Hazardous marine condition(s):
Severe Thunderstorm Watch
Hazardous Weather Outlook
LMZ740>742-111515-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
310 AM CDT Tue Aug 11 2026
TODAY
Northeast winds 5 to 10 kt early, becoming southeast 10
to 15 kts. Showers and thunderstorms, some may be severe. Waves
around 1 ft building to 1 to 2 ft. Winds and waves higher in and
near thunderstorms.
TONIGHT
Southeast winds around 10 kt becoming south around
5 kt. Partly cloudy in the evening, then becoming mostly cloudy.
Waves around 1 ft.
WEDNESDAY
South winds around 5 kt becoming east 5 to 10 kt in
the afternoon. Slight chance of showers and thunderstorms in the
morning, then chance of showers and thunderstorms in the
afternoon. Waves around 1 ft.
WEDNESDAY NIGHT
Northeast winds around 10 kt. Slight chance of
showers and thunderstorms. Waves around 1 ft.
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