Mesoscale Discussion 1566
   NWS Storm Prediction Center Norman OK
   0312 AM CDT Tue Aug 25 2020

   Areas affected...portions of southeast LA and adjacent southern MS

   Concerning...Severe potential...Watch unlikely 

   Valid 250812Z - 251015Z

   Probability of Watch Issuance...20 percent

   SUMMARY...A brief, weak tornado and/or waterspout is possible near
   the immediate coast. However, the overall threat is expected to
   remain low, and diminish with time through the morning hours.

   DISCUSSION...Occasional low level rotation has been noted in cells
   tracing northwest from near the southeast LA/MS coasts toward the
   Slidell LA vicinity. While low level hodographs initially appear
   enlarged, when adjusted for storm motion, SRH values become somewhat
   lower, with 0-1 km SRH around 80-100 m2/s2. Furthermore, away from
   the immediate coast, surface dewpoints lower a few degrees, from
   around 77-79 degrees, to 73-76 degrees. As a result, low-level
   instability quickly diminishes inland. With time, low-to-midlevel
   flow fields are expected to further weaken as TD Marco continues to
   diminish, becoming more of an open surface trough. While additional
   cells offshore will continue tracking northwest and may continue to
   exhibit sporadic low-level rotation, the overall tornado threat is
   expected to remain limited in both time and space.

   ..Leitman/Edwards.. 08/25/2020

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

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

   LAT...LON   29498867 29448903 29848995 30179028 30389031 30589017
               30648995 30618959 30538942 30338904 29958863 29648860
               29498867