Mesoscale Discussion 1586
   NWS Storm Prediction Center Norman OK
   0747 PM CDT Wed Aug 26 2020

   Areas affected...much of Louisiana...far eastern Texas and southwest
   Mississippi

   Concerning...Tornado Watch 452...

   Valid 270047Z - 270245Z

   The severe weather threat for Tornado Watch 452 continues.

   SUMMARY...Shear will continue to increase with the approach of
   Hurricane Laura, with sporadic tornadoes possible within developing
   bands of storms through tonight. The greatest tornado risk will
   exist within the northeastern quadrant of the storm, primarily over
   Louisiana. As such, a new tornado watch will be needed.

   DISCUSSION...Objective analysis shows gradually increasing low-level
   shear over the area, with 0-1 SRH of 300-400 m2/s2 across southwest
   Louisiana early this evening. Shear will increase overnight as
   Hurricane Laura continues northward toward coastal Louisiana and
   Texas. Low-level moisture quality will also increase near and east
   of the center track, with dewpoints at or above 77 F. This should
   result in favorable SBCAPE for supercells embedded within the rain
   bands, with 0-1 SRH over 500 m2/s2 aiding tornado potential.

   ..Jewell.. 08/27/2020

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

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

   LAT...LON   29419344 29549419 29929446 30899443 31719432 32069404
               32189368 32239336 32149282 31959231 30629110 30089079
               29529069 29089084 28979111 28999167 29419344