421
FZUS53 KLOT 211952
NSHLOT
NEARSHORE MARINE FORECAST
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
252 PM CDT TUE APR 21 2026
FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN
WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVES, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.
LMZ740-220330-
WINTHROP HARBOR TO WILMETTE HARBOR IL-
252 PM CDT TUE APR 21 2026
TONIGHT
SOUTHWEST WINDS 15 TO 20 KT DIMINISHING TO 10 TO 15 KT
EARLY THIS EVENING, THEN BECOMING NORTH AFTER MIDNIGHT. AREAS OF
FOG POSSIBLE AFTER MIDNIGHT. WAVES 1 TO 3 FT.
WEDNESDAY
NORTH WINDS AROUND 10 KT BECOMING NORTHEAST. AREAS
OF DENSE FOG POSSIBLE IN THE MORNING, THEN PATCHY FOG IN THE
AFTERNOON. WAVES 1 TO 2 FT.
WEDNESDAY NIGHT
EAST WINDS AROUND 10 KT BECOMING SOUTH
OVERNIGHT. PARTLY CLOUDY. WAVES 1 TO 2 FT.
THURSDAY
SOUTH WINDS 10 TO 15 KT INCREASING TO 15 TO 20 KT.
PARTLY CLOUDY. WAVES 1 TO 3 FT.
LMZ741-742-220330-
WILMETTE HARBOR TO NORTHERLY ISLAND IL-
NORTHERLY ISLAND TO CALUMET HARBOR IL-
252 PM CDT TUE APR 21 2026
TONIGHT
SOUTHWEST WINDS 15 TO 25 KT DIMINISHING TO 10 TO 15 KT
EARLY, THEN BECOMING NORTH AFTER MIDNIGHT. AREAS OF FOG POSSIBLE
AFTER MIDNIGHT. WAVES 1 TO 3 FT.
WEDNESDAY
NORTH WINDS AROUND 10 KT BECOMING NORTHEAST. AREAS
OF DENSE FOG POSSIBLE IN THE MORNING, THEN PATCHY FOG IN THE
AFTERNOON. WAVES 1 TO 2 FT.
WEDNESDAY NIGHT
EAST WINDS AROUND 10 KT BECOMING SOUTH
OVERNIGHT. PARTLY CLOUDY. WAVES 1 TO 2 FT.
THURSDAY
SOUTH WINDS 10 TO 15 KT INCREASING TO 15 TO 20 KT.
PARTLY CLOUDY. WAVES 1 TO 3 FT.
LMZ743>745-220330-
CALUMET HARBOR IL TO GARY IN-GARY TO BURNS HARBOR IN-
BURNS HARBOR TO MICHIGAN CITY IN-
252 PM CDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING
TONIGHT
SOUTHWEST WINDS 20 TO 25 KT DIMINISHING TO 10 TO 20 KT
EARLY THIS EVENING, THEN BECOMING NORTHWEST AND DIMINISHING TO
AROUND 10 KT AFTER MIDNIGHT. CHANCE OF SHOWERS AND THUNDERSTORMS
IN THE EVENING. AREAS OF FOG AFTER MIDNIGHT. WAVES 1 TO 3 FT.
WEDNESDAY
NORTH WINDS AROUND 10 KT. AREAS OF FOG IN THE
MORNING, THEN PATCHY FOG IN THE AFTERNOON. WAVES AROUND 1 TO 2 FT.
WEDNESDAY NIGHT
EAST WINDS AROUND 10 KT BECOMING SOUTH
OVERNIGHT. PARTLY CLOUDY. WAVES AROUND 1 FT.
THURSDAY
SOUTH WINDS 10 TO 15 KT INCREASING TO 15 TO 20 KT.
PARTLY CLOUDY. WAVES 1 TO 2 FT.
RATZER
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