Midwestern Ontario will be hammered again by lake effect snow over the next couple of days.
According to Environment Canada, some parts of the region could see up to 35 centimetres of snow, while other parts will get as much as 60 centimetres Thursday through Friday.
A snow squall warning in effect for north Huron, north Perth, Grey, Bruce, and north Wellington counties and a winter weather travel advisory for south Huron and south Perth was upgraded to a snow squall watch.
The lake effect snow will bring rapid accumulation and suddenly reduce visibility on the roads. As well, winds will gust up to 60 kilometres an hour from the northwest, resulting in blowing snow.
"Snow squalls cause weather conditions to vary considerably; changes from clear skies to heavy snow within just a few kilometres are common. Travel is expected to be hazardous due to reduced visibility in some locations," Environment Canada said. "Be prepared to adjust your driving with changing road conditions."
The highest accumulation totals are expected for Bruce Peninsula and north Grey County where as much as 60 centimetres of snow could fall. South Huron and south Perth could see the least amount of accumulation roughly 15 centimetres possible throughout the day on Friday.
Grey County declared a significant weather event just before 8 a.m. on Thursday.
Snow squalls could last for some parts of midwestern Ontario through the weekend.