MESOSCALE DISCUSSION 1467
   NWS STORM PREDICTION CENTER NORMAN OK
   0835 PM CDT MON JUL 06 2009
   
   AREAS AFFECTED...NERN WY/SERN MT
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 557...
   
   VALID 070135Z - 070230Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 557
   CONTINUES.
   
   IR SATELLITE IMAGERY INDICATED COLD CLOUD TOPS WITH TSTMS MOVING EWD
   THROUGH NERN WY/FAR SERN MT THIS EVENING.  AIR MASS REMAINS
   MODERATELY UNSTABLE WITH EFFECTIVE BULK SHEAR VALUES AROUND 40 KT
   SUGGESTING A SEVERE WEATHER THREAT CONTINUES ACROSS WW 557. 
   HOWEVER...SURFACE BASED INHIBITION IS BEGINNING TO INCREASE ACROSS
   THIS REGION PER RECENT TRENDS IN OBJECTIVE ANALYSES GIVEN ONSET OF
   BOUNDARY LAYER COOLING WITH LOSS OF DAYTIME HEATING.  THIS TREND MAY
   TEND TO LIMIT THE EWD EXTENT OF SEVERE STORMS AS ACTIVITY APPROACHES
   SWRN ND/NWRN SD.
   
   ..PETERS.. 07/07/2009
   
   
   ATTN...WFO...BIS...UNR...BYZ...GGW...RIW...
   
   LAT...LON   43550410 43490686 45080669 46310706 46480777 46850781
               46840569 46560506 46650404 43550410