128
FZUS53 KLOT 172019
NSHLOT

Nearshore Marine Forecast
National Weather Service Chicago/Romeoville IL
319 PM CDT Sun Aug 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>742-180315-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
319 PM CDT Sun Aug 17 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY MORNING...

.TONIGHT...Northeast winds 10 to 20 kt becoming southeast 15 to
20 kt overnight. Partly cloudy in the evening, then becoming
mostly cloudy. Waves 3 to 6 ft occasionally to 8 ft.
.MONDAY...Southeast winds 15 to 20 kt diminishing to 10 to 15 kt.
Slight chance of showers in the morning, then chance of showers
and thunderstorms in the afternoon. Waves 4 to 6 ft occasionally
to 8 ft subsiding to 2 to 4 ft.
.MONDAY NIGHT...Southeast winds 10 to 15 kt becoming south
overnight. Chance of showers and thunderstorms in the evening,
then showers and thunderstorms likely overnight. Waves 1 to 3 ft.
.TUESDAY...Southwest winds 10 to 15 kt becoming northwest in the
afternoon. Chance of showers and thunderstorms in the morning,
then slight chance of showers and thunderstorms in the afternoon.
Waves 1 to 2 ft.

$$

LMZ743>745-180315-
Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN-
Burns Harbor to Michigan City IN-
319 PM CDT Sun Aug 17 2025

.TONIGHT...Northeast winds 10 to 15 kt becoming southeast 15 to
20 kt overnight. Partly cloudy in the evening, then becoming
mostly cloudy. Waves 2 to 4 ft building to 3 to 5 ft.
.MONDAY...Southeast winds 15 to 20 kt diminishing to 5 to 10 kt.
Chance of showers and thunderstorms in the afternoon. Waves 3 to 5
ft subsiding to 1 to 2 ft.
.MONDAY NIGHT...South winds 10 to 15 kt. Chance of showers and
slight chance of thunderstorms in the evening, then showers
likely and a chance of thunderstorms overnight. Waves around
1 ft.
.TUESDAY...Southwest winds 10 to 15 kt becoming west in the
afternoon. Chance of showers and thunderstorms. Waves around
1 ft.

$$

KJB