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Mesoscale Discussion 1178
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   Mesoscale Discussion 1178
   NWS Storm Prediction Center Norman OK
   0606 PM CDT Fri Jul 27 2018

   Areas affected...Portions of southern New England southward toward
   the Mid-Atlantic

   Concerning...Severe Thunderstorm Watch 312...313...314...

   Valid 272306Z - 280000Z

   The severe weather threat for Severe Thunderstorm Watch 312, 313,
   314 continues.

   SUMMARY...The severe threat persists across remaining portions of
   WWs 312, 313, and 314.

   DISCUSSION...The severe threat continues along and ahead of a broken
   line of convection extending from southern New Hampshire
   southwestward to southeastern Pennsylvania and central Virginia. 
   Occasional reports of wind/tree damage and 1-1.5 inch hailstones
   have been reported with the strongest convection over the past few
   hours with these storms.  This threat should continue given the
   moderately unstable (2000-2500 J/kg) and moderately sheared (35-45
   kt) pre-convective airmass.  Over time (i.e., the next couple of
   hours) these storms may reach eastern portions of Massachusetts,
   Connecticut, and Long Island (New York) and pose a severe threat
   before the scheduled expiration times of each watch (02Z).  If this
   scenario materializes, spatial extensions of the Watches
   (particularly WW 312) may be needed.

   Continued maturation of cold pools west of the ongoing storms will
   result in a decreased severe threat with time.  Ongoing WWs in these
   areas may be cancelled early.

   ..Cook.. 07/27/2018

   ...Please see for graphic product...


   LAT...LON   43697335 43667296 43327221 43347147 43767086 43967020
               43857006 43137060 42457093 42087099 41667137 41397177
               41277254 40987312 40707342 40607352 39247457 38567498
               37917530 37427581 37077613 36697681 36677739 36887785
               37577875 38067881 38457820 39057729 39827676 40647597
               41367498 42017407 42767387 43327387 43697335 

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