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Mesoscale Discussion 642
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   MESOSCALE DISCUSSION 0642
   NWS STORM PREDICTION CENTER NORMAN OK
   0312 PM CDT WED MAY 21 2014

   AREAS AFFECTED...IL...IND...OH...WV

   CONCERNING...SEVERE THUNDERSTORM WATCH 164...166...

   VALID 212012Z - 212215Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   164...166...CONTINUES.

   SUMMARY...STORMS CONTINUE TO INCREASE IN COVERAGE WITH LARGE HAIL
   THE MAIN THREAT. A DAMAGING WIND THREAT COULD INCREASE WITH TIME.

   DISCUSSION...STRONG HEATING HAS ALLOWED STORMS TO BECOME MORE
   NUMEROUS WITHIN THE LOW PRESSURE TROUGH FROM CNTRL IL INTO OH. SHEAR
   PROFILES WILL CONTINUE TO INCREASE AND BE FAVORABLE FOR SUPERCELLS
   AS A DISTURBANCE SHIFTS EWD ACROSS THE MO RIVER.

   ALTHOUGH HAIL IS THE MAIN THREAT CURRENTLY....A COLD POOL IS
   EXPECTED TO BUILD DUE TO THE NUMBER OF STORMS...WITH SOME FORWARD
   PROPAGATING EVENTUALLY EXPECTED WITH ASSOCIATED DAMAGING WIND
   THREAT. ANOTHER WATCH IS POSSIBLE LATER TODAY ACROSS SRN IND INTO
   NRN KY.

   TO THE SW INTO ERN MO...OTHER STORMS WERE INCREASING OUT OF WHAT WAS
   INITIALLY MIDLEVEL CONVECTION. IF THESE STORMS GAIN STRENGTH IN THE
   NEXT HOUR...ANOTHER WATCH COULD BE REQUIRED FROM SERN MO INTO SRN
   IL.

   ..JEWELL.. 05/21/2014


   ATTN...WFO...PBZ...RLX...CLE...JKL...ILN...LMK...IWX...IND...
   PAH...LOT...ILX...LSX...SGF...

   LAT...LON   37768731 37789085 38059195 38259201 39109139 40678907
               40598348 39888177 39288082 38258256 37908454 37768731 

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Page last modified: May 21, 2014
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