UPDATE: An extreme weather warning continues in the Toronto area and overnight, Toronto Hydro had restored power to 230,000 homes, leaving 70,000 still without power Christmas morning.

TORONTO -- As tens of thousands in communities from Ontario to the Maritimes faced the possibility of a Christmas without power, officials issued an urgent warning for residents to guard against carbon monoxide poisoning in their attempts to stay warm.

The call came as temperatures dropped along the path of a nasty storm which had downed power lines, left trees and roads covered in ice and caused widespread travel delays since the weekend.

"It's really cold, so that's why the concern arises,'' Environment Canada meteorologist Marie-Eve Giguere said of the warning that was being sounded Tuesday in communities where some were in their third full day without power.

Much of southern Ontario and southern Quebec experienced temperatures between -15 and -20, with the mercury expected to drop further through the night. Parts of the Maritimes that had been hit by the ice storm on Monday weren't quite as cold, but still experienced temperatures below zero

"It usually happens behind a strong system, you get very cold air in behind,'' said Giguere.

Warmth-craving residents were being urged to take advantage of warming centres or the hospitality of friends and family rather than using gas-powered generators, charcoal stoves or even barbecues indoors, scenarios which led to a number of people being rushed to hospital.

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  • Looks pretty! I mean the Logo on truck!!! lol

    <a href="http://www.huffingtonpost.com/social/nmedeiros"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/nmedeiros">nmedeiros</a>:<br />

  • All signs point to ice

    <a href="http://www.huffingtonpost.com/social/onthewing"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/591020830/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/onthewing">onthewing</a>:<br />Road sign fringed with ice in Brampton during the ice storm that hit southern Ontario Dec 22 2013

  • B&W ice branches

    <a href="http://www.huffingtonpost.com/social/IamSteele"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/740788092/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/IamSteele">IamSteele</a>:<br />Closeup on the first night. B&W in the Leeside neighborhood of Toronto.

  • Iced Line

    <a href="http://www.huffingtonpost.com/social/onthewing"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/591020830/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/onthewing">onthewing</a>:<br />Electrical line drooping across a neighbors driveway in Brampton during the Dec 22 2013 ice storm that hit southern Ont.

  • Apple tree branch

    Toothpick size branch

  • ice Storm

    <a href="http://www.huffingtonpost.com/social/Ron_Linda"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/616822574/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Ron_Linda">Ron Linda</a>:<br />The big one in Quispamsis, N.B.

  • Eastborne Park

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />

  • Standing Strong

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />Maple Leaf in ice

  • Iced Cherry

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />Frozen Cherries

  • Eastbourne Park, Brampton, ON

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />Not a tree spared!

  • Frozen In Time, Brampton, ON

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />

  • Eastbourne Park, Brampton, ON

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />Nite Shot

  • Ice Flowers ~ Brampton, ON

    <a href="http://www.huffingtonpost.com/social/Derek_J_Sowa"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/803865400/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Derek_J_Sowa">Derek J Sowa</a>:<br />

  • Crews clear branches snagged on power lines on a closed road in Brampton, Ont., Monday, December 23, 2013. Hydro companies in the Greater Toronto Area — which appeared to be the hardest hit by the weather system — warned some residents to brace for the possibility of being without power until Boxing Day or later.

  • An arborist cuts a tree branch dangling from a power line in Brampton, Ont., Monday, December 23, 2013. Hydro companies in the Greater Toronto Area — which appeared to be the hardest hit by the weather system — warned some residents to brace for the possibility of being without power until Boxing Day or later.

  • A pedestrian walks down a street still closed due to downed power lines and trees in Brampton, Ont., Monday, December 23, 2013. Hydro companies in the Greater Toronto Area — which appeared to be the hardest hit by the weather system — warned some residents to brace for the possibility of being without power until Boxing Day or later.

  • Peel Region employee Dwayne Berrigan cuts fallen limbs from iced trees in Brampton,Ont., Monday, December 23, 2013. Hydro companies in the Greater Toronto Area, which appeared to be the hardest hit by the weather system, warned some residents to brace for the possibility of being without power until Boxing Day or later.

  • Travelers line up after dozens of flights were canceled or delayed by Sunday's ice storm at Pearson International Airport in Toronto, Monday, Dec. 23, 2013.

  • Passengers sleep on the floor in the check-in line as dozens of flights were canceled or delayed by Sunday's ice storm, at Pearson International Airport in Toronto, Monday, Dec. 23, 2013.

  • Got Game

    <a href="http://www.huffingtonpost.com/social/Phil_Vriend"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/1568910464/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Phil_Vriend">Phil Vriend</a>:<br />The dolls on display at my neighbour's house also took a hit in the ice storm.

  • Workers from Stacey Electric, a Toronto Hydro subcontractor, work to repair downed power lines around Victoria Park and Denton Avenues in Scarborough on Dec. 23 after a severe ice storm hit Toronto.

  • A vehicle damaged by fallen tree branches is shown in the High Park area of Toronto on Dec. 23. A steady dose of freezing rain across parts of Eastern Canada turned roads and sidewalks into skating rinks Sunday, cut power to hundreds of thousands of people, and played havoc with holiday plans at one of the busiest travel times of the year.

  • Fallen tree limbs are stacked up in the Urban Forestry Yard in Toronto on Dec.23. A steady dose of freezing rain across parts of Eastern Canada turned roads and sidewalks into skating rinks Sunday, cut power to hundreds of thousands of people, and played havoc with holiday plans at one of the busiest travel times of the year.

  • It was his time. We all have to go some time.

    <a href="http://www.huffingtonpost.com/social/Darryl_Nielsen"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/Darryl_Nielsen">Darryl Nielsen</a>:<br />It was his time. We all have to go some time.

  • The icy hedge

    <a href="http://www.huffingtonpost.com/social/sunil_T"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/100001296030346/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/sunil_T">sunil T</a>:<br />An icy hedge in our neighborhood in Don Mills this morning.

  • A pedestrian walks under a tree blocking Wellesley Street East following an ice storm in Toronto on Monday, Dec. 23, 2013.

  • Power lines dangle on Sackville Street following an ice storm in Toronto on Monday, Dec. 23, 2013.

  • A man pushes a stroller through an ice-covered street in Toronto, Sunday, Dec. 22, 2013, after a storm passed through the area.

  • Ice coats tree branches as a man walks on the sidewalk in Toronto , Sunday, Dec. 22, 2013, after an ice storm passed through the area.

  • People clear the sidewalks on a closed off street in Toronto after an ice storm knocked down trees and power lines in much of the city on Sunday, Dec. 22, 2013.

  • John Szücs scrapes ice off his car near Dufferin Grove Park in Toronto on Sunday, Dec. 22, 2013, following ice storm.

  • Icicles hang from a downed power line on a residential street in Toronto as over 250,000 people face up to 72 hours without electricity after a storm brought heavy ice rain, on Sunday, December 22, 2013.

  • A man steps over downed power line near Dufferin Grove Park in Toronto on Sunday, Dec. 22, 2013 following an ice storm.

  • Our tree in Brampton

    <a href="http://www.huffingtonpost.com/social/IdentityPollution"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/100003975728308/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/IdentityPollution">IdentityPollution</a>:<br />The ice storm tore our tree right in half.

  • Brampton

    <a href="http://www.huffingtonpost.com/social/IdentityPollution"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/100003975728308/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/IdentityPollution">IdentityPollution</a>:<br />Our street got hit hard

  • Kitchener

    <a href="http://www.huffingtonpost.com/social/iiabbieii"><img style="float:left;padding-right:6px !important;" src="http://s.huffpost.com/images/profile/user_placeholder.gif" /></a><a href="http://www.huffingtonpost.com/social/iiabbieii">iiabbieii</a>:<br />Our tree sure took a beating

  • @scubafantoo

    @scubafantoo: <a href="https://twitter.com/scubafantoo/status/414775553385050112" target="_blank">#ONSTORM @StormhunterTWN @StormhunterTWN @vaughanweather @JdeQuebec Brampton, Ont! pic.twitter.com/XTHTnPjh1Z</a>

  • Lending A Helping Hand

    <a href="http://www.huffingtonpost.com/social/fitcheerldr"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/775930130/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/fitcheerldr">fitcheerldr</a>:<br />The neighbourhood coming together to help clean up after the ice storm of 2013.

  • @LoveRadollCats

    @LoveRadollCats: <a href="https://twitter.com/LoveRadollCats/status/414808493439188992/photo/1" target="_blank">#icestorm2013 Kitchener Ontario pic.twitter.com/nAxYS8VEJ9</a>

  • @ar09

    @ar09: <a href="https://twitter.com/ar09/status/414803999263428609/photo/1" target="_blank">tree down in #icestorm2013 #darkTO #680storm #icestorm24 pic.twitter.com/zWV4wFRB9e</a>

  • ‏@elanacamille

  • ‏@fitcheerldr

    ‏@fitcheerldr: <a href="https://twitter.com/fitcheerldr/status/414795586630467585/photo/1" target="_blank">Here's a pic of our neighbourhood working together to clear the downed trees. pic.twitter.com/63qWGAVyTB</a>

  • @diego153

  • @MattBellissimo

    @MattBellissimo: <a href="https://twitter.com/MattBellissimo/status/414784624125308929/photo/1" target="_blank">Normally I'd blame lightning for something like this... pic.twitter.com/P3wX5lVUe2</a>

  • @randy_mcneil

  • Don Mills

  • Don Mills

  • Don Mills

  • @canuck10001

  • @cylonchloe

  • @cylonchloe

At least two people died of carbon monoxide poisoning in the town of Newcastle, Ont., east of Toronto, after trying to keep warm with a gas generator running in a garage.

Carbon monoxide poisoning was also believed to be the cause of three deaths in a chalet on Quebec's north shore, although it was unclear if the incident involved a loss of power related to the ice storm.

In the hard-hit Toronto area,where some 90,000 customers remained without power, authorities reported a dramatic jump in calls for suspected carbon monoxide poisoning, responding to 110 calls in a 24 hour period. Officials said they typically see 20 such calls a day.

"We're looking at approximately six times as many calls,'' Toronto Mayor Rob Ford said as the city issued an extreme cold weather alert.

"I understand they want to keep warm but you cannot do this. This is deadly.''

Fire officials warned residents not to use any appliance that burns inside a home, and even cautioned against using a lot of candles.

"People are using these in the house, I've never seen anything like it, I don't understand it,'' Toronto Deputy Fire Chief Mike McCoy said of residents using charcoal brickettes or other outdoor heat sources inside.

"If the home stays closed and there's no way to bring in fresh air, oxygen, you're going to run into a CO issue.''

Adding to the risk was the fact that people often don't know they are being affected by the deadly colourless, odourless gas.

"It's known as the silent killer, that's the real danger,'' said McCoy. "People don't feel this coming on. They aren't aware of it, typically they may go to bed leaving something burning for the heat and worst-case scenario, you never wake up from it.''

Ontario's premier added her voice to the cautionary calls, reminding residents that electric carbon monoxide detectors would not work in a power outage unless they had battery backups.

"It's vital that everyone heed the warnings of emergency officials,'' said Kathleen Wynne.

Meanwhile, crews continued to work around the clock to restore power to those who were still without hydro in parts of southern Ontario, Quebec, New Brunswick and Nova Scotia.

Officials warned, however, that while crews were doing their best, there would be some who would likely have no power through Christmas and even Boxing day.

Dianne Worrell expected to be among them and was making alternate arrangements for the holiday meal she planned to host.

"It's like a war zone,'' she said of her Markham, Ont., neighbourhood where a downed power line was still strewn across a neighbour's yard.

"There's lots of broken trees, the neighbours were trapped in their driveway for a couple of days because a tree had fallen across.''

Power Stream, the utility which serves Markham, Richmond Hill and Vaughan among other communities, reported 13,100 customers were still down Tuesday.

In Toronto, where 300,000 lost power at the height of the storm, crews from Ottawa, Windsor, Manitoba and Michigan were helping local teams with their efforts.

Hydro One, which serves 1.3 million customers in Ontario communities that include Guelph, Peterborough and Walkerton, had 39,000 customers still without power.

Hydro Quebec said some 31,700 customers were without electricity on Tuesday morning.

In New Brunswick, more than 40,000 customers were still in the dark, almost half of them in the Saint John area. NB Power said it was aware of the frustration the outage was causing but warned that some would have to wait until Saturday before hydro is restored.

Crews made progress in Nova Scotia, where the number of outages had been cut to less than 2,000 by late Tuesday.

Airlines which had to make widespread cancellations during the ice storm were returning to regular service Tuesday with only a few weather-related delays expected.

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Toronto Mayor Rob Ford says one Hamilton worker was injured due to falling ice last night.

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Toronto Mayor Rob Ford urges caution as warmer weather can cause ice to fall.

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As of the afternoon of Christmas Day, tens of thousands from Ontario to the Maritimes are still without power. According to the Canadian Press:

- 13,500 customers without power in Quebec, primarily in the Eastern Townships

- 30,000 customers in the dark in N.B., with nearly half in Saint John area

- Power back on for affected customers in N.S.

- 2,500 customers without power in Pickering and Ajax east of Toronto

- 6,700 customers without power in Markham, Richmond Hill and Vaughan

- 24,000 customers without power in Guelph, Peterborough and Walkerton

- 72,000 customers without power in Toronto

For the latest updates on the power outages, we'll be posting more on the story at huffingtonpost.ca or follow us on Twitter.

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Many calls related to carbon monoxide. Chief Jim Sales reminds people not to use outdoor generators, stoves, barbecues indoors. Very dangerous and a CO risk.

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Head of TCH says hundreds of meals being handed out to residents without power.

Premier Wynne also to make visit to TCH facilities later this afternoon, according to official itinerary.

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Mayor Rob Ford said that garbage crews will begin pick-up of tree debris on Dec. 27. Could take 4-6 weeks to pick up large volume of waste.

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Officials updating at 11 am press conference:

Mayor Rob Ford, Toronto Hydro say about 72,000 customers now without power. Majority of outages on the east side of the city.

Toronto Hydro CEO Anthony Haines urging patience. Says call centre is receiving 128,000 calls, average day about 3000 calls.

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Temperatures in the City of Toronto have risen. The high on Christmas day is expected to be -4. The city says that warming centres are still open.

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City of Toronto 9:35 PM EST Tuesday 24 December 2013

Special weather statement for City of Toronto continued

Very cold temperatures moderating later Christmas Day. Winds to 20 km/h at times.

Cold temperatures are occurring over the areas most significantly affected by the weekend ice storm. As of 9:00 PM Christmas Eve, temperatures averaged near minus 15, except minus 19 in the St Lawrence Valley.

A very cold night is in store. Low temperatures Christmas morning are expected to range from minus 17 in the City of Toronto to minus 23 in some rural areas and in the St Lawrence Valley.

Temperatures will slowly moderate Christmas Day with temperatures reaching minus 6 to minus 8 late Christmas afternoon. Temperatures will further moderate to values near minus 3 by Boxing Day.

Winds are generally light to northwesterly at 15 km/h this evening, becoming light tonight, then southeast 20 km Christmas Day. On Boxing Day winds of 20 to 25 km/h from southwest are forecast.

Periods of snow will develop over most regions Christmas Day then end by Boxing Day. However amounts of 5 cm or less are expected.

The moderate winds at times could cause more branches to fall. To those who are still without power it is advised to seek warm shelter and prepare for the colder than average temperatures that are expected.

Given the well below freezing temperatures, much of the ice will not melt and will likely remain on many surfaces through Christmas and Boxing Day until the end of the week.

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Pets welcome. Vulnerable residents will be able to access food, water, and heat.

Toronto Community Centre locations are as follows:

  • Dennis R. Timbrell Community Centre, 29 St. Denis Dr. (Eglinton/Don Mills)
  • Malvern Community Centre, 30 Sewells Rd. (Neilson/Finch)
  • Agincourt Community Centre, 31 Glen Watford Rd. (Sheppard/Midland)
  • Driftwood Community Centre, 4401 Jane St. (between Finch and Steeles)
  • Mitchell Field Community Centre, 89 Church Ave. (Yonge/Finch)
  • Joseph P. Piccininni Community Centre, 1369 St Clair Ave. W. (St Clair/Keele)
  • Matty Eckler Community Centre, 953 Gerrard St. E. (Pape/Gerrard)
  • Lawrence Heights Middle School, 50 Highland Hill (between Ranee and Dane)
  • Edithvale Community Centre, 131 Finch Ave. W. (between Bathurst and Yonge)
  • Pleasantview Community Centre, 545 Van Horne Ave. (between Edmonton and Brian)
  • East York Collegiate Institute, 650 Cosburn Ave. (Coswell/Coxwell)
  • McGregor Park Community Centre, 2231 Lawrence Ave. E. (Lawrence/Kennedy)

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  • Division 11 – 2054 Davenport Road (Davenport/Osler)
  • Division 12 – 200 Trethewey Drive (Trethewey/Black Creek)
  • Division 14 – 350 Dovercourt Road (College/Dovercourt)
  • Division 22 – 3699 Bloor Street West (Bloor West/Dundas West)
  • Division 23 – 5230 Finch Avenue West (Kipling/Finch)
  • Division 31 – 40 Norfinch Road (Norfinch/Finch West)
  • Division 33 – 50 Upjohn Road (York Mills/Don Mills)
  • Division 42 – 242 Milner Avenue (Milner/Markham)
  • Division 43 – 4331 Lawrence Ave. E (Lawrence Ave. E/ Kingston Road)
  • Division 51 – 51 Parliament Street (Front/Parliament)
  • Division 52 - 255 Dundas Street West (LOBBY ONLY)
  • Toronto Police Service College – 70 Birmingham Street (Birmingham/Fifth)
  • Toronto Police Service HQ – 40 College Street (College/Bay)

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She dodges the question. "I'll continue working with the people making the decisions at City Hall."

Says she wants to make sure that provincial resources are being allocated properly.

Wynne says politics at City Hall haven't had an impact on ice storm response.

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"We are talking with the decision maker. We are talking with the team. Anthony Haines (Toronto Hydro CEO) is sitting right here."

"We are dealing with decision makers at city hall, the on-the-ground decision makers," she said in response to a media question.

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