MESOSCALE DISCUSSION 0554
   NWS STORM PREDICTION CENTER NORMAN OK
   1201 PM CDT FRI APR 04 2008
   
   AREAS AFFECTED...CNTRL AND SRN MS THROUGH CNTRL AL
   
   CONCERNING...TORNADO WATCH 164...
   
   VALID 041701Z - 041830Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 164 CONTINUES.
   
   THREAT FOR DAMAGING WIND APPEARS GREATEST WITH LINE OF STORMS MOVING
   INTO W CNTRL AND SW MS NEXT COUPLE HOURS. THE THREAT FOR ISOLATED
   TORNADOES IS ALSO EXPECTED TO INCREASE FROM CNTRL AND SRN MS THROUGH
   CNTRL AL.
   
   LINE OF STORMS EXTENDS FROM NERN AL SWWD THROUGH CNTRL MS...SWD
   ALONG THE MS/LA BORDER THEN SWWD INTO SERN TX. PORTION OF LINE OVER
   WRN MS IS MOVING EAST AT AROUND 50 KT. LOW CLOUDS ARE MIXING OUT
   ALLOWING THE DOWNSTREAM WARM SECTOR TO DESTABILIZE AS TEMPERATURES
   CLIMB TO NEAR 80 ALONG WITH MID 60S DEWPOINTS. VWP DATA SHOW THE
   BOUNDARY LAYER FLOW HAS VEERED TO SSWLY WITH 0-1 KM STORM RELATIVE
   HELICITY FROM 100 TO 150 M2/S2...BUT WITH EFFECTIVE BULK SHEAR FROM
   40 TO 50 KT. THIS WIND PROFILE WILL CONTINUE TO SUPPORT ORGANIZED
   STRUCTURES INCLUDING BOW ECHOES AND SUPERCELLS WITHIN THE LINE WITH
   A THREAT FOR DAMAGING WIND AND ISOLATED TORNADOES. THE 15Z RAOB FROM
   JACKSON MS SHOWED THE THERMODYNAMIC PROFILE BETWEEN 850-700 MB HAS
   COOLED AND MOISTENED...EFFECTIVELY MINIMIZING THE CAPPING INVERSION.
   MOREOVER...RECENT RADAR TRENDS CONFIRM THE CONVECTIVE INHIBITION HAS
   WEAKENED WITH DISCRETE CELLS INCREASING AHEAD OF THE LINE FROM SRN
   MS NEWD THROUGH CNTRL AL. THIS CONVECTION MAY POSE A THREAT FOR
   ISOLATED TORNADOES AND LARGE HAIL IF IT CONTINUES TO INTENSIFY AND
   BECOME BETTER ORGANIZED AS DISCRETE SUPERCELLS.
   
   ..DIAL.. 04/04/2008
   
   
   ATTN...WFO...BMX...MOB...JAN...LIX...
   
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   32368663 31138925 31189132