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Mesoscale Discussion 1333
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MD 1333 graphic

   Mesoscale Discussion 1333
   NWS Storm Prediction Center Norman OK
   0558 PM CDT Mon Jul 17 2017

   Areas affected...Portions of northeastern PA...eastern NY...northern
   NJ...CT/MA/VT/NH...and western ME

   Concerning...Severe Thunderstorm Watch 417...

   Valid 172258Z - 180000Z

   The severe weather threat for Severe Thunderstorm Watch 417

   SUMMARY...An isolated severe hail/wind threat should continue in and
   downstream of remaining valid portions of WW 417 for another hour or
   two before diminishing. Additional WW issuance is not anticipated.

   DISCUSSION...Ongoing clusters of convection across New England
   associated with an upper-level trough have produced sporadic
   strong/gusty winds with tree damage and marginally severe hail as
   they moved across WW 417 and vicinity this afternoon and early
   evening. The airmass downstream of these thunderstorms into eastern
   New England is only weakly unstable (MLCAPE generally 500 J/kg or
   less), and convective inhibition also increases with eastward
   extent. While effective bulk shear values around 30 kt may continue
   to support some organization of several ongoing clusters for another
   hour or two, the loss of diurnal heating will lead to further
   weakening of already marginal instability. The overall severe threat
   will therefore continue to diminish this evening, and additional
   watch issuance downstream of WW 417 is not expected.

   ..Gleason.. 07/17/2017

   ...Please see for graphic product...


   LAT...LON   40907428 40527492 40997606 41417622 42667468 43047386
               43407276 43997191 45227066 45797033 45957006 45826961
               44447039 42637229 41707329 40907428 

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