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Mesoscale Discussion 147
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   Mesoscale Discussion 0147
   NWS Storm Prediction Center Norman OK
   0506 PM CDT Mon Mar 19 2018

   Areas affected...Northern AL

   Concerning...Tornado Watch 13...

   Valid 192206Z - 200000Z

   The severe weather threat for Tornado Watch 13 continues.

   SUMMARY...Greatest tornado threat will be focused along warm front
   in northern AL through about 00z.  Significant tornadoes will be
   possible.

   DISCUSSION...Supercells are intensifying along a surface trough
   across northeast MS, and these storms will spread across northern AL
   through the late afternoon/evening.  The southwest-northeast
   orientation of the initiating surface trough has supported some
   storm interactions.  However, even with a supercell cluster mode,
   the ongoing storms will move into a more favorable environment for
   tornadoes with time in AL.  Low-level shear will be strongest near
   and north of the warm front, which also denotes the northeast edge
   of the most unstable portions of the warm sector (MLCAPE at or above
   2000 J/kg).  This corridor along the warm front will provide the
   most favorable environment for significant tornadoes for the next
   few hours as the supercells mature and begin to move
   east-southeastward along the boundary.

   ..Thompson.. 03/19/2018

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

   ATTN...WFO...BMX...HUN...MEG...

   LAT...LON   34718786 34668739 34518669 34318649 34058646 33898677
               34048733 34118790 34298814 34668813 34718786 

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