It could be a very snowy start to the week for parts of midwestern Ontario.
According to Environment Canada, snow squalls will develop off Lake Huron Monday afternoon and could dump between 20 to 30 centimetres of snow on northern Grey, southern Bruce, and the Bruce Peninsula.
A snow squall watch was upgraded to a snow squall warning for those areas just before 6 a.m.
Peak snowfall rates of 2 to 4 centimetres an hour are possible. Environment Canada said.
The lake effect snow is expected to continue into Tuesday afternoon and may even last into Wednesday.
Under squalls, visibility will be reduced significantly. Drivers should be prepared for quickly changing and deteriorating travel conditions.
"If visibility is reduced while driving, slow down, watch for tail lights ahead and be prepared to stop," said Environment Canada.
Overnight snowfall in Huron, Perth, Grey, and Bruce counties has left a lot of roads mostly snow covered and slick. Snow plow operators are out working to clear the roads. However, there are numerous bus cancellations including in Listowel, Goderich, Hanover, Kincardine, and Owen Sound. You can see the full list on our closures page.
Only 2 to 5 centimetres of snow is forecast to fall across Huron and Perth counties on Monday.