiner Expressway.

The wet snow made a mess of roads but a CBC viewer sent this picturesque image to CBC Toronto via Twitter. The wet snow made a mess of roads but a CBC viewer sent this picturesque image to CBC Toronto via Twitter. (Submitted)

There were also reports of trees toppled by the heavy snow.

About 3,500 homes in the GTA were without power. There were more outages reported north of the city.

Despite the wet conditions, police were not reporting a major increase in collisions on the highways. OPP Sgt. Dave Woodford said people seem to be listening to the advice of police and are slowing down.

"I was out at 4:30 this morning and there was a lot more traffic than you'd normally see, so people were getting out early and taking their time getting where they're going," said Woodword. He said there were some collisions but "nowhere near the numbers that we saw in the last heavy snowfall a couple of weeks ago."

Woodford said drivers need to remain vigilant and slow down, especially when traffic becomes lighter later in the morning.

The southern Ontario branch of CAA said on Twitter it had already received 1,000 calls for service by about 9 a.m.

Flight cancellations, travel alerts

The weather led to the cancellation of dozens of flights at Toronto's Pearson International Airport.

The departure board was showing at least 106 cancelled flights through the late morning and at least 80 cancelled arrivals. Most of the affected flights are to and from U.S. destinations coping with heavy, wet snow that has clogged roads and airports and been blamed for at least three deaths.

Porter Airlines issued a travel advisory for flights out of the Toronto island Billy Bishop Airport, Chicago and Windsor.

Both airlines are recommending travellers check their flight status before heading to the airport.

The weather also snarled public transit, with systems in both Toronto and Hamilton reporting delays on Wednesday morning.

With files from The Canadian Press