SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 158
   NWS STORM PREDICTION CENTER NORMAN OK
   320 PM CDT SUN APR 17 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHEAST COLORADO
          SOUTHWEST KANSAS
          NORTHEAST NEW MEXICO
          WESTERN OKLAHOMA PANHANDLE
          WESTERN TEXAS PANHANDLE
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 320 PM UNTIL 1100
   PM CDT.
   
   HAIL TO 2 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 85
   STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTHEAST OF
   LAMAR COLORADO TO 45 MILES SOUTHEAST OF TUCUMCARI NEW MEXICO.  FOR
   A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU8).
   
   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.
   
   DISCUSSION...THUNDERSTORMS DEVELOPING EWD OFF HIGHER TERRAIN SERN
   CO/NERN NM WILL BECOME ORGANIZED INTO A BROKEN LINE WITH INCREASING
   SEVERE POTENTIAL AS THEY ENCOUNTER SLY FLOW OF A MDTLY UNSTABLE
   AIRMASS.  LARGE SCALE UPWARD MOTION ASSOCIATED WITH VORT MAX MOVING
   ACROSS SERN CO WILL ENHANCE SEVERE POTENTIAL.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
   MOTION VECTOR 27025.
   
   
   ...HALES