MESOSCALE DISCUSSION 0680
   NWS STORM PREDICTION CENTER NORMAN OK
   1019 PM CDT SUN MAY 23 2010
   
   AREAS AFFECTED...SRN THROUGH CNTRL SD
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 240319Z - 240445Z
   
   THREAT FOR MAINLY ISOLATED LARGE HAIL AND POSSIBLY DAMAGING WIND
   EXPECTED TO INCREASE NWD THROUGH SD NEXT FEW HOURS. A SEVERE
   THUNDERSTORM WATCH MAY BE NEEDED FOR THIS AREA SOON.
   
   WARM FRONT IS LOCATED FROM SERN SD SWWD THROUGH CNTRL AND SWRN NEB
   INTO NWRN KS. OBJECTIVE ANALYSIS SHOWS ONLY MODEST INSTABILITY
   ACROSS SD AT THIS TIME. HOWEVER...STRENGTHENING SLY LOW LEVEL JET IS
   ADVECTING HIGHER THETA-E AIR NWD ABOVE THE SURFACE...RESULTING IN
   DESTABILIZATION ACROSS SD. MUCAPE IS FORECAST TO INCREASE TO IN
   EXCESS OF 2000 J/KG LATER TONIGHT INTO THE MORNING HOURS. STORMS
   WILL LIKELY DEVELOP NWD INTO SD NEXT SEVERAL HOURS WITHIN THE ZONE
   OF DESTABILIZATION AND ISENTROPIC ASCENT ALONG THE LOW LEVEL JET
   AXIS. THE THERMODYNAMIC ENVIRONMENT WILL BECOME INCREASINGLY
   SUPPORTIVE OF LARGE HAIL. IN ADDITION UNIDIRECTIONAL EFFECTIVE SHEAR
   OF 40+ KT SUGGESTS A FEW STORMS MAY DEVELOP MID LEVEL UPDRAFT
   ROTATION WHICH WOULD FURTHER AUGMENT THE THREAT FOR LARGE HAIL.
   
   ..DIAL.. 05/24/2010
   
   
   ATTN...WFO...FSD...ABR...UNR...
   
   LAT...LON   43269808 43070032 43200212 44260213 44940128 45229966
               44789793 43269808