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Mesoscale Discussion 1260
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   Mesoscale Discussion 1260
   NWS Storm Prediction Center Norman OK
   0516 PM CDT Wed Jun 22 2022

   Areas affected...Central and Southern Pennsylvania...Eastern West
   Virginia...Western Maryland...Central and Eastern Virginia

   Concerning...Severe Thunderstorm Watch 400...401...

   Valid 222216Z - 230015Z

   The severe weather threat for Severe Thunderstorm Watch 400, 401

   SUMMARY...Convective coverage is expected to increase across parts
   of WW 400 and WW 401 over the next couple of hours. In response, the
   potential for wind damage and hail will likely continue.

   DISCUSSION...Latest mosaic radar imagery from Pennsylvania southward
   into Virginia show a few clusters of strong to severe thunderstorms.
   The first is in north-central Pennsylvania and the second in
   southwestern Pennsylvania. These two clusters are located along and
   near an axis of strong instability, with the RAP analyzing MLCAPE in
   the 3000 to 3500 J/kg range. As the two clusters approach each
   other, linear development will be possible. This convection will
   move southeastward into the northwestern part of WW 400. Wind damage
   and hail will be possible with the stronger cells.

   Further south into northern Virginia, a third cluster is ongoing
   near an axis of weak instability. The airmass immediately to the
   south appears to have been undisturbed. This will make a severe
   threat possible early this evening. The RAP has 0-3 km lapse rates
   in the 7.5 to 8.0 C/km range across parts of south-central Virginia,
   suggesting a wind-damage threat will be possible with the stronger
   multicells within the cluster.

   ..Broyles.. 06/22/2022

   ...Please see for graphic product...


   LAT...LON   41467733 41557796 41417839 41067864 40407886 39917926
               39487933 39127923 38247913 37967908 37017891 36757851
               36697825 36717763 36907728 37367692 38057689 39127689
               41077693 41467733 

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