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Mesoscale Discussion 226
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   Mesoscale Discussion 0226
   NWS Storm Prediction Center Norman OK
   0649 PM CDT Thu Mar 18 2021

   Areas affected...southern/southeastern Virginia and much of North

   Concerning...Tornado Watch 42...43...

   Valid 182349Z - 190045Z

   The severe weather threat for Tornado Watch 42, 43 continues.

   SUMMARY...The severe threat continues across WWs 42 and 43.

   DISCUSSION...Based on latest trends, the highest tornado threat will
   continue with convection located along the lingering warm frontal
   zone from near AVC to RIC.  Convection in north-central North
   Carolina has a history of possible tornado damage in the Greensboro
   area, and a continued risk for damaging winds and tornadoes will
   continue with this cluster of storms as it migrates
   east-northeastward along/near the NC/VA border area.  Additional
   convection to the northeast (near Sussex/Surry counties in Virginia)
   and along the surface trough through north-central South Carolina
   will likely benefit from the influence of gradually strengthening
   low-level flow/helicity, but there are concerns that weaker
   instability and nocturnal cooling may result in slightly elevated,
   weakening convection.  Convective trends are being monitored, though
   it appears that the ongoing severe threat will persist for at least
   the next couple of hours (through 02Z).  WWs 42 and 43 both are
   scheduled to expire at 01Z, and local temporal extensions may be
   needed to address any lingering severe threat beyond that time.

   ..Cook.. 03/18/2021

   ...Please see for graphic product...


   LAT...LON   37177836 37567754 37527667 37107612 36777594 36517608
               36257657 36107726 35577799 35147844 34837920 34878007
               34968040 35548010 36297930 37177836 

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