SPC MESOSCALE DISCUSSION 1859 FOR CNTRL KS AND SCNTRL NEB
CONCERNING...SEVERE THUNDERSTORM POTENTIAL...

VALID 231746Z - 232000Z

THUNDERSTORMS ARE EXPECTED TO CONTINUE DEVELOPING OVER CNTRL KS
INTO SCNTRL NEB THIS AFTERNOON WITH LARGE HAIL AND DAMAGING WINDS
BEING THE PRIMARY THREAT.  WW MAY BE REQUIRED IN THE NEXT HOUR.

VIS IMAGERY SHOWS MAINLY CLEAR SKIES OVER KS INTO SCNTRL NEB
ALLOWING FOR SUFFICIENT HEATING/DESTABILIZATION OF BOUNDARY LAYER. 
SURFACE DEWPOINTS IN THE MID-UPPER 60S COMBINED WITH STEEP LAPSE
RATES /7.5-8.0 C/KM/ AND CONTINUED SURFACE HEATING IS RESULTING IN
MODERATE INSTABILITY WITH MLCAPE VALUES UP TO 2000 J/KG.  SURFACE
ANALYSES SHOW A NW-SE ORIENTED BOUNDARY FROM SWRN NEB INTO ERN KS
WITH A LEE TROUGH EXTENDING N-S FROM WRN NEB INTO WRN KS.  LOW-
LEVEL CONVERGENCE ALONG THESE BOUNDARIES COMBINED WITH LARGE-SCALE
ASCENT IN ADVANCE OF THE UPPER LOW OVER NERN CO WILL CONTINUE TO
SUPPORT THUNDERSTORM DEVELOPMENT THIS AFTERNOON.  VAD/WIND
PROFILERS SHOW STRONGER MID-UPPER LEVEL FLOW OVER SRN KS /30-35 KT/
...RESULTING IN A GREATER THREAT FOR SUPERCELLS...MAINLY NORTH OF
A LINE FROM DDC-ICT.

..PETERS.. 08/23/01