SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 177
   NWS STORM PREDICTION CENTER NORMAN OK
   755 PM CDT SUN MAY 9 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST IOWA
          NORTHWEST KANSAS
          CENTRAL AND NORTHEAST NEBRASKA
          EXTREME SOUTHEAST SOUTH DAKOTA
   
   EFFECTIVE THIS SUNDAY NIGHT FROM 755 PM UNTIL MIDNIGHT 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 ALONG AND 85 STATUTE MILES
   EAST AND WEST OF A LINE FROM 65 MILES WEST NORTHWEST OF SPENCER
   IOWA TO 15 MILES SOUTH SOUTHEAST OF GOODLAND KANSAS.
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   SEVERE THUNDERSTORM WATCH NUMBER 171...SEVERE THUNDERSTORM WATCH
   NUMBER 172. WATCH NUMBER 171 172 WILL NOT BE IN EFFECT AFTER 755
   PM CDT. CONTINUE...WW 174...WW 175...WW 176...
   
   DISCUSSION...THUNDERSTORMS EXPECTED TO CONTINUE DEVELOPING ALONG
   COLD FRONT/PRE FRONTAL TROUGH MOVING SE ACROSS SE SD/NE NEB/NW
   IA...WHERE DEEP SHEAR AND INSTABILITY WILL REMAIN SUPPORTIVE OF
   LARGE HAIL/HIGH WIND FROM SUSTAINED ACTIVITY/POSSIBLE SUPERCELLS. 
   FARTHER S...STORMS FORMING IN ZONE OF WEAKER SHEAR SWWD ALONG TROUGH
   EXPECTED TO CONTINUE DEVELOPING /1/ WWD INTO STRONG LOW LEVEL
   INSTABILITY OVER PARTS OF SW NEB/NW KS...AND /2/ SWD INTO LOW LEVEL
   JET ACROSS CNTRL/ERN NEB.
   
   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 550. MEAN STORM
   MOTION VECTOR 30015.
   
   
   ...CORFIDI