MESOSCALE DISCUSSION 0718
   NWS STORM PREDICTION CENTER NORMAN OK
   0914 PM CDT TUE MAY 05 2009
   
   AREAS AFFECTED...NCNTRL TX
   
   CONCERNING...TORNADO WATCH 247...
   
   VALID 060214Z - 060245Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 247 CONTINUES.
   
   SUPERCELL STORM THAT PRODUCED 4-5 INCH HAILSTONES WAS DIMINISHING N
   OF STEPHENSVILLE TX AT 02Z.  AIR MASS HAS BECOME INCREASINGLY CAPPED
   AS THE BOUNDARY LAYER COOLS.  THE THREAT FOR ADDITIONAL SFC-BASED
   STORMS THROUGH THE REMAINDER OF THE EVENING APPEARS MINIMAL ACROSS
   THE BIG COUNTRY/NCNTRL TX.
   
   AFTER PERUSAL OF THE EVENING UPR AIR CHARTS AND INCOMING 00Z MODEL
   DATA...EXPECTATION FOR ADDITIONAL STORM DEVELOPMENT CONTINUES ACROSS
   NRN TX AND CNTRL/SRN OK...BUT TIMING OF THE PRIMARY EVENT REMAINS
   UNCERTAIN.  SWLY LLJ WAS BEGINNING TO STRENGTHEN PER VWP/PROFILERS
   AND WILL PRODUCE CONSIDERABLE UPGLIDE ALONG/N OF THE E-W BAROCLINIC
   ZONE RESIDING ACROSS N TX.  CONVECTION SEEMS TO BE BACKBUILDING WSW
   FROM ELEVATED TSTMS IN ERN OK/AR TOWARD SWRN OK.  SOME OF THIS
   ACTIVITY MAY DEEPEN/GROW STRONGER WITH TIME INTO THE LLJ AXIS WITH
   TIME.  ANOTHER SCENARIO WOULD BE FOR NEW TSTM DEVELOPMENT TO OCCUR
   ACROSS WRN OK/WRN N TX LATER THIS EVENING.  WHATEVER THE CASE...ANY
   NEW DEVELOPMENT OVERNIGHT WILL RUN THE RISK FOR AT LEAST LARGE HAIL.
   
   ..RACY.. 05/06/2009
   
   
   ATTN...WFO...FWD...OUN...SJT...LUB...
   
   LAT...LON   32810043 34129935 33109702 31219776 31359995 31930028
               32810043