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Mesoscale Discussion 858
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   Mesoscale Discussion 0858
   NWS Storm Prediction Center Norman OK
   0354 AM CDT Sat May 27 2017

   Areas affected...parts of southern Missouri and northern Arkansas
   and into western parts of Kentucky and Tennessee

   Concerning...Severe Thunderstorm Watch 272...

   Valid 270854Z - 271100Z

   The severe weather threat for Severe Thunderstorm Watch 272
   continues.

   SUMMARY...Storms continue to gradually increase/organize into a
   small MCS over the AR/MO border region, with ongoing/local severe
   risk.  New/downstream WW appears likely to be necessary.

   DISCUSSION...Latest radar loop shows a cluster of storms that
   appears to be evolving into a small MCS over Howell County MO and
   adjacent Fulton and Izard Counties in Ar, and trailing west to
   Marion County AR.  

   With an amply unstable airmass extending east to/across the
   mid-Mississippi Valley, and given the convection's co-location with
   a weak/mobile center of cyclonic circulation evident in water vapor
   imagery, expect that storms -- and likely a local severe risk --
   will continue east of the existing watch.  As such, new WW appears
   likely.

   ..Goss.. 05/27/2017

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

   ATTN...WFO...PAH...MEG...LSX...LZK...SGF...TSA...

   LAT...LON   35899236 35969283 36149322 36369332 36569305 36769251
               37259148 37379002 37278931 36728897 35728932 35509023
               35899236 

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