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Mesoscale Discussion 891
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   Mesoscale Discussion 0891
   NWS Storm Prediction Center Norman OK
   1252 AM CDT Sun May 28 2017

   Areas affected...southeastern OK / west-central AR

   Concerning...Severe Thunderstorm Watch 290...

   Valid 280552Z - 280615Z

   The severe weather threat for Severe Thunderstorm Watch 290

   SUMMARY...An evolution to a small-scale bow echo is seemingly
   occurring across southeastern OK.  A concentrated swath of 55-70 mph
   winds would accompany the bow.

   DISCUSSION...Radar data (mosaic and 9-km CAPPI) show a cluster of
   storms beginning to evolve into a bow.  The Clayton and Talihina OK
   mesonet sites measured 49 mph and 50 mph gusts in the past 20
   minutes.  A very moisture rich airmass(surface dewpoints in the
   middle 70s degrees F) ahead of the bow is characterized as very
   unstable (3500 J/kg MLCAPE) according to objective analysis.  KSRX
   and KLZK VAD data show 500-mb flow around 50 kt and this region is
   within a belt of southwesterly 40-kt 850-mb flow.  The steep lapse
   rates and strong deep shear will combine to strongly favor organized
   storm structures with severe gusts becoming the primary threat as it
   moves into west-central AR.

   ..Smith.. 05/28/2017

   ...Please see for graphic product...


   LAT...LON   34039533 34509487 34919516 34859392 34429334 34059388

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