Mesoscale Discussion 0405
   NWS Storm Prediction Center Norman OK
   1239 PM CDT Sun Apr 19 2020

   Areas affected...upper coast of TX...southwest LA

   Concerning...Tornado Watch 120...

   Valid 191739Z - 191845Z

   The severe weather threat for Tornado Watch 120 continues.

   SUMMARY...Convective trends towards a supercellular convective mode
   are increasing as 700mb flow intensifies this afternoon.  Large to
   very large hail is possible with the mature supercells.  A tornado
   risk will probably accompany the stronger/more persistent low-level
   mesocyclones.

   DISCUSSION...Radar imagery trends over the past hour are showing
   warm sector development of storms acquiring some intermittent
   rotation north of the greater Houston area.  A robust supercell has
   also recently developed to the north of Matagorda Bay moving towards
   the south side of the Houston metro during the next few hours.  The
   boundary layer across the upper coast of TX continues to destabilize
   as temperatures warm through the 70s and into the lower 80s near
   Galveston Bay.  

   As storms continue to gradually intensify during the early
   afternoon, coincident with the aforementioned strengthening flow in
   the low to mid levels, the risk for a tornado and large to very
   large hail will correspondingly increase with the strongest storms. 
   Short-term model guidance is suggesting at least some severe
   activity will move across the Galveston Bay vicinity and into
   southwest LA and the near-shore waters during the next 2-4 hours.

   ..Smith.. 04/19/2020

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

   ATTN...WFO...LCH...SHV...HGX...

   LAT...LON   29209642 30889521 31379385 31239319 30769295 30039322
               28549565 29209642