Mesoscale Discussion 0573
   NWS Storm Prediction Center Norman OK
   0212 PM CDT Tue May 12 2020

   Areas affected...portions of central TX

   Concerning...Tornado Watch 178...

   Valid 121912Z - 122045Z

   The severe weather threat for Tornado Watch 178 continues.

   SUMMARY...A couple of strong to severe storms could still pose a
   threat for a tornado and/or strong wind gusts over the next couple
   of hours.

   DISCUSSION...Scattered thunderstorms continue to show periodic
   supercell characteristics and weak low-level rotation across eastern
   portions of WW 178. While instability has increased across the area
   this afternoon, trends in low-level shear (effective and SRH) over
   the past three hours have generally decreased, leading to a messier
   conglomeration of storms. Surface analysis also has shown there is
   likely some detrimental impact from storms training and/or only
   slowly shifting eastward. A meso-beta area of stronger pressure
   rises were noted in conjunction with a modest cold pool (surface
   temps mid 60s-70 F, compared to upper 70s to mid 80s in surrounding
   areas). Some more intense cells may develop on the southern fringes
   of this rain-cooled air along a strong temperature gradient and
   where MLCAPE values have increased to 1000-1500 J/kg. While shear
   has weakened, it remains adequate for at least brief supercell
   structures and a severe storm can not be ruled out near the edges of
   WW 178. However, a new downstream watch is not expected at this
   time.

   ..Leitman.. 05/12/2020

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

   ATTN...WFO...HGX...FWD...EWX...SJT...

   LAT...LON   29979905 30339908 30549893 30809854 30919761 30899696
               30709655 30389636 30039641 29619656 29229705 28949755
               28849792 28839827 29009854 29379884 29979905