LMZ740>742-310345-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
254 PM CDT Thu Jul 30 2026
TONIGHT
Southeast winds around 10 kt becoming southwest late.
Mostly cloudy. Waves 1 ft or less.
FRIDAY
South winds 10 to 15 kt becoming southeast in the
afternoon. Chance of showers in the afternoon. Waves 1 ft or less
building to 1 to 2 ft.
FRIDAY NIGHT
Southeast winds 15 to 20 kt becoming east and
increasing to 20 to 25 kt. Showers and slight chance of
thunderstorms in the evening, then showers and a chance of
thunderstorms overnight. Waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft. A small craft advisory will likely be
needed.
SATURDAY
East winds 20 to 25 kt becoming northeast in the
afternoon. Showers and a chance of thunderstorms in the morning,
then showers likely and slight chance of thunderstorms in the
afternoon. Waves 4 to 7 ft occasionally to 9 ft.
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