MESOSCALE DISCUSSION 0821
   NWS STORM PREDICTION CENTER NORMAN OK
   0113 PM CDT SAT MAY 22 2004
   
   AREAS AFFECTED...NERN CO...EXTREME SWRN NEBRASKA...EXTREME NWRN KS
   
   CONCERNING...SEVERE THUNDERSTORM POTENTIAL 
   
   VALID 221813Z - 222015Z
   
   SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS AND ISOLATED
   TORNADOES WILL FORM BY 20Z OVER NERN CO...POSSIBLY EXTENDING EWD
   INTO EXTREME NWRN KS.  WW WILL BE ISSUED BEFORE 20Z.
   
   LATEST VISIBLE IMAGERY INDICATES INCREASING TREND IN TCU / CB
   DEVELOPMENT OVER CO AND WY INTO WRN NEB...AS UPPER SHORTWAVE TROUGH
   AND ASSOCIATED COOLING/LIFT MOVE NEWD OVER CO. AT THE
   SURFACE...AXIS OF 50 + DEWPOINTS EXTENDS INTO NERN CO.
   
   A CONTINUATION OF STRONG HEATING...MOISTURE ADVECTION AND
   CONVERGENCE ALONG DEVELOPING WARM FRONT WILL ALLOW FOR RAPID
   DESTABILIZATION AND THE FORMATION OF SUPERCELL THUNDERSTORMS. THESE
   STORMS WILL HAVE THE POTENTIAL FOR LARGE HAIL...DAMAGING WIND...AND
   ISOLATED TORNADOES.  TORNADO THREAT WILL BE HIGHEST WITHIN MOIST
   AXIS WHERE BOUNDARY LAYER RH WILL BE HIGHEST AND SURFACE WINDS
   BACKED.  HAIL THREAT WILL INCREASE THROUGH THE AFTERNOON HOURS WITH
   THE THREAT OF EXTREMELY DAMAGING HAIL STORMS BY THE TIME STORMS
   ENTER SWRN NEBRASKA...WHERE INSTABILITY WILL BE STRONG.
   
   ..JEWELL.. 05/22/2004
   
   
   ATTN...WFO...LBF...GLD...BOU...CYS...
   
   38980202 38910265 39160360 39500406 39830496 40700489
   40980400 41580378 41170127 40450121