MESOSCALE DISCUSSION 2084
   NWS STORM PREDICTION CENTER NORMAN OK
   0609 PM CDT MON AUG 29 2011
   
   AREAS AFFECTED...E-CNTRL THROUGH SERN MT THROUGH EXTREME NERN WY
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 818...
   
   VALID 292309Z - 300045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 818
   CONTINUES.
   
   THREAT FOR MAINLY ISOLATED DAMAGING WIND AND POSSIBLY SOME HAIL IS
   EXPECTED TO PERSIST ACROSS E-CNTRL THROUGH SERN MT INTO EXTREME NE
   WY THROUGH ABOUT 0030Z OR 01Z...AFTER WHICH STORMS SHOULD BEGIN A
   WEAKENING TREND.
   
   STORMS HAVE EVOLVED INTO A COUPLE OF LINES WITH EMBEDDED BOWING
   SEGMENTS AS WELL AS MARGINAL SUPERCELL STRUCTURES ACROSS E-CNTRL
   THROUGH SERN MT. ACTIVITY IS MOVING EAST AT AROUND 30 KT. THESE
   STORMS ARE DEVELOPING WITHIN A ZONE OF DEEPER ASCENT JUST EAST OF A
   PROGRESSIVE SHORTWAVE TROUGH. THE ACTIVITY WILL CONTINUE THROUGH A
   MODESTLY UNSTABLE ENVIRONMENT 500-1000 J/KG MLCAPE NEXT COUPLE
   HOURS. HOWEVER...SATELLITE AND SURFACE OBSERVATIONS SHOW THAT THE
   BOUNDARY LAYER OVER EXTREME SERN MT HAS BEEN STABILIZED BY OUTFLOW
   FROM CONVECTION IN SD...SUGGESTING STORMS SHOULD WEAKEN AS THEY
   APPROACH THE SD/ND BORDER.
   
   ..DIAL.. 08/29/2011
   
   
   ATTN...WFO...UNR...BYZ...GGW...RIW...
   
   LAT...LON   44480617 45760644 46690702 47320677 46710548 45610460
               43990446 44480617