* WHAT. High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves. * WHERE. Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN. From 8 PM EDT this evening through Sunday morning. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.

SMWLOT The National Weather Service in Chicago has issued a * Special Marine Warning for. Nearshore Waters from Winthrop Harbor to Calumet Harbor. Open Waters from Winthrop Harbor to Michigan City out to Mid Lake. * Until 1015 PM CDT. * At 818 PM CDT, severe thunderstorms were located along a line extending from 34 nm west of Pleasant Prairie to 19 nm northwest of McHenry to 34 nm northwest of Elgin, moving southeast at 40 knots. HAZARD. Wind gusts in excess of 50 knots. SOURCE. Radar. IMPACT. Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. * Severe thunderstorms will be near. Waukegan Harbor around 910 PM CDT. Wilmette Harbor around 925 PM CDT. Montrose Harbor around 935 PM CDT. Harrison-Dever Crib, Belmont Harbor, and Diversy Harbor around 940 PM CDT. Monroe Harbor, Burnham Harbor, and DuSable Harbor around 945 PM CDT. 31st Street Harbor around 950 PM CDT. 59th Street Marina and Jackson Park Harbor around 955 PM CDT.

For the following areas. Nearshore Waters from Winthrop Harbor to Calumet Harbor. Open Waters from Winthrop Harbor to Michigan City out to Mid Lake. At 851 PM CDT, severe thunderstorms were located along a line extending from 7 nm west of Pleasant Prairie to 14 nm west of Waukegan Harbor to near McHenry, moving east at 45 knots. HAZARD. Wind gusts in excess of 50 knots. SOURCE. Radar indicated. IMPACT. Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. severe thunderstorms will be near. Winthrop Harbor around 900 PM CDT. Waukegan Harbor around 905 PM CDT.

* WHAT. High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves. * WHERE. Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN. Through Sunday morning. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 447 IN EFFECT UNTIL 1 AM CDT SUNDAY FOR THE FOLLOWING AREAS THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS WINTHROP HARBOR TO WILMETTE HARBOR IL WILMETTE HARBOR TO NORTHERLY ISLAND IL NORTHERLY ISLAND TO CALUMET HARBOR IL

* WHAT. Southwest winds to 30 kt. * WHERE. Illinois and Indiana nearshore from Winthrop Harbor IL to Michigan City IN. * WHEN. Until 1 AM CDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. West winds 10 to 20 knots with gusts up to 25 knots and waves 2 to 5 feet expected. * WHERE. St Joseph to Whitehall. * WHEN. From 8 PM this evening to noon EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 447 IN EFFECT UNTIL 1 AM CDT SUNDAY FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 16 COUNTIES IN CENTRAL ILLINOIS LIVINGSTON IN NORTH CENTRAL ILLINOIS BOONE DE KALB LA SALLE LEE OGLE WINNEBAGO IN NORTHEAST ILLINOIS COOK DUPAGE GRUNDY KANE KANKAKEE KENDALL LAKE IL MCHENRY WILL IN INDIANA THIS WATCH INCLUDES 1 COUNTY IN NORTHWEST INDIANA LAKE IN THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BOLINGBROOK, BOURBONNAIS, BUFFALO GROVE, BYRON, CAROL STREAM, CHICAGO, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, DOWNERS GROVE, DWIGHT, ELGIN, EVANSTON, FAIRBURY, GARY, GURNEE, HAMMOND, JOLIET, KANKAKEE, LA SALLE, LEMONT, LOMBARD, MARSEILLES, MCHENRY, MENDOTA, MERRILLVILLE, MINOOKA, MORRIS, MUNDELEIN, NAPERVILLE, OAK LAWN, OREGON, ORLAND PARK, OSWEGO, OTTAWA, PARK FOREST, PLANO, PONTIAC, ROCHELLE, ROCKFORD, SCHAUMBURG, STREATOR, SYCAMORE, WAUKEGAN, WHEATON, WILMINGTON, WOODSTOCK, AND YORKVILLE.