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Mesoscale Discussion 782
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   MESOSCALE DISCUSSION 0782
   NWS STORM PREDICTION CENTER NORMAN OK
   0350 AM CDT TUE MAY 26 2015

   AREAS AFFECTED...SOUTHEAST LA AND SOUTHEAST MS

   CONCERNING...TORNADO WATCH 219...

   VALID 260850Z - 261015Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 219 CONTINUES.

   SUMMARY...LOCALLY STRONG WIND GUSTS AND/OR A TORNADO REMAIN ISOLATED
   SEVERE WEATHER THREATS THROUGH THE EARLY MORNING /PRIOR TO SUNRISE/
   ACROSS SOUTHEAST PORTIONS OF LA AND MS.  A NEW WATCH IS NOT
   ANTICIPATED TO THE EAST OF WW 219.

   DISCUSSION...AT 0320Z...MOSAIC RADAR IMAGERY INDICATED THE LEADING
   PORTION OF AN EASTWARD-MOVING MCS EXTENDED FROM EXTREME
   SOUTH-CENTRAL MS THROUGH SERN LA /NEAR 10 W MSY/ TO OFF THE LA COAST
   IN WRN TERREBONNE PARISH.  SOUTH-SOUTHEASTERLY LOW-LEVEL WINDS AHEAD
   OF THIS LINE OF STORMS WAS MAINTAINING AN INFLUX OF RICH TROPICAL
   MOISTURE WITH SURFACE DEW POINTS IN THE MIDDLE 70S COMMON FROM SERN
   LA INTO FAR SERN MS.  THE 00Z SLIDELL SOUNDING MODIFIED FOR THESE
   SURFACE DEW POINT VALUES AND SOME INCREASE IN SURFACE TEMPERATURES
   THE LAST FEW HOURS INDICATED A SUFFICIENT REDUCTION IN SURFACE-BASED
   INHIBITION THAT WOULD SUPPORT A POTENTIAL FOR STRONGER WINDS TO
   REACH THE SURFACE.  DESPITE THIS FACTOR...THE CONTINUED EWD
   ADVANCEMENT OF THIS MCS IS RESULTING IN IT BECOMING MORE DIVORCED
   SPATIOTEMPORALLY FROM GREATER UPPER FORCING FOR ASCENT WITH A
   SHORTWAVE TROUGH TRACKING NORTHEAST TOWARD THE MID-SOUTH AND OZARK
   PLATEAU.  THE LINE OF STORMS SHOULD CONTINUE TO SPREAD E/ESEWD
   THROUGH THE EARLY MORNING WITH THE BEST LOCATIONS TO EXPERIENCE SOME
   SEVERE WEATHER THREAT TO BE ACROSS SERN LA AND EXTREME SERN MS WHERE
   THE ENVIRONMENT REMAINS MOST UNSTABLE.

   ..PETERS.. 05/26/2015


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

   LAT...LON   29499083 30299046 31228993 30718930 30648842 30288842
               29838880 28928917 28638922 28599067 28849157 29499083 

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Page last modified: May 26, 2015
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