MESOSCALE DISCUSSION 0566
   NWS STORM PREDICTION CENTER NORMAN OK
   0723 AM CDT MON APR 25 2011
   
   AREAS AFFECTED...NERN TX...SWRN AR AND NWRN LA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 199...
   
   VALID 251223Z - 251400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 199
   CONTINUES.
   
   THE THREAT FOR ISOLATED DAMAGING WIND AND LARGE HAIL EXPECTED TO
   PERSIST NEXT FEW HOURS WITH GREATEST THREAT ACROSS SRN AR. STORMS
   WILL BEGIN TO SHIFT EAST OF WW 199 BY 14Z...AND WW CAN BE LOCALLY
   EXTENDED FARTHER EAST THROUGH SRN AR IF NECESSARY PRIOR TO THIS
   TIME.
   
   EARLY THIS MORNING A NEAR STATIONARY CONVECTIVELY REINFORCED FRONT
   EXTENDS FROM SRN AR THEN WWD ALONG THE RED RIVER AREA OF TX/OK. LINE
   OF STORMS FROM WRN AR THROUGH NERN TX STRADDLES THIS BOUNDARY AND IS
   MOVING EAST AT 30 KT. THE STRONGER MORE ORGANIZED PART OF LINE IS
   MOVING THROUGH SWRN AR WITH EVIDENCE OF A BOWING SEGMENT...ROTATING
   COMMA HEAD...AS WELL AS A POSSIBLE SUPERCELL NEAR SRN END JUST NORTH
   OF TEXARKANA. A STRONG SLY LLJ WILL PERSIST OVER THE LOWER MS VALLEY
   DOWNSTREAM FROM A PROGRESSIVE SHORTWAVE TROUGH MOVING INTO THE SRN
   HIGH PLAINS. THIS WILL MAINTAIN STRONG STORM RELATIVE INFLOW AND
   CONVERGENCE ALONG LEADING GUST FRONT...LIKELY MAINTAINING A FORWARD
   PROPAGATING MCS.
   
   ..DIAL.. 04/25/2011
   
   
   ATTN...WFO...LZK...SHV...
   
   LAT...LON   33749429 34489380 34849296 34509200 33949201 32949280
               32469360 32269471 32379540 32929532 33419460 33749429