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Mesoscale Discussion 487
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   MESOSCALE DISCUSSION 0487
   NWS STORM PREDICTION CENTER NORMAN OK
   0139 AM CDT WED APR 30 2014

   AREAS AFFECTED...PARTS OF THE FLORIDA PANHANDLE AND ADJACENT SE
   ALABAMA/SW GEORGIA

   CONCERNING...TORNADO WATCH 120...

   VALID 300639Z - 300815Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 120 CONTINUES.

   SUMMARY...POTENTIALLY DAMAGING WIND GUSTS...SOME ENHANCED BY
   MESO-VORTICES ...PERHAPS AN ISOLATED TORNADO...MAY REACH AREAS
   NEAR/NORTH OF TALLAHASSEE BY 09-10Z.

   DISCUSSION...FORWARD PROPAGATION OF A RECENTLY EVOLVED SMALL BUT
   INTENSE MESOSCALE CONVECTIVE SYSTEM ONLY APPEARS AROUND 20 KT...
   WITH ACTIVITY EMBEDDED WITHIN RELATIVELY MODEST DEEP LAYER WESTERLY
   MEAN FLOW.  HOWEVER...THE SYSTEM HAS A WELL DEVELOPED LOWER/MID
   TROPOSPHERIC CYCLONIC CIRCULATION...NEAR THE COMMA HEAD OF ITS BOW
   ECHO SIGNATURE IN RADAR REFLECTIVITIES.  AND AN ASSOCIATED WESTERLY
   REAR INFLOW JET MAY BE IN EXCESS OF 50 KTS IN STRENGTH.  WITH HEAVY
   PRECIPITATION LOADING CONTRIBUTING TO THE DOWNWARD TRANSFER OF THIS
   MOMENTUM...A NARROW SWATH SEVERE WIND GUSTS APPEARS POSSIBLE FOR AT
   LEAST ANOTHER COUPLE OF HOURS.  THIS MAY AFFECT AREAS FROM
   TALLAHASSEE FL NORTHWARD THROUGH BAINBRIDGE GA BY 09-10Z...BEFORE
   INFLOW OF LESS MOIST/MORE STABLE NEAR SURFACE AIR PERHAPS BEGINS TO
   IMPACT THE CONVECTION.

   ..KERR.. 04/30/2014


   ATTN...WFO...TAE...

   LAT...LON   31278531 31368466 31208423 30438425 30028462 29968553
               30188586 30708521 31278531 

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Page last modified: April 30, 2014
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