139
FZUS63 KMQT 142001
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 PM EDT THU AUG 14 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
30.0 INCH RIDGING REMAINS OVER LAKE SUPERIOR THROUGH TONIGHT WHILE
WEAK TROUGHING OF 29.9 INCHES BUILDS IN FROM THE WEST THANKS TO A
29.5 INCH LOW PRESSURE MOVING FROM NORTHERN MANITOBA INTO ONTARIO
ALONG HUDSON BAY. TROUGHING WILL WEAKEN FRIDAY NIGHT AS A 30.2 INCH
HIGH BUILDS ACROSS MANITOBA. THIS HIGH PRESSES THROUGH ONTARIO AT
30.3 INCHES SUNDAY INTO MONDAY WHILE MAINTAINING 30.2 INCH RIDGING
OVER LAKE SUPERIOR.
LSZ162-150800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 PM EDT THU AUG 14 2025 /301 PM CDT THU AUG 14 2025/
LATE THIS AFTERNOON
EAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
TONIGHT
EAST WINDS 10 TO 20 KNOTS VEERING SOUTH AFTER
MIDNIGHT. A CHANCE OF THUNDERSTORMS AND A SLIGHT CHANCE OF
SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
SOUTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS LATE. A SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF
THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO
2 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST
AFTER MIDNIGHT, THEN VEERING NORTH LATE. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST BY MID
AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SUNDAY
EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
BY MID AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO
9 FEET.
SUNDAY NIGHT
EAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
2 TO 4 FEET.
MONDAY
NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET,
THEN BUILDING TO 2 TO 4 FEET.
TUESDAY
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
LSZ263-150800-
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 THU AUG 14 2025
LATE THIS AFTERNOON
EAST WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH AFTER
MIDNIGHT, THEN INCREASING TO 15 TO 25 KNOTS LATE. A SLIGHT CHANCE
OF SHOWERS AND THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET, THEN
SUBSIDING TO 1 TO 3 FEET.
FRIDAY
SOUTHWEST WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF
SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST AFTER
MIDNIGHT, THEN VEERING NORTH LATE. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY
NORTHEAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SUNDAY
EAST WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SUNDAY NIGHT
EAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
MONDAY
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
TUESDAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ264-150800-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
401 PM EDT THU AUG 14 2025
LATE THIS AFTERNOON
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO
25 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS LATE.
A SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS
AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST IN THE
AFTERNOON. A SLIGHT CHANCE OF SHOWERS. A SLIGHT CHANCE OF
THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST
LATE. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS.
WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY
NORTH WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF
THUNDERSTORMS THROUGH EARLY AFTERNOON. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
SATURDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
SUNDAY
NORTHEAST WINDS 15 TO 25 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
SUNDAY NIGHT
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
MONDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST. WAVES
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
TUESDAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTH. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ265-150800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 PM EDT THU AUG 14 2025
LATE THIS AFTERNOON
EAST WINDS 15 TO 25 KNOTS. WAVES 1 TO
3 FEET.
TONIGHT
SOUTHEAST WINDS 15 TO 25 KNOTS VEERING SOUTH AFTER
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO
2 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST LATE.
A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES
CALM TO 2 FEET.
SATURDAY
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT
CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SUNDAY
NORTHEAST WINDS 15 TO 25 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
SUNDAY NIGHT
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
MONDAY
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET,
THEN SUBSIDING TO CALM TO 2 FEET.
TUESDAY
EAST WINDS 10 TO 20 KNOTS BACKING NORTH. WAVES CALM TO
2 FEET.
LSZ266-150800-
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 THU AUG 14 2025
LATE THIS AFTERNOON
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET BUILDING TO 1 TO 3 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO
25 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
FRIDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS LATE. WAVES SUBSIDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT, THEN BECOMING WEST 5 TO 15 KNOTS LATE. A CHANCE
OF SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES SUBSIDING
TO CALM TO 2 FEET.
SATURDAY
NORTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS BY MID AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT
CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
SUNDAY
NORTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
SUNDAY 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.
MONDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST. A CHANCE
OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO
3 FEET.
TUESDAY
EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ267-150800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 PM EDT THU AUG 14 2025
LATE THIS AFTERNOON
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS. WAVES 1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES
SUBSIDING TO CALM TO 2 FEET.
SATURDAY
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. SHOWERS LIKELY AND A SLIGHT CHANCE OF
THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
SUNDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM
TO 2 FEET.
SUNDAY NIGHT
EAST WINDS 10 TO 20 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
MONDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING EAST. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
LSZ261-150200-
MAFOR 1421/
SUPERIOR WEST 11210 11320 13420 12520 11510. A CHANCE OF SHOWERS
OVERNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS FRIDAY MORNING.
WAVES 1 TO 3 FEET.
SUPERIOR NORTH CENTRAL 11320 12330 12430 12420 11520. WAVES 2 TO
4 FEET BUILDING TO 3 TO 5 FEET TONIGHT. WAVES 2 TO 4 FEET FRIDAY.
SUPERIOR SOUTH CENTRAL 11220 11320 11420 11430 14420. WAVES 2 TO
4 FEET TONIGHT. WAVES 1 TO 3 FEET FRIDAY.
SUPERIOR EAST 11210 11310 11320 14420 11420. WAVES 1 TO 3 FEET
TONIGHT. WAVES 2 TO 4 FEET FRIDAY.
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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