Hazardous marine condition(s):
Hazardous Weather Outlook
LMZ740>742-220915-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
920 PM CDT Tue Apr 21 2026
REST OF TONIGHT
Southwest winds around 10 kt becoming
north late. Areas of fog overnight. Waves 1 to 2 ft.
WEDNESDAY
North winds around 10 kt becoming northeast. Areas
of dense fog possible in the morning, then patchy fog in the
afternoon. Waves 1 to 2 ft.
WEDNESDAY NIGHT
East winds around 10 kt becoming south
overnight. Partly cloudy. Waves 1 to 2 ft.
THURSDAY
South winds 10 to 15 kt increasing to 15 to 20 kt.
Partly cloudy. Waves 1 to 3 ft.
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