LMZ740>742-210915-
Winthrop Harbor to Wilmette Harbor IL-
Wilmette Harbor to Northerly Island IL-
Northerly Island to Calumet Harbor IL-
838 PM CDT Mon Jul 20 2026
SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 AM CDT TUESDAY
REST OF TONIGHT
Southwest winds 15 to 20 kt increasing to 20
to 25 kt late in the evening, then becoming west late. Chance of
showers and thunderstorms after midnight. Waves 1 to 3 ft.
TUESDAY
West winds 10 to 20 kt becoming northwest in the
afternoon and increasing to 15 to 25 kt late. Mostly sunny in the
morning, then becoming partly cloudy. Waves 1 to 3 ft building to
2 to 4 ft.
TUESDAY NIGHT
North winds 20 to 25 kt. Slight chance of
showers and thunderstorms in the evening. Waves 4 to 6 ft
occasionally to 8 ft building to 5 to 8 ft occasionally to 10 ft.
A small craft advisory will likely be needed.
WEDNESDAY
North winds 15 to 25 kt. Mostly sunny. Waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft. A small craft advisory will likely be needed.
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