Northern Ontario: Fall Weather Hazards Outlook for Sunday, November 21, 2021

Forecast Discussion

Light to moderate snowfall is expected to spread across Northern Ontario throughout the day on Sunday starting with the more western part of the province earlier in the day and reaching Northeastern Ontario by the late afternoon. Snowfall rates won’t be particularly impressive due to the lack of moisture that this system has to work with. We’re expected general snowfall totals by the end of Sunday between 5-10cm for much of Northern Ontario with locally up to 15cm in some pockets. Under 5cm is expected for the Thunder Bay area as they’ll miss most of the precipitation and the North Bay, Elliot Lake and Sudbury region will see more of a rain/snow mix which should keep accumulation under 5cm.

In addition to the system snow, some lake effect snow and localized snow squalls could develop east of Lake Superior late Sunday. The corridor between Wawa and Sault Ste. Marie may see locally as much as 20cm when combining the system and lake effect snow. Snow will linger into Monday which could deliver another 5cm of snow accumulation with locally 10-15cm in the lake effect zone east of Lake Superior. This will be covered in Monday’s outlook.