MESOSCALE DISCUSSION 2134
   NWS STORM PREDICTION CENTER NORMAN OK
   0252 PM CDT SAT AUG 09 2003
   
   AREAS AFFECTED...WRN/CENTRAL NEB...EXTREME NERN CO
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 091952Z - 092145Z
   
   THUNDERSTORMS ARE EXPECTED TO CONTINUE DEVELOPING OVER PARTS OF
   WRN/N CNTRL NEB AND AREA IS BEING MONITORED FOR A WW.
   
   ISOLATED HIGH-BASED THUNDERSTORMS ARE DEVELOPING ACROSS PARTS OF THE
   NEB PANHANDLE NEAR SURFACE WIND SHIFT LINE EXTENDING FROM WRN CHERRY
   COUNTY INTO SCOTTS BLUFF COUNTY.  VERY STEEP LAPSE RATES NEAR 8.5
   C/KM COUPLED WITH SURFACE DEW POINTS IN THE LOW 60S SOUTHEAST OF THE
   WIND SHIFT LINE ARE RESULTING IN MODERATE INSTABILITY WITH MLCAPE OF
   1500-2500 J/KG.  VISIBLE IMAGERY SHOWS CU STREETS BECOMING APPARENT
   ACROSS THE SERN PANHANDLE SUGGESTING THE CAP IS WEAKENING AND
   ADDITIONAL THUNDERSTORMS MAY DEVELOP OVER THE NEXT 2 HOURS. 
   ALTHOUGH WINDS ALOFT ARE RELATIVELY WEAK ATTM /RUC HOURLY ANALYSIS
   INDICATES 10-15 KT AT 500 MB/...THE MID LEVEL FLOW IS FORECAST TO
   INCREASE TO AROUND 20 KT LATER THIS AFTERNOON WITH AN INCREASE IN
   DIRECTIONAL SHEAR WITH HEIGHT AS THE LOW LEVEL FLOW BACKS. 
   POTENTIAL FOR SEVERE STORMS IS EXPECTED TO GRADUALLY INCREASE AND
   AREA IS BEING MONITORED FOR POSSIBLE WW.
   
   ..WEISS.. 08/09/2003
   
   
   ATTN...WFO...LBF...UNR...BOU...CYS...
   
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