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Mesoscale Discussion 1391
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   Mesoscale Discussion 1391
   NWS Storm Prediction Center Norman OK
   1253 AM CDT Sat Jul 22 2017

   Areas affected...Central Indiana

   Concerning...Severe potential...Watch likely 

   Valid 220553Z - 220700Z

   Probability of Watch Issuance...80 percent

   SUMMARY...Bowing segment in northwest IN could persist for a few
   hours while moving southeastward, with an attendant damaging-wind
   threat.  A new severe thunderstorm watch may be needed soon
   downstream into central IN.

   DISCUSSION...A bowing segment is moving southeastward at about 45 kt
   into northwest IN.  This convection will likely persist for a few
   more hours as it moves along the immediate cool side of a
   northwest-southeast outflow boundary across central IN.  A feed of
   rich low-level moisture (mid 70s dewpoints) from the west will
   maintain the convection as it forward propagates along the
   boundary/buoyancy gradient in the zone of stronger storm-relative
   inflow.  Given the organization of the convection in combination
   with the moderate-strong buoyancy feed and modestly enhanced
   vertical shear, the threat for a few damaging gusts could continue
   for a few more hours.  As such, a new severe thunderstorm watch will
   be proposed shortly.

   ..Thompson/Edwards.. 07/22/2017

   ...Please see for graphic product...


   LAT...LON   40828621 40718577 40178489 39848480 39468497 39448561
               40058658 40478706 40608699 40808673 40828621 

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