

000 

WWUS20 KWNS 171834

SEL7

SPC WW 171834

MIZ000-WIZ000-180000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 407

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CDT SUN JUN 17 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PART OF THE WESTERN UPPER PENINSULA MICHIGAN

       NORTHEASTERN WISCONSIN



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 700

PM CDT.



TORNADOES...HAIL TO 3 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 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF

RHINELANDER WISCONSIN TO 40 MILES SOUTHEAST OF IRON MOUNTAIN

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...PAIR OF SUPERCELLS HAS DEVELOPED QUICKLY THIS AFTERNOON

OVER N-CENTRAL WI.  ACTIVITY WILL LIKELY CONTINUE TO BE FED BY VERY

UNSTABLE AIR TO THE SOUTHWEST...WITH FURTHER INSTABILITY LIKELY

AHEAD OF THESE STORMS INTO NERN WI REST OF THE AFTERNOON.  STRONG

SHEAR AND COLLOCATION ALONG SURFACE WARM FRONT WILL INCREASE THE

RISK OF A FEW TORNADOES.  VERY LARGE HAIL AND ISOLATED WIND DAMAGE

ARE ALSO LIKELY WITH THESE STORMS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 25025.





...EVANS

