Environment Canada has upgraded a snow squall watch to a snow squall warning for Grey-Bruce and Huron-Perth counties.
Squalls are expected to last from Sunday afternoon into Tuesday.
"A sharp cold front will move through the area [Sunday] morning ushering in very cold Arctic air. Snow squalls are expected to develop over Lake Huron and Georgian Bay [Sunday] afternoon. These squalls may briefly move north of the region overnight but will move back in Monday morning," the weather agency said in a statement.
The resulting lake effect snow could fall at rates of 15 to 25 centimeters over 12 hours.
"Travel may be hazardous due to sudden changes in the weather. Visibility may be significantly and suddenly reduced to near zero," the agency advised.
Motorists should be aware of heavy, blowing snow and snow-covered, icy roads.
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