888
FZUS53 KLOT 201318
NSHLOT
NEARSHORE MARINE FORECAST
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
818 AM CDT MON APR 20 2026
FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE MICHIGAN
WAVES ARE PROVIDED AS A RANGE OF SIGNIFICANT WAVE HEIGHTS, WHICH
IS THE AVERAGE OF THE HIGHEST 1/3 OF THE WAVES, ALONG WITH THE
AVERAGE HEIGHT OF THE HIGHEST 10 PERCENT OF THE WAVES WHICH WILL
OCCASIONALLY BE ENCOUNTERED.
LMZ740>742-202130-
WINTHROP HARBOR TO WILMETTE HARBOR IL-
WILMETTE HARBOR TO NORTHERLY ISLAND IL-
NORTHERLY ISLAND TO CALUMET HARBOR IL-
818 AM CDT MON APR 20 2026
REST OF TODAY
SOUTHEAST WINDS AROUND 5 KT INCREASING TO 10 TO
15 KT IN THE AFTERNOON. MOSTLY SUNNY. WAVES 1 FT OR LESS, BUILDING
TO 1 TO 3 FT.
TONIGHT
SOUTHEAST WINDS 10 TO 15 KT BECOMING SOUTH 15 TO 20 KT
OVERNIGHT. MOSTLY CLOUDY IN THE EVENING, THEN BECOMING PARTLY
CLOUDY. WAVES 2 TO 4 FT.
TUESDAY
SOUTHWEST WINDS 15 TO 25 KT. MOSTLY CLOUDY IN THE
MORNING, THEN BECOMING PARTLY CLOUDY. WAVES 2 TO 4 FT SUBSIDING
TO 1 TO 2 FT.
TUESDAY NIGHT
WEST WINDS 10 TO 15 KT BECOMING NORTHWEST
OVERNIGHT. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN THE
EVENING. WAVES 1 TO 2 FT.
LMZ743>745-202130-
CALUMET HARBOR IL TO GARY IN-GARY TO BURNS HARBOR IN-
BURNS HARBOR TO MICHIGAN CITY IN-
818 AM CDT MON APR 20 2026
REST OF TODAY
EAST WINDS AROUND 5 KT INCREASING TO 10 TO 15 KT
IN THE AFTERNOON. SUNNY. WAVES 1 TO 2 FT.
TONIGHT
SOUTHEAST WINDS 10 TO 15 KT BECOMING SOUTH AND
INCREASING TO 15 TO 25 KT OVERNIGHT. PARTLY CLOUDY. WAVES 1 TO
3 FT.
TUESDAY
SOUTHWEST WINDS 15 TO 25 KT INCREASING TO 20 TO 25 KT.
A SMALL CRAFT ADVISORY MAY BE NEEDED. PARTLY CLOUDY. WAVES 1 TO 3
FT.
TUESDAY NIGHT
SOUTHWEST WINDS 15 TO 20 KT DIMINISHING TO 10 TO
15 KT AND BECOMING WEST. CHANCE OF SHOWERS AND THUNDERSTORMS IN
THE EVENING. WAVES 1 TO 2 FT.
RATZER
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