MESOSCALE DISCUSSION 0887
   NWS STORM PREDICTION CENTER NORMAN OK
   0736 PM CDT THU MAY 28 2009
   
   AREAS AFFECTED...PART OF SW AND CENTRAL TX
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 290036Z - 290130Z
   
   ISOLATED SEVERE HAIL AND STRONG WIND GUSTS WILL REMAIN POSSIBLE INTO
   THE EVENING...PRIOR TO BOUNDARY LAYER STABILIZATION WITH LOSS OF DAY
   TIME HEATING.
   
   EARLY EVENING VISIBLE IMAGERY/SURFACE OBSERVATIONS INDICATED A
   BOUNDARY EXTENDING FROM SW TX...S OF GDP...EWD TO S OF MAF AND THEN
   SEWD INTO SOUTH CENTRAL TX.  CONVERGENCE ALONG THIS BOUNDARY AND
   OTHER CONVECTIVE OUTFLOW BOUNDARIES WILL BE THE PRIMARY FOCI FOR
   ADDITIONAL TSTM DEVELOPMENT THIS EVENING.  OBJECTIVE ANALYSES
   INDICATED MODERATE INSTABILITY EXTENDED FROM VICINITY OF MAF TO ABI
   AND ALSO INTO SOUTH CENTRAL TX.  DESPITE WEAK ESELY LOW LEVEL
   WINDS...STRONGER MID-UPPER LEVEL WLY FLOW PER AREA WSR-88D VWPS AND
   WIND PROFILERS IS SUPPORTING 30-40 KT OF EFFECTIVE BULK SHEAR. 
   FORCING FOR ASCENT ATTENDANT TO A WEAK SRN STREAM IMPULSE SHEARING
   EWD FROM SERN NM/FAR SW TX THIS EVENING AND ALONG SRN PERIPHERY OF
   UPPER TROUGH TRANSLATING ACROSS SRN PLAINS SHOULD AID IN ADDITIONAL
   TSTM DEVELOPMENT THROUGH MID EVENING.  STEEP LAPSE RATES/MODERATE
   INSTABILITY AND EFFECTIVE SHEAR UP TO 40 KT WILL FAVOR LARGE
   HAIL...BUT GRADUAL WEAKENING OF INSTABILITY SHOULD PROMOTE A
   CONTINUED ISOLATED THREAT.
   
   ..PETERS.. 05/29/2009
   
   
   ATTN...WFO...FWD...EWX...SJT...MAF...
   
   LAT...LON   31310312 31870291 32240198 32210064 32589905 32319872
               31599850 31139857 30609852 29939823 28769826 29019927
               30080047 30680146 30970271 31310312