Frost and Freeze likely across much of the Northland tonight; watching rain chances for Friday night and Saturday

-Freeze Warning in effect from Midnight tonight to 8 AM Wednesday including the cities of International Falls, Bigfork, Grand Rapids, Walker, Hill City, Hibbing, Cook, Ely and Isabella.

Sub-freezing temperatures in the upper 20s and lower 30s. Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

-Frost Advisory in effect from Midnight tonight to 8 AM Wednesday including the cities of Brainerd, Aitkin, McGregor, Hinckley, Moose Lake, Cloquet, Duluth, Two Harbors, Silver Bay, Grand Marais, Superior, Solon Springs, Washburn, Bayfield, Ashland, Hurley, Siren, Grantsburg, Minong, Shell Lake, Spooner, Hayward and Winter.

Temperatures as low as 32 degrees will result in frost formation. Frost could kill sensitive outdoor vegetation if left uncovered.

Note: Locations within about 10 miles of Lake Superior may see some patchy frost develop late tonight, although the better chances for frost are expected to be further inland from Lake Superior tonight.

Source: https://www.weather.gov/dlh/

There is quite a bit of cloud cover across the Northland this afternoon, although some clearing has taken place over northern Minnesota. If clouds linger most of the night, then temperatures may end up slightly warmer for some parts of the area which may diminish the threat for a freeze or frost overnight.

Loop ends ~5:15 PM Tuesday, September 8, 2020.

Source: https://weather.cod.edu/

Low Temperature Reports from Tuesday morning, September 8, 2020

Source: https://www.weather.gov/dlh/

Grand Marais Airport: 28 F
Babbitt, MN: 29 F
Crane Lake, MN: 30 F
Ely, MN: 30 F
Isabella, MN: 31 F
Cotton, MN: 31 F
Chisholm-Hibbing Airport: 31 F
Cook, MN: 32 F
Superior Airport: 32 F
Hermantown, MN: 33 F
Glidden, WI: 33 F
Saginaw, MN: 34 F
South Range, WI: 34 F
Aitkin, MN: 34 F
Bigfork, MN: 34 F
Hayward, WI: 34 F
Solon Springs, WI: 34 F
International Falls, MN: 34 F
Hill City, MN: 35 F
Duluth Airport: 36 F
Esko, MN: 36 F
Ashland, WI: 36 F
Cloquet, MN: 36 F
Two Harbors, MN: 36 F
Hinckley, MN: 37 F
Moose Lake, MN: 37 F
Duluth Harbor: 43 F

September 7th featured record or near record cold MAXIMUM temperatures in the Northland.

Brainerd: High of 55 degrees, tied their record cold high temp of 55 degrees which was set on September 7th, 1929.

International Falls: High of 54 degrees (2nd coldest high temp on record) coldest high on record is 50 degrees set on September 7th, 1968.

Hibbing: High of 52 degrees (2nd coldest high temp on record) coldest high on record is 51 degrees set on September 7th, 1968.

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Purple (barney colors) are never a good thing on a temperature map, unless you like an unseasonably cold air mass!

What A Cold Front! Incredible temperature change over the last 24 hours across the Rockies and Plains.

Source: RTMA model; https://lab.weathermodels.com/

Snow has been falling for most of the day in the Denver area (blue and purple colors on the map)

The temperature change in Denver has been incredible over the last few days – Check it out

September 5th: 101 degrees

September 6th: 98 degrees

September 7th: 93 degrees

September 8th: Around 35 degrees and snowing!

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A powerful and unusually strong trough has dug well to the south today. Also of note is the feature spinning over the Southern Rockies today, this system will eventually make its way NE affecting the Northland in the Friday night and Saturday time frame.

Source: Goes-16 water vapor loop, Tuesday, September 8, 2020; https://weather.cod.edu/

Really a fascinating satellite loop from today showing a strong low pressure system over the Southern Rockies while widespread smoke from ongoing fires gets ingested into the low pressure circulation. Note: The smoke plume extends from southwest Oregon thru much of California into central Arizona and New Mexico this afternoon.

The system over the Southern Rockies today will lift NE late this week, likely reaching the upper Midwest on Saturday. Will see some rain as this low moves through the Northland Friday night and lingering into Saturday the way it looks now.

Source: 18z NAM model 9.8.2020; https://weather.cod.edu/

Computer models have increased rainfall totals for the system Friday night and Saturday, they have also shifted the higher rain totals a bit more to the north compared to 24 hours. This system is still a few days away, and we could see a few more changes on the track/timing/amount of rain over the next few days. Stay tuned.

As for the timing of rain in Duluth and Superior – At the moment it looks like we would stay dry during the day Friday and into early Friday evening, then rain chances would increase late Friday evening and through the overnight. Rain would continue into Saturday morning, possibly tapering off to only a few showers Saturday afternoon.

Source: https://lab.weathermodels.com/

Thanks for reading!

Tim

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