MESOSCALE DISCUSSION 1350
   NWS STORM PREDICTION CENTER NORMAN OK
   0759 PM CDT TUE JUN 21 2011
   
   AREAS AFFECTED...PORTIONS OF WRN/NRN/CNTRL TX
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 534...
   
   VALID 220059Z - 220200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 534
   CONTINUES.
   
   WW 534 MAY NEED TO BE EXTENDED SOON ACROSS PORTIONS OF N-CNTRL TX.
   
   WEST-EAST ORIENTED BAND OF STRONG TO SEVERE TSTMS WAS CENTERED FROM
   REAGAN TO MILLS COUNTIES AS OF 0055Z. IT APPEARS LIKELY THAT FURTHER
   STRENGTHENING OF THE SURFACE COLD POOL SHOULD RESULT IN SEWD
   ACCELERATION OF THIS BAND TOWARDS THE HILL COUNTRY DURING THE NEXT
   2-3 HOURS WITH OVERALL TRANSITION FROM LARGE HAIL TO A SEVERE WIND
   THREAT.
   
   FARTHER W/SW...DESPITE PERSISTENT TCU...CB/S HAVE BEEN RELEGATED
   ALONG THE HIGHER TERRAIN IN BREWSTER COUNTY. MODEST STRENGTHENING OF
   LOW-LEVEL SELYS MAY YET PROVIDE FOR ADDITIONAL TSTM DEVELOPMENT IN
   THIS PORTION OF THE WW DURING THE NEXT 1-2 HOURS.
   
   FARTHER N...A SMALL E/NEWD MOVING TSTM CLUSTER PERSISTS NEAR MWL AS
   A RESULT OF EARLIER SPLITTING CELLS FAVORED BY THE UNIDIRECTIONAL
   WLY WIND PROFILE ABOVE 2 KM IN THE 00Z FWD RAOB. THIS ACTIVITY
   SHOULD CONTINUE TO APPROACH THE METROPLEX AND MAY EVOLVE MORE NEWD
   ALONG QUASI-STATIONARY FRONT THAT ARCS TO AROUND 10 SE GYI...BASED
   ON CU FIELD PRESENTATION PRIOR TO OVERSPREADING CI CANOPY.
   
   ..GRAMS.. 06/22/2011
   
   
   ATTN...WFO...FWD...EWX...SJT...MAF...
   
   LAT...LON   30599712 30089805 29999956 30510118 30030244 29130297
               29280384 30770351 31890151 33489719 33539678 33229657
               31659680 30599712