MESOSCALE DISCUSSION 1601
   NWS STORM PREDICTION CENTER NORMAN OK
   0817 PM CDT TUE JUL 12 2011
   
   AREAS AFFECTED...PARTS OF CENTRAL AND NRN MT
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 637...
   
   VALID 130117Z - 130215Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 637
   CONTINUES.
   
   OBJECTIVE ANALYSES SHOWED A CORRIDOR OF MODERATE INSTABILITY /MLCAPE
   1500-2000 J PER KG/ EXTENDING FROM WRN TO NORTH CENTRAL MT WITH THIS
   SAME REGION COINCIDENT WITH THE STRONGEST EFFECTIVE BULK SHEAR OF
   35-45 KT.  ANY NEW STORMS AND EXISTING ACTIVITY WILL CONTINUE TO
   HAVE SOME POTENTIAL TO BECOME SEVERE GIVEN THE AVAILABLE
   INSTABILITY...SHEAR AND MIDLEVEL LAPSE RATES OF 7-8 C/KM....OVER WRN
   AND NRN MT.  MEANWHILE...EXTENSIVE CLOUDINESS PER VISIBLE IMAGERY
   ACROSS MUCH OF WW 637 AND LOW LEVEL STREAMLINE ANALYSIS INDICATING
   THE BEST LOW LEVEL CONVERGENCE WAS LOCATED OVER THE NRN EXTENT OF
   THIS WATCH...THE OVERALL SEVERE WEATHER THREAT WITH SWD EXTENT INTO
   SWRN MT/E CENTRAL ID WILL REMAIN LOW THIS EVENING.
   
   ..PETERS.. 07/13/2011
   
   
   ATTN...WFO...GGW...TFX...MSO...
   
   LAT...LON   49000825 47660867 46810895 46841040 46931150 46861235
               46421289 45981397 47061450 48081292 49041217 49000825