A snow squall warning is in effect for the Barrie, Orillia, Collingwood and Midland areas.
Environment Canada issued the warning, saying snow squalls will occur in the region on Friday, with some areas expected to receive between 15 and 25 centimetres of snow by Saturday morning.
Officials say the latest analysis suggests a particularly intense band of snow could develop from the Bruce Peninsula toward the Orillia area Friday evening.
The band may be very slow moving or stationary for several hours Friday night, officials say.
Environment Canada says areas under the band could see snowfall accumulations well in excess of 30 centimetres by Saturday morning.
Officials say the squalls should weaken and eventually dissipate on Saturday, as southwest winds bring slightly warmer temperatures.
Environment Canada is warning residents that snow squalls can cause weather conditions to vary considerably. Clear skies can change to heavy snow in just a few kilometres.
Officials say heavy, blowing snow may cause visibility to be reduced to near zero at times, making travel hazardous.
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