MESOSCALE DISCUSSION 0597
   NWS STORM PREDICTION CENTER NORMAN OK
   0743 AM CDT MON APR 27 2009
   
   AREAS AFFECTED...W-CNTRL TX INTO THE EDWARDS PLATEAU REGION
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 197...
   
   VALID 271243Z - 271415Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 197
   CONTINUES.
   
   THE POTENTIAL FOR LOCALLY DAMAGING WIND GUSTS AND SOME HAIL
   CONTINUES ACROSS SRN PORTION OF WW AREA.  THIS THREAT MAY BEGIN TO
   DEVELOP S OF WW BETWEEN 1330 AND 1400Z.  A DOWNSTREAM WW MAY BE
   NECESSARY.
   
   AS OF 1230Z...REGIONAL RADAR IMAGERY INDICATED LEADING EDGE OF MCS
   COLD POOL EXTENDING FROM SRN CROCKETT COUNTY EWD ACROSS NRN PORTIONS
   OF SUTTON AND KIMBLE COUNTIES INTO MASON COUNTY.  SYSTEM MOTION WAS
   SEWD AT 25 KT.  12Z DRT SOUNDING INDICATES THAT INFLOW  AIR MASS IS
   QUITE MOIST WITH STEEP LAPSE RATES...CONTRIBUTING TO MUCAPE OF NEAR
   2500 J/KG.  THUS...EXPECT SYSTEM TO GRADUALLY INTENSIFY THIS MORNING
   AS BOUNDARY LAYER WARMS AND FURTHER DESTABILIZES.
   
   VERTICAL SHEAR /ENHANCED BY MIDLEVEL IMPULSE MOVING THROUGH THE BIG
   BEND REGION/ IS SUFFICIENT /40-50 KT THROUGH 6 KM/ TO SUPPORT
   EMBEDDED SUPERCELL/BOWING STRUCTURES WITH THE THREAT FOR DAMAGING
   WINDS AND HAIL.
   
   ..MEAD.. 04/27/2009
   
   
   ATTN...WFO...EWX...SJT...MAF...
   
   LAT...LON   30110131 30840182 31570170 32040124 32120050 31829941
               31229902 30759911 30179947 30060019 30110131