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000 

WWUS20 KWNS 072240

SEL1

SPC WW 072240

INZ000-MIZ000-LMZ000-080400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 481

NWS STORM PREDICTION CENTER NORMAN OK

640 PM EDT SAT JUN 7 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF NORTHERN INDIANA

       PARTS OF SOUTHERN AND WESTERN LOWER MICHIGAN

       LAKE MICHIGAN



EFFECTIVE THIS SATURDAY NIGHT FROM 640 PM UNTIL MIDNIGHT EDT.



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 EAST AND WEST OF A LINE FROM 35 MILES NORTH OF GRAND RAPIDS

MICHIGAN TO 50 MILES SOUTHEAST OF VALPARAISO INDIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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 478...WW 479...WW 480...



DISCUSSION...SEVERE THUNDERSTORMS INCLUDING TORNADIC SUPERCELLS OVER

NRN IL AND SRN WI MOVING E/NE.  WHILE CONDITIONS ARE NOT QUITE AS

FAVORABLE E OF LM THERE IS STILL FAVORABLE DEEP LAYER SHEAR AND MDT

INSTABILITY...THUS THREAT OF SUPERCELLS INCLUDING TORNADOES IS

EXPECTED TO CONTINUE UNTIL AT LEAST SUNSET ACROSS WATCH AREA.



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

550. MEAN STORM MOTION VECTOR 24030.





...HALES

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