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   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 638
   NWS STORM PREDICTION CENTER NORMAN OK
   1125 PM CDT WED JUL 14 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN AND CENTRAL NORTH DAKOTA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1125 PM
   UNTIL 500 AM 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 115 STATUTE MILES
   EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHWEST OF MINOT
   NORTH DAKOTA TO 60 MILES SOUTH OF BISMARCK NORTH DAKOTA.
   
   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 636. WATCH NUMBER 636 WILL NOT BE
   IN EFFECT AFTER 1125 PM CDT. CONTINUE...WW 637...
   
   DISCUSSION...THUNDERSTORM COMPLEX NOW DEVELOPING IN NW ND EXPECTED
   TO MOVE/ DEVELOP SE ALONG ERN EDGE OF LOW LEVEL INSTABILITY GRADIENT
   AS LOW LEVEL JET VEERS AND STRENGTHENS DOWNSTREAM FROM SRN CANADA
   UPPER IMPULSE. STRENGTH OF DEEP NWLY SHEAR /AROUND 50
   KT/...INCREASING LOWER TROPOSPHERIC MOISTURE TRANSPORT AND UPSTREAM
   COLD POOL  SUGGEST POTENTIAL FOR FORWARD-PROPAGATION WITH EMBEDDED
   SUPERCELLS PRODUCING HIGH WIND/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 550. MEAN STORM
   MOTION VECTOR 31035.
   
   
   ...CORFIDI