TORONTO - Environment Canada warned Wednesday that a dangerous snow storm was moving into the southern and eastern regions of Ontario as a winter weather system headed north from the U.S.
The agency said in a special weather statement that much of the province will be hit with a dump of snow starting Wednesday afternoon as the outer reaches of a snow system making its way north from Kentucky crosses into southwestern Ontario.
Meteorologist Arnold Ashton said the system will then move east and eventually deliver snow to parts of southern Quebec and New Brunswick on Thursday.
"It's the combination of snow and blowing snow that makes this particularly nasty," Ashton said.
Environment Canada said the areas of Dunnville and Niagara in southwestern Ontario and the stretch between Kingston and Cornwall in the east will bear the worst of the storm, getting 15 to 20 centimetres of snow.
The weather agency said other communities in those regions can expect up to 15 cm of snow, while central Ontario residents should get their snow shovels ready for 5 to 10 cm.
Ashton said the Greater Toronto Area is set for the most snow it's seen since 2010.
"Two years ago we got 10 centimetres and we may get that much snow in the GTA today," he said Wednesday, adding the storm will slide towards Ontario's border with Quebec throughout the evening.
"It's pretty nasty anywhere you go. Basically the whole (Highway) 401 corridor" will be affected, he said.
"If you can stay at home or stay at a relative's or a friend's a little bit longer and work around this storm, it will certainly be improving tomorrow. It's just tonight we are getting the brunt of it."
Ashton said conditions will be back to normal Thursday — just-freezing temperatures and clearer-skies — as the system leaves Ontario.
The storm sent air travellers in Toronto scrambling for the second day in a row Wednesday as scheduled flights were scrapped over the impending storm.
Toronto's Pearson International Airport delayed or cancelled more than 100 incoming and outgoing flights to Canada and the U.S. Travellers are advised to double check their flight status before making their way to the airport.
South of the border, a powerful winter storm system has been pounding the U.S. midsection and is blamed for at least six deaths.
Two passengers in a car on a sleet-slickened Arkansas highway were killed Wednesday in a head-on collision, and two people were killed Tuesday on Oklahoma highways. Deaths from wind-toppled trees were reported in Texas and Louisiana.
Earlier on HuffPost:
Michael Stilson of Windber, Pa., shovels wet-heavy snow along Graham Ave. in Windber, Somerset County, Monday, April 23, 2012.(AP)
JACKSON TOWNSHIP, PA
Snow blankets the trees and a road in Jackson Township, Pa., Monday, April 23, 2012. A spring nor'easter packing soaking rain and high winds churned up the Northeast Monday morning, unleashing a burst of winter and up to a foot of snow in higher elevations inland, closing some schools and sparking concerns of power outages. (AP Photo)
Two girls sit on sculptures amid the snow at Glenshee on April 4, 2012 in Glenshee, Scotland. (Jeff J Mitchell/Getty Images)
A rainbow appears as water splashes a local walking on the Sebastopol sea-front on March 3, 2012. (GENYA SAVILOV/AFP/Getty Images)
Palestinians walk during a snow storm in the West Bank city of Hebron as wintry weather swept through the region on March 2, 2012. (MENAHEM KAHANA/AFP/Getty Images)
Palle-Jooseppi, a male brown bear of Ranua Zoo, begins to wake up after winter hibernation in Ranua on February 23, 2012. (KAISA SIREN/AFP/Getty Images)
Rushing Dasher ridden by Natalie Friberg (c) leads the field in to the second turn during the Grand Prix Prestige race at the White Turf horse racing meeting held on the frozen Lake St Moritz on February 19, 2012 in St Moritz, Switzerland. (Photo by Alex Livesey/Getty Images)
Golfers practice at the driving range Wednesday, Feb. 22, 2012 in Concord, N.H. The range opened early this year because of a mild winter. (AP Photo/Jim Cole)
A man races his six-dog sled during the winter carnival on Jan. 28. (photo THE CANADIAN PRESS/Jacques Boissinot)
Sea smoke hugs the Kitimat, BC, harbour on Jan 19, 2012, surrounding the tug Smit Cecil and obscuring an empty barge anchored off the dock. Warmer fresh water from the Kitimat River is caught between the ocean water in the harbour and the frigid air, creating the sea smoke which is then caught by the wind. Kitimat was experiencing -23 C air temperature on this day, a windchill of -38 as arctic air kept much of Canada in the first deep freeze of the winter. (The Canadian Press Images/Robin Rowland)
Patrick O'Hara enjoys a walk through Springbank Park in London's west end with his daughter Quinn and grandson Aidan. (photo: The Canadian Press Images/Mark Spowart)
David Ferguson attempts to stay warm on his walk home from work -27C weather (with the wind chill it felt like -40C) in Saskatoon, Wednesday, January 18, 2012. (THE CANADIAN PRESS/Liam Richards)
Lucy Venegas, a soccer referee from Mexico in the city for the CONCACAF women's Olympic qualifying tournament, catches snowflakes in her mouth in downtown Vancouver, B.C., on Wednesday January 18, 2012. Cold weather has enveloped the lower mainland with Vancouverites dealing with temperatures 10 degrees below normal. (THE CANADIAN PRESS/Darryl Dyck)
A cyclist is framed by icicles hanging from Christmas lights on a tree in Vancouver, B.C., on Wednesday January 18, 2012. Cold weather has enveloped the lower mainland with Vancouverites dealing with temperatures 10 degrees below normal. (THE CANADIAN PRESS/Darryl Dyck)
A horse-drawn carriage makes its way down a street in Old Montreal during snowfall Thursday, Jan. 12, 2012. CANADIAN PRESS/Paul Chiasson.
Pedestrians brave the blustery winter weather as a storm system hits Ottawa on Thursday, Jan. 12, 2012. THE CANADIAN PRESS/Sean Kilpatrick.
Joe Graham works to clear snow from the front of his family's business in Dubuque, Iowa, Thursday, Jan. 12, 2012. AP PHOTO.
A motorist clears snow from their vehicle in Halifax on Wednesday, Nov. 23, 2011. A blast of wintry weather descended on the Maritimes causing numerous accidents, closing schools and delaying flights.THE CANADIAN PRESS/Andrew Vaughan
Karen Kelly shovels a walkway as snow removal crews clean up on Parliament Hill in Ottawa on Wednesday, November 23, 2011, after the first snowfall of the season brought upwards of 10 cm of snow to the nation's capital. (THE CANADIAN PRESS/Sean Kilpatrick)
A woman cleans snow from her car in Montreal, Wednesday, November 23, 2011 as the first heavy snowfall of winter hits Montreal and surrounding areas. THE CANADIAN PRESS/Graham Hughes
Minister of Justice Rob Nicholson makes his way along Wellington Street during a snowfall in Ottawa on Wednesday, November 23, 2011. The first snowfall of the season brought upwards of 10 cm of snow to the Nations capital. (THE CANADIAN PRESS/Sean Kilpatrick)
Beijingers walk through the first snowfall of the year at a section of the rebuilt city wall in Beijing on December 2, 2011. (MARK RALSTON/AFP/Getty Images)
Shoppers walk past large piles of snow in Samara's Leningradskaya Street on November 10, 2011 in Samara, Russia. Samara is one of thirteen proposed host cities as Russia prepares to host the 2018 FIFA World Cup. (Photo by Harry Engels/Getty Images)
A horse stands in the intense wind and snow Monday, Dec., 5, 2011 near his corral off of Highway 70 in Las Cruces, N.M. Snowfall started to blanket the City of the Crosses at about 11 a.m. and steadily continued throughout the day. (AP Photo/Las Cruces Sun-News, Shari V. Hill)
Traffic backs up behind snow plows clearing a street in Denver on Thursday, Dec. 1, 2011. As much as seven inches of snow is in the forecast for the Mile High City on Thursday. (AP Photo/Ed Andrieski)
Ruth Chauff, of New Orleans, laughs after making a small snowman near Point Park on Tuesday, Nov. 29, 2011., after snow fell across the Chattanooga, Tenn., area. She made a snowman with her daughter April Fontenot, not seen. (AP Photo/Chattanooga Times Free Press, Jake Daniels)
Snow covers Narikala, an ancient fortress dominating Tbilisi, the capital of Georgia on Monday, Nov. 28, 2011. (AP Photo/Shakh Aivazov)
Leaves and snow rest on the ground after a winter storm October 30, 2011 in Hartsville, Pennsylvania. Thousands in Pennsylvania and Delaware were left without power from the early winter storm that left up to 10 inches of snow in parts of the states. (Photo by William Thomas Cain/Getty Images)
SIGNAL MOUNTAIN, TENN.
An early snow covers tackling dummies at Signal Mountain High School football practice field, in Signal Mountain, Tenn., early Tuesday morning, Nov. 29, 2011. The snowfall is considered early for the region. (AP Photo/Chattanooga Times Free Press, Dan Henry)
Paul Worsowicz watches his putt during the traditional 29th annual Thanksgiving Day golf tournament Thursday, Nov. 24, 2011 in Concord, N.H. More than 100 players showed up at sunrise to play nine holes in the snow covered course.(AP Photo/Jim Cole)
EAST MONTPELIER, VT.
A flock of wild turkeys walk through a snow-covered field Wednesday, Nov. 23, 2011 in East Montpelier, Vt. Snow mixed with sleet and freezing rain is knocking out power to thousands of Vermonters and making the morning commute a slippery one.(AP Photo/Toby Talbot)