Hazardous marine condition(s):
Hazardous Weather Outlook
LMZ740>742-182115-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
902 AM CDT Tue Aug 18 2026
REST OF TODAY
Southwest winds 10 to 15 kt increasing to 15 to
20 kt. Chance of showers in the morning. Chance of showers and
thunderstorms in the afternoon. Waves 1 to 2 ft.
TONIGHT
Southwest winds 10 to 15 kt becoming west overnight.
Showers likely and a chance of thunderstorms. Waves 1 to 2 ft.
WEDNESDAY
North winds around 10 kt becoming northeast in the
afternoon. Partly cloudy in the morning then clearing. Waves 1 to
2 ft.
WEDNESDAY NIGHT
East winds around 10 kt becoming around 5 kt.
Mostly clear in the evening, then becoming partly cloudy. Waves
1 to 2 ft.
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