TORONTO - Environment Canada has ended wind warnings for most of southern Ontario, which is among the areas being lashed by superstorm Sandy.

However, the warning remains in effect in Sarnia, in southwestern Ontario, which the agency says had among the highest gusts at 100 km/h.

Quebec and parts of the Maritimes are also being hit by Sandy this morning as the massive weather system churns its way north.

The destructive post-tropical storm has already wheeled through the northeastern U-S -- where it has been responsible for flooding, widespread power outages and at least 16 deaths.

It's has also walloped parts of Canada with strong winds and heavy rain.

Southern Ontario is expected to bear the brunt of the storm today, with powerful winds being more of a concern for forecasters than the rain.

Those gusts claimed a life in Toronto last night. Police say a woman was killed by a falling sign as winds blowing at about 65 kilometres per hour whipped the city.

Tens of thousands of customers are without electricity in both Ontario and Quebec.