MESOSCALE DISCUSSION 1763
   NWS STORM PREDICTION CENTER NORMAN OK
   0249 AM CDT WED JUL 27 2011
   
   AREAS AFFECTED...SERN SD...SRN AND ERN MN AND PARTS OF WRN WI
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 692...693...
   
   VALID 270749Z - 270845Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   692...693...CONTINUES.
   
   ALTHOUGH AN ISOLATED STRONG TO SEVERE TSTM REMAINS POSSIBLE DURING
   THE OVERNIGHT HOURS ACROSS MAINLY SRN TO EAST CENTRAL MN AND
   POSSIBLY WRN WI...WARMING CLOUD TOP TEMPERATURES AND A STEADY
   DECREASE IN INSTABILITY SUGGEST THE OVERALL SEVERE WEATHER THREAT
   WILL CONTINUE TO DIMINISH IN COVERAGE.
   
   EARLY CANCELLATIONS OF WW 692 AND WW 693 ARE POSSIBLE PRIOR TO 09Z
   AND 11Z...RESPECTIVELY.
   
   SATELLITE AND REGIONAL RADAR IMAGERY SHOWED AN MCS MOVING EWD ACROSS
   ERN/SRN MN INTO WRN WI...WITH THE TRAILING PORTION OF THIS SYSTEM
   EXTENDING INTO SERN SD.  LOW LEVEL JET EXTENDING FROM CENTRAL
   KS...ERN NEB INTO SWRN/CENTRAL MN IS MAINTAINING A FEED OF HIGH
   MOISTURE LADEN AIR FROM THE MID MO VALLEY TO THE UPPER MS VALLEY. 
   THIS COMBINED WITH LOW LEVEL WAA SUGGESTS TSTMS WILL REMAIN LIKELY
   INTO EARLY WEDNESDAY MORNING FROM ERN NEB TO WRN/NWRN WI.  ALTHOUGH
   EFFECTIVE BULK SHEAR OF 40-45 KT ACROSS THE REMAINING VALID PORTIONS
   OF WWS 692 AND 693 IS SUFFICIENT FOR STORM ORGANIZATION...THE
   CONVECTIVELY OVERTURNED AIR MASS AND GREATER INSTABILITY RESIDING S
   ACROSS IA TO ERN NEB SHOULD SUPPORT A CONTINUED DECREASE IN SEVERE
   POTENTIAL.  THE EXCEPTION MAY BE INTO PART OF SWRN/SRN MN WHERE
   ONGOING STORMS NOW MOVING INTO FAR SWRN MN ARE LOCATED CLOSER TO THE
   FEED OF GREATER INSTABILITY AND CLOUD TOPS HAVE CONTINUED TO LOCALLY
   COOL.
   
   ..PETERS.. 07/27/2011
   
   
   ATTN...WFO...DLH...ARX...MPX...DMX...FSD...
   
   LAT...LON   43339611 43449687 44199659 44659535 45049450 45719395
               45839308 45679249 44639241 43899291 43459379 43279521
               43339611