Environment Canada has issued winter weather alerts for parts of Ontario.
The weather service said a snow squall warning is in effect for areas east of Georgian Bay including Collingwood, Barrie and Hillsdale.
It said the region could see 10-15 cm of snow and significantly reduced visibility.
The squall was expected to end later Sunday afternoon.
Environment Canada has also issued snow squall and winter storm watches for the northeast region of Georgian Bay as well as in northwestern Ontario.
Areas under the weather watch could see heavy snow and strong winds later Sunday and into Monday.