Mesoscale Discussion 1607
   NWS Storm Prediction Center Norman OK
   0235 PM CDT Thu Aug 31 2017

   Areas affected...Parts of eastern Mississippi...western Alabama and
   adjacent portions of Tennessee

   Concerning...Tornado Watch 476...

   Valid 311935Z - 312130Z

   The severe weather threat for Tornado Watch 476 continues.

   SUMMARY...Risk for generally isolated and relatively short-lived
   tornadoes continues through late afternoon.

   DISCUSSION...Richer low-level moisture (characterized by mid 70s F+
   surface dew points) remains focused in a narrow plume centered
   roughly near the Mississippi/Alabama state border area.  Coupled
   with continuing insolation, this is contributing to modest boundary
   layer CAPE, in the presence of 40-50 kt southerly 850 mb flow. 

   On the northern edge of this environment, a corridor extending from
   around Tuscaloosa AL into areas near/east of Tupelo MS still appears
   most favorable for supercell development accompanied by a risk for
   tornadoes, into and through the 21-22Z time frame.  This is where
   near surface winds are maintaining an easterly/southeasterly
   component in the presence of substantive surface pressure falls, in
   advance of the northeastward migrating remnant circulation center of
   Harvey.

   ..Kerr.. 08/31/2017

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

   ATTN...WFO...BMX...HUN...MOB...MEG...JAN...

   LAT...LON   32538853 33438877 33848903 34478884 34798778 33408715
               32308796 32538853