MESOSCALE DISCUSSION 1869
   NWS STORM PREDICTION CENTER NORMAN OK
   0732 PM CDT FRI AUG 05 2011
   
   AREAS AFFECTED...ERN MT/NERN WY/NWRN SD/SWRN ND
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 730...
   
   VALID 060032Z - 060200Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 730
   CONTINUES.
   
   STORMS CONTINUE TO MOVE QUICKLY EWD ACROSS SERN MT AND
   VICINITY...WITH SOME CLOUD-TOP COOLING NOTED IN MOST RECENT IR
   IMAGERY.  EXPECT STORMS TO REMAIN CAPABLE OF PRODUCING LOCALLY
   DAMAGING WINDS IN THE NEXT 1-2 HOURS.
   
   WITH THE COMING ONSET OF DIURNAL COOLING...AND SOME MODIFICATION OF
   THE BOUNDARY LAYER AIRMASS AHEAD OF THESE STORMS BY PRIOR
   CONVECTION...THREAT FOR SEVERE WEATHER MAY BEGIN TO DIMINISH AS WW
   730 APPROACHES ITS SCHEDULED 06/02Z EXPIRATION.  HOWEVER...GIVEN THE
   RATHER POTENT UPPER SYSTEM...POTENTIAL FOR STORMS TO REMAIN ROBUST
   BEYOND THE WATCH EXPIRATION TIME DOES EXIST.  WE WILL THUS CLOSELY
   MONITOR CONVECTIVE EVOLUTION IN THE NEXT 1-2 HOURS...AND ANY
   ASSOCIATED NEED FOR WW EXTENSION/NEW WATCH ISSUANCE.
   
   ..GOSS.. 08/06/2011
   
   
   ATTN...WFO...BIS...UNR...BYZ...
   
   LAT...LON   44720314 44260427 45120669 46030805 46510844 46460381
               44720314