More than 200 collisions were reported to Toronto Police by 4 p.m. Thursday, extending a messy morning commute into a day of dangerous driving across much of southern Ontario.

A nor’easter that swept across the Maritimes dumped snow in eastern Ontario before heading west across the central and southern regions, giving residents their first taste of wintry weather this season.

A snowfall warning was in effect for Toronto and several surrounding municipalities Thursday morning, as Environment Canada warned that the regions could receive upwards of 20 centimetres of snow.

The snowy conditions made for a slow and treacherous commute in the GTA. CAA South Central Ontario reported a busy start to the day, with approximately 575 calls for service by 8 a.m.

Toronto Police Cst. Clint Stibbe said the messy roads were already causing disputes between snow plow drivers and commuters.

“Tempers are starting to flare, and the weather isn’t even that bad yet,” Stibbe said.

School districts in parts of the Toronto area cancelled buses and Pearson International Airport reported some flight delays and cancellations. Passengers are being asked to check their flight status before heading to the airport.

The storm system is expected to taper off in time for the afternoon commute.

Other parts of Canada were also experiencing wild weather Thursday, as the nor’easter storm impacting southern Ontario slowly moved its way out of eastern Canada.

In the Atlantic provinces, snow in northern New Brunswick was causing power outages, and road and school closures. Bathurst, N.B., was hit with 60 centimetres of snow, followed by heavy rain. Parts of Newfoundland, meanwhile, were hit with high-speed wind gusts.

Heavy precipitation has also flooded roads and bridges in the Maritimes, with parts of central and western Nova Scotia receiving more than 100 milllimetres of rain. The rainfall also caused bridge and road washouts in western P.E.I.

Meteorologist Peter Kimbell said Thursday temperatures were into the double-digits in Nova Scotia as the system moved out.

“It’s actually very lovely in Nova Scotia today, very balmy,” Kimbell told CTV’s News Channel.

While much of eastern Canada digs out, parts of B.C. are also dealing with extreme weather.

Delta declared a state of emergency Wednesday, after a storm surge hit at the same time as the king tide.

No one was injured, but waves breached a dike. Officials put up a temporary seawall, which has held out.

Though the state of emergency has been lifted, Delta Mayor Lois Jackson said they’re not completely out of the woods.

“We’re still with a very high tide but the velocity of the wind has abated,” Jackson told News Channel