MESOSCALE DISCUSSION 0908
   NWS STORM PREDICTION CENTER NORMAN OK
   0255 PM CDT MON JUN 01 2009
   
   AREAS AFFECTED...SOUTHERN NEB...NORTHERN KS...SOUTHERN IA...NORTHERN
   MO
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 011955Z - 012200Z
   
   SCATTERED THUNDERSTORMS MAY BEGIN TO DEVELOP IN THE NEXT 1-3 HOURS
   ALONG A WEAK SURFACE BOUNDARY EXTENDING ACROSS SOUTHERN NEB INTO
   SOUTHERN IA.  STRONG INSTABILITY MAY HELP TO OFFSET MARGINAL
   VERTICAL SHEAR PROFILES FOR A RISK OF SEVERE STORMS.  A WATCH MAY BE
   REQUIRED LATER THIS AFTERNOON.
   
   LATEST SURFACE ANALYSIS SHOWS A SURFACE BOUNDARY FROM NEAR GLD
   EAST-NORTHEASTWARD INTO SOUTHEAST NEB AND SOUTHERN IA.  TEMPERATURES
   WARMING INTO THE UPPER 80S SOUTH OF THE BOUNDARY...ALONG WITH
   SURFACE DEWPOINTS CLIMBING INTO THE LOWER 60S...ARE YIELDING MLCAPE
   VALUES OVER 3000 J/KG WITH LITTLE CINH REMAINING.  IT APPEARS LIKELY
   THAT AT LEAST ISOLATED THUNDERSTORMS WILL FORM IN THIS AREA IN THE
   NEXT FEW HOURS.  RUC FORECAST SOUNDINGS SHOW STEEP LOW AND MID LEVEL
   LAPSE RATES WHICH WILL POSE A RISK OF STRONG DOWNDRAFTS AND HAIL IN
   STRONGER CORES.  ALSO...BACKED NEAR-SURFACE WINDS ALONG AND NORTH OF
   THE BOUNDARY MAY RESULT IN TRANSIENT SUPERCELL STRUCTURES. 
   HOWEVER...DEEP LAYER VERTICAL SHEAR IS QUITE WEAK AND SHOULD
   GENERALLY LIMIT LONGEVITY/ORGANIZATION OF INDIVIDUAL CELLS.
   
   ..HART.. 06/01/2009
   
   
   ATTN...WFO...DMX...EAX...OAX...TOP...ICT...GID...LBF...DDC...
   GLD...
   
   LAT...LON   40860151 41249866 41389356 41119232 40059349 39409604
               39199833 39029984 38650097 38860194 39720218 40860151