SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 424
   NWS STORM PREDICTION CENTER NORMAN OK
   425 PM MDT TUE MAY 30 2006
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN COLORADO
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 425 PM UNTIL
   1100 PM MDT.
   
   HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
   STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF
   LIMON COLORADO TO 50 MILES WEST SOUTHWEST OF SPRINGFIELD
   COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 422...WW 423...
   
   DISCUSSION...UPSLOPE FLOW OF INCREASINGLY UNSTABLE AIR MASS ALONG
   WITH 40-50 KT OF DEEP LAYER SHEAR PROVIDING INGREDIENTS FOR SEVERE
   THUNDERSTORMS HIGH PLAINS OF CO.  WHILE SUPERCELLS ARE
   POSSIBLE...RELATIVELY WEAK LOW LEVEL SHEAR AND ONLY MODEST
   INSTABILITY...LARGE HAIL EXPECTED TO BE PRIMARY THREAT.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 24025.
   
   
   ...HALES