856
FZUS63 KMQT 101402
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1002 AM EDT THU JUL 10 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 WEAK 30.0 INCH RIDGE OVER LAKE SUPERIOR GRADUALLY WEAKENS AND
SLOWLY DRIFTS EAST THROUGH THE DAY TODAY. FRIDAY MORNING THROUGH
SATURDAY AFTERNOON, A 29.8 INCH TROUGH WILL MOVE ACROSS THE LAKE,
FIRST ASSOCIATED WITH A 29.6 INCH LOW OVER HUDSON BAY BUT BY
SATURDAY MORNING, THE TROUGH WILL BE ASSOCIATED WITH A SECONDARY
29.8 INCH LOW OVER NORTHERN ONTARIO. THIS LOW DEEPENS TO 29.7 INCHES
SATURDAY NIGHT AS IT DRIFTS NORTHEAST TOWARDS HUDSON BAY WHILE 30.0
INCH HIGH PRESSURE BUILDS JUST SOUTH OF THE GREAT LAKES BASIN. THE
HIGH MAINTAINS STRENGTH AND POSITION SUNDAY WHILE THE LOW DEEPENS TO
29.4 INCHES OVER HUDSON BAY. MONDAY, LAKE SUPERIOR WILL BE BETWEEN
HIGH PRESSURE OF 30.0 INCHES OVER MUCH OF THE EASTERN CONUS AND
BROAD 29.8 INCH TROUGHING OVER THE NORTHERN PLAINS. THIS TROUGH
REACHES LAKE SUPERIOR ON TUESDAY.
LSZ162-102000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1002 AM EDT THU JUL 10 2025 /902 AM CDT THU JUL 10 2025/
REST OF TODAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST IN
THE AFTERNOON. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS BY
MID AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST LATE. A
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES
CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS THROUGH
EARLY AFTERNOON, THEN SHOWERS LIKELY AND A CHANCE OF
THUNDERSTORMS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS BACKING WEST AFTER
MIDNIGHT. SHOWERS LIKELY THROUGH MIDNIGHT. A CHANCE OF
THUNDERSTORMS. A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
SATURDAY
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND A
SLIGHT CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES CALM TO 2 FEET.
LSZ263-102000-
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-
1002 AM EDT THU JUL 10 2025
REST OF TODAY
SOUTHEAST WINDS LESS THAN 10 KNOTS BECOMING EAST
5 TO 15 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT, THEN DIMINISHING TO LESS THAN 10 KNOTS LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
FRIDAY
SOUTHWEST WINDS LESS THAN 10 KNOTS BACKING SOUTH IN THE
AFTERNOON, THEN BECOMING EAST 5 TO 15 KNOTS LATE. A CHANCE OF
SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS BY MID AFTERNOON. WAVES
CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER
MIDNIGHT. SHOWERS LIKELY THROUGH MIDNIGHT. A CHANCE OF
THUNDERSTORMS. A CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
SATURDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM
TO 2 FEET.
LSZ264-102000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1002 AM EDT THU JUL 10 2025
REST OF TODAY
SOUTHEAST WINDS LESS THAN 10 KNOTS INCREASING TO
5 TO 15 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN
10 KNOTS IN THE AFTERNOON, THEN BECOMING SOUTHEAST 5 TO 15 KNOTS
LATE. A CHANCE OF SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS BY
MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. SHOWERS LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS.
WAVES CALM TO 2 FEET.
SATURDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM
TO 2 FEET.
LSZ265-102000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1002 AM EDT THU JUL 10 2025
REST OF TODAY
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO
10 TO 20 KNOTS LATE. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE
AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. A CHANCE OF
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS BY MID AFTERNOON.
WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. SHOWERS LIKELY AND A SLIGHT CHANCE OF
THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST BY MID
AFTERNOON. A CHANCE OF SHOWERS AND A SLIGHT CHANCE OF
THUNDERSTORMS. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES CALM
TO 2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
LSZ266-102000-
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-
1002 AM EDT THU JUL 10 2025
REST OF TODAY
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING EAST LATE.
WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST IN THE
AFTERNOON, THEN INCREASING TO 10 TO 20 KNOTS LATE. A SLIGHT
CHANCE OF SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS. SHOWERS LIKELY AND A
SLIGHT CHANCE OF THUNDERSTORMS. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTH WINDS 10 TO 20 KNOTS. SHOWERS LIKELY THROUGH
EARLY AFTERNOON. A CHANCE OF THUNDERSTORMS. A CHANCE OF SHOWERS
BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES CALM TO 2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
MONDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
LSZ267-102000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1002 AM EDT THU JUL 10 2025
REST OF TODAY
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH IN THE
AFTERNOON, THEN VEERING NORTHEAST LATE. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES
CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF
SHOWERS. A SLIGHT CHANCE OF THUNDERSTORMS AFTER MIDNIGHT. WAVES
BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES
SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM
TO 2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO 15 KNOTS.
WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES
CALM TO 2 FEET.
LSZ261-102000-
MAFOR 1015/
SUPERIOR WEST 11200 11100 11210 12100 11200 11300 11500. WAVES 1
FOOT OR LESS.
SUPERIOR NORTH CENTRAL 11300 14310 11410 12400. WAVES 2 FEET OR
LESS.
SUPERIOR SOUTH CENTRAL 11300 13310 14410. WAVES 2 FEET OR LESS.
SUPERIOR EAST 11400 11500 11200 12300 11400 12410. WAVES 2 FEET
OR LESS.
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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