MESOSCALE DISCUSSION 1826
   NWS STORM PREDICTION CENTER NORMAN OK
   0217 PM CDT SAT AUG 08 2009
   
   AREAS AFFECTED...PARTS OF NRN NEB/ERN SD INTO SERN ND/ADJACENT NW MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 676...
   
   VALID 081917Z - 082015Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 676
   CONTINUES.
   
   HAIL IS EXPECTED TO BE THE PRIMARY THREAT ACROSS WW 676 THIS
   AFTERNOON.  STORMS MOVING N OF THIS WATCH SHOULD TEND TO WEAKEN AS
   THEY TRACK INTO A MORE STABLE AIR MASS.
   
   OBJECTIVE ANALYSES SHOWED MODERATE INSTABILITY REMAINED ACROSS THE
   ERN HALF OF WW 676...WITH INSTABILITY DECREASING WITH WWD AND NWD
   EXTENT AS INDICATED BY THE SPECIAL 18Z ABR SOUNDING.  EARLY
   AFTERNOON SURFACE ANALYSIS INDICATED A COLD FRONT HAS MOVED THROUGH
   MUCH OF ERN SD...WHILE REGIONAL RADARS SHOWED TSTMS CONTINUING TO
   FORM W OF THE FRONT ACROSS MUCH OF THIS WATCH.  STRONG FORCING FOR
   ASCENT IS EXPECTED TO MAINTAIN TSTM DEVELOPMENT EVEN WITHIN THE
   POST-FRONTAL ENVIRONMENT WHERE STRONG EFFECTIVE BULK SHEAR WILL
   SUPPORT ORGANIZED STORMS.  COUNTIES SHOULD BE ABLE TO BE REMOVED
   FROM WW 676 ONCE THE FORCING ALOFT ATTENDANT TO THE CENTRAL SD
   SHORTWAVE TROUGH MOVES EAST OF A GIVEN LOCATION.
   
   ..PETERS.. 08/08/2009
   
   
   ATTN...WFO...FGF...FSD...OAX...ABR...BIS...LBF...UNR...
   
   LAT...LON   42119833 42060035 42390060 43100045 44130018 44449979
               45959971 46439910 46739770 46619645 46219611 45959655
               45389685 45109735 44689772 43879791 43849829 43469825
               43409810 42779810 42609758 41979773 42119833