MESOSCALE DISCUSSION 0687
   NWS STORM PREDICTION CENTER NORMAN OK
   0810 PM CDT SUN MAY 01 2011
   
   AREAS AFFECTED...EXTREME NERN TX...EXTREME NWRN LA...SRN AR
   
   CONCERNING...TORNADO WATCH 262...
   
   VALID 020110Z - 020145Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 262 CONTINUES.
   
   VALID PORTION OF TORNADO WATCH 262 IS SET TO EXPIRE AT 02Z. ANOTHER
   WW IS NOT EXPECTED.
   
   EARLIER ATTEMPTS AT SUSTAINED SFC-BASED SUPERCELL DEVELOPMENT OVER
   NE TX HAVE FAILED OWING TO SURGING COLD FRONT UNDERCUTTING CELLS AND
   MID-TROP WARMING OBSERVED ON 00Z SHV SOUNDING.  BROAD SWLY LLJ WILL
   MAINTAIN THE THREAT FOR REGENERATIVE ELEVATED STORMS FROM NERN TX
   INTO CNTRL/NRN AR THROUGH THE NIGHT.  LACK OF STRONG UPPER SUPPORT
   AND PREVIOUSLY MENTIONED MID-LEVEL WARMING WILL PROBABLY LIMIT
   SFC-BASED STORM AND TORNADO POTENTIALS THE REMAINDER OF THE NIGHT.
   ANY ELEVATED STORM CLUSTERS RIDING CLOSER TO THE QUASISTATIONARY
   FRONT ACROSS SRN AR MAY GIVE LOCAL DMGG WIND AND HAIL THREATS...BUT
   TRAINING VERY HEAVY RAINFALL/FLASH FLOODING APPEAR TO BE A SUPERIOR
   RISKS.
   
   ..RACY.. 05/02/2011
   
   
   ATTN...WFO...MEG...JAN...LZK...SHV...FWD...
   
   LAT...LON   34039074 32039360 31749419 31759499 32169568 32549583
               32919569 33459493 33949400 34399315 34899222 35399102
               35699042 35708965 35328932 34748949 34039074