MESOSCALE DISCUSSION 2091
   NWS STORM PREDICTION CENTER NORMAN OK
   0639 AM CDT THU SEP 01 2011
   
   AREAS AFFECTED...NRN MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 820...
   
   VALID 011139Z - 011215Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 820
   CONTINUES.
   
   WW 820 WILL BE ALLOWED TO EXPIRE AT 12Z...AND A NEW WW ISSUANCE IS
   UNLIKELY AT THIS TIME.
   
   AN ISOLATED SEVERE WEATHER THREAT REMAINS ACROSS THE ERN EXTENT OF
   WW 820 ACROSS NORTH CENTRAL MN /CLEARWATER AND BELTRAMI COUNTIES/
   AND INTO ADJACENT COUNTIES OF NRN CASS TO KOOCHICHING. 
   HOWEVER...EVEN THIS THREAT APPEARS TO BE WANING PER A DECREASING
   TREND IN LIGHTNING STRIKES AND WARMING CLOUD TOPS ALONG THE
   ATTENDANT SRN PERIPHERY OF THE MCS CONVECTIVE CLOUD/PRECIPITATION
   SHIELD ADVANCING EWD ACROSS NRN MN EARLY THIS MORNING.
   
   LOW LEVEL WAA SHOULD GRADUALLY WEAKEN ACROSS MUCH OF NORTH
   CENTRAL-NERN MN AS THE SWLY LLJ ALSO DECREASES IN SPEED.  THIS
   ASCENT COMBINED WITH DIFFLUENT FLOW REGIME ALOFT OVER NRN MN WILL
   PROVIDE SUFFICIENT DEEP LAYER UVVS FOR CONTINUED SHOWERS/TSTMS THIS
   MORNING.  HOWEVER...WEAKENING WAA/INSTABILITY SUGGEST A LOWER
   POTENTIAL FOR THE DEVELOPMENT OF MORE ROBUST UPDRAFTS AND SUBSEQUENT
   SEVERE WEATHER THREAT.
   
   ..PETERS.. 09/01/2011
   
   
   ATTN...WFO...DLH...FGF...
   
   LAT...LON   47169533 47689559 48139546 48489421 48439322 47709327
               46949397 46579457 46569507 47169533