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Severe Thunderstorm Watch 581
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WW0581 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL1
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 581
   NWS STORM PREDICTION CENTER NORMAN OK
   305 PM CDT FRI AUG 10 2007
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST MINNESOTA
          NORTHEAST NORTH DAKOTA
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
   1000 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 APPROXIMATELY ALONG AND 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF
   GRAND FORKS NORTH DAKOTA TO 50 MILES NORTH NORTHEAST OF BEMIDJI
   MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
   
   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 579...WW 580...
   
   DISCUSSION...ELEVATED THUNDERSTORMS THAT FORMED EARLIER OVER
   CENTRAL/NE ND MAY BE EVOLVING INTO MORE SURFACE-BASED CONVECTION AS
   THE BOUNDARY LAYER WARMS AND CONVECTIVE INHIBITION DECREASES
   GRADUALLY.  THERE HAS BEEN SOME TENDENCY FOR MOISTURE TO MIX OUT
   FARTHER SE IN MN...BUT A CORRIDOR OF 65-70 F DEWPOINTS SHOULD BE
   MAINTAINED ALONG THE ENE-WSW ORIENTED FRONTAL ZONE ACROSS NE ND/NW
   MN.  ISOLATED ISOLATED/BRIEF TORNADO CANNOT BE RULED OUT AS STORMS
   INTERACT WITH THE SURFACE BOUNDARY...BUT DAMAGING WINDS AND LARGE
   HAIL SHOULD BE THE PRIMARY SEVERE STORM THREATS THROUGH THE
   AFTERNOON.
   
   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 26035.
   
   
   ...THOMPSON
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