MESOSCALE DISCUSSION 0568
   NWS STORM PREDICTION CENTER NORMAN OK
   1046 AM CDT MON APR 25 2011
   
   AREAS AFFECTED...NORTH-CENTRAL/NORTHEAST TX AND SOUTHEAST OK TO
   SOUTHERN AR/NORTHWEST LA
   
   CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY 
   
   VALID 251546Z - 251645Z
   
   A SURFACE BASED SEVERE THREAT IS EXPECTED TO STEADILY INCREASE INTO
   THE AFTERNOON...INITIALLY ACROSS NORTH-CENTRAL/NORTHEAST TX INTO
   SOUTHERN OK INCLUDING AREAS ALONG/AHEAD OF I-35. A TORNADO WATCH
   WILL BE ISSUED SOON.
   
   WHILE LOW LEVEL COVER CONTINUES TO REMAIN AND HINDER SURFACE HEATING
   TO A DEGREE...THE 12Z OBSERVED SOUNDING FROM DALLAS-FORT WORTH WAS
   ALREADY INDICATIVE OF VERY LITTLE INHIBITION. AIDED BY A PROMINENT
   SOUTHERN PLAINS UPPER TROUGH AND ATTENDANT ADVANCING COLD
   FRONT/MODESTLY EASTWARD0ACCELERATING DRYLINE...FURTHER
   DESTABILIZATION WILL CONTINUE TO OCCUR INTO THE AFTERNOON WITH AN
   UPSWING IN DEEP CONVECTIVE COVERAGE/INTENSITY ANTICIPATED. GIVEN
   VERY STEEP LAPSE RATES ALOFT/FAVORABLE VERTICAL SHEAR...INITIAL
   MODAL SUPERCELLS CAPABLE OF VERY LARGE HAIL/TORNADOES ARE PROBABLE
   ESPECIALLY WITH SEMI-DISCRETE PRE-COLD FRONTAL/DRYLINE
   DEVELOPMENT...ALTHOUGH DAMAGING WINDS MAY BECOME A CONSIDERABLE
   CONCERN AS WELL AS STORMS CONGEAL/INCREASE ALONG THE ADVANCING
   FRONT.
   
   ..GUYER.. 04/25/2011
   
   
   ATTN...WFO...LZK...SHV...TSA...HGX...FWD...OUN...
   
   LAT...LON   31599798 33239740 34949652 35049504 33919346 32029343
               30599626 31599798