Areas near the Lake Huron shore were likely to see considerable snowfall, but Woodstock had been spared the worst of it so far, Coulson said. The warmer-than-usual November that kept lake temperatures mild, coupled with the blast of Arctic air entering the region, is a culprit behind this intense bout of lake-effect snow, he said.

Heavy snow slammed the Great Lakes region during Thanksgiving weekend, clogging communities with several feet of snow.

After U.S. travelers battled through harsh weekend weather to reach home following the Thanksgiving holiday, forecasters say residents of the Great Lakes region face the prospect of more snow through

In Toronto, east winds coming across Lake Ontario are the culprit for their lake-effect snow, Coulson said. Lake-effect snow does happen on Lake Erie too, Coulson said, but Lake Huron is usually the cause of the big lake-effect snow events in the London region.

The snow has been falling, piling up to over five feet over the weekend, in an area known for snowfall, commonly called the “snow belt.” Lake Effect snow occurs when cold wind

Heavy lake-effect snow hit the region over Thanksgiving weekend, with up to 20 inches of snow still to come early this week.

Lake effect snow is slamming the Great Lakes, with seven states from Wisconsin to New York under snow alerts on Monday.