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Mesoscale Discussion 466
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   Mesoscale Discussion 0466
   NWS Storm Prediction Center Norman OK
   0614 PM CDT Sat May 19 2018

   Areas affected...West Tennessee...western Kentucky...far southern
   Illinois...far southeastern Missouri...and far northeastern Arkansas

   Concerning...Severe Thunderstorm Watch 107...

   Valid 192314Z - 200015Z

   The severe weather threat for Severe Thunderstorm Watch 107

   SUMMARY...The severe threat continues across the discussion area,
   and some propagation of convection outside of WW 107 is possible
   near the Memphis, TN area and across western Kentucky.  Local
   spatial extensions of 107 may be warranted.

   DISCUSSION...A couple of linear convective complexes have evolved
   across the discussion area over the past hour or so - one just north
   of the Memphis, TN area and another extending from far southern
   Illinois into western Kentucky near Paducah, KY.  An additional
   cluster of storms was located very near the Paris, TN area as well. 
   These storms remain outflow dominant given weak deep shear profiles,
   and it is not out of the question for an isolated damaging wind
   threat to evolve along the leading edges of these complexes as they
   continue to propagate slowly across the discussion area. 
   Furthermore, an isolated severe threat will exist near a stalled
   outflow boundary in northeastern Arkansas over the next hour of so
   given the moderately to strongly unstable airmass in place across
   that area.  This threat should persist through the scheduled
   expiration time of the watch (01Z), although storms may begin to
   exhibit a weakening trend before that time given the presence of
   rain-cooled air across far southeastern portions of the WW from a
   previous MCS.

   ..Cook.. 05/19/2018

   ...Please see for graphic product...


   LAT...LON   37238956 37528927 37508890 37098835 36498804 35988810
               35418840 35228891 35108954 34998987 35039003 35289033
               35679065 36139109 36379115 36499090 36479035 36588990
               36798965 37238956 

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