SPC MESOSCALE DISCUSSION 1823 FOR N CNTRL TX
   CONCERNING...SEVERE THUNDERSTORM WATCH 644...
   
   VALID 271122Z - 271300Z
   
   THREAT FOR PRIMARILY DAMAGING WIND EXPECTED TO PERSIST NEXT FEW
   HOURS OVER N CNTRL TX AS LINE OF SEVERE STORMS CONTINUES SSEWD.
   ACTIVITY WILL MOVE INTO THE DALLAS/FORT WORTH METRO AREA AROUND
   12Z.
   
   LINE OF STORMS WITH A HISTORY OF STRONG-DAMAGING WIND GUSTS EXTENDS
   FROM STEPHENS COUNTY IN N CNTRL TX NEWD INTO EXTREME S CNTRL OK.
   ACTIVITY IS MOVING SSEWD AT 35 TO 40 KT. SOME WWD DEVELOPMENT INTO
   PARTS OF NWRN TX HAS BEEN OBSERVED RECENTLY. HOWEVER...RADAR DATA
   SHOW THAT WRN PART OF THE LINE CONTINUES TO STRUGGLE DUE TO
   STRONGER CAP. FARTHER E FROM N CNTRL TX INTO EXTREME SRN OK...MCS
   REMAINS WELL ORGANIZED WITH STRONG REAR INFLOW JET AND SSWLY LOW
   LEVEL JET MAINTAINING FAVORABLE INFLOW/CONVERGENCE ALONG LEADING
   GUST FRONT. THERE IS SOME CONCERN THAT THE ERN PARTS OF THE LINE
   MAY CONTINUE ON A MORE SEWD COURSE ALONG THE INSTABILITY GRADIENT
   FROM NEAR DFW SEWD TO NEAR LFK. IF THIS TRENDS CONTINUES AND IT
   APPEARS THE LINE WILL REMAIN SEVERE FOR SEVERAL MORE HOURS...
   ANOTHER WW MIGHT WOULD BE NEEDED E/SE OF WW 644. 
   
   ..DIAL.. 08/27/02