

000 

WWUS20 KWNS 072222

SEL6

SPC WW 072222

MNZ000-NDZ000-080200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 666

NWS STORM PREDICTION CENTER NORMAN OK

525 PM CDT MON JUL 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST MINNESOTA

       NORTHEAST NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 525 PM UNTIL 900

PM 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 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST NORTHWEST OF

GRAND FORKS NORTH DAKOTA TO 50 MILES SOUTH SOUTHEAST OF THIEF

RIVER FALLS MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 663...WW 664...WW 665...



DISCUSSION...SUPERCELLS THAT DEVELOPED ALONG THE SURFACE WIND SHIFT

ACROSS ERN ND ARE INTERACTING WITH A REMNANT OUTFLOW BOUNDARY ACROSS

NW MN AND NE ND.  LOW-LEVEL SHEAR IS MAXIMIZED ALONG THIS BOUNDARY

IN A MOIST ENVIRONMENT...AND THE BOUNDARY APPEARS TO BE LIFTING

SLOWLY NWD WITH TIME.  THEREFORE...EXPECT THE TORNADO THREAT TO

PERSIST FOR A FEW MORE HOURS ACROSS NE ND/NW MN.



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 29025.





...THOMPSON

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