974
FZUS63 KMQT 170801
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 AM EDT WED SEP 17 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 HUDSON BAY BRINGS A 30.0 INCH TROUGH
OVER LAKE SUPERIOR TODAY. THEN A 30.3 INCH HIGH OVER MANITOBA
GRADUALLY SHIFTS OVER NORTHERN ONTARIO WEDNESDAY NIGHT THROUGH
FRIDAY AND ACROSS NEW ENGLAND ON SATURDAY NIGHT. 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.
LSZ162-172000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 AM EDT WED SEP 17 2025 /301 AM CDT WED SEP 17 2025/
EARLY THIS MORNING
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TODAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST LATE. WAVES
CALM TO 2 FEET.
TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
THURSDAY
NORTHEAST WINDS 15 TO 25 KNOTS VEERING EAST IN THE
AFTERNOON, THEN DIMINISHING TO 10 TO 20 KNOTS LATE. WAVES
BUILDING TO 2 TO 4 FEET.
THURSDAY NIGHT
EAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO
CALM TO 2 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
CALM TO 2 FEET.
SATURDAY
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTHEAST. A CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
LSZ263-172000-
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 AM EDT WED SEP 17 2025
EARLY THIS MORNING
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TODAY
WEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN
10 KNOTS LATE. WAVES CALM TO 2 FEET.
TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS LATE. WAVES BUILDING TO 1 TO 3 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST LATE.
WAVES 1 TO 3 FEET.
THURSDAY NIGHT
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 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 CALM TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. A CHANCE
OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM
TO 2 FEET.
SUNDAY
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST. A CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
LSZ264-172000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
401 AM EDT WED SEP 17 2025
EARLY THIS MORNING
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TODAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS LATE. WAVES BUILDING TO 1 TO 3 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS LATE. WAVES SUBSIDING TO 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, THEN SUBSIDING TO 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 5 TO 15 KNOTS. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ265-172000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 AM EDT WED SEP 17 2025
EARLY THIS MORNING
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM
TO 2 FEET.
TODAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTH LATE. WAVES CALM
TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
LATE. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
1 TO 3 FEET, THEN SUBSIDING TO 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
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. 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 DIMINISHING TO 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
LSZ266-172000-
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 AM EDT WED SEP 17 2025
EARLY THIS MORNING
SOUTH WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET SUBSIDING TO CALM TO 2 FEET.
TODAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST IN THE
AFTERNOON. ISOLATED SHOWERS THROUGH EARLY AFTERNOON. WAVES CALM
TO 2 FEET.
TONIGHT
NORTHWEST WINDS 5 TO 15 KNOTS VEERING NORTH AFTER
MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES BUILDING
TO 1 TO 3 FEET.
THURSDAY
NORTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 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
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES CALM TO 2 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.
LSZ267-172000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 AM EDT WED SEP 17 2025
EARLY THIS MORNING
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
TODAY
SOUTH WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO 15 KNOTS
IN THE AFTERNOON, THEN BECOMING NORTHWEST 10 TO 20 KNOTS LATE.
ISOLATED SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
TONIGHT
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH LATE.
WAVES CALM TO 2 FEET.
THURSDAY
NORTH WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. 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. A CHANCE OF SHOWERS.
WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
SUNDAY
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
LSZ261-171400-
MAFOR 1709/
SUPERIOR WEST 11610 12600 12500 11100 11110 11120. WAVES 2 FEET
OR LESS.
SUPERIOR NORTH CENTRAL 11510 13610 11600 11710 12820. WAVES 1 TO
3 FEET.
SUPERIOR SOUTH CENTRAL 12510 11610 11810 11800 13810. WAVES 2
FEET OR LESS.
SUPERIOR EAST 11420 12510 11600 11700 12710 11810. 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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