845
FZUS63 KMQT 110137
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
937 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 HOLDS OVER LAKE SUPERIOR TONIGHT. FRIDAY
MORNING THROUGH SATURDAY AFTERNOON, A 29.8 INCH TROUGH WILL MOVE
ACROSS THE LAKE. THIS TROUGH WILL FIRST BE 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 ON SUNDAY WHILE THE LOW DEEPENS TO 29.4 INCHES OVER HUDSON
BAY. ON 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.
LSZ162-110945-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
937 PM EDT THU JUL 10 2025 /837 PM CDT THU JUL 10 2025/
REST OF TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST
LATE. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST IN THE
AFTERNOON, THEN BACKING EAST LATE. A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST
LATE. A CHANCE OF SHOWERS AND THUNDERSTORMS. 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.
LSZ263-110945-
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-
937 PM EDT THU JUL 10 2025
REST OF TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH IN THE
AFTERNOON, THEN BACKING NORTHEAST LATE. A SLIGHT CHANCE OF
SHOWERS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST AFTER
MIDNIGHT, THEN VEERING SOUTHWEST LATE. A CHANCE OF SHOWERS 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
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.
LSZ264-110945-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
937 PM EDT THU JUL 10 2025
REST OF 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.
A CHANCE OF SHOWERS. 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.
LSZ265-110945-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
937 PM EDT THU JUL 10 2025
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT, THEN DIMINISHING TO 5 TO 15 KNOTS LATE. WAVES
CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS IN THE AFTERNOON, THEN BACKING EAST LATE. WAVES CALM TO
2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
LATE. A CHANCE OF SHOWERS. 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.
LSZ266-110945-
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-
937 PM EDT THU JUL 10 2025
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING EAST LATE. WAVES
CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. 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 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.
LSZ267-110945-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
937 PM EDT THU JUL 10 2025
REST OF 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 BACKING EAST IN THE
AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF
SHOWERS. 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.
LSZ261-110945-
MAFOR 1103/
SUPERIOR WEST 11100 11200 11300 11400 11300 11200 12100. A CHANCE
OF SHOWERS FRIDAY EVENING. WAVES 1 FOOT OR LESS.
SUPERIOR NORTH CENTRAL 11310 11410 12400 11410 13310. A CHANCE OF
SHOWERS FRIDAY EVENING. WAVES 2 FEET OR LESS.
SUPERIOR SOUTH CENTRAL 11310 13410 12310 11210 11310. A CHANCE OF
SHOWERS FRIDAY EVENING. WAVES 2 FEET OR LESS.
SUPERIOR EAST 11310 13410 11310 12210 11310. WAVES 2 FEET OR
LESS.
JABLONSKI
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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