MESOSCALE DISCUSSION 1104
   NWS STORM PREDICTION CENTER NORMAN OK
   0858 PM CDT SAT JUN 13 2009
   
   AREAS AFFECTED...NERN WY...SWRN SD...N-CNTRL NEB
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 401...
   
   VALID 140158Z - 140300Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 401
   CONTINUES.
   
   SCATTERED CONVECTIVE CLUSTERS CONTINUE TO EVOLVE ACROSS ERN WY/SWRN
   SD INTO N-CNTRL NEB. OVERALL SEVERE POTENTIAL APPEARS TO HAVE
   COMMENCED A GRADUAL WEAKENING TREND...ESPECIALLY OVER ERN PORTIONS
   OF THE WW. THIS IS EXPECTED TO CONTINUE THROUGH LATE EVENING...GIVEN
   NOCTURNAL COOLING AND RELATIVELY MODEST HIGH-LEVEL LAPSE RATES
   /SAMPLED BY 00Z LBF AND RAP RAOBS/. IN ADDITION...MORE ROBUST
   LOW-LEVEL WARM/MOIST ADVECTION SHOULD REMAIN FARTHER S OF THE
   REGION. AS SUCH...SEVERE THREAT SHOULD BECOME INCREASINGLY MARGINAL
   WITH TIME.
   
   ..GRAMS.. 06/14/2009
   
   
   ATTN...WFO...ABR...LBF...UNR...CYS...RIW...
   
   LAT...LON   42239909 41929952 41660066 41740228 42360291 43010355
               43520444 43480534 43450603 43980607 44510528 44490368
               44260227 43750080 43049972 42239909