Monday, June 21, 2021

UPDATE 1 p.m. Monday: Severe Storm Risk In Vermont, Surrounding Areas Rises

An unusual enhanced risk of severe storms over our
neck of the woods. It's rather rate to have the risk
level that high. Strong, damaging winds are the biggest threat
but still can't rule out a brief twister. 
 A severe thunderstorm watch is in effect for all of Vermont as the risk of severe storms rapidly ramps up over us this afternoon.  

The Storm Prediction Center updated the risk category for us from "Slight," which is second out of five risk categories, to "Enhanced," or level three out of five. It's a bit unusual to have the "Enhanced" category in effect up here in Vermont. 

Strong winds a few thousand feet overhead, with winds changing direction and speed with height, and instability increasing with sun and very humid air.

As forecast this morning, a line of strong storms is expected to form in New York today and sweep eastward. A little ahead of this line, supercells may develop in northern New York, northern Vermont and especially southern Quebec

This ups the ante, with strong straight line winds still the biggest threat from today's storms. The presence of supercells also gives us some risk of hail and even a tornado or two.  NOAA's Storm Prediction Center acknowledges the tornado risk over the North Country. The highest risk is right along the International Border, and even more so up in southern Quebec

That's now to say there will be lots of tornadoes or big ones. But there is still a low, but real risk of a brief twister,especially in northern New York and northern Vermont this afternoon.

The bulk of the storms are forecast to pop up any minute now in northern New York. Actually, as I write this at 1:10 p.m. a couple rapidly developing storms have formed in New York's St. Lawrence Valley. The storms will make it to the Champlain Valley in the 3 to 6 p.m. time range, and further into central and eastern Vermont from 5 to 8 p.m. 

This is by our standards a fairly high end severe weather risk.  Not everyone in Vermont will have a severe storm, of course. But this is more than enough to keep you on your toes.  

Make sure you have access to broadcast severe storm warnings. Power up your devices now in case of electrical failures later. 

If you do get a warning, make sure and get inside a sturdy building and away from windows. These storms are strong enough so that if you're out in your car and you find yourself in a severe thunderstorm or god forbid a tornado warning, it's probably best to find a business in a strong building and wait it out there. 

Once it's safe to do so, report severe storms and/or damage to the National Weather Service in Burlington.  They'll want to know. You can call 'em, but even better, reach out to them on Twitter at @NWSBurlington.

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