An extended rainfall across the Greater Toronto Area is turning into a nasty winter storm making for icy conditions on the road and strong snowy winds in the sky.

A winter storm warning is in effect for the city as Toronto Mayor John Tory warns it could take days to clear the up to 15 centimetres of snow left in its wake.

Here’s a recap of how the weather system has been passing through the region and the problems it has caused for commuters and travellers so far.

7:30 P.M. - Environment Canada’s David Phillips told CP24 that the snow is expected to keep falling overnight.

“We’re going to see a continuation of what we would call, you know, periods of light snow, but blowing snow. We’re seeing that existing across most of the province in southern and eastern Ontario,” Phillips said, adding it will likely carry on for roughly 17 hours until around 11 a.m. Saturday.

“It will blow that snow and produce restricted visibility. Windchill will be down to the mid-20s,” he said. “This storm was well-advertised, and it actually delivered on what it promised to be – and it’s a miserable one.”

4:30 P.M. - The Niagara Falls Bridge Commission said all Niagara bridges are closed U.S. bound due to storm-related travel bans in the U.S. until further notice.

"Our incredible staff have been working around the clock to maintain our three international bridges (Rainbow Bridge, Whirlpool Bridge and Lewiston – Queenston Bridge) and plazas, however travel bans for Niagara County, New York and Commercial driving bans as well as Department Of Transportation and Thruway closures have closed off all egress from our bridges US bound due to the hazardous conditions," Chief Executive Officer Kenneth N. Bieger said in a statement Friday.

"We continue to work with our partners to allow all essential personnel and emergency vehicles to cross and will continue to do our best to ensure the safety of our staff and patrons throughout the night and into tomorrow as we continue to battle the storm and extremely high winds," he added.

Niagara Falls Mayor Jim Diodati said it was the right call to close the bridges to the U.S. given the significant weather conditions south of the border.

"It was a good decision given the fact that the Buffalo airport is closed, there's a driving ban in Erie County. We've got a lot of challenges along Lake Erie," he told CP24 Friday.

"And now that the bridges are closed we've got some issues on Highway three and on the QEW is returning traffic back. So you can still come into Canada from the U.S. but you cannot enter the U.S.," he added. 

Meanwhile, in Toronto Billy Bishop Airport said all remaining Porter Airlines flights have been cancelled for Friday.

4:00 P.M. - Toronto Pearson International Airport said 38.49 per cent of Friday's departures have been cancelled and 39.5 per cent of arrivals have been cancelled.

"The cancellations right now, what we're seeing, a large majority of that is related to the WestJet operation that they've halted for today. So that has had a huge impact. If you took that out of the equation, we are still seeing some impacts. Some of it is because of what's happening here but we're also really seeing the majority of it because of impacts elsewhere. So the storm system that's made its way here today was in the U.S. yesterday and still is today causing some big impacts and everything's really connected," Greater Toronto Airports Authority Spokesperson Tori Gass told CP24.

The City of Toronto cancelled ferry service for the rest of Friday. However, bus service will run every two hours from Billy Bishop Airport to Wards Island.

2:45 P.M. - Canada Post issued red and yellow delivery service alerts for every province and territory in response to the storm.

"We will do our best to process and delivery today, but it may not be possible in some regions and may be delayed in others. Although recovery efforts are underway to get some delivery on December 24 where warranted, these efforts will be pending weather and road conditions as we prioritize the safety of our employees," the mail carrier said in a news release Friday afternoon. 

Regular delivery operations will resume on Dec. 28.

2:30 P.M - The OPP said no serious injuries have been associated with any of the multi-vehicle collisions along the 401/402 corridor. Two people were transported to the hospital with non-life-threatening injuries.

The City of Mississauga said priority route salting is ongoing while secondary routes, bus stops, and priority sidewalk routes have been completed at least once, with some re-runs on some routes.

2:00 P.M. - All Toronto Public Health vaccination clinics closed. The clinics have been cancelled for Saturday, Dec. 24. Toronto Public Health vaccination clinics will be closed for the holidays starting Dec. 25 and re-open on Dec 28.

All York Region Public Health vaccination clinics and waste depot locations were also closed at 2 p.m.

The City of Vaughan announced that all city facilities are closing early today in response to the storm. All Vaughan Public Libraries closed at 1 p.m. City Hall, the Joint Operations Centre and all community centres closed at 2 p.m.

1:00 P.M. - The City of Toronto said recreation centres, arenas, and conservatories are closed today. However, the Warming Centre at Mitchel Field will remain open and the Agincourt, John Innes and Regent Park Community Centre will remain open for respite.

12:30 P.M. - CAA South Central Ontario said they've seen at least 2,260 calls for service Friday. The wait time in the region averaged 40 minutes.

12:00 P.M. - Ontario Provincial Police Sgt. Kerry Schmidt said that there are reports of more than 100 vehicles involved in multiple collisions along Highway 401 between Tilbury and Colonel Talbot Road west of London. He said that there are not yet any reports of serious injuries but that “officers are still trying to get to all of the involved vehicles.” All westbound lanes on Hwy. 401 are currently closed near London due to the collisions. Schmidt said that Highway 402 has also been fully closed in its "entirety" due to poor road conditions.

“It is just a big mess out there right now,” Schmidt told CP24. “I don’t have reports of any serious injuries but as officers are responding to crashes more crashes are happening behind them as vehicles plow into stopped traffic.”

11:30 A.M. – CP24 Meteorologist Bill Coulter said that temperature that began the day in the positives are continuing to plunge, creating flash-freeze conditions in parts of the GTA. He said that while the storm will not be a “mega snow event” in Toronto, it will still create significant challenges due to the potential for blowing snow and sub-zero conditions. Drivers, he said, should stay off the roads until at least mid-day Saturday if they can.

“When I came in this morning it was 4 C, then it was 1 C, then it was -3 C and now it is – 6 C. If you give it a few hours we will be at – 9 C, feeling like the minus high teens. The wind gusts will also continue to accelerate with gusts of 90 and maybe even 100 kilometres an hour. This is a potent storm system, we are just not in the sweet spot for snow," Coulter said. 

10:45 A.M. - Porter Airlines said “many” Ontario-based flights will likely be cancelled this afternoon due to the weather.

“We are planning to ensure we are in a strong position to operate tomorrow and get as many passengers to their destinations as possible,” the downtown Toronto-based airport said in a tweet.

Porter said complimentary moves are available for any flight scheduled today or tomorrow and can be made on their website.

10:30 A.M. - The GTAA said just over 30 per cent of all flights flying in and out of Toronto have been cancelled.

10:00 A. M. – Blizzard warnings have been issued for a swath of southern Ontario, where Environment Canada says that “crippling” conditions are possible. It says that 25 to 50 centimetres of snow could fall in the following communities. 

  • Niagara Falls, Welland, southern Niagara Region, Dufferin
  • Midland, Orillia
  • Orangeville, Dufferin County

9:00 A.M. – Temperatures started to drop and the cold air quickly turned the lingering rain into snowfall in parts of the GTA.

CP24 Meteorologist Bill Coulter said those colder temperatures could make way for flash freezing conditions on major roadways.

“While it won’t be the most snow we’ve ever seen -- five to 10 cm -- it’s enough to create near zero visibility, whiteout conditions especially through the afternoon and evening,” he said.

8:00 A..M. – Mayor John Tory held a news conference Friday to address the snow clearing efforts in the city.

He said that because of the overnight rain, crews were unable to treat roads with the salt normally laid before a winter storm such as this.

7:00 A.M. – Travellers at Pearson are being encouraged to check their flight status and follow the advice from their respective airlines before making the trip to the airport.

In a statement released Friday morning, the Greater Toronto Airports Authority (GTAA) said airlines “remain affected” by the weather over western Canada.

WestJet proactively cancelled all its flights at airports in or out of Ontario, as well as British Columbia, and Quebec on Thursday ahead of stormy weather.

Meanwhile, Air Canada has initiated a new “goodwill policy” that let’s customers cancel flights online to receive a full refund or voucher on tickets purchased on or before Dec. 21 for any flight between Dec. 22 and 26.

“Customers should utilize the online tools to obtain their refund, travel voucher, or to rebook. Please only go to the airport if you have a confirmed flight and the flight status shows it is operating,” the airline said in a tweet published Thursday night.