Mesoscale Discussion 1709
   NWS Storm Prediction Center Norman OK
   0845 PM CDT Wed Sep 23 2020

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

   Concerning...Tornado Watch 494...

   Valid 240145Z - 240345Z

   The severe weather threat for Tornado Watch 494 continues.

   SUMMARY...A few strong storms remain possible across the lower
   Mississippi Valley tonight - including the threat for a brief
   tornado or two.

   DISCUSSION...Remnants of Tropical Cyclone Beta continue to shift
   slowly east-northeast across the lower MS Valley. Strongest
   instability remains confined along a corridor across southeast LA
   where surface dew points are in the mid-upper 70s. 00z sounding from
   LIX appeared to sample eastern portions of the most buoyant air mass
   with a surface-based parcel yielding 1100 J/kg. Even so, individual
   convective updrafts have struggled to exhibit appreciable
   strength/longevity, possibly due to stronger low-level shear
   maximized well north of this region across northern MS/AL. East-west
   boundary draped across southern MS remains the primary focus for
   potential supercells over the next few hours.

   ..Darrow.. 09/24/2020

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

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

   LAT...LON   31489201 31889048 30869047 30479201 31489201