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Mesoscale Discussion 775
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   Mesoscale Discussion 0775
   NWS Storm Prediction Center Norman OK
   0407 AM CDT Fri May 19 2017

   Areas affected...East central Missouri into west central Illinois

   Concerning...Severe potential...Watch needed soon 244...

   Valid 190907Z - 191100Z

   Probability of Watch Issuance...95 percent

   SUMMARY...A line of potentially damaging winds is currently
   developing across east central Missouri, and may affect the St.
   Louis metro area by 10Z.

   DISCUSSION...A long-lived line of storms with substantial cold pool
   continues to move eastward across Missouri. Recently, radar trends
   have shown this cold pool to be accelerating to over 50 mph, with
   base velocities off the LSX radar in excess of 60 kt, with small
   areas over 70 kt. In addition, the area directly east across St.
   Louis lies in a zone of relatively warmer/more unstable air, and,
   surface pressure falls continue in advance of this system. As a
   result, a watch will be issues shortly.

   ..Jewell/Guyer.. 05/19/2017

   ...Please see for graphic product...


   LAT...LON   37699134 38149174 38489207 38759212 39049183 39399042
               39398964 39258915 38758883 38248911 37868982 37719049

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