MESOSCALE DISCUSSION 0794
   NWS STORM PREDICTION CENTER NORMAN OK
   1056 AM CDT TUE MAY 06 2008
   
   AREAS AFFECTED...SERN SD...NRN NEB...NWRN IA...SWRN MN
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 061556Z - 061730Z
   
   STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY OVER THE
   NEXT FEW HOURS...AND A WW MAY BECOME NECESSARY.
   
   SATELLITE IMAGERY AND OBJECTIVE ANALYSIS SUGGEST A WEAK MID LEVEL
   SHORTWAVE TROUGH IS NOW MOVING ACROSS S CNTRL SD...HELPING TO
   PRODUCE THE CURRENT CONVECTION WHERE WEAK WARM ADVECTION AND
   FRONTOGENETICAL FORCING COEXIST. MORNING SOUNDINGS SHOW VERY COOL
   TEMPERATURES ALOFT WITH STEEP MID LEVEL LAPSE RATES...SUGGESTING
   LARGE HAIL POTENTIAL EVEN WITH LIMITED LOW LEVEL MOISTURE.
   
   SURFACE HEATING WILL ALLOW TEMPERATURES TO RISE INTO THE 70S OVER
   MUCH OF ERN NEB/WRN IA/SWRN MN...WHILE DEWPOINTS STEADILY INCREASE
   INTO THE LOWER 50S. MODIFIED SOUNDINGS GIVEN THESE CONDITIONS ARE
   MORE THAN FAVORABLE FOR LARGE HAIL...WITH DEEP LAYER WIND SHEAR
   FAVORABLE FOR SUSTAINED/ORGANIZED CONVECTION. WHILE HAIL...POSSIBLY
   BECOMING VERY LARGE...WILL BE THE MAIN THREAT...DAMAGING WIND GUSTS
   WILL ALSO BE A CONCERN AS LOW LEVEL LAPSE RATES STEEPEN LATER THIS
   AFTERNOON.
   
   ..JEWELL.. 05/06/2008
   
   
   ATTN...WFO...DMX...FSD...OAX...ABR...LBF...UNR...
   
   42570020 43230093 43959969 43759555 43149475 42319496
   42059578 42169738