Highway 401 multi-vehicle crash near Kingston, ON, 01 Dec 2019 (OPP/Twitter)
A low pressure system delivered an icy mix of precipitation to Southern Ontario on Sunday with freezing rain and ice pellets turning highways and walkways into ice rinks.
Ontario Provincial Police say heavy snow shut down a section of Highway 401 near Kingston after a 30 to 40 vehicle pileup with more than a dozen injured and one fatality.
At least 500 road crashes were reported in the Greater Toronto Area and numerous flights were either cancelled or delayed at Pearson Airport.
Tens of thousands lost electricity after ice-laden tree branches fell onto power lines,
Several towns and cities were forced to cancel their Santa Claus Parades due to the extreme weather.
Heavy snow in Kingston, ON, 21 Nov 2016 (Twitter)
A Colorado Low brought an early taste of winter to a large swath of Central Canada.
Most of the region saw its first measurable snow of the season with the highest amounts in eastern Ontario (Ottawa 16 cm, Kingston 18 cm) and western Quebec (Mont-Tremblant 15 cm, Montreal 5 cm).
Strong winds were also a factor gusting up to 70 km/h in the Greater Toronto Area and even up to 90 km/h in some areas.
Heavy lake effect snow also pounded neighbouring New York State with up to 50 cm in Rochester and Syracuse.
27-28 Dec 2012 (courtesy Accuweather.com)
For many in Southern Ontario, this wintry wallop was the first major snowstorm of the season dumping about 15 cm of snow on Windsor, Toronto and Hamilton with 20 cm in Ottawa and 30 cm in Kingston.
Montreal could receive as much as 40 cm of snow while Quebec City can expect about 20 cm.
The storm actually originated in the American South dropping rare post-Christmas snow on cities like Dallas, Texas and Little Rock, Arkansas.
After hammering the U.S. Northeast with snow and rain, the storm is now moving into New Brunswick and Nova Scotia with snow, strong gusty winds and rain along the Atlantic coast.