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Mesoscale Discussion 921
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   MESOSCALE DISCUSSION 0921
   NWS STORM PREDICTION CENTER NORMAN OK
   0151 AM CDT SAT JUN 01 2013

   AREAS AFFECTED...SRN IL VICINITY WSWWD ACROSS SRN MO/NWRN AR

   CONCERNING...TORNADO WATCH 266...

   VALID 010651Z - 010845Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 266 CONTINUES.

   SUMMARY...SEVERE/ISOLATED TORNADO THREAT CONTINUES ACROSS VALID
   PORTIONS OF THE WW AREA.

   DISCUSSION...A LINE OF STRONG/LOCALLY SEVERE THUNDERSTORMS EXTENDS
   SWWD OUT OF INDIANA ACROSS SRN IL AND INTO SERN MO -- MOVING ESEWD
   AT ROUGHLY 30 KT.  FARTHER W -- OVER THE SWRN MO VICINITY...A
   CLUSTER OF MORE ISOLATED/LOCALLY SEVERE CELLS IS ONGOING.  

   THESE CELLS ARE ONGOING WITHIN A MODERATELY UNSTABLE
   ENVIRONMENT...OVERLAYED BY MID-LEVEL WLY FLOW AT AROUND 35 KT -- AND
   THUS EXPECT SEVERE THREAT TO CONTINUE.  AN ISOLATED TORNADO OR TWO
   WILL ALSO BE POSSIBLE -- PARTICULARLY OVER SWRN PORTIONS OF THE WW.

   THE BAND OF STORMS CROSSING SRN IL/SERN MO WILL BEGIN TO APPROACH
   THE EDGE OF THE WATCH IN THE NEXT HOUR.  WE WILL MONITOR EVOLUTION
   OF THIS PORTION OF THE LINE FOR POSSIBLE NEW WW.  HOWEVER...WITH
   DOWNSTREAM AIRMASS INTO WRN KY/NWRN TN LESS UNSTABLE AND SOMEWHAT
   ANAFRONTAL CHARACTER OF THE CONVECTION...STORM INTENSITY MAY
   DIMINISH WITH TIME.

   ..GOSS.. 06/01/2013


   ATTN...WFO...IND...PAH...ILX...LSX...LZK...SGF...TSA...

   LAT...LON   38938769 37588756 35779449 37089489 37509446 37509336
               37349221 37818993 38938769 

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