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Tornado Watch 659
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WW0659 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 659
   NWS STORM PREDICTION CENTER NORMAN OK
   510 PM CDT SAT JUL 5 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHWEST MINNESOTA
          EASTERN NORTH DAKOTA
   
   EFFECTIVE THIS SATURDAY AFTERNOON FROM 510 PM UNTIL MIDNIGHT CDT.
   
   TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
   MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF HALLOCK
   MINNESOTA TO 75 MILES SOUTH SOUTHEAST OF JAMESTOWN NORTH DAKOTA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU9).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 658...
   
   DISCUSSION...THE FIRST SURFACE-BASED STORM HAS DEVELOPED IN ERN ND
   IN ADVANCE OF A PRE-FRONTAL TROUGH.  BOUNDARY LAYER DEWPOINTS IN THE
   UPPER 60S WITH UPPER 80S SURFACE TEMPERATURES HAVE RESULTED IN
   STRONG INSTABILITY IN THE WARM SECTOR...AND A SUFFICIENTLY WEAK CAP
   TO ALLOW THUNDERSTORM DEVELOPMENT.  ADDITIONAL STORMS WILL LIKELY
   FORM THIS EVENING AS AN ASSOCIATED MID LEVEL TROUGH MOVES EWD FROM
   ND TO NW MN.  VERTICAL SHEAR AND LOW-LEVEL MOISTURE MAY BE
   SUFFICIENT FOR A COUPLE OF TORNADOES THIS EVENING WITH THE DISCRETE
   INITIAL STORMS...ALONG WITH LARGE HAIL.  STORMS COULD ALSO EVOLVE
   INTO MORE OF A CLUSTER OR LINE SEGMENTS LATER WITH AN ATTENDANT
   THREAT FOR DAMAGING WINDS.
   
   AVIATION...TORNADOES AND 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 27025.
   
   
   ...THOMPSON
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