SPC MESOSCALE DISCUSSION 0751 FOR ...NERN TX/SRN AR/NRN LA...
   CONCERNING...SEVERE THUNDERSTORM WATCH 274...
   
   VALID 100751Z - 101000Z
   
   WE WILL CONTINUE TO MONITOR AREA OF SERN OK...NERN TX...SRN AR AND
   PARTS OF NRN LA FOR AN ADDITIONAL WATCH.
   
   OF CONCERN IS THE BOW ECHO STORM MOVING EWD ACROSS VAN ZANDT INTO
   SMITH COUNTIES IN TX.  THIS STORM LOOKS TO BE MORE SURFACE BASED
   LOCATED ON THE BOUNDARY INTERSECTION BETWEEN THUNDERSTORM OUTFLOW
   AND THE QUASISTATIONARY FRONTAL BOUNDARY.  ACTIVITY IS MOVING ALONG
   INSTABILITY GRADIENT WHERE ELEVATED CAPE NEAR 2000 J/KG EXTENDS EWD
   ALONG THE LA/AR BORDER. MOVEMENT OF THE BOW IS EWD AT 25-30
   KT...BUT IF THE STORM DEVELOPS A STRONGER REAR INFLOW JET AND
   ACCELERATES...THEN AN ADDITIONAL WATCH MAY BE NECESSARY.
   
   REMAINDER OF ACTIVITY REMAINS ELEVATED ACROSS EXTREME N TX ALONG
   THE RED RIVER AND OVER THE SRN HALF OF AR.
   
   ..MCCARTHY.. 05/10/02