440
FZUS63 KMQT 171401
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1001 AM EDT THU SEP 17 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
30.2 INCH RIDGING OVER LAKE SUPERIOR THIS MORNING INCREASES TO 30.4
INCHES BY TONIGHT AND FRIDAY MORNING AS THE PARENT HIGH MOVES FROM
THE CANADIAN PRAIRIES TO NORTHERN ONTARIO. WHILE THE HIGH DOES
WEAKEN BACK DOWN TO 30.3 INCHES OVER QUEBEC ON SATURDAY, 30.1 INCH
REMNANT RIDGING STILL REMAINS OVER THE LAKE. ANOTHER HIGH PRESSURE
DIGGING DOWN FROM MANITOBA BRINGS 30.4 INCH RIDGING BACK OVER LAKE
SUPERIOR SUNDAY NIGHT INTO MONDAY MORNING. THE HIGH INTENSIFIES TO
30.6 INCHES AS IT MOVES INTO QUEBEC ON TUESDAY, KEEPING 30.4 INCH
RIDGING OVERHEAD INTO THE MIDDLE OF NEXT WEEK.
LSZ162-172000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1001 AM EDT THU SEP 17 2026 /901 AM CDT THU SEP 17 2026/
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST IN
THE AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT, THEN BECOMING EAST 10 TO 20 KNOTS LATE. WAVES BUILDING
TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES 1 TO
3 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS.
WAVES 1 TO 3 FEET.
SATURDAY
EAST WINDS 15 TO 25 KNOTS BACKING NORTHEAST BY MID
AFTERNOON. A SLIGHT CHANCE OF SHOWERS THROUGH EARLY AFTERNOON.
WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SUNDAY
NORTHEAST GALES TO 35 KNOTS BECOMING EAST 20 TO
30 KNOTS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET,
THEN SUBSIDING TO 1 TO 3 FEET.
MONDAY
EAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO
2 TO 4 FEET.
LSZ263-172000-
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 SEP 17 2026
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
TONIGHT
WEST WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT, THEN VEERING EAST LATE. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
FRIDAY NIGHT
EAST WINDS 10 TO 20 KNOTS BECOMING SOUTHEAST 5 TO
15 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
SATURDAY
EAST WINDS 5 TO 15 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.
SATURDAY NIGHT
NORTHEAST WINDS 10 TO 20 KNOTS INCREASING TO
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SUNDAY
NORTHEAST WINDS 20 TO 30 KNOTS VEERING EAST. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO
CALM TO 2 FEET.
MONDAY
EAST WINDS 15 TO 25 KNOTS VEERING SOUTHEAST. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
LSZ264-172000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT THU SEP 17 2026
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING EAST LATE. WAVES
BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 5 TO 15 KNOTS BACKING EAST BY MID
AFTERNOON. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES
CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SUNDAY
NORTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST 5 TO
15 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO CALM
TO 2 FEET.
MONDAY
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
LSZ265-172000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1001 AM EDT THU SEP 17 2026
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST
10 TO 20 KNOTS LATE. WAVES CALM TO 2 FEET.
TONIGHT
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
LATE. WAVES 1 TO 3 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING EAST 10 TO
20 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 10 TO 20 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SUNDAY
NORTHEAST WINDS 20 TO 30 KNOTS BECOMING EAST 15 TO
25 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,
THEN SUBSIDING TO 1 TO 3 FEET.
MONDAY
EAST WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
LSZ266-172000-
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 SEP 17 2026
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST IN
THE AFTERNOON. WAVES CALM TO 2 FEET.
TONIGHT
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST LATE.
WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
IN THE AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING EAST 5 TO
15 KNOTS BY MID AFTERNOON. A SLIGHT CHANCE OF SHOWERS. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BECOMING NORTH 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SUNDAY
NORTHEAST WINDS 20 TO 30 KNOTS BECOMING EAST 15 TO
25 KNOTS. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET,
THEN SUBSIDING TO 2 TO 4 FEET.
MONDAY
EAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET.
LSZ267-172000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1001 AM EDT THU SEP 17 2026
REST OF TODAY
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST
10 TO 20 KNOTS LATE. WAVES CALM TO 2 FEET.
TONIGHT
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTHEAST LATE.
WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
IN THE AFTERNOON, THEN BACKING NORTHEAST LATE. WAVES SUBSIDING TO
CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
SATURDAY
SOUTHEAST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN
SUBSIDING TO CALM TO 2 FEET.
SATURDAY NIGHT
EAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER
MIDNIGHT. WAVES CALM TO 2 FEET.
SUNDAY
NORTH WINDS 10 TO 20 KNOTS BECOMING EAST 15 TO
25 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO
3 FEET.
MONDAY
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS.
WAVES SUBSIDING TO CALM TO 2 FEET.
LSZ261-172000-
MAFOR 1715/
SUPERIOR WEST 11600 12500 11600 11810 11120 12220. WAVES 1 FOOT
OR LESS THIS AFTERNOON. WAVES 1 TO 3 FEET TONIGHT AND FRIDAY
MORNING.
SUPERIOR NORTH CENTRAL 13610 11710 12110 12210. WAVES 1 TO 3
FEET.
SUPERIOR SOUTH CENTRAL 11710 11700 12710 11820 12120 11220. WAVES
1 FOOT OR LESS THIS AFTERNOON. WAVES 1 TO 3 FEET TONIGHT AND
FRIDAY MORNING.
SUPERIOR EAST 11600 11610 12710 11810 13110. WAVES 1 TO 3 FEET.
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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