Mesoscale Discussion 0454
   NWS Storm Prediction Center Norman OK
   1116 PM CDT Wed Apr 22 2020

   Areas affected...Central LA...Southwest MS

   Concerning...Tornado Watch 135...137...

   Valid 230416Z - 230545Z

   The severe weather threat for Tornado Watch 135, 137 continues.

   SUMMARY...Environment will remain supportive of supercells capable
   of all severe hazards, including tornadoes, for the next several
   hours. A new Tornado Watch will likely be needed too cover this
   continued threat across central LA.

   DISCUSSION...Low-level moisture continues to advect northward into
   central LA and southwest MS. Current surface observations show 70
   deg F dewpoints into central LA and as far north as HZR in
   northwestern southeast LA. Despite some modest nocturnal cooling,
   moderate instability persists within this moist air mass with
   several supercells currently ongoing. Strong low-level and
   deep-layer vertical is also in place. KPOE VAD recently sampled 50
   kt around 1 km amidst strong low-level veering and 70 kt of 0-6 km
   bulk shear. 

   Pair of supercells in central LA continue to show severe potential.
   Newer development across southwest LA has also intensified quickly
   and will likely pose a downstream severe threat. Given the current
   radar trends and the persistence of favorable environment, the
   tornado threat will likely extend past the 05Z expiration time of
   Tornado Watch 135. A new Tornado Watch will likely be needed across
   portions of central LA to cover this threat.

   ..Mosier.. 04/23/2020

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

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

   LAT...LON   31319331 31819303 32129260 32239189 32009119 31579083
               30709101 30269160 30109371 31319331