Mesoscale Discussion 0891
   NWS Storm Prediction Center Norman OK
   0711 PM CDT Mon May 23 2022

   Areas affected...Northwest South Carolina into far southwest North
   Carolina

   Concerning...Tornado Watch 263...

   Valid 240011Z - 240115Z

   The severe weather threat for Tornado Watch 263 continues.

   SUMMARY...The tornado potential will likely persist through 01 UTC
   along the northern North Carolina/South Carolina border.

   DISCUSSION...Thunderstorms continue to develop in the vicinity of
   the post-tropical low over the western Carolinas. At least one
   low-topped supercell has produced a tornado over the past hour
   despite the early onset of diurnal cooling. A couple of other storms
   within WW 263 have also shown signs of persistent mesocyclones over
   the past 30 minutes, which suggests that the potential for a tornado
   or two continues for the near term. Regional VWP observations
   continue to show strong low-level helicity (upwards of 150-250 m2/s2
   of 0-1 km SRH), and 1-2 F dewpoint depressions will limit the degree
   of diurnal cooling over the next hour and maintain sufficient
   instability for low-topped convection. The tornado threat will begin
   to diminish more substantially as the surface low continues to move
   north into a more stable air mass and diurnal cooling fosters
   growing inhibition, but this will likely not occur until after 01
   UTC.

   ..Moore.. 05/24/2022

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

   ATTN...WFO...CAE...GSP...

   LAT...LON   34688207 35018213 35538185 35728145 35628096 35308079
               34948107 34688122 34588140 34518163 34688207