Mesoscale Discussion 2016
   NWS Storm Prediction Center Norman OK
   0315 AM CST Sat Dec 11 2021

   Areas affected...northern and central MS into northwest AL

   Concerning...Tornado Watch 558...

   Valid 110915Z - 111045Z

   The severe weather threat for Tornado Watch 558 continues.

   SUMMARY...The threat for a few tornadoes and damaging wind gusts is
   increasing across portions of northern/central MS into northwest AL
   early this morning.

   DISCUSSION...Convection continues to increase in organization and
   intensity across portions of northern MS early this morning ahead of
   the main band of convection stretching from Middle TN to northern
   LA. This convection remains more discrete in a warm sector
   characterized by MLCAPE around 1000-1500 J/kg, effective shear 50+
   kt and STP values around 2-4. Recent data from the KGWX VWP also
   depicts an enlarged, favorably curved low-level hodograph, with very
   strong SRH present. As such, the threat for a few tornadoes and
   damaging wind gusts is increasing across the MCD area. While
   portions of northern MS is within WW 558, this watch expires at 11z
   and a new watch will likely need to be issued, and include portions
   of central MS into northwest AL.

   ..Leitman.. 12/11/2021

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

   ATTN...WFO...OHX...BMX...HUN...MEG...JAN...

   LAT...LON   34079032 34718946 34978895 35058840 35038793 34948761
               34828746 34618748 34188770 33588833 33348886 33048981
               32979032 33019078 33229096 33449091 34079032