Environment Canada has issued a winter weather travel advisory for northern Wellington County, Ont., including Mount Forest and Arthur.
The weather office said strong, gusting winds will create flurries and a risk of snow squalls on Tuesday.
There could be 10 to 15 centimetres of snow on the ground by Wednesday morning, according to the agency.
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Environment Canada said drivers should prepare for poor winter driving conditions, and untreated roads may become snow-covered and slippery.
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The advisory covers London as well as the northern area of southwestern Ontario and also impacts Orangeville and Barrie.