MESOSCALE DISCUSSION 1661
   NWS STORM PREDICTION CENTER NORMAN OK
   0724 PM CDT THU AUG 12 2010
   
   AREAS AFFECTED...SERN MT - NERN WY - WRN SD
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 130024Z - 130230Z
   
   ISOLATED SEVERE THUNDERSTORMS HAVE DEVELOPED ALONG THE MT/WY BORDER
   WITHIN MOIST UPSLOPE FLOW AHEAD OF UPPER LOW.  WV IMAGERY CLEARLY
   DEPICTS THIS MID LEVEL FEATURE EJECTING NEWD ACROSS NCNTRL WY TOWARD
   THE WRN DAKOTAS.  GIVEN THE LARGE SCALE SUPPORT ASSOCIATED WITH THIS
   CONVECTION...AND MORE THAN ADEQUATE INSTABILITY...IT APPEARS THIS
   ACTIVITY MAY BE SUSTAINED WELL INTO THE EVENING HOURS AS IT
   PROGRESSES INTO NWRN SD.  LARGE HAIL SHOULD BE THE PRIMARY SEVERE
   THREAT BEFORE GRADUAL WEAKENING OCCURS WITH LOSS OF DAYTIME HEATING.
   
   ..DARROW.. 08/13/2010
   
   
   ATTN...WFO...UNR...BYZ...
   
   LAT...LON   45480408 45120212 44300228 44290359 44760574 45100677
               45550626 45480408