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Mesoscale Discussion 872
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   Mesoscale Discussion 0872
   NWS Storm Prediction Center Norman OK
   0424 PM CDT Sat May 27 2017

   Areas affected...southeastern MO

   Concerning...Tornado Watch 275...

   Valid 272124Z - 272230Z

   The severe weather threat for Tornado Watch 275 continues.

   SUMMARY...A high-end and intense bow echo will move across
   southeastern portions of MO and likely result in widespread 70-100
   mph gusts.  The area over far southeastern MO, far southern IL, and
   western KY is being considered for a Particularly Dangerous
   Situation Severe Thunderstorm/or Tornado Watch.

   DISCUSSION...Radar imagery shows a very intense and compact bow echo
   from 15 mi south-southeast VIH to 25 mi north-northeast UNO.  The
   environment is characterized as very unstable with around 3000 J/kg
   MLCAPE immediately ahead of the bow.  50-kt effective shear will
   support a a long-lived MCS as it moves around 55-kt to the east
   towards the MS-OH river confluence over the next few hours.  KSGF
   single site radar imagery showed a 80-95 kt rear inflow jet around
   9000 feet above radar level.  Expecting efficient downward momentum
   transport within the RIJ region of the bow with widespread gusts in
   the 70-100 mph range---resulting in extensive tree damage within the
   localized higher-end swaths.

   ..Smith.. 05/27/2017

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...PAH...LSX...SGF...

   LAT...LON   37979188 37929098 37548950 37248936 36828946 36608977
               36799089 37159209 37979188 

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Page last modified: May 27, 2017
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