SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN LOWER MICHIGAN CENTRAL AND EAST-CENTRAL WISCONSIN LAKE MICHIGAN EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 640 PM UNTIL 200 AM CDT.

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URGENT - IMMEDIATE BROADCAST REQUESTED   SEVERE THUNDERSTORM WATCH NUMBER 520   NWS STORM PREDICTION CENTER NORMAN OK   640 PM CDT WED JUL 25 2012      THE NWS STORM PREDICTION CENTER HAS ISSUED A   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF              WESTERN LOWER MICHIGAN          CENTRAL AND EAST-CENTRAL WISCONSIN          LAKE MICHIGAN      EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 640 PM   UNTIL 200 AM CDT.      WIDESPREAD DAMAGING WINDS   WIND GUSTS TO 70 MPH LIKELY   SCATTERED LARGE HAIL   ISOLATED HAIL TO 2.0 INCHES IN DIAMETER POSSIBLE   ISOLATED TORNADOES      THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF   CAMP DOUGLAS WISCONSIN TO 45 MILES EAST OF ROBEN HOOD MICHIGAN.    FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH   OUTLINE UPDATE (WOUS64 KWNS WOU0).      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 518...WW 519...      DISCUSSION...RECENT TSTM INITIATION HAS OCCURRED JUST W OF GRB INVOF   SURFACE LOW AND COLD FRONT WHERE LOW-LEVEL CONVERGENCE IS BEING   ENHANCED.  STRENGTHENING SWLY LLJ THIS EVENING SHOULD BOOST   CONVERGENCE ALONG THE COLD FRONT...FOSTERING AN INCREASE IN STORMS   OVER E-CNTRL WI WITHIN AN ENVIRONMENT CHARACTERIZED BY MLCAPE OF   2000-3000 J/KG AND 40-50 KT OF DEEP-LAYER SHEAR.  INITIAL STORM MODE   MAY BE SUPERCELLULAR WITH A RISK FOR LARGE HAIL AND POSSIBLY A   TORNADO.  UPSCALE GROWTH INTO A BOW ECHO IS ANTICIPATED LATER ACROSS   LOWER MI WHERE CORRIDORS OF WIND DAMAGE WILL BE POSSIBLE.      AVIATION...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 500. MEAN STORM   MOTION VECTOR 28040.