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Mesoscale Discussion 237
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   MESOSCALE DISCUSSION 0237
   NWS STORM PREDICTION CENTER NORMAN OK
   0342 PM CDT WED APR 08 2015

   AREAS AFFECTED...E-CNTRL MO...SRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 34...

   VALID 082042Z - 082145Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 34
   CONTINUES.

   SUMMARY...A PORTION OF SVR TSTM WATCH 34 MAY NEED TO BE CONVERTED TO
   A TORNADO WATCH WITH ADDITIONAL COUNTIES IN E-CNTRL MO AND SRN IL
   INCLUDED.

   DISCUSSION...SUPERCELL SW OF ST. LOUIS HAS BECOME MUCH BETTER
   ORGANIZED OVER THE LAST 30 MINS OR SO WITH RECENT VELOCITY DATA FROM
   LSX SHOWING STRONG MID-LEVEL ROTATION. SURFACE OBSERVATION AT KFAM
   HAS BACKED OVER THE PAST HOUR WITH ANOTHER DOWNSTREAM AT KSAR ALSO
   SHOWING BACKED FLOW. THE STRENGTH OF THE LOW-LEVEL FLOW IS STILL
   SOMEWHAT WEAK BUT THE OBSERVED BACKING OF THE FLOW AS WELL AS THE
   OBSERVED STORM ORGANIZATION INDICATES THERE IS LIKELY A LOCALIZED
   HIGHER TORNADO THREAT ACROSS E-CNTRL MO AND SRN IL. AS SUCH...A
   TORNADO WATCH MAY BE NEEDED OVER THE AREA. THIS TORNADO WATCH WOULD
   REPLACE PORTIONS OF SVR TSTM WATCH 34 AND ADD ADDITIONAL COUNTIES
   ACROSS E-CNTRL MO AND SRN IL.

   ..MOSIER/CORFIDI.. 04/08/2015


   ATTN...WFO...PAH...LSX...

   LAT...LON   38489086 38558987 38458869 38288799 37938803 37558834
               37498908 37499064 37839112 38489086 

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Page last modified: April 08, 2015
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