Southern Ontario: Snowfall Outlook for Tuesday, December 28, 2021

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Forecast Discussion

Light snow is expected to continue overnight into Tuesday morning throughout Eastern and Central Ontario. We aren’t expecting much in terms of snowfall accumulation with a centimetre or two of accumulation. We could see between 2-4cm across Sudbury, North Bay and Algonquin Park. Another system will skirt across Lake Erie late Tuesday afternoon which could bring accumulating snow to Deep Southwestern Ontario. Accumulation between 2-6cm is possible for the Windsor and Chatham-Kent area by the end of the day with the majority of the snowfall coming after the dinner hour. The moisture from this system isn’t expected to make it that far north. Roughly north of a line from Goderich to Toronto will see barely any snowfall from this system. Snowfall will taper off just after midnight as the system fizzles out.

Northern Ontario: Snowfall Outlook for Monday, December 27, 2021

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Forecast Discussion

A system is expected to track through Northern Ontario on Monday with a focus on areas around Lake Superior and the International border. Very limited to no snowfall accumulation is expected in Far Northern Ontario. The snow should begin during the morning hours on Monday along the International border and spread to the east by Monday afternoon. This will continue throughout the day with the potential for some blowing snow in some areas. The worst conditions will be found during the morning and afternoon. It will start to move out as we go into the evening but may linger around just past midnight for those near the Quebec border.

As for accumulation, there is a small area just to the southwest of Thunder Bay consistently showing up in the data with the potential to pick up as much as 30cm of snow. Other areas including Kenora, Fort Frances and Thunder Bay can expect around 10-15cm (maybe locally as much as 20cm especially near Thunder Bay). Northeastern Ontario around Lake Superior and into the Timmins area will see around 6-12cm on Monday with a few additional centimetres possible on Tuesday morning.