Mesoscale Discussion 1259
   NWS Storm Prediction Center Norman OK
   0441 PM CDT Sun Jul 11 2021

   Areas affected...Central Pennsylvania

   Concerning...Severe Thunderstorm Watch 372...

   Valid 112141Z - 112315Z

   The severe weather threat for Severe Thunderstorm Watch 372
   continues.

   SUMMARY...Damaging winds remain the primary threat in central
   Pennsylvania. A conditional tornado threat also exists with storms
   that favorably interact with the warm front.

   DISCUSSION...A few thunderstorms within the broken line along the
   western edge of the Allegheny Mountains have exhibited some
   supercell structure. A few isolated cells have also developed within
   the warm sector in central Pennsylvania. While the primary threat
   with these storms will likely remain damaging wind gusts, there
   remains a conditional threat for a tornado with storms that interact
   with the warm front. The KCCX VWP shows over 200 m2/s2 0-1 km SRH.
   The greatest tornado potential would exist with the discrete storms
   prior to them crossing the cold front or being overtaken by the
   broken line to the west. With water vapor imagery showing shortwave
   ridging in the area, there is uncertainty as to how much the
   discrete, warm sector storms will become. If they do mature, the
   process will be relatively slow given poor lapse rates aloft.

   ..Wendt.. 07/11/2021

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

   ATTN...WFO...BGM...CTP...LWX...PBZ...

   LAT...LON   39837963 40547931 41217857 41527757 41567650 41417640
               40657677 40107758 39687894 39837963