663
FZUS53 KDLH 181118
NSHDLH
NEARSHORE MARINE FORECAST
NATIONAL WEATHER SERVICE DULUTH MN
617 AM CDT MON MAY 18 2026
FOR WATERS WITHIN FIVE NAUTICAL MILES OF SHORE ON LAKE SUPERIOR.
WAVES ARE THE SIGNIFICANT WAVE HEIGHT - THE AVERAGE OF THE HIGHEST
1/3 OF THE WAVE SPECTRUM. OCCASIONAL WAVE HEIGHT IS THE AVERAGE OF
THE HIGHEST 1/10 OF THE WAVE SPECTRUM.
LSZ140-181600-
GRAND PORTAGE TO GRAND MARAIS MN-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS IN
THE LATE MORNING AND EARLY AFTERNOON. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS EARLY IN THE MORNING, THEN SLIGHT
CHANCE OF RAIN SHOWERS LATE IN THE MORNING. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET LATE IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 15 TO 20 KNOTS. GUSTS UP TO 25 KNOTS.
CHANCE OF RAIN SHOWERS IN THE EVENING. SLIGHT CHANCE OF
THUNDERSTORMS THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT.
WAVES 1 TO 3 FEET BUILDING TO 4 TO 6 FEET IN THE LATE EVENING AND
OVERNIGHT. WAVES OCCASIONALLY TO 8 FEET. A SMALL CRAFT ADVISORY
MAY BE NEEDED.
TUESDAY
NORTH WIND 20 TO 25 KNOTS BECOMING NORTHWEST 10 TO
15 KNOTS WITH GUSTS TO AROUND 20 KNOTS IN THE AFTERNOON. CHANCE
OF RAIN SHOWERS IN THE MORNING. WAVES 4 TO 6 FEET SUBSIDING TO
1 TO 2 FEET. WAVES OCCASIONALLY TO 8 FEET. A SMALL CRAFT ADVISORY
MAY BE NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 10 TO 15 KNOTS. GUSTS UP TO
20 KNOTS IN THE EVENING. MOSTLY CLOUDY IN THE EVENING THEN
BECOMING PARTLY CLOUDY. WAVES 1 TO 2 FEET.
LSZ141-181600-
GRAND MARAIS TO TACONITE HARBOR MN-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 5 TO 10 KNOTS BECOMING WEST LATE IN THE
MORNING, THEN BECOMING SOUTHEAST EARLY IN THE AFTERNOON BECOMING
NORTHEAST LATE IN THE AFTERNOON. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS EARLY IN THE MORNING, THEN SLIGHT
CHANCE OF RAIN SHOWERS LATE IN THE MORNING. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
AFTER MIDNIGHT. CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS IN THE EVENING, THEN RAIN SHOWERS AFTER MIDNIGHT.
WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET AFTER MIDNIGHT.
TUESDAY
NORTH WIND 5 TO 10 KNOTS BECOMING NORTHWEST IN THE
AFTERNOON. GUSTS UP TO 20 KNOTS. CHANCE OF RAIN SHOWERS IN THE
MORNING. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET IN THE
AFTERNOON.
TUESDAY NIGHT
NORTHWEST WIND 5 TO 10 KNOTS. GUSTS UP TO
20 KNOTS EARLY IN THE EVENING. MOSTLY CLOUDY IN THE EVENING THEN
BECOMING PARTLY CLOUDY. WAVES 1 TO 2 FEET.
LSZ142-181600-
TACONITE HARBOR TO SILVER BAY HARBOR MN-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTH WIND 5 TO 10 KNOTS BECOMING NORTHWEST LATE IN THE
MORNING, THEN BECOMING SOUTHEAST EARLY IN THE AFTERNOON BECOMING
NORTHEAST LATE IN THE AFTERNOON. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS EARLY IN THE MORNING, THEN SLIGHT
CHANCE OF RAIN SHOWERS LATE IN THE MORNING. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS WITH GUSTS TO AROUND
20 KNOTS. CHANCE OF RAIN SHOWERS IN THE EVENING. SLIGHT CHANCE OF
THUNDERSTORMS THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT.
WAVES 1 TO 2 FEET BUILDING TO 2 TO 4 FEET AFTER MIDNIGHT. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTHWEST WIND 5 TO 10 KNOTS. GUSTS UP TO 20 KNOTS
LATE IN THE AFTERNOON. CHANCE OF RAIN SHOWERS IN THE MORNING.
WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET LATE IN THE AFTERNOON.
A SMALL CRAFT ADVISORY MAY BE NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 5 TO 10 KNOTS. GUSTS UP TO
20 KNOTS EARLY IN THE EVENING. MOSTLY CLOUDY IN THE EVENING THEN
BECOMING PARTLY CLOUDY. WAVES 1 TO 2 FEET.
LSZ143-181600-
SILVER BAY HARBOR TO TWO HARBORS MN-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 5 TO 10 KNOTS. CHANCE OF RAIN SHOWERS AND
SLIGHT CHANCE OF THUNDERSTORMS EARLY IN THE MORNING, THEN SLIGHT
CHANCE OF RAIN SHOWERS LATE IN THE MORNING. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
LATE IN THE EVENING INCREASING TO 25 KNOTS, THEN DECREASING TO
20 KNOTS EARLY IN THE MORNING. RAIN SHOWERS LIKELY IN THE
EVENING. SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. RAIN
SHOWERS AFTER MIDNIGHT. WAVES 1 TO 2 FEET BUILDING TO 2 TO 4 FEET
AFTER MIDNIGHT. A SMALL CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTH WIND 5 TO 10 KNOTS BECOMING NORTHWEST IN THE
LATE MORNING AND AFTERNOON. CHANCE OF RAIN SHOWERS IN THE
MORNING. WAVES 2 TO 4 FEET. A SMALL CRAFT ADVISORY MAY BE NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 5 TO 10 KNOTS. MOSTLY CLOUDY IN
THE EVENING THEN BECOMING PARTLY CLOUDY. WAVES 1 TO 2 FEET.
LSZ144-181600-
TWO HARBORS TO DULUTH MN-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 5 TO 10 KNOTS. CHANCE OF RAIN SHOWERS
EARLY IN THE MORNING. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET
IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
LATE IN THE EVENING INCREASING TO 25 KNOTS, THEN DECREASING TO
20 KNOTS EARLY IN THE MORNING. RAIN SHOWERS LIKELY IN THE
EVENING. SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. RAIN
SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET
AFTER MIDNIGHT.
TUESDAY
NORTHWEST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS IN
THE LATE MORNING AND AFTERNOON. CHANCE OF RAIN SHOWERS IN THE
MORNING. WAVES 2 TO 4 FEET.
TUESDAY NIGHT
NORTHWEST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS EASING TO 5 KNOTS AFTER MIDNIGHT. MOSTLY CLOUDY.
WAVES 1 TO 2 FEET.
LSZ145-181600-
DULUTH MN TO PORT WING WI-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 5 TO 10 KNOTS. CHANCE OF RAIN SHOWERS
EARLY IN THE MORNING. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 2 FEET
IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
LATE IN THE EVENING INCREASING TO 25 KNOTS, THEN DECREASING TO
20 KNOTS EARLY IN THE MORNING. RAIN SHOWERS LIKELY IN THE
EVENING. SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. RAIN
SHOWERS AFTER MIDNIGHT. WAVES 1 TO 2 FEET BUILDING TO 3 TO 5 FEET
IN THE LATE EVENING AND OVERNIGHT. A SMALL CRAFT ADVISORY MAY BE
NEEDED.
TUESDAY
NORTH WIND 10 TO 15 KNOTS BECOMING WEST IN THE LATE
MORNING AND AFTERNOON. GUSTS UP TO 20 KNOTS. CHANCE OF RAIN
SHOWERS IN THE MORNING. WAVES 2 TO 4 FEET.
TUESDAY NIGHT
NORTHWEST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS BECOMING WEST 5 KNOTS AFTER MIDNIGHT. MOSTLY
CLOUDY. WAVES 1 TO 2 FEET.
LSZ146-181600-
PORT WING TO SAND ISLAND WI-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTHEAST WIND 5 TO 10 KNOTS. CHANCE OF RAIN SHOWERS
EARLY IN THE MORNING, THEN SLIGHT CHANCE OF RAIN SHOWERS LATE IN
THE MORNING. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 2 FEET IN THE
AFTERNOON.
TONIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 25 KNOTS.
RAIN SHOWERS LIKELY IN THE EVENING. SLIGHT CHANCE OF
THUNDERSTORMS THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT.
WAVES 1 TO 2 FEET BUILDING TO 3 TO 5 FEET AFTER MIDNIGHT. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTH WIND 5 TO 10 KNOTS WITH GUSTS TO AROUND 20 KNOTS
BECOMING WEST WITH GUSTS TO AROUND 20 KNOTS IN THE LATE MORNING
AND AFTERNOON. CHANCE OF RAIN SHOWERS IN THE MORNING. WAVES 3 TO
5 FEET SUBSIDING TO 1 TO 3 FEET LATE IN THE AFTERNOON. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY NIGHT
WEST WIND 5 TO 10 KNOTS. MOSTLY CLOUDY. WAVES
1 TO 2 FEET.
LSZ147-181600-
SAND ISLAND TO BAYFIELD WI-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTH WIND 5 KNOTS BECOMING EAST LATE IN THE AFTERNOON.
CHANCE OF RAIN SHOWERS EARLY IN THE MORNING, THEN SLIGHT CHANCE
OF RAIN SHOWERS LATE IN THE MORNING. WAVES 2 TO 4 FEET SUBSIDING
TO 1 TO 2 FEET IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 15 TO 20 KNOTS WITH GUSTS TO AROUND
25 KNOTS. RAIN SHOWERS LIKELY IN THE EVENING. SLIGHT CHANCE OF
THUNDERSTORMS THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT.
WAVES 1 TO 3 FEET BUILDING TO 3 TO 5 FEET AFTER MIDNIGHT. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTH WIND 10 TO 15 KNOTS WITH GUSTS TO AROUND
20 KNOTS BECOMING WEST 5 TO 10 KNOTS WITH GUSTS TO AROUND
20 KNOTS IN THE LATE MORNING AND AFTERNOON. CHANCE OF RAIN
SHOWERS IN THE MORNING. WAVES 3 TO 5 FEET SUBSIDING TO 1 TO
3 FEET LATE IN THE AFTERNOON. A SMALL CRAFT ADVISORY MAY BE
NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 5 TO 10 KNOTS. GUSTS UP TO
20 KNOTS EARLY IN THE EVENING. MOSTLY CLOUDY IN THE EVENING THEN
BECOMING PARTLY CLOUDY. WAVES 1 TO 2 FEET.
LSZ150-181600-
OUTER APOSTLE ISLANDS BEYOND 5 NM FROM MAINLAND-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTH WIND 5 TO 10 KNOTS BECOMING NORTHEAST LATE IN THE
AFTERNOON. CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF
THUNDERSTORMS EARLY IN THE MORNING, THEN SLIGHT CHANCE OF RAIN
SHOWERS LATE IN THE MORNING. WAVES 3 TO 5 FEET SUBSIDING TO 1 TO
3 FEET IN THE AFTERNOON.
TONIGHT
NORTHEAST WIND 15 TO 20 KNOTS. GUSTS UP TO 20 KNOTS
INCREASING TO 25 KNOTS IN THE LATE EVENING AND OVERNIGHT. RAIN
SHOWERS LIKELY IN THE EVENING. SLIGHT CHANCE OF THUNDERSTORMS
THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET
BUILDING TO 4 TO 7 FEET IN THE LATE EVENING AND OVERNIGHT. WAVES
OCCASIONALLY TO 9 FEET. A SMALL CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTH WIND 10 TO 15 KNOTS WITH GUSTS TO AROUND
25 KNOTS BECOMING WEST 5 TO 10 KNOTS WITH GUSTS TO AROUND
20 KNOTS IN THE LATE MORNING AND AFTERNOON. CHANCE OF RAIN
SHOWERS IN THE MORNING. WAVES 4 TO 7 FEET SUBSIDING TO 2 TO
4 FEET LATE IN THE AFTERNOON. WAVES OCCASIONALLY TO 9 FEET. A
SMALL CRAFT ADVISORY MAY BE NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 5 TO 10 KNOTS. MOSTLY CLOUDY.
WAVES 1 TO 3 FEET.
LSZ121-181600-
CHEQUAMEGON BAY-BAYFIELD TO OAK POINT WI-
617 AM CDT MON MAY 18 2026
TODAY
NORTH WIND 5 KNOTS BECOMING NORTHEAST IN THE AFTERNOON.
CHANCE OF RAIN SHOWERS EARLY IN THE MORNING. WAVES 1 FOOT OR
LESS.
TONIGHT
NORTHEAST WIND 15 TO 20 KNOTS. GUSTS UP TO 25 KNOTS IN
THE LATE EVENING AND EARLY MORNING DECREASING TO 20 KNOTS. RAIN
SHOWERS LIKELY IN THE EVENING. SLIGHT CHANCE OF THUNDERSTORMS
THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO
2 FEET.
TUESDAY
NORTH WIND 10 TO 15 KNOTS WITH GUSTS TO AROUND
20 KNOTS BECOMING NORTHWEST WITH GUSTS TO AROUND 20 KNOTS IN THE
LATE MORNING AND AFTERNOON. CHANCE OF RAIN SHOWERS IN THE
MORNING. WAVES 1 TO 2 FEET.
TUESDAY NIGHT
NORTHWEST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS EASING TO 5 KNOTS AFTER MIDNIGHT. MOSTLY CLOUDY
IN THE EVENING THEN BECOMING PARTLY CLOUDY. WAVES 1 FOOT OR LESS.
LSZ148-181600-
OAK POINT TO SAXON HARBOR WI-
617 AM CDT MON MAY 18 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
TODAY
NORTH WIND 5 KNOTS BECOMING NORTHEAST IN THE AFTERNOON.
CHANCE OF RAIN SHOWERS EARLY IN THE MORNING. WAVES 1 TO 3 FEET.
TONIGHT
NORTHEAST WIND 15 TO 20 KNOTS. GUSTS UP TO 25 KNOTS IN
THE LATE EVENING AND EARLY MORNING DECREASING TO 20 KNOTS. RAIN
SHOWERS LIKELY IN THE EVENING. SLIGHT CHANCE OF THUNDERSTORMS
THROUGH THE NIGHT. RAIN SHOWERS AFTER MIDNIGHT. WAVES 1 TO 3 FEET
BUILDING TO 5 TO 8 FEET. WAVES OCCASIONALLY TO 10 FEET. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY
NORTH WIND 10 TO 15 KNOTS WITH GUSTS TO AROUND
20 KNOTS BECOMING NORTHWEST WITH GUSTS TO AROUND 20 KNOTS IN THE
LATE MORNING AND AFTERNOON. CHANCE OF RAIN SHOWERS IN THE
MORNING. WAVES 4 TO 6 FEET. WAVES OCCASIONALLY TO 8 FEET. A SMALL
CRAFT ADVISORY MAY BE NEEDED.
TUESDAY NIGHT
NORTHWEST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS EASING TO 5 KNOTS AFTER MIDNIGHT. MOSTLY CLOUDY.
WAVES 1 TO 3 FEET SUBSIDING TO 1 TO 2 FEET IN THE LATE EVENING
AND OVERNIGHT.
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
WFO DLH
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