Just like last winter, we’ve seen plenty of troughs drop into the Great Lakes throughout spring and through the first half of the summer but the trough the models have for next week, well it would seen like the a summertime version of the ‘polar vortex’.

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This trough would be the mother of all summer troughs, exceptionally deep and would almost certainly present record cool highs and lows in and around the Great Lakes as well as the Upper and Lower Midwest, perhaps all the way to Texas and the Gulf States.

Here’s the latest ECMWF 500mb height anomalies through the upcoming 120 hours which takes us into early and next week when the core of the trough sits right over the Lakes.

72 hrs

96 hrs

126 hrs

Large area starts off next Wednesday at between 15-22 degrees below normal.

Check out the GFS ensemble 7-day mean 2 metre temp anomalies.

Just look at how much of the US is well below normal with some areas 5-12F below, that’s very impressive for a 7 day period at the warmest time of the year.

This GFS 2-metre temps for 12z Tuesday suggests a large area all the way to the Iowa-Missouri border dips into the 40s!

It was a cold one by July standards up in the UP of Michigan this morning. Spincich Lake fell to 32. It will be interesting to see how cool some spots get early to mid next week. Perhaps 40s all the way into the Mid-Mississippi Valley?

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