Mesoscale Discussion 1593
   NWS Storm Prediction Center Norman OK
   1110 AM CDT Thu Aug 27 2020

   Areas affected...southeast LA...southern into central MS

   Concerning...Tornado Watch 454...

   Valid 271610Z - 271815Z

   The severe weather threat for Tornado Watch 454 continues.

   SUMMARY...The tornado risk will primarily be confined to storms
   located in a spiral band to the east/southeast of Laura through 1pm
   CDT.

   DISCUSSION...Radar mosaic shows an extensive rain shield across the
   northern half of Laura with scattered convection located in the
   southeastern quadrant of the larger-scale system.  A spiral band
   with embedded deeper convection is elongated from near Lake
   Pontchartrain into southern MS as of 11am CDT.  As Laura continues
   to move to the north over the next few hours, this bands will
   likewise translate north and include parts of central MS.  KDGX VAD
   shows an enlarged low-level hodograph with around 250 m2/s2 0-1km
   SRH when accounting for observed storm motions (considerably less
   than the default Bunkers Internal Dynamic method's estimate). 
   Surface conditions show lower 80s temperatures with upper 70s F
   dewpoints---yielding marginal buoyancy.  Given the shear/buoyancy of
   the mesoscale environment, transient low-level rotation will likely
   continue with the stronger updrafts through the early afternoon.  A
   brief tornado or two may result.

   ..Smith.. 08/27/2020

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

   ATTN...WFO...JAN...LIX...

   LAT...LON   30129021 31949047 32189017 32058972 30328976 30129021