Blustery! Very cold tonight and Thanksgiving; Lake effect snow showers for the South Shore and a few flurries elsewhere tonight; Sunshine Thursday

A much colder air mass is pushing south out of central Canada and into the Northland this afternoon and this cold air will be with us into Friday before we see milder temperatures return this weekend. The coldest day will be on Thanksgiving, this is when daytime highs will only reach the 10s to around 20 in northeast Minnesota and northwest Wisconsin.

Temperatures will warm a bit on Friday with highs in the 20s and lower 30s, with widespread 30s expected this weekend for daytime highs.

Nothing but NW flow for the foreseeable future. What this means for us is an occasional clipper type system with a chance for a little snow every now and then, but there are no consistent signals showing up in computer models for a major snow event impacting the Northland through much of next week, so if you like lots of snow, you’re not going to like this forecast.

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A period of lake effect snow is likely tonight into Thursday morning over northwest Wisconsin, mainly affecting portions of Ashland and Iron Counties where new snow accumulations of 1 to 4 inches are possible. The rest of the Northland can expect a few snow flurries tonight.

18z NAM 3km model simulated radar forecast ending Noon Thursday.

Strong cold advection pattern is taking place this afternoon with 850mb temperatures ranging from around -2C in east-central Minnesota to -16C north of the border, and that air mass is surging south and will be over us on Thursday with 850mb temps in the -12 to -18C range in the Northland.

We’re only going to get a glancing blow from a large pool of arctic air which covers much of northern Canada and parts of Alaska today where afternoon temperatures are still in the -10s and -20s, we won’t be nearly that cold in the Northland over the next few days, but it will be chilly!

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An interesting satellite loop in the Northland today. Note the mainly clear sky over western Lake Superior, and also near the immediate lakeshore (along the North Shore) while skies were mainly overcast farther inland from Lake Superior this afternoon. I’m not an expert by any means, but I think the reason behind this was due to a N-NW or a downslope wind causing the air to sink which led to a mostly sunny afternoon if you were close to Lake Superior, while a little farther inland skies were generally mostly cloudy this afternoon.

Goes-16 visible satellite loop from Wednesday, November 24, 2021.

Tim

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