MESOSCALE DISCUSSION 1648
   NWS STORM PREDICTION CENTER NORMAN OK
   0327 PM CDT TUE JUL 13 2004
   
   AREAS AFFECTED...NERN CO...SW NEB...SE WY
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 132027Z - 132300Z
   
   SEVERE THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING ACROSS
   NERN CO...SW NEB...AND SE WY.  A WATCH MAY BE NEEDED ACROSS THE
   REGION WITHIN 2 HOURS.
   
   AIRMASS IS BECOMING VERY UNSTABLE ACROSS THE REGION AS MLCAPE VALUES
   EXCEED 2500 J/KG FROM THE SOUTHERN NEB PANHANDLE SOUTHEASTWARD TO SW
   NEB.  THUNDERSTORMS THAT HAVE INITIATED ON THE LARAMIE
   MOUNTAINS...AND ADDITIONAL CUMULUS DEVELOPMENT AHEAD OF THESE
   STORMS...WILL BE MOVING INTO THE REGION.  GIVEN THE VERY TO
   EXTREMELY UNSTABLE AIRMASS AND 0-6 KM SHEAR VALUES APPROACHING 30
   KNOTS...ANY THUNDERSTORMS THAT DEVELOP IN THIS ENVIRONMENT ARE
   LIKELY TO RAPIDLY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS
   THE MAIN THREAT.
   
   ..LEVIT.. 07/13/2004
   
   
   ATTN...WFO...GID...LBF...GLD...BOU...CYS...
   
   42360490 41690533 40870488 40180271 40080117 40390035
   40820019 41440075 42000199 42260325