Southern Ontario: Fall Weather Hazards Outlook for Friday, November 26, 2021

Forecast Discussion

A weak system that has been bringing scattered showers to parts of Southern Ontario throughout the day on Thursday is expected to linger into Friday. However, some of the coldest air of the season will flow into the region overnight and early Friday morning which will drop temperatures to well under the freezing mark. This will allow for the rain showers to transition over to wet flurries and light snowfall.

This system is lacking in terms of moisture so significant accumulation isn’t expected outside of the snowbelt except for higher elevations of Central/Eastern Ontario. Some icy road conditions can also be expected during the morning commute on Friday due to the sharp drop in temperatures and earlier rainfall. But the drop isn’t significant enough to be considered a flash freeze.

As for the areas that will see the highest totals, this will be those along the Lake Huron and Georgian Bay shorelines as lake enhancement and embedded snow squalls will help boost the totals above the general system snowfall. The focus will be on areas southwest of the lakes including Goderich, London, Collingwood and Angus where between 10-15cm of snowfall is possible and maybe locally as much as 20cm by the end of Friday.

Further north, more moisture across Algonquin Park and into the Ottawa Valley will allow for snowfall accumulation of between 10-15cm in the higher elevations and around 5-10cm for other areas. Aside from those regions, the rest of Southern Ontario is expecting to see less than 5cm of accumulation on Friday. The snow will come to an end late Friday.