Here is the latest on the winter storm wreaking havoc across the country

The latest:

• At least one weather warning in every province and territory.

• Hundreds of thousands without power in Ontario, Quebec.

• Hundreds of vehicles in collisions in southwestern Ontario, police say, including a 50- to 60-car pileup on Highway 402.

• Many flights cancelled at major airports, including Vancouver, Toronto and Montreal.

• Confederation Bridge between P.E.I. and N.B. closed.

• Worries about freezing rain, flooding in B.C.

• Same weather systems affecting U.S.

This holiday season in Canada, there's a veritable buffet of weather warnings on the menu.

Pick your poison: extreme cold, Arctic outflow, winter storm, snowfall warning, rainfall warning, wind warning, storm surge, blowing snow, blizzard and (deep breath) ice fog.

If you live anywhere in Canada, chances are you're under at least one of these warnings or advisories right now.

• Have a question or something to say? Email: ask@cbc.ca or join us live in the comments now.

The Environment Canada warning map has more red on it than the flag — all during one of the busiest travel times of the season.

Current Warnings across Canada

A big storm in Ontario and Quebec, a messy winter mix in British Columbia, extreme cold in parts of the West, and heavy rain and high winds in Atlantic Canada are affecting travel, causing power outages and leading to road accidents.

375,000 without power in Ontario, Quebec

Hydro One, Ontario's largest electricity utility, said crews had already responded to "significant" power outages Friday morning as high winds hit regions across the province. The utility's outage map showed roughly 70,000 customers without power as of 3:10 p.m. ET. Hydro-Québec's outage map shows 340,241 customers without power at 9 p.m. ET.

Police in southwestern Ontario are reporting collisions involving up to 100 vehicles, including a 50- to 60-car pileup on Highway 402. Highway sections — including Highway 401 from Tilbury to London — and rural roads are also closed in some areas.

The Ontario Provincial Police say roads are slick, slushy and littered with downed trees and power lines, with some areas experiencing low to zero visibility.

"If you do not need to travel today, please stay off the roadways," Const. Ed Sanchuk with the Norfolk County OPP said in a video posted to Twitter.

He said if you are out, turn on your lights and slow down. "We're seeing people driving right now like it's still summer-like conditions. They're sliding through stop signs. They're hitting curbs."

Sharon Hayes, founder of Helping Hamilton Homeless, said she is especially worried for all the people she knows living on the streets. She is expecting many to seek shelter in the GO Transit station or at a local bus terminal.

"It's scary when the storms come," she told CBC Hamilton on Friday morning. "I am petrified I am going to find someone frozen to death."

Cancelled flights

WestJet proactively cancelled flights at airports in Ontario, Quebec and British Columbia. Air Canada says it has cancelled "a number of flights" in Ottawa, Montreal and Toronto on Friday, including all of its flights out of Toronto's downtown island airport.

Wild weather grounds flights across the country

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In B.C., most of the South Coast, including Vancouver, is being warned of a messy mix. Bus services, ferry sailings and flights have all been affected.

Both the Port Mann and Alex Fraser bridges over the Fraser River in Metro Vancouver are closed due to ice on the bridge cables.

Environment Canada is forecasting freezing rain, with the agency warning of icy accumulations of between five and 25 millimetres. Vancouver International Airport says the freezing rain will arrive on top of as much as 14 centimetres of snow that fell overnight.

"Rarely do we see such heavy snowfall followed by freezing rain and heavy rainfall. We want everyone to remain safe,'' provincial Transportation Minister Rob Fleming said at a news conference on Thursday.

BC Hydro says more than 5,000 customers are without power across the province, with the largest outages concentrated across Vancouver Island and on the Lower Mainland.

Forecasters are eyeing the potential for flooding as temperatures nudge 10 C this weekend, and 50 to 80 millimetres of rain is expected to drench the region by Saturday night.

Things aren't quite as bad elsewhere in the country, but they aren't good:

• The weather continues to be frigid in parts of Yukon, Northwest Territories, northern B.C. and the Prairies, with temperatures in the –40s or –50s C, depending on the region.

• Heavy rains are expected in the Atlantic provinces, with some high winds, storm surge or freezing rain in certain regions. Environment Canada warns driving could be treacherous. Electrical utilities are warning residents to prepare for potential power outages, and airline departure boards at the Halifax
  airport were indicating delays and cancellations of some flights at 10:30 a.m. AT.

• The Marine Atlantic ferry Blue Puttees from Nova Scotia to Port Aux Basques, N.L., couldn't dock on Friday morning, partially due to rough seas, and had to go all the way back to North Sydney, N.S. Spokesperson Darrell Mercer said the 446 passengers won't be able to travel to Newfoundland until late Saturday night due to storm cancellations.

• The Confederation Bridge between New Brunswick and Prince Edward Island closed to all traffic at about 6 p.m., until "the current weather situation changes."

U.S. doing it bigger

The United States is being affected by the same deep freezes and winter storms as Canada, but there it's affecting more people.

More than 240 million people — about 60 per cent of the U.S. population — were under some form of winter weather advisory or warning on Friday.

WATCH | Widespread weather advisories in U.S.:

Power outages have left more than 1.4 million homes and businesses in the dark, according to the website PowerOutage, which tracks utility reports.

On the travel front, more than 4,600 flights within, into or out of the U.S. were cancelled on Friday, according to the tracking site FlightAware, causing more mayhem as travellers try to make it home for the holidays.

Additionally, the weather also forced some cross-border bridges between the U.S. and Canada to close, including the Peace Bridge that connects Buffalo, N.Y., and Fort Erie, Ont.

CBC storm coverage coast to coast: