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Mesoscale Discussion 1054
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   Mesoscale Discussion 1054
   NWS Storm Prediction Center Norman OK
   0515 PM CDT Mon Jun 21 2021

   Areas affected...Portions of the Mid Atlantic and East Coast

   Concerning...Severe Thunderstorm Watch 302...304...

   Valid 212215Z - 212315Z

   The severe weather threat for Severe Thunderstorm Watch 302, 304

   SUMMARY...A line of thunderstorms with a history of damaging wind
   gusts will track east over the next couple of hours. A continued
   threat for damaging gusts appears likely before storms move offshore
   around 00z.

   DISCUSSION...2215Z radar imagery showed a line of strong/severe
   thunderstorms and short bowing segments across portions of
   northeastern VA, MD, and southern PA. Several reports of tree and
   property damage have been received with this convective line over
   the last few hours. Recent lightning and satellite trends suggests
   some weakening of the line is occurring given lower flash rates and
   warmer cloud tops. This is likely the result of interference from
   the cooler maritime airmass near the Chesapeake Bay. However, SPC
   mesoanalysis shows a broad area of locally greater buoyancy
   (2000-2500 J/kg of MLCAPE) exists to the east across DE and southern
   NJ. While some weakening of the ongoing line will likely continue,
   damaging wind gusts from strong outflow winds will remain a threat.
   Some resurgence may occur after storms cross into more favorable
   thermodynamic profile east of the bay across WW302 and southern
   portions of 304. This threat will continue before storms move
   offshore around 00z.

   ..Lyons.. 06/21/2021

   ...Please see for graphic product...


   LAT...LON   38607464 38567508 38667644 38897726 39617687 40337649
               40427538 40407437 40227367 39587388 39137419 38607464 

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