388
FZUS63 KMQT 081401
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1001 AM EDT THU MAY 8 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
RIDGING OVER LAKE SUPERIOR SLOWLY WEAKENS TO 30.2 INCHES
INTO FRIDAY AS A 30.1 INCH TROUGH APPROACHES FROM THE WEST. THIS
TROUGH PASSES OVER LAKE SUPERIOR LATE FRIDAY BEFORE QUICKLY BEING
REPLACED BY 30.3 INCH HIGH PRESSURE RIDGING SATURDAY AND SATURDAY
NIGHT AS THE 30.4 INCH PARENT HIGH TRACKS EAST OVER ONTARIO TOWARDS
THE LOWER GREAT LAKES THIS WEEKEND. RIDGING WEAKENS TO 30.0 INCHES
ON SUNDAY AS TROUGHING DEVELOPS TO THE NORTHWEST. ON MONDAY, LAKE
SUPERIOR BECOMES SANDWICHED BETWEEN A 29.4 INCH LOW PRESSURE OVER
THE NORTHERN PLAINS AND THE AFOREMENTIONED 30.4 INCH HIGH PRESSURE
NOW DEPARTING EAST INTO THE ATLANTIC.
LSZ162-082000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1001 AM EDT THU MAY 8 2025 /901 AM CDT THU MAY 8 2025/
REST OF TODAY
EAST WINDS 10 TO 20 KNOTS BACKING NORTHEAST IN
THE AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET.
TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTHWEST LATE.
WAVES SUBSIDING TO CALM TO 2 FEET.
FRIDAY
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS THROUGH MIDNIGHT.
WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET.
MONDAY
SOUTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET.
LSZ263-082000-
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-
1001 AM EDT THU MAY 8 2025
REST OF TODAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST IN
THE AFTERNOON. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET, THEN
SUBSIDING TO CALM TO 2 FEET.
TONIGHT
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST LESS THAN
10 KNOTS AFTER MIDNIGHT, THEN BECOMING SOUTHWEST 5 TO 15 KNOTS
LATE. WAVES CALM TO 2 FEET.
FRIDAY
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN
SUBSIDING TO 1 TO 3 FEET.
FRIDAY NIGHT
WEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. WAVES
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
SATURDAY
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST BY MID
AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. WAVES
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO
4 FEET.
LSZ264-082000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT THU MAY 8 2025
REST OF TODAY
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH LESS THAN
10 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 5 TO 15 KNOTS LATE.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
RAIN SHOWERS THROUGH MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET,
THEN BUILDING TO 2 TO 4 FEET.
SATURDAY
NORTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST. WAVES
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY
SOUTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 2 TO
4 FEET.
LSZ265-082000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1001 AM EDT THU MAY 8 2025
REST OF TODAY
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS LATE. WAVES 1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET.
TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS LATE. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SATURDAY
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
SATURDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST 15 TO
25 KNOTS. WAVES CALM TO 2 FEET.
MONDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
LSZ266-082000-
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-
1001 AM EDT THU MAY 8 2025
REST OF TODAY
EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST
5 TO 15 KNOTS IN THE AFTERNOON, THEN BACKING NORTH LATE. WAVES
1 TO 3 FEET SUBSIDING TO CALM TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS BECOMING SOUTH LESS THAN
10 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 5 TO 15 KNOTS LATE.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BECOMING NORTH 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY
NORTH WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
SATURDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
MONDAY
SOUTH WINDS 15 TO 25 KNOTS. WAVES 2 TO 4 FEET.
LSZ267-082000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT THU MAY 8 2025
REST OF TODAY
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH IN
THE AFTERNOON, THEN BECOMING NORTHWEST 10 TO 20 KNOTS LATE. WAVES
CALM TO 2 FEET.
TONIGHT
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST LATE.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST LATE. WAVES
CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS BACKING NORTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM
TO 2 FEET.
SATURDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHEAST
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 2 TO
4 FEET.
MONDAY
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS. WAVES SUBSIDING TO 1 TO 3 FEET, THEN BUILDING TO 2 TO
4 FEET.
LSZ261-082000-
MAFOR 0815/
SUPERIOR WEST 14110 11100 11800 11600 11500. WAVES 1 TO 2 FEET.
SUPERIOR NORTH CENTRAL 11210 12200 11300 13400 11510. WAVES 2
FEET OR LESS.
SUPERIOR SOUTH CENTRAL 11210 11110 11100 11200 11300 13400. WAVES
2 TO 3 FEET THIS AFTERNOON. WAVES 2 FEET OR LESS TONIGHT AND
FRIDAY MORNING.
SUPERIOR EAST 11100 11800 11710 12700 12500 11400. 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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