Cool tonight with areas of frost inland from Lake Superior; Dry and very pleasant Thursday; Cooler and breezy with a few showers possible Friday

A frost advisory is in effect from 1 AM to 8 AM Thursday for all of northwest Wisconsin, and for portions of northeast and east-central Minnesota inland from Lake Superior including the cities of Isabella, Hibbing, Duluth, Cloquet, Carlton, Moose Lake, Hinckley, Pine City, Superior, Solon Springs, Port Wing, Washburn, Bayfield, Ashland, Hurley, Gile, Minong, Siren, Grantsburg, Danbury, Spooner, Shell Lake, Hayward and Winter.

Temperatures in the lower to middle 30s will result in frost formation.

Frost could kill sensitive outdoor vegetation if left uncovered.

Low Temperature reports from Wednesday morning, September 22, 2021

Hibbing, MN: 29 F
Ely, MN: 30 F
Crane Lake, MN: 30 F
2 E Celina, MN: 30 F
Cotton, MN: 30 F
2 S Tower, MN: 30 F
Floodwood, MN: 32 F
Cook, MN: 32 F
Eveleth, MN: 32 F
Aitkin, MN: 32 F
McGregor, MN: 32 F
Solon Springs, WI: 32 F
Grand Marais Airport: 34 F
Siren, WI: 34 F
Superior Airport: 35 F
Two Harbors, MN: 36 F
Bigfork, MN: 36 F
Longville, MN: 36 F
Pine River, MN: 36 F
Hinckley, MN: 36 F
Cloquet, MN: 36 F
Grand Rapids, MN: 37 F
Brainerd, MN: 37 F
Ashland, WI: 37 F
Hayward, WI: 39 F
Duluth Airport: 39 F (Coldest temperature in Duluth since 5/29/2021, low of 29 F)
International Falls, MN: 39 F
Orr, MN: 39 F
Hurley, WI: 39 F

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Another very nice day is ahead for Thursday with high temperatures in the Northland ranging from the upper 60s to lower 70s which is roughly 5 degrees or so above normal for late September.

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18z NAM model 500mb vorticity forecast valid from 7 AM Friday to 7 AM Saturday – A late week system will impact the Northland, and it looks pretty potent (dynamically speaking) with even hints of a closed upper level low developing once this system gets east of our area, but it will be lacking deep moisture, thus only a few showers are anticipated the way it looks now.

A cold front and strong upper level low will move across the Northland on Friday, and this front and upper low could bring a few showers as it crosses the area, but widespread significant rains are not expected with this system.

18z NAM 3km model simulated radar forecast valid from 1 AM Friday to 1 AM Saturday.

Tim

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