SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 272
   NWS STORM PREDICTION CENTER NORMAN OK
   1010 AM CDT MON MAY 24 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST IOWA
          SOUTHWEST MINNESOTA
          NORTHEAST NEBRASKA
          EASTERN SOUTH DAKOTA
   
   EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1010 AM UNTIL 400
   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 ALONG AND 90 STATUTE MILES
   EAST AND WEST OF A LINE FROM 35 MILES NORTH NORTHEAST OF WATERTOWN
   SOUTH DAKOTA TO 15 MILES SOUTHWEST OF SIOUX CITY IOWA.
   
   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 271...
   
   DISCUSSION...SCATTERED ELEVATED THUNDERSTORMS ARE DEVELOPING ACROSS
   PARTS OF SOUTHEAST SD AND NORTHEAST NEB...IN REGION OF STRONG LOW
   LEVEL WARM ADVECTION.  SUBSTANTIAL ELEVATED CAPE AND STRONG VERTICAL
   SHEAR SUGGEST A RISK OF SUPERCELLS CAPABLE OF LARGE HAIL.
   
   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 500. MEAN STORM
   MOTION VECTOR 25030.
   
   
   ...HART