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, KS. 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 stabilizes. ..Squitieri/Guyer.. 09/03/2021 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...TOP...ICT... LAT...LON 38219754 39079720 39349664 39239604 38879560 38409562 38169595 38049671 38089706 38219754
Storm Prediction Center Mesoscale Discussion 1689
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