Northern Ontario: Snow Squall Outlook for Tuesday, December 7, 2021

Forecast Discussion

Snow squalls are expected to organize off the eastern shoreline of Lake Huron between Wawa and Sault Ste. Marie starting early Tuesday morning. The squalls will continue throughout the day where the worst conditions are likely to be found during the afternoon and evening as the squalls intensify into one strong squall setting up somewhere near Agawa Bay. In the strongest part of the squall, we could be looking at snowfall rates around 5-10cm per hour so rapid accumulation is likely. Travel will be significantly impacted between Wawa and Sault Ste. Marie especially along the Trans-Canada Hwy which may need to be shut down. Total accumulation may locally approach the 50cm mark in this region with general amounts between 15-30cm for Sault Ste. Marie and Wawa. The snow squall activity will weaken late Tuesday and into Wednesday morning.