MESOSCALE DISCUSSION 0908
   NWS STORM PREDICTION CENTER NORMAN OK
   0618 PM CDT MON MAY 23 2011
   
   AREAS AFFECTED...NRN AR
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 343...
   
   VALID 232318Z - 240045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 343
   CONTINUES.
   
   STORMS WILL CONTINUE DEVELOPING ACROSS NRN AR THROUGH MID EVENING.
   THREAT WILL PERSIST FOR ISOLATED DAMAGING WIND AND HAIL...MAINLY
   OVER THE SWRN HALF OF WW 345. 
   
   ISENTROPIC LIFT AND MOIST UNSTABLE INFLOW RESULTING FROM A
   PERSISTENT 40 KT SWLY LLJ WILL CONTINUE TO PROMOTE THUNDERSTORM
   DEVELOPMENT OVER NRN AR...ALONG AND NORTH OF CONVECTIVE OUTFLOW
   BOUNDARY. TENDENCY HAS BEEN FOR STORMS TO REMAIN ON THE COOL SIDE
   WHERE THEY MAY BE SLIGHTLY ELEVATED. HOWEVER...RECENT RADAR TRENDS
   INDICATE NUMEROUS STORM MERGERS IN THE PROCESS OF DEVELOPING FROM
   NERN OK INTO SWRN MO AND EXTREME NWRN AR. THIS ACTIVITY MIGHT
   EVENTUALLY ORGANIZE INTO A FORWARD PROPAGATING MCS AND ADVANCE ESEWD
   ON THE COOL SIDE OF THE BOUNDARY. IF THIS OCCURS...THE THREAT FOR
   DAMAGING WIND WOULD INCREASE LATER THIS EVENING.
   
   ..DIAL.. 05/23/2011
   
   
   ATTN...WFO...MEG...LZK...
   
   LAT...LON   36379278 35919124 35918976 35308999 34889085 35089230
               35899303 36379278