MESOSCALE DISCUSSION 1743
   NWS STORM PREDICTION CENTER NORMAN OK
   0933 PM CDT MON JUL 25 2011
   
   AREAS AFFECTED...SD...NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 684...
   
   VALID 260233Z - 260330Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 684
   CONTINUES.
   
   BUT THE THREAT IS DIMINISHING...AND A NEW WW IS NOT ANTICIPATED.
   
   BENEATH A FAIRLY WARM LOWER/MID TROPOSPHERIC AIR MASS...INCREASING
   INHIBITION WITH BOUNDARY LAYER COOLING HAS BEEN SUFFICIENT TO
   CONTRIBUTE TO SUBSTANTIAL WEAKENING OF CONVECTION DURING THE PAST 1
   TO 2 HOURS.  IT MAY NOT BE OUT OF THE QUESTION THAT ENHANCED
   CONVERGENCE NEAR THE INTERSECTION OF THE SLOWLY EASTWARD ADVANCING
   OUTFLOW AND THE STALLED SURFACE FRONT COULD STILL SUPPORT OCCASIONAL
   INTENSIFYING STORM DEVELOPMENT SOUTH OF PIERRE THROUGH THE SIOUX
   FALLS AREA THROUGH 05-07Z.  HOWEVER...GIVEN THE WEAK DEEP LAYER MEAN
   FLOW...POTENTIAL FOR STRONG DAMAGING WIND GUSTS PROBABLY WILL
   CONTINUE TO DIMINISH WITH FURTHER BOUNDARY LAYER COOLING.
   
   ..KERR.. 07/26/2011
   
   
   ATTN...WFO...FSD...ABR...
   
   LAT...LON   44850040 44859955 44789800 44769683 44269637 43779661
               43919824 43790012 44280008 44850040