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.

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.