MESOSCALE DISCUSSION 1925
   NWS STORM PREDICTION CENTER NORMAN OK
   0926 PM CDT TUE AUG 09 2011
   
   AREAS AFFECTED...PORTIONS SERN WY...SRN PANHANDLE OF NEB...SWRN
   NEB...NWRN KS...NERN CO.
   
   CONCERNING...TORNADO WATCH 754...
   
   VALID 100226Z - 100330Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 754 CONTINUES.
   
   SVR CONVECTION OVER SERN PORTIONS WW...BETWEEN HLC-MCK...WILL MOVE
   SEWD INTO WW 759...BUT NOT ENTIRELY BEFORE EXPIRATION OF WW 759. 
   ISOLATED SVR TSTM ALSO IS MOVING SEWD OVER BANNER COUNTY NEB WITH
   ADDITIONAL DEVELOPMENT OCCURRING FARTHER W IN SERN WY.  ANOTHER WW
   MAY BE REQUIRED OVER PORTIONS OF THIS AREA BEFORE SCHEDULED 03Z
   EXPIRATION OF WW 754.
   
   SFC MESOANALYSIS SHOWS STG OUTFLOW BOUNDARY EXTENDING WWD FROM
   GROWING MCS NEAR RSL...ACROSS LANE COUNTY KS...THEN WNWWD NEAR ITR
   AND NRN PORTIONS LINCOLN/DOUGLAS COUNTIES CO...MOVING SWD 10-15 KT
   ACROSS ERN CO.  SUBSTANTIAL ELY/UPSLOPE COMPONENT OF LOW-LEVEL WINDS
   WILL PERSIST BEHIND THIS BOUNDARY OVER NERN CO.  NRN PORTION OF
   RELATED OUTFLOW POOL IS MORE ILL-DEFINED...BUT APPEARS TO BLEND WITH
   AIR MASS ADVECTING SWWD TOWARD REGION BEHIND SYNOPTIC COLD FRONT
   THAT IS ANALYZED OVER ERN KS.  SVR TSTM MOVING SEWD FROM WY INTO WRN
   NEB PANHANDLE MAY PRODUCE DAMAGING HAIL/GUSTS...BUT WILL MOVE INTO
   AIR MASS CHARACTERIZED BY PROGRESSIVELY LOWER THETAE AND GREATER
   MLCINH WITH TIME...RELATED BOTH TO CAA AND TO DIABATIC SFC COOLING. 
   THIS TREND INDICATES CONVECTION MAY WEAKEN...THOUGH TIMING IS
   UNCERTAIN GIVEN EXISTENCE OF WELL-DEVELOPED/MATURE MESOCYCLONE AND
   PROBABLY ROBUST STORM-SCALE COLD POOL TO FORCE ASCENT THROUGH
   STABLE/NEAR-SFC LAYER FOR AT LEAST ANOTHER HOUR OR TWO.  ADDITIONAL
   DEVELOPMENT ALSO MAY OCCUR ATOP OUTFLOW POOL IN ZONE OF ELEVATED WAA
   ACROSS NERN CO AND SWRN NEB.
   
   ..EDWARDS.. 08/10/2011
   
   
   ATTN...WFO...GID...LBF...GLD...BOU...CYS...
   
   LAT...LON   41540507 41880443 41990330 41840160 41140063 40109988
               39309980 39260182 39760380 40100477 41540507