Mesoscale Discussion 0455
   NWS Storm Prediction Center Norman OK
   0228 AM CDT Thu Apr 23 2020

   Areas affected...southern and eastern LA into southern
   MS...southwest AL and the western FL Panhandle

   Concerning...Tornado Watch 137...138...

   Valid 230728Z - 230900Z

   The severe weather threat for Tornado Watch 137, 138 continues.

   SUMMARY...All severe hazards remain possible across WW 137 and 138.
   A downstream tornado watch will likely be needed in the next couple
   of hours across southeast MS, southern AL and the western FL
   Panhandle.

   DISCUSSION...Strong to severe thunderstorms continue as of 07z
   across WW 137 and 138, from southern/central MS along/just north of
   a warm front, as well as southwestward ahead of a cold front, from
   southwest MS into southern LA. The surface warm front extends across
   southern into southeast MS to near Mobile Bay. These storms are
   tracking toward the east/northeast at around 40-45 kt, which should
   bring them to the eastern portions of the WW 137 by around 09-10z.
   Additional convection has been developing more recently ahead of the
   main line of storms near Pike County, MS. If this continues, a
   severe threat may spread outside of the watch area and into portions
   of southeast MS and southern AL sooner rather than later.

   The downstream airmass across southeast MS into southern AL should
   continue to improve with time through the early morning hours.
   Boundary-layer dewpoints will continue to climb through the 60s F as
   a 40+ kt south/southwesterly low-level jet overspreads the region.
   Convection may outpace best instability, but intense shear should
   compensate for more modest instability further east. Regional VWP
   data continues to show large, curved low-level hodographs
   lengthening above 3km. As such, supercells capable of all severe
   hazards will remain possible across WW 137 and 138, and downstream
   across parts of southeast MS into southern AL and the western FL
   Panhandle through the morning hours.

   ..Leitman.. 04/23/2020

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

   ATTN...WFO...BMX...MOB...JAN...LIX...LCH...

   LAT...LON   30009254 30139285 30289306 30689272 31269201 32129121
               32269073 32238913 32188856 32198826 32018750 31818708
               31488678 30798680 30248725 30028894 29949134 30009254