MESOSCALE DISCUSSION 1201
   NWS STORM PREDICTION CENTER NORMAN OK
   0955 PM CDT SUN JUN 12 2011
   
   AREAS AFFECTED...SD
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 470...
   
   VALID 130255Z - 130400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 470
   CONTINUES.
   
   SQUALL LINE IS PROGRESSING STEADILY EWD ACROSS WW 470 BUT APPEARS TO
   BE GRADUALLY WEAKENING AS LEADING EDGE OF CONVECTION ENCOUNTERS MORE
   HOSTILE AIR MASS OVER CNTR/ERN SD.  IF THIS TREND CONTINUES ACTIVITY
   WILL MOVE OUT OF THE WATCH SHORTLY AFTER 04Z.  WITH GREATER
   INSTABILITY NOW LOCATED ACROSS NEB IT APPEARS STRONGEST UPDRAFTS
   WILL BE ALONG THE SRN/SWRN PORTIONS OF SQUALL LINE.
   
   ..DARROW.. 06/13/2011
   
   
   ATTN...WFO...ABR...BIS...LBF...UNR...
   
   LAT...LON   42890233 45920246 45949955 42909956 42890233