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Mesoscale Discussion 660
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   Mesoscale Discussion 0660
   NWS Storm Prediction Center Norman OK
   0920 PM CDT Fri May 17 2019

   Areas affected...portions of the Pecos/Concho Valleys of Texas

   Concerning...Severe Thunderstorm Watch 173...

   Valid 180220Z - 180345Z

   The severe weather threat for Severe Thunderstorm Watch 173

   SUMMARY...Severe risk has gradually decreased in the short term, as
   storms coverage diminishes.

   DISCUSSION...Latest radar loop shows that convection continues to
   decrease in both coverage and intensity in/near WW 173.  At this
   time, only one robust storm remains, and it too has shown signs of
   weakening over the past half hour to hour.

   While some increase in the south-southeasterly low-level jet has
   been noted recently, gradual diurnal cooling of the boundary layer
   -- and thus a re-establishment of capping -- appears to be
   prevailing at this time, with respect to the existing storms.  With
   that said, additional/new storm development -- and
   possible/accompanying severe potential -- remains possible as warm
   advection increases over the next couple of hours (and as hinted at
   by a lone cell recently initiating south of LBB on the retreating
   dryline).  We will continue to monitor convective evolution this
   evening, and any need for additional WW issuance.

   ..Goss.. 05/18/2019

   ...Please see for graphic product...


   LAT...LON   29500129 30160241 30880244 31410186 31720108 31340048
               30800023 29720098 29500129 

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