355
FZUS63 KMQT 162001
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 PM EDT TUE SEP 16 2025
FOR WATERS BEYOND 5 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.
SYNOPSIS
A 29.7 INCH LOW MOVING OVER FAR NORTHERN ONTARIO INTO THE HUDSON BAY
AREA TONIGHT BRINGS A 30.0 INCH TROUGH OVER LAKE SUPERIOR TONIGHT
THROUGH WEDNESDAY. THEN A 30.3 INCH HIGH OVER MANITOBA GRADUALLY
SHIFTS OVER NORTHERN ONTARIO WEDNESDAY NIGHT THROUGH FRIDAY AND
ACROSS NEW ENGLAND ON SATURDAY. THIS BRINGS 30.2 INCH RIDGING BACK
OVER LAKE SUPERIOR BY FRIDAY, WEAKENING TO 30.0 INCHES BY THE END OF
THE DAY SATURDAY. TROUGHING THEN BEGINS TO SPREAD OVER LAKE SUPERIOR
SUNDAY INTO THE BEGINNING OF NEXT WEEK AS LOW PRESSURE DEEPENS OVER
THE CANADIAN PRAIRIE TO AROUND 29.5 INCHES.
LSZ162-170800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 PM EDT TUE SEP 16 2025 /301 PM CDT TUE SEP 16 2025/
LATE THIS AFTERNOON
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH MIDNIGHT. PATCHY FOG.
WAVES CALM TO 2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST IN THE
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES CALM TO
2 FEET.
WEDNESDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS LATE. A SLIGHT CHANCE OF THUNDERSTORMS THROUGH
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST BY MID
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH
EARLY AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
1 TO 3 FEET.
SATURDAY
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
LSZ263-170800-
LAKE SUPERIOR FROM SAXON HARBOR WI TO UPPER ENTRANCE TO PORTAGE
CANAL MI 5NM OFF SHORE TO THE US/CANADIAN BORDER INCLUDING ISLE
ROYALE NATIONAL PARK-
401 PM EDT TUE SEP 16 2025
LATE THIS AFTERNOON
SOUTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
WEDNESDAY
WEST WINDS LESS THAN 10 KNOTS. PATCHY FOG THROUGH
EARLY AFTERNOON. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.
THURSDAY NIGHT
EAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 2 TO
4 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
LSZ264-170800-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
401 PM EDT TUE SEP 16 2025
LATE THIS AFTERNOON
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES
CALM TO 2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN
10 KNOTS LATE. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES CALM TO
2 FEET.
WEDNESDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST
LATE. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO
1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET,
THEN SUBSIDING TO 1 TO 3 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ265-170800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 PM EDT TUE SEP 16 2025
LATE THIS AFTERNOON
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO
20 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 5 TO 15 KNOTS LATE.
A SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTH IN THE
AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH
EARLY AFTERNOON. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
LSZ266-170800-
LAKE SUPERIOR EAST OF A LINE FROM MANITOU ISLAND TO MARQUETTE MI
AND WEST OF A LINE FROM GRAND MARAIS MI TO THE US/CANADIAN BORDER
BEYOND 5NM FROM SHORE-
401 PM EDT TUE SEP 16 2025
LATE THIS AFTERNOON
SOUTH WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET SUBSIDING TO CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS LATE. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
WAVES BUILDING TO 1 TO 3 FEET.
WEDNESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST IN
THE AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
THROUGH EARLY AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
NORTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET,
THEN SUBSIDING TO 1 TO 3 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ267-170800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 PM EDT TUE SEP 16 2025
LATE THIS AFTERNOON
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO
CALM TO 2 FEET.
WEDNESDAY
SOUTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS IN THE AFTERNOON, THEN VEERING NORTHWEST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS AFTER MIDNIGHT, THEN VEERING NORTH LATE. WAVES
CALM TO 2 FEET.
THURSDAY
NORTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS VEERING EAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.
WAVES 1 TO 3 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ261-170200-
MAFOR 1621/
SUPERIOR WEST 11300 11410 11510 11500 13600 11500. WAVES 2 FEET
OR LESS.
SUPERIOR NORTH CENTRAL 11400 11410 12510 11610 11600 11700 11600.
WAVES 2 FEET OR LESS.
SUPERIOR SOUTH CENTRAL 11410 12420 11410 11500 11600 11700 11800.
A CHANCE OF SHOWERS OVERNIGHT. WAVES 1 TO 3 FEET TONIGHT. WAVES 2
FEET OR LESS WEDNESDAY.
SUPERIOR EAST 12410 12420 11410 11510 11500 11600. WAVES 1 TO 3
FEET.
WFO MQT
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/MQT/GLFTABLE
GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT:
WEATHER.GOV/GREATLAKES
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