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Mesoscale Discussion 749
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   MESOSCALE DISCUSSION 0749
   NWS STORM PREDICTION CENTER NORMAN OK
   0742 PM CDT SUN MAY 24 2015

   AREAS AFFECTED...PORTIONS OF SERN LA AND SRN/WRN MS

   CONCERNING...TORNADO WATCH 204...

   VALID 250042Z - 250215Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 204 CONTINUES.

   SUMMARY...THE THREAT FOR A BRIEF TORNADO OR TWO...AS WELL AS LOCALLY
   DAMAGING WIND GUSTS MAY PERSIST FOR A FEW HOURS AFTER WW EXPIRATION.
   LOCAL EXTENSION IN TIME MAY BE NECESSARY.

   DISCUSSION...CLUSTERS AND BROKEN BANDS OF STRONG TO LOCALLY SEVERE
   CONVECTION PERSIST ACROSS PORTIONS OF WW 204 THIS EVENING...IN A
   REGIME OF VERY MOIST CONFLUENT FLOW. 1-MIN SUPER RAPID SCAN GOES
   IMAGERY ILLUSTRATES A FEW MORE VIGOROUS UPDRAFTS IN FAR S-CNTRL LA
   AS WELL AS SWRN MS...WHICH ARE BEING AIDED BY AROUND 1000-1500 J/KG
   OF MLCAPE. HOWEVER...WITH STRONGER MID-LEVEL FLOW DEPARTING TO THE
   NORTH AS WELL AS THE ONSET OF MODEST NOCTURNAL COOLING...A GENERAL
   DOWNWARD TREND IN CONVECTIVE INTENSITY IS FORECAST THIS EVENING.
   NONETHELESS...SOME MAINTENANCE OR EVEN SLIGHT ENHANCEMENT OF
   850-700-MB FLOW AND THE PRESENCE OF AMPLE LOW-LEVEL MOISTURE COULD
   EXTEND THE SEVERE THREAT FOR A FEW HOURS AFTER THE CURRENT WW
   EXPIRATION. AS SUCH...LOCAL EXTENSION MAY BE REQUIRED TO ACCOUNT FOR
   SOME THREAT FOR A TORNADO OR TWO...AS WELL AS LOCALLY DAMAGING WINDS
   THIS EVENING.

   ..PICCA.. 05/25/2015


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

   LAT...LON   29679192 33489082 32698978 30398867 28798932 29679192 

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