Mesoscale Discussion 1708
   NWS Storm Prediction Center Norman OK
   0520 PM CDT Wed Sep 23 2020

   Areas affected...Southeast LA...Southwest MS

   Concerning...Tornado Watch 494...

   Valid 232220Z - 240015Z

   The severe weather threat for Tornado Watch 494 continues.

   SUMMARY...Tornado threat continues across southeast LA and southwest
   MS.

   DISCUSSION...Remnants of Tropical Cyclone Beta are ejecting
   northeast across southern LA this evening. Warm front-like boundary
   has advanced to near the MS/LA border and this wind shift serves as
   the demarcation for surface-based buoyancy and more elevated
   convection farther north. Over the last few hours, several supercell
   structures have evolved near the front, but quickly lift north atop
   somewhat cooler more stable boundary layer. Given these trends, it
   would appear possible that new supercells will evolve across
   southeast LA then lift north where decoupling and some weakening is
   expected. Greatest tornado threat will be as these storms transition
   across the boundary.

   ..Darrow.. 09/23/2020

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

   ATTN...WFO...JAN...LIX...LCH...SHV...

   LAT...LON   31499202 31909047 30899046 30489202 31499202