Light snow and flurries will continue to move through northeast Minnesota and northwest Wisconsin this evening with snowfall accumulations of only a half inch to an inch at most. Snow ends from west to east by mid or late evening.
Note: Low temperature of -3 F at the Duluth Airport this morning, Tuesday, December 15, 2020, this is the first time this month with a subzero temperature in Duluth, and this is also the first subzero temp in Duluth since late last February on the 28th (low was also -3 F)
Temperatures don’t look bad at all in Duluth over the next several days, but keep an eye on the forecast on Christmas Eve and Christmas Day as there is some potential for a more potent arctic blast around that time frame, but not all models agree on that happening, but if it does we could be talking about highs of 0 or colder, and overnight lows in the teens and 20s below zero across the Northland. Stay tuned.
A few disturbances will be passing through the Northland over the next few days. The first moves through late Wednesday/early Thursday, followed by a second disturbance in the Friday/Friday night time frame, both look pretty weak in the amount of lift/forcing and snowfall potential.
18z NAM model 500mb vorticity forecast valid from 6 AM Wednesday to Midnight Saturday.
Areas of light snow and flurries will continue over parts of northeast Minnesota and northwest Wisconsin this evening but should diminish by late tonight. And then will look off to the west where the next round of light snow and flurries gets going, and this batch of flakes will move east into the Northland Wednesday evening into early Thursday morning. Note: Snowfall amounts of a half inch to an inch are possible through Thursday morning, but an isolated 1 or 2 inch total can’t be ruled out, especially along the North Shore from around Taconite Harbor to Grand Marais due to some lake effect potential tonight and Wednesday.
Here’s the 18z HRRR model simulated radar forecast valid from Midnight tonight to 7 AM Thursday.
Another snow event hitting parts of Oklahoma and nearby states today, and this is the system which will eventually turn into a powerful winter storm Wednesday and Thursday as it impacts the Northeast US.
Goes-16 water vapor loop from Tuesday, December 15, 2020 (loop time 2:26 PM to 5:21 PM CT)
NWS snowfall forecast for the Nor’easter which will affect parts of the Mid-Atlantic and Northeast US Wednesday and Thursday.
Snowfall totals of 12-18+” are possible in some areas.
Winter storm warning in pink, watch in blue, advisory in purple.