Thursday, July 9, 2020

Storm Damage Widespread In Vermont; Now The Heat

Severe warned storm on approach to Sheldon, Vermont Wednesday.
The storm toppled trees and power lines in this and other
Vermont towns. 
We had the wildest storm outbreak of the season on Wednesday here in Vermont, with some welcome rains, but also some pretty substantial damage from severe weather.

Most of the damage involved trees and power lines, but siding was damaged on a house in Essex, there were reports of structural damage around Danby, and sidiing damaged by hail the size of ping pong balls in Fair Haven.

The pattern of damage in New England almost exactly matched the area that was under a severe thunderstorm warning.  The warning, and areas of damage were almost exclusively across Vermont, New Hampshire and western Maine.

In northern Vermont, the main swath of damage seemed to go on a long track starting in Alburgh and Swanton, continuing to through Sheldon an into eastern Franklin County around Bakersfield and Fairfield. It continued on through eastern Chittenden County,especailly around Essex, Jericho and Bolton, then into the Fayston/Moretown/Waitsfield area in central Vermont.

At least the storms brought some welcome rain.  I was on the edge of the damaging swath that went from Swanton through Sheldon and on into the Bakersfield area.  There was no wind damage on my St. Albans property, but my rain gauge collected a healthy 1.3 inches of rain in less than an hour. I noticed a fair amount of street flooding in downtown St. Albans.

CITIZEN SCIENTISTS HELP

Another view of the severe  thunderstorm in Sheldon, Vermont
on Wednesday 
By the way, the damage reports are a great example of how citizen scientists can help the National Weather Service improve forecasts.

Yesteday was a great example.  NWS meteorologist can't be all over the state, observing ongoing thunderstorms.  

They looked at radar trends with these storms, and issued severe thunderstorm warnings when radar images they were looking at indicated danger in these storms.

If you report damage from a storm to the National Weather Service, it helps verify their forecasts and  improves warnings.

For instance, if a bunch of damage reports come in from an area under a servere thunderstorm warning, that helps meteorologists understand there really is danger if they see similar radar trends in the future.

On the other hand, if a certain radar pattern seems to indicate dangerous storms, but that particular pattern never seems to yield real-life damage reports, then maybe that radar pattern doesn't really reflect threatenin weather.

There are a few general ground rules when reporting storms. First of all, do it only when it's safe. Don't go outside to measure the size of the downed tree if the wind is still blowing a million miles an hour and the hail falling is the size of canned hams, as David Letterman would put it.

When reporting the storm damage, be specific. To the best of your ability, tell the National Weather Service exactly what happened and where, and what time. If you have GPS coordinates great, report those, but most of us don't have that ability.

So report something like this:  "Large tree down on wires at 25 Main Street, Funkytown, Vermont, power is out. Occured at 4:15 p.m. ."  Sending along photos helps.  Don't bother reporting minor damage, like a three inch long dead twig coming off the old maple.

Definitely have a "just the facts ma'am" attitude when reporitng.  Don't complain that the power outage interrupted the season finale of "Real Housewives of Enosburg Falls"

It's probably wise not to telephone the National Weather Service office when they're busy issuing warnings -- too distracting. Call though, if it's an extreme issue, like a tornado touchdown happening in front of you.

I tend to tweet my reports to the National Weather Service office in South Burlington. It's @NWSBurlington.   The more citizen reports of legitimate storm danage reported to the NWS the better.

Reporting on storms isn't limited to summer thunderstorms. Also report wind damage, snow, ice, flooding during any season.

ON TO THE FORECAST

As we have been advertising, it's going to be a really hot, oppressive couple of days. Yesterday's storms freshened the air last night, but that's over. Expect high humidity and temeratures in the low 90s both today and Friday.   Tonight will be stuffy for sure.

The weather people are still watching a disturbance that's now near the coast of North Carolina. There's a good chance it will turn into Tropical Storm or Subtropical Storm Fay.

Wannabe Fay will track northward just off the East Coast, but the devil is in the details.  We know it will affect southern and coastal New England, but that's about it.

It leads to what the National Weather Service in South Burlington calls a tricky weekend forecast for Vermont. Some computer models take Wannabe Fay just off the east coast of New England, or over Providence and Boston.

A few computer models take it inland in New Jersey, then up New York's Hudson River Valley and through Vermont. That path still seems rather unlikely, but would give us a good, benefitical soaking rain.

Remember, even if Wannabe Fay develops into a tropical storm, it won't be a powerhouse in terms of wind  Heavy rain is a threat, not wind.

Meanwhile, another weather disturbance will be approaching from the west. That will dance with either Wannabe Fay or the deep tropical moisture it brings north into New England.

How this plays out is anybody's guess, but at least it gives us a high chance of showers over the weekend.  We certainly could use more rain, even after yesterday's storms.  If the rain is locally torrential, though, there could be a couple spot instances of flash flooding.

Although clouds and showers will keep temperatures below 90 degrees over the weekend, the humidity will still be awful.  Remember, Wannabe Fay is bringing deep tropical air north into New England.

On top of that, once all the showers clear our early next week, we're still definitely at risk for another hot, dry spell late next week.

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