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Diving temperatures will chill Atlantic Canada before late-week storm

Monday, January 18th 2021, 6:33 pm - After some lingering snow Tuesday, eyes turn to a late-week storm that threatens significant snow over Newfoundland.

Conditions will remain unsettled for parts of Atlantic Canada Tuesday, with some lingering snow for the region, courtesy of weak systems passing through and sea-effect once they depart. Temperatures will take a considerable dive this week as a pattern change will send a shot of Arctic air into the region. Wednesday is forecast to be the coldest day since February 2020 for parts of the soutnern Maritimes. Beyond, there is the potential for a potent storm to impact parts of Newfoundland late week, threatening significant snow into the weekend. More on the impact and timing, below.


  • Incoming pattern change will see temperatures plummet for much of Eastern Canada
  • Sea-effect snow sets up Tuesday evening in behind low in western Newfoundland, P.E.I., eastern Nova Scotia
  • Forecasters keeping a close eye on a late-week system that threatens significant snow over Newfoundland


A pattern change will see Arctic air finally seeping into Atlantic Canada as the week progresses, forcing temperatures to gradually take a dive.

Wednesday could end up being the coldest day since February 2020 for parts of the southern Maritimes, especially for some areas across New Brunswick.

Precipitation-wise, effects from a low-pressure system skirting by Newfoundland with a rain-snow mix Monday night will continue Tuesday. Rain will will change to wet snow in the morning, tapering off in the afternoon.

ATLsnow (MonPM)

On the other side of the Gulf, parts of the Maritimes will see a bit of snow during the day, as well, thanks to a weak system trailing the low.

In behind the system, there will be lingering sea-effect snow in the evening Tuesday across western Newfoundland, P.E.I. and eastern Nova Scotia.

The Avalon can expect to see an additional 10-15 mm of rain from this system, with about 5 cm of snow expected for inland regions through Wednesday morning. The northern and western coastal areas of the island may see 10-15 cm of snow.


A storm will develop south of the Maritimes on Wednesday, yet staying too far south of the region for any impact. It will then track south and east of the Avalon on Thursday and Friday, possibly tracking close enough to become a major winter storm with strong winds and heavy snow across eastern Newfoundland.

Special weather statements are already in place for the island, while winter storm watches are in effect for Labrador.


"A strong blocking pattern over the North Atlantic will cause the storm to stall over the Atlantic with additional areas of low pressure tracking from east to west into the region and additional periods of snow through the weekend and into early next week," says Weather Network meteorologist Dr. Doug Gillham.

Snow totals could be rather impressive across eastern Newfoundland, with 50+ cm possible through early next week.

"But we could also see a rain snow mix at times, which would hold totals down," says Gillham, adding that snow totals will also be highly dependent on the track of the low.

Be sure to check back as we continue to monitor the pattern change across Atlantic Canada.

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