Mesoscale Discussion 1137
   NWS Storm Prediction Center Norman OK
   0348 PM CDT Wed Jun 30 2021

   Areas affected...Portions of far northeastern PA into
   central/southern NY...MA...and northern CT

   Concerning...Severe Thunderstorm Watch 326...329...

   Valid 302048Z - 302215Z

   The severe weather threat for Severe Thunderstorm Watch 326, 329
   continues.

   SUMMARY...The threat for scattered damaging winds and isolated
   severe hail should focus across parts of central/southern New York
   into Massachusetts and vicinity over the next couple of hours.

   DISCUSSION...Two loosely organized clusters of storms are present
   this afternoon, one over far northeastern PA into central NY, and
   the other over western into central MA. Strong boundary-layer
   heating has occurred ahead of these storms, and rather steep
   low-level lapse rates around 8-9 C/km have developed downstream.
   This region remains on the southern fringe of the stronger mid-level
   westerly flow. Still, recent VWPs from KBGM and KENX show modestly
   strengthening westerly winds with height through mid levels, and
   around 30-40 kt of deep-layer shear remain present. Multicell
   clusters will likely continue to pose a threat for scattered
   damaging wind gusts. Some marginally severe hail may also occur,
   particularly with any embedded supercell within the cluster in
   western/central MA. It appears the greatest overall severe threat
   may focus across MA in the short term, where the best overlap of
   steep low-level lapse rates, moderate instability, and sufficient
   deep-layer shear overlap.

   ..Gleason.. 06/30/2021

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

   ATTN...WFO...BOX...ALY...BGM...

   LAT...LON   41737614 42327567 42717444 42717327 42687188 42687087
               42197085 42027180 41857346 41387581 41737614