Mesoscale Discussion 1618
   NWS Storm Prediction Center Norman OK
   0519 PM CDT Fri Aug 28 2020

   Areas affected...northern Alabama into southern Middle Tennessee

   Concerning...Tornado Watch 467...

   Valid 282219Z - 290015Z

   The severe weather threat for Tornado Watch 467 continues.

   SUMMARY...The threat for a few tornadoes persists across northern
   Alabama, and may eventually develop northeastward toward Chattanooga
   before weakening this evening.

   DISCUSSION...Several supercells are currently ongoing over northern
   AL, with persistent midlevel rotation. The HTX VWP shows sufficient
   0-1 SRH for a tornado threat at around 150 m2/s2, and surface
   observations continue to show modest pressure falls downstream.

   The air mass also remains very moist with GPS PWAT values over 2.00"
   over northeast AL/northwest GA. While at least some diurnal decrease
   is possible after 01Z, conditions will remain favorable for
   tornadoes for a few hours, perhaps reaching as far northeast as
   Chattanooga. If storms remain severe through 01Z, an additional
   watch could be considered.

   ..Jewell.. 08/28/2020

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

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

   LAT...LON   33498832 33748834 34078784 34588741 35108710 35348655
               35408569 35308524 35058510 34618527 34248567 33498723
               33388795 33408817 33498832