MESOSCALE DISCUSSION 0915
   NWS STORM PREDICTION CENTER NORMAN OK
   0922 PM CDT MON MAY 23 2011
   
   AREAS AFFECTED...W-CNTRL THROUGH CNTRL AND ERN OK
   
   CONCERNING...TORNADO WATCH 345...348...
   
   VALID 240222Z - 240245Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 345...348...CONTINUES.
   
   PRIMARY THREATS APPEAR TO HAVE TRANSITIONED TO DAMAGING WIND AND
   LARGE HAIL. WW 345 IS SCHEDULED TO EXPIRE AT 03Z. ONE OPTION IS TO
   REPLACE BOTH 345 AND 348 BY A SINGLE SEVERE THUNDERSTORM WATCH PRIOR
   TO 03Z.
   
   STORMS SHOULD CONTINUE DEVELOPING WITHIN ZONE OF ISENTROPIC LIFT
   NORTH OF CONVECTIVE OUTFLOW BOUNDARY SUPPORTED BY A SLY LLJ. STORMS
   HAVE BEEN BACKBUILDING ALONG THE WRN PORTION OF THE BOUNDARY AND
   HAVE MAINTAINED SUPERCELL STRUCTURES...WHILE STORMS IN ERN OK HAVE
   BECOME FORWARD PROPAGATING. AN ISOLATED TORNADO CANNOT BE RULED
   OUT...BUT CURRENT THINKING IS THAT STORMS WILL REMAIN AT LEAST
   SLIGHTLY ELEVATED ON COOL SIDE OF THE BOUNDARY WITH THREAT FOR
   MAINLY LARGE HAIL AND DAMAGING WIND.
   
   ..DIAL.. 05/24/2011
   
   
   ATTN...WFO...TSA...OUN...
   
   LAT...LON   36209839 36099580 35909457 35109486 34879551 35339794
               35689864 36209839