MESOSCALE DISCUSSION 0519
   NWS STORM PREDICTION CENTER NORMAN OK
   0302 PM CDT SUN APR 20 2003
   
   AREAS AFFECTED...NRN/WRN MS...SERN AR...NRN/WRN LA
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 202002Z - 202300Z
   
   TSTMS EXPECTED TO INCREASE IN COVERAGE ALONG AND WITHIN
   APPROXIMATELY 80 NM AHEAD OF SFC COLD FRONT -- FROM NRN MS SWWD
   ACROSS NWRN LS.  MEANWHILE...FORWARD-PROPAGATING MULTICELL
   CLUSTERS WILL MOVE EWD FROM SERN TX INTO SWRN LA.  SPORADIC
   DAMAGING WIND AND HAIL ARE POSSIBLE THROUGH THIS REGION...HOWEVER
   THREAT DOES NOT APPEAR CONCENTRATED ENOUGH FOR WW ATTM.
   
   LOW-MIDLEVEL WIND PROFILES AND SHEAR GENERALLY WEAKEN WITH SWWD
   EXTENT THROUGH DISCUSSION AREA. FRONT IS NEARLY PARALLEL TO...AND
   WILL MOVE OUT FROM BENEATH...SERN PERIPHERY OF STRONGEST
   UPPER-TROPOSPHERIC WIND PROFILES.  HOWEVER...ORGANIZED MULTICELL
   STORM STRUCTURES REMAIN POSSIBLE WITH LINEAR ALIGNMENT OF
   ACTIVITY NEAR FRONT...ALONG WITH BRIEF BOWS.  MODIFIED RAOBS AND
   RUC2 FORECAST SOUNDINGS SUGGEST 1000-1500 J/KG MLCAPE OVER MOST
   OF AREA.  SOMEWHAT MORE DEEPLY MIXED BOUNDARY LAYERS EVIDENT OVER
   SRN LA -- WITH TEMPS WELL INTO 80S AND 15-20 DEG DEW POINT
   DEPRESSIONS -- MAY SUPPORT ENHANCED SFC OUTFLOW STRENGTH WITH
   TSTMS MOVING EWD ACROSS AREA FROM SE TX.
   
   ..EDWARDS.. 04/20/2003
   
   
   ATTN...WFO...HUN...MEG...JAN...LIX...LZK...LCH...SHV...
   
   29789370 31429374 32729323 35008987 35008816 32938988
   31579179 30669161 29519156