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Mesoscale Discussion 455
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   MESOSCALE DISCUSSION 0455
   NWS STORM PREDICTION CENTER NORMAN OK
   0150 PM CDT SAT APR 25 2015

   AREAS AFFECTED...PORTIONS OF SERN LA...SRN MS...SRN AL...AND NRN FL

   CONCERNING...SEVERE THUNDERSTORM WATCH 111...

   VALID 251850Z - 252015Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 111
   CONTINUES.

   SUMMARY...A CLUSTER OF THUNDERSTORMS OVER SERN LA WILL CONTINUE
   MOVING EAST/NORTHEASTWARD OVER THE NEXT SEVERAL HOURS WHILE POSING A
   RISK FOR DAMAGING WINDS AND LARGE HAIL. A DOWNSTREAM SEVERE
   THUNDERSTORM WATCH HAS BEEN ISSUED FOR PORTIONS OF SRN AL/NRN FL.

   DISCUSSION...RECENT RADAR TRENDS CONCERNING CONVECTION ACROSS SERN
   LA SUGGEST STRONG TO OCCASIONALLY SEVERE WINDS WILL CONTINUE EWD
   ACROSS SRN MS OVER THE NEXT HOUR OR SO. ISOLATED SUPERCELL
   DEVELOPMENT AHEAD OF THE MAIN CLUSTER OF STORMS NOW OVER/JUST N OF
   NEW ORLEANS WILL ALSO POSE A LARGE HAIL/DAMAGING WIND RISK. AS
   TEMPERATURES HAVE WARMED INTO THE LOWER 80S ACROSS SRN
   MS/AL...MLCAPE HAS INCREASED TO AROUND 2000 J/KG. SWLY WINDS
   INCREASING WITH HEIGHT ASSOCIATED WITH A MID TO UPPER LEVEL JET
   STREAK ARE CONTRIBUTING TO GENERALLY 50-60 KT OF EFFECTIVE SHEAR.
   GIVEN THAT THIS FAVORABLE THERMODYNAMIC/KINEMATIC ENVIRONMENT IS
   EXPECTED TO PERSIST THROUGH AT LEAST THE EARLY EVENING...A NEW
   SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR PORTIONS OF SRN AL AND
   NRN FL. THE TORNADO THREAT ACROSS THIS REGION REMAINS LOW GIVEN
   LARGELY UNIDIRECTIONAL LOW-LEVEL FLOW EVIDENT ON AREA VWPS.

   ..GLEASON.. 04/25/2015


   ATTN...WFO...MOB...JAN...LIX...

   LAT...LON   29418977 29679049 30309062 31198973 31688836 31948703
               31918627 30108658 29888847 29418977 

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Page last modified: April 25, 2015
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