974
FZUS53 KDLH 220400
NSHDLH
NEARSHORE MARINE FORECAST
NATIONAL WEATHER SERVICE DULUTH MN
1100 PM CDT TUE APR 21 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.
LSZ140-221000-
GRAND PORTAGE TO GRAND MARAIS MN-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
NORTHWEST WIND 5 KNOTS BECOMING EAST TOWARD
DAYBREAK. MOSTLY CLEAR. WAVES 1 FOOT OR LESS.
WEDNESDAY
EAST WIND 10 TO 15 KNOTS. SUNNY. WAVES 1 FOOT OR
LESS.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS. CHANCE OF RAIN AND SLIGHT CHANCE OF
THUNDERSTORMS AFTER MIDNIGHT. WAVES 1 TO 3 FEET BUILDING TO 2 TO
4 FEET AFTER MIDNIGHT.
THURSDAY
NORTHEAST WIND 15 TO 20 KNOTS. GUSTS UP TO 25 KNOTS
IN THE AFTERNOON. SLIGHT CHANCE OF RAIN IN THE AFTERNOON. WAVES
3 TO 5 FEET. WAVES OCCASIONALLY TO 7 FEET. A SMALL CRAFT ADVISORY
MAY BE NEEDED.
LSZ141-221000-
GRAND MARAIS TO TACONITE HARBOR MN-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
VARIABLE WINDS 10 KNOTS OR LESS BECOMING
NORTHEAST 5 KNOTS TOWARD DAYBREAK. MOSTLY CLEAR. WAVES 1 FOOT OR
LESS.
WEDNESDAY
EAST WIND 5 TO 10 KNOTS. SUNNY. WAVES 1 FOOT OR
LESS.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS WITH GUSTS TO
AROUND 20 KNOTS. SLIGHT CHANCE OF RAIN IN THE EVENING. SLIGHT
CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. CHANCE OF RAIN AFTER
MIDNIGHT. WAVES 1 TO 2 FEET BUILDING TO 2 TO 4 FEET IN THE LATE
EVENING AND OVERNIGHT.
THURSDAY
EAST WIND 15 TO 20 KNOTS. GUSTS UP TO 20 KNOTS
INCREASING TO 25 KNOTS IN THE LATE MORNING AND AFTERNOON. SLIGHT
CHANCE OF RAIN IN THE AFTERNOON. WAVES 3 TO 5 FEET. WAVES
OCCASIONALLY TO 7 FEET. A SMALL CRAFT ADVISORY MAY BE NEEDED.
LSZ142-221000-
TACONITE HARBOR TO SILVER BAY HARBOR MN-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
VARIABLE WINDS 10 KNOTS OR LESS BECOMING
NORTHEAST 5 KNOTS AFTER MIDNIGHT. MOSTLY CLEAR. WAVES 1 FOOT OR
LESS.
WEDNESDAY
NORTHEAST WIND 5 TO 10 KNOTS. SUNNY. WAVES 1 FOOT OR
LESS.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO
20 KNOTS AFTER MIDNIGHT. CHANCE OF RAIN AND SLIGHT CHANCE OF
THUNDERSTORMS THROUGH THE NIGHT. WAVES 1 TO 3 FEET BUILDING TO
2 TO 4 FEET AFTER MIDNIGHT.
THURSDAY
NORTHEAST WIND 15 TO 20 KNOTS. CHANCE OF RAIN. WAVES
3 TO 5 FEET. WAVES OCCASIONALLY TO 7 FEET. A SMALL CRAFT ADVISORY
MAY BE NEEDED.
LSZ143-221000-
SILVER BAY HARBOR TO TWO HARBORS MN-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
NORTHEAST WIND 5 KNOTS. MOSTLY CLEAR. WAVES
1 FOOT OR LESS.
WEDNESDAY
NORTHEAST WIND 10 TO 15 KNOTS. SUNNY. WAVES 1 TO
2 FEET.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO
20 KNOTS UNTIL EARLY MORNING. CHANCE OF RAIN IN THE EVENING.
SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE NIGHT. SLIGHT CHANCE
OF RAIN AFTER MIDNIGHT. WAVES 1 TO 2 FEET BUILDING TO 1 TO 3 FEET
AFTER MIDNIGHT.
THURSDAY
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
IN THE AFTERNOON. CHANCE OF RAIN AND SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON. WAVES 2 TO 4 FEET. A SMALL CRAFT
ADVISORY MAY BE NEEDED.
LSZ144-221000-
TWO HARBORS TO DULUTH MN-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
NORTHEAST WIND 5 KNOTS. MOSTLY CLEAR. WAVES
1 FOOT OR LESS.
WEDNESDAY
NORTHEAST WIND 10 TO 15 KNOTS. SUNNY. WAVES 1 TO
2 FEET.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO
20 KNOTS UNTIL EARLY MORNING. SLIGHT CHANCE OF RAIN AND
THUNDERSTORMS. WAVES 1 TO 3 FEET.
THURSDAY
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
IN THE LATE MORNING AND AFTERNOON. CHANCE OF RAIN AND SLIGHT
CHANCE OF THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO 3 FEET.
LSZ145-221000-
DULUTH MN TO PORT WING WI-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
NORTHEAST WIND 5 KNOTS. MOSTLY CLEAR. WAVES
1 FOOT OR LESS.
WEDNESDAY
NORTHEAST WIND 10 TO 15 KNOTS. SUNNY. WAVES 1 TO
2 FEET.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO
20 KNOTS UNTIL EARLY MORNING. SLIGHT CHANCE OF RAIN AND
THUNDERSTORMS. WAVES 1 TO 3 FEET.
THURSDAY
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 25 KNOTS.
CHANCE OF RAIN AND SLIGHT CHANCE OF THUNDERSTORMS IN THE
AFTERNOON. WAVES 1 TO 3 FEET.
LSZ146-221000-
PORT WING TO SAND ISLAND WI-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
VARIABLE WINDS 10 KNOTS OR LESS BECOMING EAST
5 KNOTS AFTER MIDNIGHT. MOSTLY CLEAR. WAVES 1 FOOT OR LESS.
WEDNESDAY
NORTHEAST WIND 10 TO 15 KNOTS. SUNNY. WAVES 1 TO
2 FEET.
WEDNESDAY NIGHT
NORTHEAST WIND 10 TO 15 KNOTS. SLIGHT CHANCE
OF RAIN AND THUNDERSTORMS THROUGH THE NIGHT. WAVES 1 TO 2 FEET.
THURSDAY
NORTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
IN THE AFTERNOON. CHANCE OF RAIN AND SLIGHT CHANCE OF
THUNDERSTORMS IN THE AFTERNOON. WAVES 1 TO 2 FEET BUILDING TO
2 TO 4 FEET LATE IN THE AFTERNOON.
LSZ147-221000-
SAND ISLAND TO BAYFIELD WI-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
VARIABLE WINDS 10 KNOTS OR LESS BECOMING
SOUTHEAST 5 KNOTS TOWARD DAYBREAK. MOSTLY CLEAR. WAVES 1 FOOT OR
LESS.
WEDNESDAY
SOUTHEAST WIND 5 KNOTS BECOMING EAST IN THE
AFTERNOON. SUNNY. WAVES 1 FOOT OR LESS.
WEDNESDAY NIGHT
EAST WIND 5 TO 10 KNOTS. SLIGHT CHANCE OF RAIN
AND THUNDERSTORMS THROUGH THE NIGHT. WAVES 1 TO 2 FEET.
THURSDAY
EAST WIND 5 TO 10 KNOTS. SLIGHT CHANCE OF RAIN. WAVES
1 TO 3 FEET BUILDING TO 2 TO 4 FEET LATE IN THE AFTERNOON.
LSZ150-221000-
OUTER APOSTLE ISLANDS BEYOND 5 NM FROM MAINLAND-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
EAST WIND 5 KNOTS. MOSTLY CLEAR. WAVES 1 FOOT
OR LESS.
WEDNESDAY
SOUTHEAST WIND 5 KNOTS BECOMING NORTHEAST IN THE
AFTERNOON. SUNNY. WAVES 1 TO 2 FEET.
WEDNESDAY NIGHT
EAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
EARLY IN THE EVENING. SLIGHT CHANCE OF RAIN AND THUNDERSTORMS
THROUGH THE NIGHT. WAVES 1 TO 2 FEET BUILDING TO 1 TO 3 FEET IN
THE LATE EVENING AND OVERNIGHT.
THURSDAY
EAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS IN THE
AFTERNOON. SLIGHT CHANCE OF RAIN IN THE AFTERNOON. WAVES 3 TO
5 FEET. A SMALL CRAFT ADVISORY MAY BE NEEDED.
LSZ121-221000-
CHEQUAMEGON BAY-BAYFIELD TO OAK POINT WI-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
VARIABLE WINDS 10 KNOTS OR LESS BECOMING
SOUTHEAST 5 KNOTS TOWARD DAYBREAK. CLEAR. WAVES 1 FOOT OR LESS.
WEDNESDAY
SOUTHEAST WIND 5 KNOTS BECOMING EAST IN THE
AFTERNOON. SUNNY. WAVES 1 FOOT OR LESS.
WEDNESDAY NIGHT
EAST WIND 5 KNOTS BECOMING SOUTHEAST AFTER
MIDNIGHT. SLIGHT CHANCE OF RAIN AND THUNDERSTORMS THROUGH THE
NIGHT. WAVES 1 FOOT OR LESS.
THURSDAY
SOUTHEAST WIND 5 TO 10 KNOTS. GUSTS UP TO 20 KNOTS IN
THE AFTERNOON. SLIGHT CHANCE OF RAIN. WAVES 1 FOOT OR LESS.
LSZ148-221000-
OAK POINT TO SAXON HARBOR WI-
1100 PM CDT TUE APR 21 2026
REST OF TONIGHT
SOUTHEAST WIND 5 KNOTS. CLEAR. WAVES 1 FOOT OR
LESS.
WEDNESDAY
SOUTHEAST WIND 5 KNOTS BECOMING EAST IN THE LATE
MORNING AND AFTERNOON. SUNNY. WAVES 1 FOOT OR LESS.
WEDNESDAY NIGHT
EAST WIND 5 TO 10 KNOTS BECOMING SOUTHEAST
AFTER MIDNIGHT. SLIGHT CHANCE OF RAIN AND THUNDERSTORMS THROUGH
THE NIGHT. WAVES 1 TO 2 FEET.
THURSDAY
SOUTHEAST WIND 10 TO 15 KNOTS. GUSTS UP TO 20 KNOTS
IN THE AFTERNOON. SLIGHT CHANCE OF RAIN. WAVES 1 TO 2 FEET.
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
WFO DLH
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