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Mesoscale Discussion 264
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   MESOSCALE DISCUSSION 0264
   NWS STORM PREDICTION CENTER NORMAN OK
   0801 PM CDT THU APR 09 2015

   AREAS AFFECTED...FAR SOUTHEAST MO AND CENTRAL/SOUTHERN IL INTO
   WESTERN INDIANA/WESTERN KY

   CONCERNING...TORNADO WATCH 46...50...

   VALID 100101Z - 100230Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 46...50...CONTINUES.

   SUMMARY...SEVERE THUNDERSTORMS/SUPERCELLS CAPABLE OF SEVERE
   HAIL/DAMAGING WINDS AND A FEW TORNADOES WILL CONTINUE TO SPREAD
   EASTWARD ACROSS EAST-CENTRAL/SOUTH-CENTRAL IL AND FAR SOUTHEAST
   MO/SOUTHWEST IL THROUGH MID/LATE EVENING.

   DISCUSSION...SCATTERED SEVERE THUNDERSTORMS INCLUDING A FEW
   SUPERCELLS CONTINUE TO SPREAD EASTWARD ROUGHLY PARALLEL TO I-55 IN
   CENTRAL/SOUTHWEST IL AND INTO FAR SOUTHEAST MO AS OF 01Z/8PM CDT.
   ADEQUATE BOUNDARY LAYER MOISTURE /LOWER 60S F SURFACE DEWPOINTS/
   EXISTS WITHIN THE WARM SECTOR AHEAD OF AN EASTWARD-MOVING COLD
   FRONT...ALTHOUGH SURFACE TEMPERATURES HAVE BEGUN TO SLIGHTLY COOL
   POST-SUNSET. NONETHELESS...THE 00Z OBSERVED SOUNDING FROM LINCOLN IL
   SAMPLED AMPLE LOW-LEVEL/DEEP-LAYER SHEAR AND 1000+ J/KG MLCAPE...AN
   ENVIRONMENT FAVORABLE FOR SEVERE THUNDERSTORMS INCLUDING
   SUPERCELLS/SOME BOWS. REGIONAL WSR-88D VWP DATA IS ALREADY SAMPLING
   NEARLY 45-50 KT SOUTHWESTERLY WINDS WITHIN THE LOWEST 1-2 KM...AND
   WITH ANTICIPATIONS OF FURTHER STRENGTHENING THIS EVENING...THE
   POTENTIAL FOR HIGHLY ORGANIZED STORM MODES CAPABLE OF DAMAGING
   WINDS/TORNADOES WILL CONTINUE EVEN AS SOME ADDITIONAL COOLING OF THE
   BOUNDARY LAYER OCCURS.

   ..GUYER.. 04/10/2015


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

   LAT...LON   37359084 39158971 39788895 40168685 38288725 36648904
               37359084 

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Page last modified: April 10, 2015
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