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The summer 'Polar Vortex!'

by Ben Pine

WHAS11.com

Posted on July 10, 2014 at 11:00 AM

Updated Thursday, Jul 10 at 11:01 AM

We all know what the Polar Vortex did to us last winter, but what kind of weather can a summertime Polar Vortex produce? 

Before we dig in, remember, the Polar Vortex is a normal, year-long circulation around the Earth near the Polar regions.  The circulation wobbles, and sometimes shifts cooler air south.  This looks to be the situation for us next Tuesday-Wednesday.  

Notice on the first map below, the GFS weather model forecast low temperatures by Wednesday morning (7/16).   The GFS is calling for widespread lows in the 50s throughout the Midwest and Great Lakes.  Highs expected in the 70s with low humidity - spring-like for sure! 

The next map is the GFS weather model showing the air flow (jet stream) at around 18, 000 feet above ground level.   It's easy to see the closed-low pressure system over the Great Lakes, and the major dip in the jet stream.  This pattern will open the door to the cooler Canadian air!

Finally, the 7day forecast is at the bottom with our local forecast.  After a hot weekend, the cold front arrives Monday into early Tuesday with scattered storms (we'll have to watch out for severe storms with strong winds aloft).  The cooler air arrives with highs in the upper 70s and low 80s next Tuesday and Wednesday.  So, don't expect snow in July with this summertime version of the Polar Vortex, and don't expect the cooler air to last very long - it is July. 

 

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