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000 

WWUS20 KWNS 051812

SEL8

SPC WW 051812

INZ000-MIZ000-OHZ000-LEZ000-LHZ000-LMZ000-060200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 488

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT THU JUL 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST INDIANA

       LOWER MICHIGAN AND PARTS OF EASTERN UPPER MICHIGAN

       NORTHWEST OHIO

       LAKE ERIE

       LAKE HURON

       LAKE MICHIGAN



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

1000 PM EDT.



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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH

NORTHWEST OF PELLSTON MICHIGAN TO TOLEDO OHIO.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU8).



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 487...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/INTENSITY OVER

LWR MI THIS AFTN AS HEATING FURTHER DESTABILIZES REGION DOWNSTREAM

FROM AMPLIFYING GRB UPR VORT.  DESPITE MODEST SFC MOISTURE...

SEASONABLY COLD AIR ALOFT AND CONVERGENCE ALONG LAKE

BOUNDARIES/VORT-INDUCED SFC FEATURES LIKELY TO SUPPORT

CLUSTERS/BANDS OF STORMS WITH A POTENTIAL FOR SVR HAIL AND LOCALLY

DAMAGING WIND THROUGH EARLY TONIGHT.



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 450. MEAN STORM

MOTION VECTOR 33035.





...CORFIDI

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