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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 654

NWS STORM PREDICTION CENTER NORMAN OK

310 PM CDT WED JUL 2 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF EASTERN IOWA

       MUCH OF NORTHERN ILLINOIS

       PARTS OF NORTHERN INDIANA

       SOUTHERN LOWER MICHIGAN

       PARTS OF NORTHWEST OHIO

       PARTS OF SOUTHERN WISCONSIN

       LAKE ERIE

       LAKE HURON

       LAKE MICHIGAN



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 310 PM UNTIL

1000 PM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH

SOUTHEAST OF MOUNT CLEMENS MICHIGAN TO 35 MILES SOUTHWEST OF

DUBUQUE IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 651. WATCH NUMBER 651 WILL NOT

BE IN EFFECT AFTER 310 PM CDT. CONTINUE...WW 652...WW 653...



DISCUSSION...SEVERE THUNDERSTORMS ARE EXPECTED TO CONTINUE

DEVELOPING AHEAD OF THE COLD FRONT IN A VERY MOIST...UNSTABLE AIR

MASS. WITH 30-40 KT OF SHEAR...STORMS ARE EVOLVING INTO LINE

SEGMENTS/BOW ECHOES AS THEY MOVE RAPIDLY EWD.  PRIMARY THREAT WILL

BE DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27040.





...HALES

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