Nearshore Marine Forecast
Issued by NWS Chicago, IL
Issued by NWS Chicago, IL
592 FZUS53 KLOT 200907 NSHLOT Nearshore Marine Forecast National Weather Service Chicago/Romeoville IL 407 AM CDT Sun Apr 20 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>742-201530- Winthrop Harbor to Wilmette Harbor IL- Wilmette Harbor to Northerly Island IL- Northerly Island to Calumet Harbor IL- 407 AM CDT Sun Apr 20 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH MONDAY MORNING... ...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH MONDAY EVENING... .TODAY...East winds 10 to 15 kt increasing to 15 to 25 kt this afternoon. Isolated showers in the morning, then scattered showers in the afternoon. Waves 1 to 3 ft building to 3 to 5 ft. .TONIGHT...East winds 20 to 25 kt becoming southeast to 30 kt overnight. Showers likely and slight chance of thunderstorms in the evening, then showers and a chance of thunderstorms overnight. Waves 4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to 10 ft. .MONDAY...Southwest gales to 35 kt becoming west in the afternoon. Chance of showers in the morning. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft late. .MONDAY NIGHT...West winds to 30 kt diminishing to 10 to 15 kt. Partly cloudy in the evening then clearing. Waves 2 to 4 ft subsiding to 1 to 2 ft. $$ LMZ743>745-201530- Calumet Harbor IL to Gary IN-Gary to Burns Harbor IN- Burns Harbor to Michigan City IN- 407 AM CDT Sun Apr 20 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH MONDAY MORNING... ...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH MONDAY EVENING... .TODAY...East winds 10 to 15 kt increasing to 15 to 20 kt. Isolated showers. Waves 1 to 3 ft building to 2 to 4 ft. .TONIGHT...East winds 20 to 25 kt becoming southeast to 30 kt overnight. Chance of showers in the evening, then showers and a chance of thunderstorms overnight. Waves 3 to 5 ft. .MONDAY...Southwest gales to 35 kt becoming west in the afternoon. Chance of showers in the morning. Waves 3 to 5 ft. .MONDAY NIGHT...West winds to 30 kt diminishing to 10 to 15 kt. Mostly cloudy in the evening then clearing. Waves 2 to 4 ft subsiding to 1 to 3 ft. $$ Yack