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Mesoscale Discussion 767
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   Mesoscale Discussion 0767
   NWS Storm Prediction Center Norman OK
   0633 PM CDT Thu May 18 2017

   Areas affected...Far northeast PA...central NY...VT...western
   NH...western MA

   Concerning...Severe Thunderstorm Watch 237...

   Valid 182333Z - 190100Z

   The severe weather threat for Severe Thunderstorm Watch 237

   SUMMARY...Broken line of storms is expected to gradually weaken over
   the next few hours and a downstream watch is not currently
   anticipated. Isolated damaging wind gusts remain possible.

   DISCUSSION...Broken line of strong to occasionally severe
   thunderstorms currently extends from central VT southwestward into
   north-central PA. Enhanced unidirectional flow aloft is supporting
   easterly motion at approximately 40 kt. Most of this activity has
   shown fairly persistent updraft strength over the past hour or so
   but the expectation is for a general weakening trend to begin soon
   as the storms encounter a more hostile thermodynamic environment
   downstream across southern VT, western MA, and the Hudson Valley
   region of NY. As a result, a downstream watch is not anticipated.
   Even so, steep low-level lapse rates fostered by record-breaking
   temperatures across the region will still support a localized
   damaging wind threat for the next few hours.

   ..Mosier.. 05/18/2017

   ...Please see for graphic product...


   LAT...LON   43727405 44477286 44747197 44657155 43967170 42777238
               42277334 41807486 41707694 42417672 43727405 

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