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Mesoscale Discussion 1307
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MD 1307 graphic

   Mesoscale Discussion 1307
   NWS Storm Prediction Center Norman OK
   0523 PM CDT Thu Jul 13 2017

   Areas affected...southeast Pennsylvania through central and southern
   New jersy

   Concerning...Severe Thunderstorm Watch 412...413...

   Valid 132223Z - 140000Z

   The severe weather threat for Severe Thunderstorm Watch 412, 413
   continues.

   SUMMARY...Some threat for mainly a couple of instances of damaging
   wind will persist over remainder of WW 413 from southeast PA through
   central and southern NJ through about 00Z followed by a rapid
   diminishing trend. Severe threat in WW 412 is ending.

   DISCUSSION...Primary severe threat next hour or two will persist
   with storms training southeast along a convective outflow boundary
   from southeast PA through the southern half of NJ. Moderate
   instability with around 2000 J/kg MLCAPE and unidirectional westerly
   wind profiles with 30-35 kt effective bulk shear will support mostly
   multicells with bowing segments as well as a few storms with weak
   mid-level updraft rotation. A few instances of strong to damaging
   wind gusts remain the primary threat through about 00Z, but a
   stabilizing boundary layer should contribute to a rapid diminishing
   trend prior to WW 413 expiration time of 01Z.

   ..Dial.. 07/13/2017

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

   ATTN...WFO...PHI...CTP...

   LAT...LON   40267607 40107429 39617418 39557458 39677558 39917635
               40267607 

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