Mesoscale Discussion 0035
   NWS Storm Prediction Center Norman OK
   0928 AM CST Sat Jan 11 2020

   Areas affected...Northern AL...Middle/eastern TN...Northwest GA

   Concerning...Tornado Watch 12...

   Valid 111528Z - 111700Z

   The severe weather threat for Tornado Watch 12 continues.

   SUMMARY...Threat for damaging wind and perhaps a tornado or two
   continues across WW 12. Local watch extension will likely be needed
   across middle TN, and downstream watch issuance is likely by 18Z
   into northeast AL/northwest GA/eastern TN.

   DISCUSSION...Extensive QLCS is ongoing across middle TN into
   northern AL at 1530Z. Over the last hour, the eastward progression
   of the QLCS has slowed across northern AL, while some northeastward
   push is still noted across middle TN. Instability downstream of this
   system is quite meager, but sufficient to allow maintenance or only
   a slow weakening of the QLCS in the short term. Very strong
   low-level flow/shear (70-80 kt of flow at around 1 km AGL) will
   continue to support the potential for damaging wind and perhaps a
   brief tornado as the northern portion of the QLCS spreads
   northeastward across middle TN. A local extension of WW 12 may be
   necessary across TN to cover this threat in the short term, with
   downstream watch issuance likely into eastern TN by 18Z. 

   Further south across northern AL, the recent lack of eastward
   progression of the QLCS may allow for somewhat greater
   destabilization downstream before the system begins to surge
   eastward again by late morning/early afternoon. This could result in
   a somewhat greater wind/tornado risk later today compared to areas
   further north. Downstream watch issuance into northeast AL/northwest
   GA will become increasingly likely by 18Z.

   ..Dean/Hart.. 01/11/2020

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

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

   LAT...LON   34008809 34588771 35738698 36498668 36558563 36548481
               36158459 35528467 35018503 34678531 34288591 34018626
               33728663 33618739 33608800 34008809