MESOSCALE DISCUSSION 1950
   NWS STORM PREDICTION CENTER NORMAN OK
   0942 PM CDT THU AUG 11 2011
   
   AREAS AFFECTED...SD...NE...MN...IA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 769...
   
   VALID 120242Z - 120345Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 769
   CONTINUES.
   
   MATURE BOW ECHO MOVING SEWD ACROSS THE MISSOURI RIVER VALLEY LATE
   THIS EVENING WILL MOVE THROUGH MOST OF WATCH 769 BEFORE 11 PM CDT.
   APEX OF THE BOWING LINE IS MOVING SEWD AT ABOUT 45KT AND RECENTLY
   OBSERVED WIND GUSTS APPEAR TO CONFIRM THAT WIND SPEEDS OF 35 TO 50KT
   CAN BE EXPECTED WITH THE PASSAGE OF THE SQUALL LINE. DOWNWARD TRENDS
   IN REFLECTIVITY AND LIGHTNING...AND PERHAPS A GRADUAL WARMING IN IR
   CLOUD TOP TEMPERATURES IN THE NERN PORTION OF THE QLCS...SUGGEST A
   SLOW WEAKENING IN THIS PART OF THE SYSTEM. HOWEVER...ABUNDANT
   INSTABILITY AND MODEST ISENTROPIC ASCENT IN THE SWRN/TRAILING
   PORTION OF THE LINE WOULD SUPPORT SOME CONTINUATION OF
   STRONGER/DAMAGING WINDS REACHING THE SURFACE ACROSS PARTS OF ERN NEB
   OVER THE NEXT HOUR OR SO.
   
   ..CARBIN.. 08/12/2011
   
   
   ATTN...WFO...DMX...FSD...OAX...GID...LBF...
   
   LAT...LON   44489855 44479595 43519584 43509536 42199530 42209627
               41539596 41239829 44489855