MESOSCALE DISCUSSION 1219
   NWS STORM PREDICTION CENTER NORMAN OK
   0652 PM CDT THU JUN 18 2009
   
   AREAS AFFECTED...MUCH OF THE SRN HALF OF SD...NRN AND CENTRAL
   NEB...SWRN MN
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 182352Z - 190145Z
   
   A SLOW INCREASE IN CONVECTION -- AND ASSOCIATED SEVERE POTENTIAL --
   IS EXPECTED OVER THE NEXT COUPLE OF HOURS...WITH NEW WW POSSIBLE.
   
   STORMS CONTINUE TO SLOWLY SPREAD/INCREASE EWD FROM ERN WY...AS AN
   UPPER FEATURE MOVES SLOWLY EWD ACROSS WRN WY/NWRN CO.  MEANWHILE...A
   STRENGTHENING SLY LOW-LEVEL JET IS FORECAST THIS EVENING ACROSS
   KS/SRN NEB...RESULTING IN AN INCREASE IN QG FORCING ACROSS A LARGE
   AREA OF THE CENTRAL PLAINS.  
   
   AS OUTFLOW SPREADS SWD FROM ONGOING NRN/CENTRAL SD STORMS...AND WITH
   SEVERAL OTHER BOUNDARIES EVIDENT ACROSS THIS REGION PER LATEST
   SURFACE ANALYSIS AND VISIBLE SATELLITE/RADAR LOOPS...EXPECT AN
   OVERALL INCREASE IN STORMS OVER THE NEXT FEW HOURS.  WITH MODERATE
   INSTABILITY ACROSS MUCH OF THIS AREA AND INCREASING LOW-LEVEL FLOW
   BENEATH MODERATE WSWLYS AT MID LEVELS...SHEAR WILL SUPPORT
   ORGANIZED/SUPERCELL STORMS -- AND ASSOCIATED THREATS FOR LARGE HAIL
   AND DAMAGING WINDS.
   
   ..GOSS.. 06/18/2009
   
   
   ATTN...WFO...MPX...FSD...OAX...ABR...GID...LBF...UNR...CYS...
   
   LAT...LON   40940094 41170275 42140321 42790322 44140079 44679710
               44639584 43889575 41959672 40940094