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Mesoscale Discussion 152
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MD 152 graphic

   Mesoscale Discussion 0152
   NWS Storm Prediction Center Norman OK
   1018 PM CDT Mon Mar 19 2018

   Areas affected...East central AL

   Concerning...Tornado Watch 13...

   Valid 200318Z - 200415Z

   The severe weather threat for Tornado Watch 13 continues.

   SUMMARY...Thunderstorm development may persist through about 05z
   along an outflow boundary, thus justifying a local watch extension
   beyond the scheduled 04z expiration.

   DISCUSSION...Training convection continues to initiate along the
   outflow boundary trailing westward from the lead supercells that
   have now largely moved into GA.  Per regional VWPs, low-level flow
   has been slowly veering with time in AL, which should lead to a
   reduction in storm formation across AL within the next 2-3 hours. 
   However, storm development will likely persist along the outflow
   boundary until at about 05z, while any warm sector development along
   the surface trough will become less probable after 04z.  As such, a
   local extension of tornado watch 13 in time is possible to reflect
   the lingering large hail/damaging wind threat across a small part of
   east central AL.

   ..Thompson.. 03/20/2018

   ...Please see for graphic product...


   LAT...LON   33188534 33178580 33288607 33488610 33668604 33758581
               33768543 33648533 33378532 33188534 

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