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Mesoscale Discussion 149
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MD 149 graphic

   Mesoscale Discussion 0149
   NWS Storm Prediction Center Norman OK
   0659 PM CDT Mon Mar 19 2018

   Areas affected...North central and northeast AL

   Concerning...Tornado Watch 13...

   Valid 192359Z - 200130Z

   The severe weather threat for Tornado Watch 13 continues.

   SUMMARY...Cluster of supercells will continue to pose a threat for
   tornadoes, large hail, and damaging winds for the next few hours
   along the warm front in north central and northeast AL.

   DISCUSSION...A cluster of supercells continues to move
   east-southeastward across north central AL this evening.  Thus far,
   the more intense storms have tended to be the lead cells in the
   cluster, though interactions with upstream convection have
   interfered with more classic supercell structures.  Recent discrete
   development south of the cluster will lead to additional cell
   mergers and a continued messy convective mode.  Still, the
   storm-scale environment is favorable for tornadic supercells along
   the surface warm front in AL, which represents the southern edge of
   the stronger low-level shear/hodograph curvature and the northern
   edge of the more unstable warm sector.

   ..Thompson.. 03/19/2018

   ...Please see for graphic product...


   LAT...LON   34478661 34418601 34228568 34048544 33528540 33508584
               33938681 34128712 34298698 34398684 34478661 

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