An Alberta clipper is racing across Ontario Thursday that will bring 10-15 cm (4-6 in) of snow to many areas of the province.
In the Sarnia area only about 2-4 cm is expected but Environment Canada meteorologist Geoff Coulson says off lake snow squalls will develop after the system passes through.
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Coulson says off lake accumulations of 5 cm or more are possible across Lambton County overnight and Friday morning.
He says the city of Sarnia itself could see a little lake effect snow with winds blowing down the north-south axis of lake huron.
Coulson says a return to much colder than normal conditions will follow the passage of the clipper.