A major storm in Ontario isn't just causing headaches for drivers but for hundreds of travellers planning to fly in or out of Canada as well. The snowstorm, which some forecasters have touted as the worst the province has seen since 2008, has already cancelled over 300 hundred flights out of Pearson International Airport on Friday, according to the airport's website.

Environment Canada says the storm is expected to bring around 15 to 25 centimetres of snow to Toronto, with cities like Kingston expecting as much as 30 cm by the time the storm is expected to taper off on Saturday. The snowfall has already prompted travel advisories from Canadian carriers, warning would-be flyers of delays and cancellations.

The CBC reports that WestJet has pre-emptively cancelled 40 flights set to depart on Thursday and Friday in order to dodge a backlog in its schedule. According to the National Post, Air Canada has adjusted its ticketing policy to accommodate travellers flying or transferring from Pearson International Airport and Billy Bishop Toronto City Airport who wish to travel at a different time, and can do so without a penalty.

The carrier is saying that snow, rain and air traffic conditions have impacted flights to and from Sudbury, Ont., Windsor, Ont., and Ottawa. Those hoping to fly into the States should also expect delays as flights to Philadelphia International, New York Airport in Newark, N.J., Logan International Airport in Boston, John F. Kennedy and LaGuardia Airport In New York have also been affected by similar conditions.

In the States, travellers on the Eastern Seaboard are dealing with their own share of obstacles as Winter Storm Nemo is expected to dump as much as a metre of snow in New York And Boston. The Associated Press is reporting that over 2,700 flights have been cancelled so far.

Airports are strongly urging travellers to call airlines in advance to see if their flights have been impacted by either snowstorm. Drivers expecting to pick up passengers who are already flying home are suggested to call airports in advance for up-to-date information on delays. Passengers flying Porter can find more information here. Those flying Air Canada can find read about delays and cancellations here and WestJet passengers can click here for more information.

With Files From The Canadian Press

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toronto snow

Pedestrians cross a snow-covered street in Toronto on Friday, Feb. 8, 2013. THE CANADIAN PRESS/Frank Gunn

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There are reports that commuters are shovelling on-ramps on the 401, one of the busiest highways around the GTA.

A post on Facebook and Instagram both show footage that looks like highway traffic cameras.

snow

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The winter storm hitting Ontario might be an annoyance but the same storm is hitting the northeast U.S. much harder.

From our story:

The heaviest snowfall was expected Friday night and into Saturday. Wind gusts could reach 75 mph. Widespread power failures were feared, along with flooding in coastal areas still recovering from Superstorm Sandy in October.

Boston could get 2 to 3 feet of snow, while New York City was expecting 10 to 14 inches. Mayor Michael Bloomberg said plows and 250,000 tons of salt were being put on standby. To the south, Philadelphia was looking at a possible 2 to 5 inches.

You can get more information on the storm in the U.S. on our live blog.

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@ CP24 : City of Hamilton has declared a snow emergency. Motorists are being advised not to park on snow routes to allow plows to get through

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@ antonnorbert : @HuffPostCanada #snowday from Brampton. My son enjoying the snow outside. http://t.co/DlaHD8Ay

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@ eekiboo : @HuffPostCanada Snow Plows to the rescue - Hurontario St, Mississauga. #GTA #snowday #snowstorm http://t.co/ZiNZmQb2

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WATCH: Winter Storm 'Nemo' Brews Over U.S.

BODY: From NASA: "A massive winter storm is coming together as two low pressure systems are merging over the U.S. East Coast. An animation of satellite imagery from NOAA's GOES-13 satellite from Feb. 6 to Feb. 8 shows the two systems headed for a collision off the mid-Atlantic Coast."

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Today's snowstorm has snarled air traffic all over Ontario, the Eastern seaboard and more. Read our full story.

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@ KatieSimpson24 : Downtown #Toronto ghost town! It NEVER snows this much. cp24 http://t.co/mdVSrU4m

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This probably will not work with your Jack Russell or your chihuahua.

@ WSJcanada : Toronto's big winter storm isn't slowing everyone down, especially not on this west-end street: http://t.co/ElGZlcrJ

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Gawker points out that the U.S. Weather Channel and Weather.com have completely lost their minds over this blizzard hitting the northeast.

From their story:

"At the time of yesterday's site-wide freak, these were the six scrolling stories on Weather.com's homepage: "HISTORIC, EXTREME SNOW"; "YOU MUST PREPARE NOW"; "HOW MUCH WILL YOU GET"; "HISTORIC SNOW TOTALS"; FLOOD THREAT AHEAD"; "SNOW DROUGHT MAY END"

We at HuffPost Canada will remain calm and measured.

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@ CP24 : As of 11 a.m., 18 centimetres of snow has fallen at Pearson airport, says CP24 meteorologist Bill Coulter. http://t.co/bSggZnRY #cp24snow

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NASA has released this photo of the blizzard currently hitting the northeast U.S. and southern Ontario. It's a big one! On the other hand, it looks awfully nice in Florida right now.

nasa snow storm

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Working in your jammies, getting distracted by your cat, bottomless coffee?

Read the full story

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@ VIA_Rail : Storm Update: No cancellations at this time. Some minor delays. Info/Res 888-VIA-Rail. Check your train's status at https://t.co/MYfwe5fp

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@ NPHallMonitor : Is that all you got, snow? http://t.co/Q3YNwJL4

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Both the TDSB and TCDSB have cancelled school buses due to the storm. Schools remain open except at the Island Public/Natural Science school.

The Hamilton-Wentworth School District has cancelled classes for Friday.

The Ottawa-Carleton school board will keep classes open but is cancelling buses.

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Many GTA area universities are closed today.

CLOSED:
Ryerson
Centennial
University of Toronto - Scarborough
University of Toronto - Mississauga
Humber College
Seneca College

York University


OPEN:
University of Toronto (St. George Campus)

George Brown College

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And we know you've got lots of questions.

When will this blasted weather go away?

Will it ruin my weekend plans?

Where are the best toboggan hills?

We'll update you throughout the day with weather and snow-related info.

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Earlier on HuffPost:

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  • Black River near Washago Ontario

    <a href="http://www.huffingtonpost.com/social/jbre"><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/jbre">jbre</a>:<br />

  • Winter in Nunavut

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  • <a href="http://www.huffingtonpost.com/social/CanuckLad"><img style="float:left;padding-right:6px !important;" src="http://i.huffpost.com/profiles/2621903-2-tiny.png?20120801153616" /></a><a href="http://www.huffingtonpost.com/social/CanuckLad">CanuckLad</a>:<br />Near Gimli MB, December 2013

  • <a href="http://www.huffingtonpost.com/social/YankinCanada"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/670707948/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/YankinCanada">YankinCanada</a>:<br />Burlington, Ontario

  • Derry, a one year-old Nova Scotia Duck Tolling Retriever, runs through the snow in Toronto on Sunday, Dec. 15, 2013.

  • Vehicles under a blanket of snow in the Plateau of Montreal, Quebec on Dec. 15. 2013.

  • Snowboarders ride a chairlift at Cypress Mountain in West Vancouver, B.C. Wednesday, Dec. 18, 2013. A lack of snow has left the local mountains with little useable terrain for skiers and snowboarders.

  • Runners brave a winter storm in Halifax on Sunday, Dec.15, 2013. The region is expecting high winds and up to 30 centimetres of snow.

  • Motorists dig out their cars as more than 20 cm of snow fell, Sunday, December 15, 2013 in Montreal.

  • Toronto is hit with another mid-December snowstorm, this time right in the middle of the Tuesday morning commute, Toronto, Ont., Dec. 17, 2013. The city’s skyline can be seen in the distance, with the CN Tower hidden behind a snowy grey sky.

  • A child rides a sled in Oakville, Ont. on Saturday, Dec. 14, 2013. Some areas of southern Ontario received more than 25 centimetres of snow on the day.

  • Winter in Newmarket Ontario

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  • Cat vs. Bunny in the Snow

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  • PJ in the Snow

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  • Mark McMorris, of Regina, falls on his landing during the Big Air event at the FIS Snowboard World Championship in Quebec City, Saturday, January 19, 2013. THE CANADIAN PRESS/Jacques Boissinot

  • Ice Cold

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  • Don Decker starts to clean up during the first major snowstorm of the season, in St. John's, N.L., on Friday Jan. 11, 2013. An estimated 40cm have fallen. THE CANADIAN PRESS/Paul Daly

  • Toronto

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  • Swan Hills, Alberta

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  • An employee of the Saddledome uses a leaf blower to clear snow from the steps of the arena as a light snow falls in Calgary, Alta., Monday, Jan. 14, 2013.THE CANADIAN PRESS/Jeff McIntosh

  • Residents in downtown St. John's try to dig out in the aftermath of a snowstorm that dropped over 40 centimetres of snow by Friday morning, Jan. 11, 2013. THE CANADIAN PRESS/Paul Daly

  • The chapel of the Quebec city Ice Hotel is pictured in Quebec city Sunday January 6, 2013. The first ice hotel in North America, L'Hotel de glace de Quebec is located in Quebec borough of Charlesbourg, 10 km from downtown. The Canadian Press Images/Francis Vachon

  • The Wave

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  • Winter in the North

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  • Frosty window in Toronto

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  • Frozen falls

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  • The Road Home

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  • Whiteshell Provincial Park in Manitoba — a prairie sunset in the winter. Photo Courtesy of <a href="http://hikebiketravel.com/">Leigh McAdam</a>

  • Winter Wonderland

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  • Lighted trail

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  • Jasper national Park

    fall frozen

  • winter looking over river bourgoeis water

    my dog lilo loving the snow this morning

  • Off Leash in the Ravine

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  • Peachland, BC Canada Jan 18th 2013

    Peachland, BC Canada January 18th 2013

  • Leo and Mount Orford

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  • Kamiskotia Lake, Timmins Ontario

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  • Ice Soldiers

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  • Peachland,BC Christmas Day

    Peachland, BC Canada Christmas day 2012. CasandraProbe

  • Port Dover after winter storm

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  • Peachland,BC Canada

    Peachland, Bc Canada Cassandra

  • Sampson

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  • Snowy Aurora

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  • Winter Light

    <a href="http://www.huffingtonpost.com/social/Brian_S_Wyatt"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/681519072/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/Brian_S_Wyatt">Brian S Wyatt</a>:<br />Sunnybrook Park, North York, Ontario, January 9, 2013

  • Beautiful Buck!

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  • Snowed in

    <a href="http://www.huffingtonpost.com/social/Brian_Campbell_Canada"><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/Brian_Campbell_Canada">Brian Campbell Canada</a>:<br />After a 47 cm snowfall in Montreal, Quebec

  • Snowshoe in Rogers Pass

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  • Oliver Horses

    <a href="http://www.huffingtonpost.com/social/marikane"><img style="float:left;padding-right:6px !important;" src="http://graph.facebook.com/534243669/picture?type=square" /></a><a href="http://www.huffingtonpost.com/social/marikane">marikane</a>:<br />In Oliver BC everyone is friendly, even the horses. On the benchlands above town, we met these ranging horses.

  • White Tuesday in Toronto

    A winter view of some parts of Toronto.

  • <a href="https://twitter.com/DebraKirk/status/293814583569813504/photo/1">@DebraKirk: Lake Scugog, Ontario</a>

  • Bitter Cold

    A woman walks through a ravine in Toronto's east end on Tuesday January 22, 2013 as the city issues an extreme weather warning after temperatures drop to minus 24.

  • Sunset in Atlantic Canada

    <a href="http://www.huffingtonpost.com/social/brideaumc"><img style="float:left;padding-right:6px !important;" src="http://images.huffingtonpost.com/twitter_profile_img/4492441.png" /></a><a href="http://www.huffingtonpost.com/social/brideaumc">brideaumc</a>:<br />Sunset in Caraquet New Brunswick taken on January 14th 2013. Temperatures went from 8c to -15c