SPC MESOSCALE DISCUSSION 0578 FOR...NRN TX...SRN OK...
   CONCERNING...SEVERE THUNDERSTORM WATCH 186...
   
   VALID 300651Z - 300800Z
   
   CONVECTION HAS BEEN DIMINISHING ACROSS NRN TX APPARENTLY AS
   NOCTURNAL INHIBITION STRENGTHENS WITHIN THE WARM SECTOR...AND FOCUS
   FOR ASCENT SHIFTS NWD TO THE COOL SIDE OF THE BOUNDARY AS LLJ AND
   ISENTROPIC LIFT INCREASE. IT IS LIKELY THAT WW 186 WILL BE
   CANCELLED EARLY IF CURRENT TRENDS CONTINUE OVER THE NEXT HOUR.
   
   ..CARBIN.. 04/30/02