MESOSCALE DISCUSSION 1001
   NWS STORM PREDICTION CENTER NORMAN OK
   0336 PM CDT MON JUN 04 2007
   
   AREAS AFFECTED...SRN SD...ERN NEB
   
   CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 
   
   VALID 042036Z - 042200Z
   
   AN ISOLATED SEVERE THREAT MAY DEVELOP ACROSS ERN NEB AND SRN SD OVER
   THE NEXT 1 TO 2 HOURS AS THUNDERSTORMS EXPAND IN COVERAGE. LARGE
   HAIL WILL LIKELY BE THE PRIMARY THREAT. THE THREAT SHOULD REMAIN TOO
   MARGINAL FOR A WW LATE THIS AFTERNOON.
   
   A SUBTLE SHORTWAVE TROUGH EVIDENT ON WATER VAPOR IMAGERY IS MOVING
   SSEWD ACROSS FAR NRN NEB AND WILL CONTINUE TO SUPPORT THUNDERSTORM
   DEVELOPMENT ACROSS THE REGION LATE THIS AFTERNOON. THE CONVECTION IS
   LOCATED ALONG A MOIST AXIS WITH DEWPOINTS IN THE UPPER 50S F
   CONTRIBUTING TO SBCAPE VALUES IN THE 1500 TO 2000 J/KG RANGE. THE
   CONVECTION SHOULD MOVE SSEWD ACROSS FAR SRN SD AND ERN NEB WHERE
   VERTICAL SHEAR ACCORDING TO REGIONAL PROFILER DATA IS RELATIVELY
   WEAK. HOWEVER...ADEQUATE LARGE-SCALE ASCENT...500 MB TEMPS OF -14C
   AND STEEP MID-LEVEL LAPSE RATES WILL MAKE LARGE HAIL POSSIBLE WITH
   THE STRONGER CORES.
   
   ..BROYLES.. 06/04/2007
   
   
   ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...
   
   43650014 43799844 41449600 40229676 40329830 42810075