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Mesoscale Discussion 603
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   MESOSCALE DISCUSSION 0603
   NWS STORM PREDICTION CENTER NORMAN OK
   0219 PM CDT WED MAY 11 2016

   AREAS AFFECTED...ECNTRL MO...CNTRL/SRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 167...

   VALID 111919Z - 112015Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 167
   CONTINUES.

   SUMMARY...SEVERE HAIL REMAINS LIKELY WITH TSTM ACTIVITY ACROSS WW
   THIS AFTERNOON.  LOCALLY DAMAGING WINDS ARE ALSO POSSIBLE.

   DISCUSSION...SLOW-MOVING CLUSTER OF SEVERE TSTMS IS PROGRESSING
   ACROSS THE STL METRO AREA INTO WRN IL.  VERY LARGE HAIL HAS BEEN
   NOTED WITH THIS ACTIVITY AND LATEST MRMS DATA SUGGESTS SEVERE HAIL
   CONTINUES WITH UPDRAFTS OVER MONROE/ST. CLAIR COUNTY IL.  18Z
   SOUNDING FROM ILX EXHIBITS SUBSTANTIAL INSTABILITY WITH STRONG
   SFC-6KM BULK SHEAR...ALONG WITH BACKED LOW-LEVEL WINDS NORTH OF THE
   BOUNDARY.  THIS WOULD SEEM SUPPORTIVE OF SUPERCELLS AND PERHAPS EVEN
   AN ISOLATED TORNADO.  OTHERWISE...ONGOING CLUSTER NEAR STL SHOULD
   CONTINUE TO MATURE AS IT PROPAGATES ALONG SFC BOUNDARY ACROSS SCNTRL
   IL.

   ..DARROW.. 05/11/2016


   ATTN...WFO...IND...PAH...ILX...LSX...

   LAT...LON   39949114 40158749 38278749 38059113 39949114 

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Page last modified: May 11, 2016
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