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000 

WWUS20 KWNS 120215

SEL6

SPC WW 120215

MIZ000-MNZ000-WIZ000-LSZ000-120800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 686

NWS STORM PREDICTION CENTER NORMAN OK

915 PM CDT FRI JUL 11 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN UPPER MICHIGAN

       SMALL PART OF SOUTHEAST MINNESOTA

       PARTS OF NORTHERN AND WESTERN WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 915 PM

UNTIL 300 AM 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES EAST

NORTHEAST OF IRONWOOD MICHIGAN TO 35 MILES SOUTHEAST OF ROCHESTER

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 684...WW 685...



DISCUSSION...LINE OF SEVERE THUNDERSTORMS ACCOMPANIED BY DAMAGING

WINDS WILL MOVE EWD ACROSS THE WATCH WHERE THE AIR MASS IS MDTLY

UNSTABLE.  GIVEN THE APPROACH OF THE STRONG UPPER TROUGH AND

ASSOCIATED MID LEVEL WIND MAX...POTENTIAL FOR SEVERE WILL PERSISTS

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 24035.





...HALES

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