National Weather Service Marine Forecast FZUS53 KLOT

FZUS53 KLOT 171458
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
958 AM CDT Thu Jul 17 2025

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>743-172130
Winthrop Harbor to Wilmette Harbor IL
Wilmette Harbor to Northerly Island IL
Northerly Island to Calumet Harbor IL
Calumet Harbor IL to Gary IN
958 AM CDT Thu Jul 17 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT

REST OF TODAY
North winds 15 to 20 kt. Mostly cloudy. Waves 3 to 6 ft occasionally to 8 ft.

TONIGHT
North winds 10 to 20 kt becoming northeast 10 to 15 kt. Partly cloudy in the evening then clearing. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft late.

FRIDAY
East winds around 10 kt. Mostly sunny. Waves 3 to 5 ft early in the morning subsiding to 1 to 3 ft by afternoon.

FRIDAY NIGHT
East winds around 10 kt becoming southeast overnight. Chance of showers and thunderstorms, mainly after midnight. Waves around 1 ft.

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LMZ744-745-172130
Gary to Burns Harbor IN-Burns Harbor to Michigan City IN
958 AM CDT Thu Jul 17 2025

SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT

REST OF TODAY
North winds 15 to 20 kt. Mostly cloudy. Waves 4 to 7 ft occasionally to 9 ft.

TONIGHT
North winds 10 to 20 kt becoming northeast 10 to 15 kt overnight. Mostly cloudy in the evening, then becoming partly cloudy. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft late.

FRIDAY
East winds 5 to 10 kt becoming northeast in the afternoon. Mostly sunny. Waves 3 to 5 ft early in the morning gradually subsiding to 1 to 2 ft in the afternoon.

FRIDAY NIGHT
East winds 5 to 10 kt becoming southeast overnight. Chance of showers and thunderstorms, mainly after midnight. Waves around 1 ft.

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Petr