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Mesoscale Discussion 932
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   Mesoscale Discussion 0932
   NWS Storm Prediction Center Norman OK
   0634 PM CDT Wed May 31 2017

   Areas affected...Northeast PA...Southeast
   NY...CT...MA...NH...Western ME

   Concerning...Severe Thunderstorm Watch 300...

   Valid 312334Z - 010100Z

   The severe weather threat for Severe Thunderstorm Watch 300

   SUMMARY...The damaging wind and isolated large hail threat continues
   in and near WW 300. Some severe threat may extend downstream of the
   watch, but should diminish with eastward extent.

   DISCUSSION...At 2330Z, a loosely organized QLCS is ongoing from
   southeast NY northeastward into western ME. In addition, a discrete
   supercell is ongoing just ahead of the line near Poughkeepsie, NY.
   The strongest instability is located across southeast NY into
   western CT/MA, with recent mesoanalyses indicating SBCAPE of
   500-1250 J/kg. Effective shear of 35-45 kts will continue to support
   some organized structures in the short term. The primary threat is
   expected to be damaging wind given the primary linear mode, but the
   supercell across southeast NY will pose some tornado threat as long
   as it remains discrete, with locally backed southeasterly flow
   supporting a modest amount of low-level shear/helicity. 

   As the QLCS advances eastward, it will eventually encounter a cooler
   and more stable airmass. This will occur first across portions of
   southern ME, where a marginal damaging wind risk may exist
   downstream of WW 300, but should diminish with eastward extent.
   Further south, there is some potential for a severe threat to extend
   east of the watch and local extensions may eventually be needed. 

   Back to the southwest across northeast PA, a separate line segment
   has recently intensified. This will pose some damaging wind risk as
   it advances eastward into the southwest portion of WW 300, though it
   will encounter an increasingly worked-over environment from earlier

   Finally, some severe threat may extend a small distance south of WW
   300 across southeast NY/southwest CT, but the spatiotemporal extent
   of this threat appears too limited for new watch issuance.

   ..Dean.. 05/31/2017

   ...Please see for graphic product...


   LAT...LON   41987641 42217471 42657250 43597210 44827073 45387039
               45326968 44486995 43187076 42287139 42067183 41517239
               41427313 41347384 41457524 41737636 41987641 

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