Mesoscale Discussion 1870
   NWS Storm Prediction Center Norman OK
   1051 PM CST Wed Dec 23 2020

   Areas affected...Louisiana into southwest Mississippi

   Concerning...Tornado Watch 516...

   Valid 240451Z - 240645Z

   The severe weather threat for Tornado Watch 516 continues.

   SUMMARY...The threat for damaging gusts or brief tornadoes continues
   with storms along the front.

   DISCUSSION...Storms have largely consolidated into a squall line
   along the length of the cold front, and should continue to
   accelerate eastward tonight across the remainder of LA and southern
   MS.

   Surface analysis at 04Z shows mid 60s F dewpoints over LA and into
   far southwest MS, which is contributing to around 500 J/kg MLCAPE.
   Shear across the entire region is favorable for a continued severe
   threat, including rotating storms given 0-1 SRH over 200 m2/s2.
   Radar shows sporadic areas of rotation from near JAN southwestward
   into LA, with either damaging gusts or a QLCS tornado possible. If
   the narrow band of instability can remain intact beyond the
   eastern/northern bounds of the watch, then local extensions in time
   or space may become necessary, depending on storm trends.

   ..Jewell.. 12/24/2020

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

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

   LAT...LON   29709356 30069301 30639252 30959199 31379145 31879097
               32499040 32889017 32928954 32648908 32068870 31208881
               30428946 29769070 29279151 29439262 29709356