Northern Ontario: Snowfall Outlook for Sunday, December 19, 2021

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Forecast Discussion

A system will slide into Northwestern Ontario from Northern Manitoba during the afternoon on Sunday. This will bring the potential for accumulating snow for those near the Manitoba border and into Far Northern Ontario. Total accumulation of around 6-12cm is possible with localized pockets picking up to 15cm by the end of Sunday. Lake enhancement around the northern shoreline of Lake Superior may also boost totals into the 6-12cm range. The snow will continue into early Monday with the chance of up to 5-10cm of accumulation along the Quebec border and up into Moosonee. It will fully clear out by Monday afternoon as the system moves out over Quebec. Blowing snow may also be an issue at times with wind gusts reaching 20-40km/h late Sunday and continuing overnight.

Southern Ontario: Snowfall Outlook for Saturday, December 18, 2021

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Forecast Discussion

A system is expected to slide across the Lower Great Lake on Saturday and bring accumulating snowfall to parts of Southern Ontario. Precipitation will start to move into our region from the west during the mid to late morning hours with snowfall spreading eastward throughout the late morning. Eastern Ontario should see the first flakes sometime around the lunch hour and will further intensify later in the day. This steady snowfall will continue throughout the afternoon and into the early evening before clearing from west to east. We expect the bulk of the snow to be finished by midnight although flurries may continue to linger around into the overnight hours, especially for Eastern Ontario. Closer to Lake Erie and into Deep Southwestern Ontario, it will be just warm enough to allow for some rain to mix in with the snow which would reduce accumulation.

We’re looking at widespread snowfall totals ranging from 6-12cm from Sarnia to London through the GTA and into much of Eastern Ontario. There is the potential for a few areas to approach 15cm, especially over the higher elevations of the Dundalk Highlands and along the Internation border in Eastern Ontario. Lower amounts for regions east Georgian Bay where less moisture will be present along with the Lake Erie shoreline due to the mixed precipitation. Blowing snow could be an issue around Lake Ontario where wind gusts may reach 30-50km/h during the day on Saturday.

Southern Ontario: Winter Weather Hazards Outlook for Saturday, December 18, 2021

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Forecast Discussion

A system could bring accumulating snow between 5-15cm on Saturday to parts of Southern Ontario. The heaviest snow appears to be around Lake Ontario and into Eastern Ontario although that may change. There is very low agreement between the models at the moment. More details in a forecast to be released on Friday.

Southern Ontario: Snowfall Outlook for Saturday, December 18, 2021

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Forecast Discussion

A system could bring accumulating snow between 5-15cm on Saturday to parts of Southern Ontario. The heaviest snow appears to be around Lake Ontario and into Eastern Ontario although that may change. There is very low agreement between the models at the moment. More details in a forecast to be released on Friday.