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Mesoscale Discussion 481
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   MESOSCALE DISCUSSION 0481
   NWS STORM PREDICTION CENTER NORMAN OK
   0947 AM CDT MON APR 27 2015

   AREAS AFFECTED...SE LA...SRN MS

   CONCERNING...TORNADO WATCH 126...

   VALID 271447Z - 271615Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 126 CONTINUES.

   SUMMARY...A TORNADO AND WIND-DAMAGE THREAT SHOULD CONTINUE FOR
   SEVERAL MORE HOURS BUT IS EXPECTED TO DIMINISH EARLY THIS AFTERNOON.
   WW ISSUANCE IS NOT ANTICIPATED TO THE EAST OF WW 126 BUT A LOCAL
   EXTENSION MAY BE NECESSARY ACROSS PARTS OF SRN MS AS THE BOW MOVES
   OUT OF THE WATCH.

   DISCUSSION...A FAST-MOVING BOWING LINE SEGMENT IN SE LA IS MOVING
   EWD ALONG A FRONTAL BOUNDARY SITUATED FROM NEAR LAKE PONTCHARTRAIN
   EWD TO JUST OFFSHORE FROM THE SRN MS AND SRN AL COASTS. THE GREATEST
   INSTABILITY IS LOCATED OVER SE LA WHERE MESOANALYSIS SHOWS MLCAPE OF
   1000 TO 1500 J/KG. AS THE LINE MOVES EWD...IT WILL ENCOUNTER WEAK
   INSTABILITY ALONG THE COAST OF SRN MS AND TEND TO FAVOR THE STRONGER
   INSTABILITY FURTHER OFFSHORE. FOR THIS REASON...THE LINE IS EXPECTED
   TO CONTINUE TO TURN ESEWD. THIS STORM MOTION MAY ALLOW THE NRN END
   OF THE LINE TO AFFECT THE COASTAL COUNTIES OF SRN MS OVER THE NEXT 2
   TO 3 HOURS WHERE A LOCAL WW EXTENSION WILL PROBABLY BE NEEDED. DUE
   TO LIMITED INSTABILITY ONSHORE ACROSS FAR SRN AL AND THE FL
   PANHANDLE...NO WATCH IS ANTICIPATED TO THE EAST OF THE CURRENT
   WATCH.

   ..BROYLES/MEAD.. 04/27/2015


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

   LAT...LON   31649086 30699062 30089083 29449129 29119148 28849150
               28619093 28669000 29448867 30488835 31158868 31528958
               31649086 

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Page last modified: April 27, 2015
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