Hazardous marine condition(s):
Special Marine Warning
Marine Weather Statement
Hazardous Weather Outlook
LMZ740>742-190915-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
911 PM CDT Tue Aug 18 2026
REST OF TONIGHT
Southwest winds 10 to 20 kt becoming northwest
around 10 kt late. Showers with thunderstorms likely late in the
evening, then slight chance of showers after midnight. Waves 1 to
2 ft. Higher winds and waves in and near thunderstorms, including
a brief gusty northwest wind shift up to 30 kt.
WEDNESDAY
North winds around 10 kt becoming northeast in the
afternoon. Mostly cloudy. Waves 1 to 2 ft.
WEDNESDAY NIGHT
East winds around 10 kt becoming northeast.
Mostly cloudy in the evening then clearing. Waves 1 to 2 ft.
THURSDAY
East winds around 5 kt becoming southeast in the
afternoon. Sunny. Waves around 1 ft.
$$