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Mesoscale Discussion 215
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   Mesoscale Discussion 0215
   NWS Storm Prediction Center Norman OK
   0816 PM CDT Tue Apr 03 2018

   Areas affected...Parts of the Cumberland/Allegheny Plateau region

   Concerning...Severe Thunderstorm Watch 30...32...

   Valid 040116Z - 040245Z

   The severe weather threat for Severe Thunderstorm Watch 30, 32

   SUMMARY...Thunderstorms will overspread the region through 11-2 AM
   EDT, accompanied by at least some risk for potentially damaging wind
   gusts.  Another severe weather watch probably will be issued.

   DISCUSSION...Some increase in low-level moisture (surface dew points
   perhaps rising from the lower through mid 50s) is possible on
   south/southwesterly low-level flow ahead of pre-frontal thunderstorm
   activity approaching the region.  This should contribute to the
   maintenance of weak instability, despite the onset of diurnal
   boundary layer cooling.  This may be enough to maintain the vigorous
   ongoing storms which appear likely to begin spreading east of
   tornado watch 31 and severe thunderstorm watch 32 during the 02-03Z
   time frame.  In the presence of strong deep layer mean flow,
   including 50+ kt at 850 mb, storms will continue to pose a risk for
   at least localized damaging wind gusts until they weaken near the
   western slopes of the Appalachians later tonight.

   ..Kerr.. 04/04/2018

   ...Please see for graphic product...


   LAT...LON   38828244 38498080 37358083 35638396 34878578 35498672
               37188453 38448315 38828244 

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