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Thursday, July 27, 2023 Severe Weather Potential


weatherwiz
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1 minute ago, Sey-Mour Snow said:

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   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 553
   NWS Storm Prediction Center Norman OK
   1245 PM EDT Thu Jul 27 2023

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Connecticut
     Massachusetts
     Southern Maine
     Southern New Hampshire
     Southeast New York
     Northeast Pennsylvania
     Rhode Island
     Southern Vermont
     Coastal Waters

   * Effective this Thursday afternoon and evening from 1245 PM
     until 800 PM EDT.

   * Primary threats include...
     Scattered damaging winds likely with isolated significant gusts
       to 75 mph possible
     Isolated large hail events to 1 inch in diameter possible
     A tornado or two possible

   SUMMARY...Thunderstorms will intensify this afternoon along a cold
   front and spread eastward across the watch area.  Damaging wind
   gusts will be possible with the strongest cells through the
   afternoon.  A tornado or two cannot be ruled out.

   The severe thunderstorm watch area is approximately along and 90
   statute miles east and west of a line from 5 miles west northwest of
   Augusta ME to 30 miles south of Poughkeepsie NY. For a complete
   depiction of the watch see the associated watch outline update
   (WOUS64 KWNS WOU3).
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The wind really picked up here in Central MA.  If clouds could get a speeding ticket, today would fill the end of month quotas.

I wouldn't want to be under any weakened trees with how saturated the ground is, even with the non-thunderstorm winds out there right now.

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5 minutes ago, weatherwiz said:

We may be able to avoid that since the overall forcing isn't terribly strong. 

3000-3500 SBCAPE, 1500-2000 MLCAPE in CT per mesoanalysis. Should be primed for some good stuff today if you're right. Let's destabilize more. :weenie: 

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1 minute ago, WxWatcher007 said:

3000-3500 SBCAPE, 1500-2000 MLCAPE in CT per mesoanalysis. Should be primed for some good stuff today if you're right. Let's destabilize more. :weenie: 

My one worry for CT is the better shear is lifting north of the state. The instability is certainly great and dynamics are still certainly good, but with the poor lapse rates I would like to see 0-6km shear more in the 40 knot range and bulk shear 40-45 knots. Those values are certainly enough for storm organization, but a bit more would help with stronger updrafts 

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1 minute ago, weatherwiz said:

My one worry for CT is the better shear is lifting north of the state. The instability is certainly great and dynamics are still certainly good, but with the poor lapse rates I would like to see 0-6km shear more in the 40 knot range and bulk shear 40-45 knots. Those values are certainly enough for storm organization, but a bit more would help with stronger updrafts 

Agree, timing just seems a little off. We're kind of trying to catch a falling knife. That said, this is the best look we've had for severe all summer so we just roll with it.  

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As has been pointed out by Wiz, greatest severe potential likely runs across eastern / northeastern Mass; at least in terms of tornado potential.   While the SPC meso analysis tornado paraments are far from perfect, they do act as a good guide as to what areas to focus on when storms are moving into & across the region.  Almost all of the of the tornado parameters they are generating now continue to bull's eye eastern & northeastern Mass. generate

 

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