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Mesoscale Discussion 1142
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   Mesoscale Discussion 1142
   NWS Storm Prediction Center Norman OK
   0725 PM CDT Fri Jun 23 2017

   Areas affected...West Virginia...Maryland...Pennsylvania...New
   Jersey...Delaware

   Concerning...Severe Thunderstorm Watch 366...369...

   Valid 240025Z - 240130Z

   The severe weather threat for Severe Thunderstorm Watch 366, 369
   continues.

   SUMMARY...A severe threat is ongoing across parts of the
   Mid-Atlantic early this evening. Damaging wind gusts or a brief
   tornado will be possible but the severe threat is expected to
   gradually diminish over the next couple of hours. Additional Weather
   Watch issuance is not expected.

   DISCUSSION...Radar imagery shows the remnants of Cindy across
   central Kentucky with a band of convection extending to the
   east-northeast across northern West Virginia, southern Pennsylvania
   into northern New Jersey. Surface dewpoints along this corridor are
   in the upper 60s and lower 70s F with the RAP showing moderate
   instability mainly in the eastern part of the MCD area. This is
   confirmed by the 00Z sounding at Washington DC which shows SBCAPE
   near 1500 J/kg. This sounding also shows 0-6 km shear near 50 kt
   along with 0-3 km storm relative helicity of 250 m2/s2. Low-level
   shear is likely stronger westward into the northern part of West
   Virginia. This is where a brief tornado will be possible over the
   next hour or so with small discrete cells that rotate. A few strong
   wind gusts will also be possible especially southeastern
   Pennsylvania where a short line segment is ongoing. The severe
   threat appears to be minimal and the watches will be allowed to
   expire at 02Z. The situation will continue to be monitored in the
   case that an isolated severe threat ramps up later this evening.

   ..Broyles/Hart.. 06/24/2017

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...OKX...PHI...CTP...LWX...PBZ...RLX...

   LAT...LON   39237438 39007648 38887973 38988038 39448032 39667953
               40777529 40597376 39237438 

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