MESOSCALE DISCUSSION 0720
   NWS STORM PREDICTION CENTER NORMAN OK
   1103 PM CDT TUE MAY 05 2009
   
   AREAS AFFECTED...SRN OK...NRN TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 060403Z - 060600Z
   
   WATER VAPOR IMAGERY AND PROFILER PLOTS INDICATE THAT IN ADDITION TO
   THE VORT MAX MOVING EWD THROUGH NCNTRL TX...A SUBTLE MID-LEVEL WAVE
   WAS EMERGING ACROSS NERN NM/WRN TX PNHDL.  LATTER FEATURE IS FCST TO
   TRANSLATE INTO THE RED RVR VLY LATER TONIGHT WITH A CONCOMITANT
   INCREASE IN THE SWLY LLJ OVER CNTRL TX.  INCREASING ISENTROPIC
   ASCENT ALONG/N OF THE W-E WRMFNT SITUATED ACROSS N TX INVOF I-20
   WILL LIKELY CONTRIBUTE TO INCREASING BANDS/CLUSTERS OF ELEVATED
   TSTMS ACROSS SRN OK AND NRN TX LATER TONIGHT...PROBABLY AFTER
   06-08Z.  SRN EDGE TO THE SVR RISK WILL LIKELY RESIDE ALONG/N OF I-20
   ALONG THE PERIPHERY OF STRONGER CINH.
   
   00Z OUN/FWD SOUNDINGS EXHIBITED VERY STEEP LAPSE RATES FROM H7-H5
   AND BUOYANT LAYER SHEAR SHOULD SUPPORT ROTATING UPDRAFTS YIELDING
   LARGE HAIL...POSSIBLY GREATER THAN GOLFBALL SIZE.  HOWEVER...VERY
   LATE TONIGHT...AS STORM NUMBER INCREASES AND A LARGER SCALE COLD
   POOL CAN EVOLVE...ANY NEW TSTM DEVELOPMENT CLOSER TO THE WRMFNT IN
   THE RED RVR VLY/N TX WILL INCREASE THE RISK FOR DMGG WIND GUSTS.
   
   A SEVERE TSTM WATCH WILL BE POSSIBLE FOR PORTIONS OF THE
   REGION...GENERALLY ALONG/N OF I-20 NWD INTO PARTS OF SRN OK IN THE
   NEXT 2-3 HOURS.
   
   ..RACY.. 05/06/2009
   
   
   ATTN...WFO...TSA...FWD...OUN...
   
   LAT...LON   33619544 33099618 32989709 32999804 33059851 33069864
               33789929 34179928 34589834 35029699 35169595 35059503
               33619544