A few showers tonight and Wednesday, cooler on Wednesday; warming trend late this week

The Northland will remain in a NW flow aloft on Wednesday as an mid/upper level low and trough north of Lake Superior early this Tuesday evening moves farther northeast into Quebec by Wednesday evening.

Cold temperatures aloft (500mb temps ~-20C) combined with milder air near the surface will make the atmosphere a bit unstable once again on Wednesday, and this should cause isolated to scattered rain showers to develop again in our area with peak shower coverage likely occurring during the afternoon into the early evening.

CAPE (instability) does look lower on Wednesday compared to what we saw on Tuesday, so we should see less in the way of thunderstorm activity Wednesday, but an isolated thunderstorm along with occasional gusty winds are possible with some of the showers Wednesday afternoon.

Goes-16 water vapor loop from Tuesday, September 7, 2021.

Radar loop from 11 AM to 7:55 PM Tuesday, September 7, 2021 — Showers and thunderstorms erupted in the Northland this afternoon, and a few of the storms were on the strong side producing gusty winds and brief heavy downpours.

Showers and isolated thunderstorms continue to move SE across the area as of 8 PM Tuesday, but this activity should begin to diminish by late this evening.

Local Storm Reports from Tuesday, September 7, 2021

  • 7:05 PM: Thunderstorm Wind Damage. 5 NW Winter, WI (Sawyer County) Trees damaged – A maple uprooted, large poplar snapped off.
  • 7:05 PM: Thunderstorm Wind Damage. 4 NW Winter, WI (Sawyer County) Trees uprooted or snapped; roof blown off.
  • 5:50 PM: Thunderstorm Wind Damage. 3 E Bennett, WI (Douglas County) Sporadic tree and power line damage this location and near Lake Nebagamon.
  • 5:25 PM: Thunderstorm Wind Gust 56 mph. 6 SE Duluth, MN (St. Louis County) Duluth Sky Harbor Airport.
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Here’s a look at the 18z HRRR model simulated radar forecast valid from 7 AM Wednesday to 11 PM Wednesday.

A look at radar rainfall estimates over the past 12 hours (ending 7 PM Tuesday)

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We’re looking at a warming trend once again by Friday with widespread 70s to near 80 degree high temps likely in northeast Minnesota and northwest Wisconsin, but before then it is looking a little cool, but really just close to seasonal temps for Wednesday and Thursday with highs in the mid 60s and low 70s.

Tim

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