Up to 10 centimetres of snowfall can be expected by Thursday evening, with an additional 10 centimetres possible overnight.

Forecasters had said the worst of the weather would target areas north of London and closer to Lake Huron.

The agency says a frontal snow squall is set to cross the region later Tuesday evening, followed by lake effect snow bands in a few areas on Wednesday morning.

Snow squall watches and warnings are in place for a swath of southwestern Ontario off of Lake Huron ahead of storms expected to develop Wednesday morning.

Environment Canada says snowfall amounts of 10 cm are possible by late Wednesday morning.

A snow squall warning has been issued for Midland, Coldwater and Orr Lake, while a snow squall watch is in effect for Barrie, Orillia, Collingwood, Hillsdale, Washago and Lagoon City, Environment Canada says.

Environment Canada says there could be 10 to 15 centimetres of fresh snow on the ground by Thursday morning.

Environment Canada issued a snow squall warning on Friday for Antigonish County, Inverness County, Pictou County and Victoria County. 

"Travel may be hazardous due to sudden changes in the weather," the agency said.

Londoners got their first taste of winter Thursday morning and more is still to come.