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Mesoscale Discussion 793
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   Mesoscale Discussion 0793
   NWS Storm Prediction Center Norman OK
   0916 PM CDT Fri May 19 2017

   Areas affected...portions of southern Missouri...eastern
   Oklahoma...and northwest Arkansas

   Concerning...Tornado Watch 248...249...

   Valid 200216Z - 200315Z

   The severe weather threat for Tornado Watch 248, 249 continues.

   SUMMARY...Strong/locally severe storms continue moving
   east/northeast across ww 248 and 249, with severe/isolated tornado
   risk gradually spreading east across the Ozarks region.  A new
   tornado watch will be required.

   DISCUSSION...Latest radar loop shows and broken band of storms --
   including embedded rotating updrafts, extending from southwest MO
   southwest across eastern Oklahoma along and ahead of an advancing
   cold front.  Other/more isolated cells are evolving ahead of this
   band over portions of the Ozarks.  With time, a moderately unstable
   airmass downstream of the storms, and south of a west-to-east cold
   front sagging south across central Missouri, will support eastward
   spread of the convection.  Given amply strong flow aloft, expect the
   risk for locally damaging winds and some hail, and potential for
   isolated/brief tornadoes to accompany stronger updrafts --
   warranting issuance of a new watch downstream of the existing storms
   to extend into the overnight hours.

   ..Goss.. 05/20/2017

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

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

   LAT...LON   38249134 37119117 36239117 35299202 34309386 34329512
               34619569 35029584 35869535 36919460 38279302 38249134 

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