978
FZUS63 KMQT 161401
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1001 AM 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 30.2 INCH HIGH SHIFTING SOUTH INTO NEW ENGLAND WILL MAINTAIN 30.1
INCH RIDGING OVER THE LAKE TODAY. A 29.7 INCH LOW MOVING THROUGH FAR
NORTHERN ONTARIO INTO THE HUDSON BAY AREA TONIGHT WILL BRING
TROUGHING OF 30.0 INCHES BACK TO LAKE SUPERIOR TUESDAY NIGHT THROUGH
WEDNESDAY, BEFORE A 30.3 INCH HIGH STRETCHING FROM THE CANADIAN
PRAIRIES TO NORTHERN ONTARIO BRINGS 30.1 INCH RIDGING BACK OVER LAKE
SUPERIOR WEDNESDAY NIGHT INTO THURSDAY MORNING. RIDGING IS EXPECTED
TO STRENGTHEN TO 30.3 INCHES ON FRIDAY AS THE HIGH DIGS THROUGH
NORTHERN ONTARIO TOWARDS THE ST. LAWRENCE SEAWAY. THE RIDGE WILL
WEAKEN TO 30.1 INCHES ON SATURDAY AS THE HIGH PRESSURE PUSHES AWAY
FROM THE AREA, INTO THE NORTHEASTERN U.S. TROUGHING THEN BEGINS TO
SPREAD OVER THE LAKE SUNDAY INTO THE BEGINNING OF NEXT WEEK AS LOW
PRESSURE DEEPENS OVER THE CANADIAN PRAIRIE TO AROUND 29.5 INCHES.
LSZ162-162000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1001 AM EDT TUE SEP 16 2025 /901 AM CDT TUE SEP 16 2025/
REST OF TODAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST
LATE. WAVES CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST LATE. PATCHY
FOG. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO
2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST LATE. A
SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS. A SLIGHT
CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES BUILDING TO 2 TO
4 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING
TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET, THEN 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.
LSZ263-162000-
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-
1001 AM EDT TUE SEP 16 2025
REST OF TODAY
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
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF
SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES
CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING 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, THEN 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.
LSZ264-162000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT TUE SEP 16 2025
REST OF TODAY
SOUTH WINDS 5 TO 15 KNOTS. WAVES 1 TO 3 FEET
SUBSIDING TO CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING WEST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. PATCHY FOG AFTER MIDNIGHT.
WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. A SLIGHT CHANCE OF SHOWERS 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. 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 BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET,
THEN SUBSIDING TO 1 TO 3 FEET.
LSZ265-162000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1001 AM EDT TUE SEP 16 2025
REST OF TODAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN
THE AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT, THEN DIMINISHING TO 5 TO 15 KNOTS LATE. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
WEDNESDAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTH LATE. A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF
SHOWERS. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS BECOMING EAST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST. WAVES CALM
TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
LSZ266-162000-
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-
1001 AM EDT TUE SEP 16 2025
REST OF TODAY
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. PATCHY FOG AFTER MIDNIGHT. A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO
4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
WEDNESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST
LATE. PATCHY FOG THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF
SHOWERS THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
LSZ267-162000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT TUE SEP 16 2025
REST OF TODAY
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS IN THE AFTERNOON, THEN VEERING WEST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING NORTH
10 TO 20 KNOTS AFTER MIDNIGHT. 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 NORTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST. WAVES
BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS.
WAVES 1 TO 3 FEET.
LSZ261-162000-
MAFOR 1615/
SUPERIOR WEST 12400 11300 11410 12510 12600. WAVES 2 FEET OR
LESS.
SUPERIOR NORTH CENTRAL 14410 12510 12610. WAVES 1 TO 3 FEET.
SUPERIOR SOUTH CENTRAL 11410 12310 11410 11420 11510 12500. WAVES
1 TO 3 FEET THIS AFTERNOON AND TONIGHT. WAVES 2 FEET OR LESS
WEDNESDAY MORNING.
SUPERIOR EAST 13310 13420 12510. 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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