A snow squall warning is in effect for the Barrie, Orillia, Midland, Collingwood and Innisfil areas.
The snow squall watch issued early Wednesday morning by Environment Canada has now been upgraded to a warning.
According to the weather agency, snow squall bands are expected to extend southeast of Georgian Bay this morning as winds become northwesterly.
Officials say the heavy and blowing snow will reduce visibility, making travel hazardous. Environment Canada says residents should consider postponing non-essential travel until conditions improve.
According to Environment Canada, some areas could receive up to 15 centimetres of snow by Wednesday evening before the snow squalls gradually weaken overnight.