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Mesoscale Discussion 345
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   MESOSCALE DISCUSSION 0345
   NWS STORM PREDICTION CENTER NORMAN OK
   0912 PM CDT SUN APR 13 2014

   AREAS AFFECTED...ERN MO/WRN IL...SWD INTO NERN AR/WRN TN

   CONCERNING...SEVERE THUNDERSTORM WATCH 75...

   VALID 140212Z - 140315Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 75
   CONTINUES.

   SUMMARY...SEVERE THREAT APPEARS TO BE WANING ACROSS REMAINDER OF
   WW75 AND AREAS IMMEDIATELY DOWNSTREAM.

   DISCUSSION...EARLIER WELL-ORGANIZED SQUALL LINE HAS PROGRESSED
   ACROSS MOST OF WW75.  MO PORTION OF FRONTAL SQUALL LINE...ROUGHLY
   250 MI LONG...HAS DECREASED MARKEDLY OVER THE LAST FEW HOURS AS
   CONVECTION MOVES INTO INCREASINGLY HOSTILE AIR MASS DOWNSTREAM. 
   ADDITIONALLY...A BROAD CORRIDOR OF WARM-ADVECTION CONVECTION HAS
   SPREAD/DEVELOPED NNEWD ACROSS ERN AR/SERN MO INTO SRN IL AND THIS
   PRECIP SHIELD HAS CONTRIBUTED TO STABILIZATION JUST AHEAD OF
   WEAKENING SQUALL LINE.  ALONG THE SWRN FLANK OF WARM ADVECTION
   CONVECTION...A FEW ORGANIZED LINE SEGMENTS HAVE EVOLVED OVER NERN
   AR.  WHILE THIS ACTIVITY MAY PRODUCE GUSTY WINDS OR SMALL-SCALE
   VORTICES AS IT CROSSES THE MS RIVER INTO WRN TN THERE IS LITTLE
   REASON TO BELIEVE SUFFICIENT INSTABILITY RESIDES WITHIN INFLOW
   REGION OF CONVECTION TO WARRANT ORGANIZED SEVERE THREAT.

   ..DARROW.. 04/14/2014


   ATTN...WFO...PAH...MEG...LSX...LZK...SGF...

   LAT...LON   35019119 36579229 39479099 38878912 35678979 35019119 

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Page last modified: April 14, 2014
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