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Mesoscale Discussion 315
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   MESOSCALE DISCUSSION 0315
   NWS STORM PREDICTION CENTER NORMAN OK
   0652 PM CDT THU MAR 31 2016

   AREAS AFFECTED...AL...MS...FAR SRN TN...

   CONCERNING...TORNADO WATCH 70...72...

   VALID 312352Z - 010045Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 70...72...CONTINUES.

   SUMMARY...ALL SEVERE HAZARDS REMAIN POSSIBLE OVER THE NEXT SEVERAL
   HOURS...WITH THE LONGEST DURATION TORNADO RISK POTENTIALLY CENTERED
   ON NWRN/N-CNTRL AL AND EXTREME SRN TN.

   DISCUSSION...NUMEROUS CELLS ARE ONGOING FROM MIDDLE TN INTO SRN
   MS/AL. OVERALL CONVECTIVE MODE HAS EVOLVED INTO A MIX OF DISCRETE
   SUPERCELLS AND CLUSTERS. WHILE ALL SEVERE HAZARDS ARE POSSIBLE
   WITHIN THIS REGIME...RECENT VWP DATA AT BMX/HTX/MXX HAVE SAMPLED
   SOME BACKING AND STRENGTHENING OF WINDS AOB 1 KM AGL. THIS
   ENLARGEMENT TO THE LOW-LEVEL HODOGRAPH IS YIELDING 0-1 KM SRH AROUND
   250-300 M2/S2. WITH MIDDLE TO UPPER 60S SURFACE DEW POINTS HAVING
   OVERSPREAD ALL BUT NERN AL AS AN EARLIER LARGE-SCALE CONVECTIVE
   OUTFLOW DECAYED...SETUP MAY SUPPORT A COMPARATIVELY LONGER DURATION
   TORNADO RISK ACROSS MOST OF NRN AL INTO LATE EVENING.

   ..GRAMS.. 03/31/2016


   ATTN...WFO...OHX...BMX...HUN...MOB...MEG...JAN...

   LAT...LON   35048798 35258687 35318621 35188588 34478607 33798649
               32958687 32168663 31798698 31708811 31658893 31708968
               31939025 32689005 33248939 33508941 33509014 33829052
               34398988 34918888 35048798 

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