051
FZUS63 KMQT 062001
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 PM EDT THU AUG 6 2026
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 30.1 INCH HIGH OVER THE UPPER GREAT LAKES TODAY KEEPS 30.0 INCH
RIDGING OVER LAKE SUPERIOR UNTIL TONIGHT AS THE WEAK HIGH TRAVELS
EAST TOWARDS THE ST. LAWRENCE RIVER. BY FRIDAY, A COLD FRONT BRINGS
29.8 INCH TROUGHING ACROSS THE LAKE BEFORE 29.9 INCH RIDGING RETURNS
WITH A HIGH DIGGING TOWARDS THE OHIO RIVER VALLEY LATE FRIDAY NIGHT
INTO SATURDAY. WHILE SOME WEAK 29.8 INCH TROUGHING COULD BE SEEN
OVER LAKE SUPERIOR SATURDAY NIGHT, WEAK 29.9 INCH RIDGING SETTLES
ONCE AGAIN OVER THE LAKE SUNDAY AND MONDAY, WITH A WEAK 29.8 INCH
TROUGH POTENTIALLY PASSING THROUGH SUNDAY EVENING. THE HIGH PRESSURE
RIDGING COULD INCREASE TO 30.0 INCHES BY TUESDAY.
LSZ162-070800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 PM EDT THU AUG 6 2026 /301 PM CDT THU AUG 6 2026/
LATE THIS AFTERNOON
SOUTH WINDS 15 TO 25 KNOTS. WAVES 1 TO
3 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 10 TO 20 KNOTS LATE.
WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST LATE. A
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES SUBSIDING TO CALM TO
2 FEET.
FRIDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT, THEN BACKING WEST LATE. WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
SUNDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES CALM
TO 2 FEET.
TUESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM
TO 2 FEET.
LSZ263-070800-
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 6 2026
LATE THIS AFTERNOON
SOUTH WINDS 15 TO 25 KNOTS. WAVES 3 TO
5 FEET OCCASIONALLY TO 7 FEET SUBSIDING TO 2 TO 4 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT, THEN VEERING SOUTHWEST LATE. WAVES
SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO
15 KNOTS LATE. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES
SUBSIDING TO CALM TO 2 FEET.
FRIDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT, THEN BACKING WEST LATE. WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING WEST LESS THAN
10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
TUESDAY
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
LSZ264-070800-
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 6 2026
LATE THIS AFTERNOON
SOUTH WINDS 15 TO 25 KNOTS. WAVES 3 TO
5 FEET OCCASIONALLY TO 7 FEET SUBSIDING TO 2 TO 4 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT, THEN VEERING SOUTHWEST LATE. WAVES
SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO 4 FEET.
FRIDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS IN THE AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS.
WAVES SUBSIDING TO CALM TO 2 FEET.
FRIDAY NIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER
MIDNIGHT, THEN BACKING WEST LATE. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS
THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM
TO 2 FEET.
TUESDAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
LSZ265-070800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 PM EDT THU AUG 6 2026
LATE THIS AFTERNOON
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 2 TO
4 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING EAST LATE. SHOWERS
LIKELY AND A CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES CALM
TO 2 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST AFTER
MIDNIGHT, THEN INCREASING TO 15 TO 25 KNOTS LATE. A CHANCE OF
THUNDERSTORMS AND A SLIGHT CHANCE OF SHOWERS THROUGH MIDNIGHT.
WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN
SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
NORTHEAST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES CALM
TO 2 FEET.
TUESDAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM
TO 2 FEET.
LSZ266-070800-
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 6 2026
LATE THIS AFTERNOON
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
FRIDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS IN THE AFTERNOON, THEN BACKING SOUTHEAST LATE. A CHANCE
OF SHOWERS AND THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO
CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHWEST
LATE. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS THROUGH
MIDNIGHT, THEN A SLIGHT CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES
CALM TO 2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
BY MID AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES
CALM TO 2 FEET.
TUESDAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
LSZ267-070800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 PM EDT THU AUG 6 2026
LATE THIS AFTERNOON
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
IN THE AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES
SUBSIDING TO CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS VEERING WEST LATE.
SHOWERS THROUGH MIDNIGHT. A CHANCE OF THUNDERSTORMS. A CHANCE OF
SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES CALM
TO 2 FEET.
TUESDAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
LSZ261-070200-
MAFOR 0621/
SUPERIOR WEST 12420 11430 11530 12520 11510 11616. A CHANCE OF
THUNDERSTORMS FRIDAY AFTERNOON. WAVES 1 TO 3 FEET.
SUPERIOR NORTH CENTRAL 13420 11430 11420 11520 12410. A CHANCE OF
SHOWERS FRIDAY AFTERNOON. WAVES 2 TO 4 FEET SUBSIDING TO 1 TO 3
FEET, THEN BUILDING TO 2 TO 4 FEET TONIGHT. WAVES 2 TO 4 FEET
SUBSIDING TO 1 TO 3 FEET FRIDAY.
SUPERIOR SOUTH CENTRAL 11320 12440 12430 12420 11320. A CHANCE OF
SHOWERS FRIDAY AFTERNOON. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4
FEET TONIGHT. WAVES 1 TO 3 FEET FRIDAY.
SUPERIOR EAST 11310 11420 12430 13420 11410. WAVES 1 TO 3 FEET
BUILDING TO 2 TO 4 FEET TONIGHT. WAVES 2 TO 4 FEET SUBSIDING TO 1
TO 3 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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