580
FZUS63 KMQT 230201
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1000 PM EDT THU OCT 22 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
A 30.4 INCH HIGH PRESSURE OVER QUEBEC, EXTENDING A 30.2 INCH RIDGE
OVER LAKE SUPERIOR THROUGH THE REST OF THE WEEK, BUILDS TO 30.5
INCHES THROUGH FRIDAY NIGHT AS IT DROPS SOUTH TOWARDS NEW ENGLAND.
BY SATURDAY AFTERNOON, A 29.2 INCH LOW OVER NORTHERN MANITOBA DRAGS
A 30.1 INCH TROUGH OVER THE WEST HALF OF LAKE SUPERIOR. THE TROUGH
REMAINS OVER THE LAKE UNTIL SATURDAY NIGHT. HIGH PRESSURE OF AT
LEAST 30.6 INCHES OVER THE CANADIAN PRAIRIES ON SUNDAY AND MONDAY
PUSHES RIDGING OF AT LEAST 30.4 INCHES OVER THE UPPER GREAT LAKES ON
SUNDAY. THE RIDGING INTENSIFIES TO 30.6 INCHES MONDAY NIGHT INTO
TUESDAY MORNING AS THE HIGH'S CENTER MOVES OVERHEAD. THE HIGH
RETREATS EAST INTO NEW ENGLAND BY WEDNESDAY MORNING.
LSZ162-230800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1000 PM EDT THU OCT 22 2026 /900 PM CDT THU OCT 22 2026/
...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/
FRIDAY...
REST OF TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST
LATE. AREAS OF DENSE FOG. WAVES CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. PATCHY DENSE FOG THROUGH
EARLY AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH AFTER
MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. PATCHY FOG
THROUGH MIDNIGHT. WAVES BUILDING TO 1 TO 3 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS VEERING SOUTHWEST BY MID
AFTERNOON. A CHANCE OF SHOWERS. WAVES BUILDING TO 2 TO 4 FEET.
SATURDAY NIGHT
WEST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE OF
SHOWERS THROUGH MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS VEERING NORTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
MONDAY
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST. WAVES CALM
TO 2 FEET.
TUESDAY
EAST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES CALM TO 2 FEET.
LSZ263-230800-
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-
1000 PM EDT THU OCT 22 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT FRIDAY
REST OF TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
LATE. PATCHY DENSE FOG. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS DIMINISHING TO LESS THAN
10 KNOTS IN THE AFTERNOON, THEN BECOMING EAST 5 TO 15 KNOTS LATE.
PATCHY DENSE FOG THROUGH EARLY AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS THROUGH
MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 2 TO
4 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
MONDAY
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
TUESDAY
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES CALM TO
2 FEET.
LSZ264-230800-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1000 PM EDT THU OCT 22 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT FRIDAY
REST OF TONIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
LATE. PATCHY DENSE FOG 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 AFTER
MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS LATE. WAVES BUILDING
TO 2 TO 4 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS. A SLIGHT CHANCE OF
SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS THROUGH
MIDNIGHT. WAVES SUBSIDING TO 2 TO 4 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET, THEN BUILDING TO 2 TO 4 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTH
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
MONDAY
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
TUESDAY
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH. WAVES
CALM TO 2 FEET.
LSZ265-230800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1000 PM EDT THU OCT 22 2026
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT, THEN DIMINISHING TO 5 TO 15 KNOTS LATE. PATCHY
FOG. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
IN THE AFTERNOON, THEN BACKING SOUTHEAST LATE. PATCHY FOG THROUGH
EARLY AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO
25 KNOTS AFTER MIDNIGHT. WAVES 1 TO 3 FEET.
SATURDAY
SOUTH WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
SOUTH WINDS 20 TO 30 KNOTS BECOMING WEST 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
1 TO 3 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS. WAVES 1 TO 3 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH
AFTER MIDNIGHT. WAVES 1 TO 3 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
TUESDAY
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH. WAVES
CALM TO 2 FEET.
LSZ266-230800-
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-
1000 PM EDT THU OCT 22 2026
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT, THEN INCREASING TO 15 TO 25 KNOTS LATE. PATCHY
FOG. WAVES CALM TO 2 FEET BUILDING TO 1 TO 3 FEET.
FRIDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS LATE. PATCHY DENSE FOG THROUGH EARLY AFTERNOON. WAVES
1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
SATURDAY
SOUTH WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
SATURDAY NIGHT
SOUTH GALES TO 35 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET, THEN BUILDING TO 2 TO 4 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS VEERING NORTH
AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
TUESDAY
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
LSZ267-230800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1000 PM EDT THU OCT 22 2026
REST OF TONIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH
AFTER MIDNIGHT. PATCHY FOG BY MIDNIGHT, THEN AREAS OF DENSE FOG
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS IN THE AFTERNOON. AREAS OF DENSE FOG THROUGH EARLY
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 15 TO 25 KNOTS. WAVES 1 TO 3 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
SATURDAY NIGHT
SOUTH WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN SUBSIDING TO
2 TO 4 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO 1 TO
3 FEET, THEN BUILDING TO 2 TO 4 FEET.
SUNDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING NORTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES 2 TO 4 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
TUESDAY
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTH 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
LSZ261-230800-
MAFOR 2303/
SUPERIOR WEST 13200 19204 11304 11300 12200 11310. WAVES 2 FEET
OR LESS.
SUPERIOR NORTH CENTRAL 12310 11410 19414 12410 13310. WAVES 2
FEET OR LESS OVERNIGHT AND FRIDAY. WAVES 1 TO 3 FEET FRIDAY
EVENING.
SUPERIOR SOUTH CENTRAL 11320 14420 11420 12430. WAVES 1 TO 3
FEET.
SUPERIOR EAST 11314 11414 13424 11310 11320 11420. WAVES 2 FEET
OR LESS OVERNIGHT. WAVES 2 TO 3 FEET FRIDAY AND FRIDAY EVENING.
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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