SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 194
   NWS STORM PREDICTION CENTER NORMAN OK
   510 PM CDT WED MAY 12 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN OKLAHOMA
          NORTHWEST TEXAS
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 510 PM UNTIL
   1000 PM CDT.
   
   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 ALONG AND 55 STATUTE MILES
   EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHEAST OF CLINTON
   OKLAHOMA TO 15 MILES SOUTHWEST OF ABILENE TEXAS.
   
   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 192...WW 193...
   
   DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP SOON ALONG THE
   SEGMENTED DRYLINE FROM NW TX INTO WRN OK.  SURFACE TEMPERATURES HAVE
   WARMED INTO THE 90S TO NEAR 100 F...AND THIS HAS REMOVED CONVECTIVE
   INHIBITION AND CONTRIBUTED TO MLCAPE VALUES OF 2500-3500 J/KG IN THE
   MOIST AIR WHERE DEWPOINTS ARE IN THE 60S.  MID LEVEL FLOW HAS ALSO
   INCREASED TO 30-35 KT OVER NW TX AND WRN OK...WHICH WILL SUPPORT
   SUPERCELLS GIVEN THE STRONG INSTABILITY.  LARGE HAIL AND ISOLATED
   DAMAGING GUSTS WILL BE THE MAIN SEVERE THREATS THROUGH THIS EVENING
   AS STORMS DEVELOP AND MOVE SLOWLY EWD OFF THE RETREATING DRYLINE.
   
   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 550. MEAN STORM
   MOTION VECTOR 26020.
   
   
   ...THOMPSON