MESOSCALE DISCUSSION 0430
   NWS STORM PREDICTION CENTER NORMAN OK
   0236 PM CDT THU APR 22 2004
   
   AREAS AFFECTED...NRN MS...NWRN AL...EXTREME SCNTRL TN
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 221936Z - 222130Z
   
   ...ISOLATED SUPERCELLS WILL MOVE ACROSS THE REGION...
   
   ISOLATED SUPERCELLS HAVE DEVELOPED WITHIN STRONGER LOW LEVEL
   CONVERGENCE...IMMEDIATELY AHEAD OF OLD MCS OUTFLOW FROM EXTREME
   SCNTRL TN...ARCING SWWD INTO NRN MS.  THERE APPEARS TO BE SOME
   INFLUENCE FROM WEAK WARM ADVECTION BENEATH THE TRAILING END OF
   STRONGER LLJ THAT EXTENDS NEWD ACROSS MIDDLE TN INTO KY.  AT ANY
   RATE...STRONG BOUNDARY LAYER THERMALS DUE TO STEEP LAPSE RATES AND
   SUFFICIENT DEEP LAYER SHEAR EXIST FOR CONTINUED STORM ROTATION AND
   ISOLATED LARGE HAIL/DAMAGING WIND THREAT.  ENVIRONMENTAL PARAMETERS
   SUGGEST AN ISOLATED TORNADO IS POSSIBLE HOWEVER THE PRIMARY SEVERE
   THREATS WILL BE HAIL AND WIND.
   
   OVER THE NEXT FEW HOURS...LLJ WILL INCREASE WEST OF THIS REGION FROM
   SERN TX INTO WRN AR.  THIS MAY LIMIT THE LONGEVITY OF ONGOING
   ACTIVITY AS CONVERGENCE SHIFTS INTO THE ARKLATX REGION.
   
   ..DARROW.. 04/22/2004
   
   
   ATTN...WFO...OHX...BMX...HUN...MEG...JAN...
   
   33559088 34168984 35208788 35258705 34468693 33438850
   33239029