311
FZUS63 KMQT 102002
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 PM 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 29.9 INCH RIDGE WILL REMAIN OVER LAKE SUPERIOR TONIGHT.
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.
LSZ162-110800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 PM EDT THU JUL 10 2025 /301 PM CDT THU JUL 10 2025/
LATE THIS AFTERNOON
NORTHEAST WINDS 5 TO 15 KNOTS. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST LATE.
PATCHY FOG AFTER MIDNIGHT. ISOLATED SHOWERS AND THUNDERSTORMS
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF SHOWERS
AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST
LATE. 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.
SUNDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. A CHANCE
OF SHOWERS. WAVES CALM TO 2 FEET.
TUESDAY
EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST. A CHANCE
OF SHOWERS. A CHANCE OF THUNDERSTORMS. SHOWERS LIKELY. WAVES CALM
TO 2 FEET.
LSZ263-110800-
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 JUL 10 2025
LATE THIS AFTERNOON
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER MIDNIGHT.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING EAST LATE. A SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER
MIDNIGHT, THEN VEERING SOUTHWEST LATE. 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.
SUNDAY NIGHT
SOUTHWEST WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
LSZ264-110800-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
401 PM EDT THU JUL 10 2025
LATE THIS AFTERNOON
SOUTHEAST WINDS 5 TO 15 KNOTS. 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 LATE. WAVES
CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE.
SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES CALM TO
2 FEET.
SATURDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. A CHANCE OF SHOWERS
AND 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. WAVES BUILDING TO 1 TO
3 FEET.
SUNDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES 1 TO 3 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. A CHANCE
OF SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH. A CHANCE OF
SHOWERS. WAVES CALM TO 2 FEET.
LSZ265-110800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 PM EDT THU JUL 10 2025
LATE THIS AFTERNOON
EAST WINDS 10 TO 20 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN THE
AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
LATE. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES CALM TO
2 FEET.
SATURDAY
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST BY MID
AFTERNOON. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON. A CHANCE
OF THUNDERSTORMS. SHOWERS LIKELY BY MID AFTERNOON. 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. WAVES CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH. WAVES
CALM TO 2 FEET.
TUESDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING NORTH. A CHANCE OF
SHOWERS AND THUNDERSTORMS. WAVES CALM TO 2 FEET.
LSZ266-110800-
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 JUL 10 2025
LATE THIS AFTERNOON
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN THE
AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH MIDNIGHT. A CHANCE OF
THUNDERSTORMS. SHOWERS LIKELY AFTER MIDNIGHT. WAVES BUILDING TO
1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SATURDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST BY MID
AFTERNOON. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON. A CHANCE
OF THUNDERSTORMS. SHOWERS LIKELY BY MID AFTERNOON. WAVES CALM TO
2 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS
THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN
SUBSIDING TO CALM TO 2 FEET.
SUNDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
TUESDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
LSZ267-110800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 PM EDT THU JUL 10 2025
LATE THIS AFTERNOON
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES CALM TO
2 FEET.
FRIDAY
SOUTHEAST WINDS 10 TO 20 KNOTS. 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
CALM TO 2 FEET.
SATURDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS
THROUGH EARLY AFTERNOON. A CHANCE OF THUNDERSTORMS. SHOWERS BY
MID AFTERNOON. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES 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 INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
TUESDAY
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS. WAVES
CALM TO 2 FEET.
LSZ261-110200-
MAFOR 1021/
SUPERIOR WEST 13100 11200 13300 11200. WAVES 1 FOOT OR LESS.
SUPERIOR NORTH CENTRAL 13310 12410 11400 11410 11310. WAVES 2
FEET OR LESS.
SUPERIOR SOUTH CENTRAL 11210 12310 13410 12310. WAVES 2 FEET OR
LESS.
SUPERIOR EAST 11200 12310 13410 12310. 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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