MESOSCALE DISCUSSION 0530
   NWS STORM PREDICTION CENTER NORMAN OK
   0152 AM CDT FRI APR 19 2013
   
   AREAS AFFECTED...S CENTRAL AND SERN KY/MIDDLE AND ERN TN/NERN
   AL/NWRN GA
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 190652Z - 190815Z
   
   PROBABILITY OF WATCH ISSUANCE...40 PERCENT
   
   SUMMARY...LOW-END WIND/BRIEF/ISOLATED TORNADO POTENTIAL REMAINS
   PRESENT ACROSS THE DISCUSSION AREA.  WW MAY BE REQUIRED.
   
   DISCUSSION...LATEST RADAR TRENDS REVEAL SOME
   INTENSIFICATION/SHARPENING OF A LONG-LIVED/FORCED LINE OF CONVECTION
   MOVING EWD ACROSS THE MID SOUTH REGION.  HOWEVER...DOWNWARD
   LIGHTNING TRENDS OVER THE PAST FEW HOURS CONFIRM OBJECTIVE ANALYSES
   REVEALING LIMITED/RELATIVELY SHALLOW INSTABILITY.  THESE
   THERMODYNAMIC LIMITATIONS WOULD SUGGEST LITTLE THREAT FOR
   APPRECIABLE INCREASE IN SEVERE POTENTIAL.
   
   HAVING SAID THAT...DEEP-LAYER WIND FIELD REMAINS QUITE STRONG...WITH
   VEERING/RAPIDLY INCREASING FLOW WITH HEIGHT TO IN EXCESS OF 50 KT AT
   1.5 KM AND 70 KT AT 3 KM PER AREA VAD WIND PROFILES.  THIS DEGREE OF
   SHEAR WITHIN AN ENVIRONMENT CURRENTLY SUPPORTING AN ORGANIZED
   CONVECTIVE LINE SUGGESTS THAT THREAT FOR DAMAGING WIND GUSTS OR A
   BRIEF TORNADO REMAINS NON-ZERO -- PARTICULARLY WITHIN A CUSP ALONG
   THE CONVECTIVE LINE.  THUS...WE WILL CONTINUE TO MONITOR
   ENVIRONMENTAL AND CONVECTIVE TRENDS FOR POSSIBLE WW ISSUANCE.
   
   ..GOSS/CORFIDI.. 04/19/2013
   
   
   ATTN...WFO...MRX...JKL...FFC...LMK...OHX...BMX...HUN...
   
   LAT...LON   33418522 33028623 33308718 34118684 36058644 37138634
               37338516 37338415 36228378 34018462 33418522