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Storm Prediction Center Mesoscale Discussion 1689

   Mesoscale Discussion 1689
   NWS Storm Prediction Center Norman OK
   0924 PM CDT Thu Sep 02 2021

   Areas affected...Portions of eastern Kansas

   Concerning...Tornado Watch 487...

   Valid 030224Z - 030400Z

   The severe weather threat for Tornado Watch 487 continues.

   SUMMARY...A damaging gust or two remains possible over the next
   couple of hours, particularly with a supercell across Lyon County,

   DISCUSSION...Multiple semi-discrete storms/clusters are persisting
   across portions of eastern Kansas amid adequate deep-layer ascent
   and buoyancy (1000+ J/kg MLCAPE). While deep-layer (50+ kts) and
   low-level shear (300 m2/s2 effective SRH) are present across the
   warm sector, convective inhibition is increasing with the onset of
   nocturnal cooling (i.e. temperatures dropping below 80F in several
   locales). That being said, storms should remain organized (evident
   via a sustained supercell structure across Lyon County, KS) for at
   least a few more hours. However, increasing static stability within
   the boundary-layer will diminish efficient downward momentum
   transport, limiting damaging gust potential to the most robust storm
   updrafts, with the greatest potential for severe associated with the
   Lyon County supercell. Otherwise, an overall decrease in severe
   potential is expected overnight as the boundary layer further

   ..Squitieri/Guyer.. 09/03/2021

   ...Please see for graphic product...


   LAT...LON   38219754 39079720 39349664 39239604 38879560 38409562
               38169595 38049671 38089706 38219754