Here's what Ottawa bureau reporter Arda Ocal had to say about the kind of conditions awaiting drivers in the National Capital Region around noon:

That's on top of around 31 cm of snow that had fallen on the city by 8 a.m.

Police and emergency services were warning people to stay off the roads, and be cautious if travel is necessary.

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The Canadian Press reported Sunday morning that weather was believed to have been a factor in three fatal collisions in Quebec on Saturday, and another in Ontario.

With the roads even worse Sunday, the TTC reported temporary service shut downs on some streetcar routes, while railway service was also delayed or temporarily shut down.

Numerous flight cancellations were reported at airports in Toronto, Ottawa and Montreal.

Rachel Schoulten was at Pearson Airport earlier Sunday:

As for total accumulations, the Kingston area was by far the worst hit, seeing more than 50 hours of freezing rain since Friday as of noon Sunday. Other communities saw almost as much, and Toronto's Pearson Airport reported more than 40 hours.

By the time Sunday comes to an end, parts of the Golden Horseshoe and southwestern Ontario could see freezing rain totals of up to 40 mm. In Kingston, eastern Ontario and southern Quebec, that number could be as much as 60 mm.

As the day wears on, the rain should switch over to non-freezing rain in the southern GTA, Golden Horseshoe and Niagara regions, but freezing rain will still be a risk in a huge slice of the province.

Further north, up to 20 cm of snow could fall on areas east of Georgian Bay.

The storm's worst strength is en route to Atlantic Canada.

With files from the Canadian Press.