SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 504
   NWS STORM PREDICTION CENTER NORMAN OK
   1050 AM CDT MON JUN 20 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL MINNESOTA
   
   EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1050 AM UNTIL 400
   PM CDT.
   
   HAIL TO 1.5 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 55
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
   SOUTHWEST OF ALEXANDRIA MINNESOTA TO 20 MILES NORTHEAST OF
   MINNEAPOLIS MINNESOTA. 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.
   
   DISCUSSION...CONVECTION IN W CENTRAL MN HAS INTENSIFIED IN THE PAST
   HOUR...WITH A TENDENCY FOR MORE ESEWD MOTION ALONG AN OUTFLOW
   BOUNDARY ACROSS CENTRAL MN.  STRONG INSTABILITY ROOTED JUST OFF THE
   SURFACE IS FEEDING THIS CONVECTION...WHILE SURFACE HEATING IN
   ADVANCE OF THE STORMS WILL DESTABILIZE THE BOUNDARY LAYER AND AID
   MAINTAINING A DAMAGING WIND THREAT FOR SEVERAL MORE HOURS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 29040.
   
   
   ...THOMPSON