972
FZUS63 KMQT 212008 CCA
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR...CORRECTED
NATIONAL WEATHER SERVICE MARQUETTE MI
408 PM EDT WED OCT 21 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 WEAK 30.0 INCH TROUGH OVER THE LAKE WILL MOVE EAST TONIGHT AS
ANOTHER HIGH PRESSURE BUILDS IN FROM THE WEST IN ITS WAKE, BECOMING
CENTERED OVER NORTHERN ONTARIO AND THE UPPER GREAT LAKES BY THURSDAY
MORNING. BY FRIDAY AFTERNOON, THE HIGH BUILDS TO 30.5 INCHES OVER
THE ONTARIO/QUEBEC LINE AS A 29.4 INCH LOW MOVES INTO EASTERN
MONTANA. SATURDAY AFTERNOON, THE HIGH BUILDS FURTHER TO 30.6 INCHES
OVER NEW ENGLAND AS THE 29.4 INCH LOW MOVES JUST NORTH OF LAKE
WINNIPEG. THE LOW THEN LIFTS NORTHEAST TO HUDSON BAY ON SUNDAY
DRAGGING A 30.2 INCH TROUGH ACROSS THE LAKE. HIGH PRESSURE OF AT
LEAST 30.6 INCHES OVER THE CANADIAN PRAIRIES ON MONDAY PUSHES RIDGING
OF AT LEAST 30.4 INCHES OVER THE UPPER GREAT LAKES EARLY NEXT WEEK.
LSZ162-220800-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
408 PM EDT WED OCT 21 2026 /308 PM CDT WED OCT 21 2026/
LATE THIS AFTERNOON
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
NORTHEAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO LESS THAN 10 KNOTS
LATE. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS. PATCHY FOG. WAVES CALM TO
2 FEET.
THURSDAY NIGHT
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES BUILDING TO 2 TO 4 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS. A CHANCE OF SHOWERS BY
MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST
10 TO 20 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 1 TO 3 FEET.
SUNDAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES SUBSIDING
TO CALM TO 2 FEET.
MONDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
LSZ263-220800-
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-
408 PM EDT WED OCT 21 2026
LATE THIS AFTERNOON
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
NORTHEAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS LESS THAN 10 KNOTS INCREASING TO 5 TO
15 KNOTS IN THE AFTERNOON. PATCHY FOG. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
EAST WINDS 5 TO 15 KNOTS VEERING SOUTH LATE.
WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
SATURDAY
SOUTH WINDS 15 TO 25 KNOTS. WAVES BUILDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST
15 TO 25 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 2 TO 4 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO 15 KNOTS.
WAVES SUBSIDING TO CALM TO 2 FEET.
MONDAY
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
LSZ264-220800-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
408 PM EDT WED OCT 21 2026
LATE THIS AFTERNOON
NORTH WINDS 5 TO 15 KNOTS. WAVES CALM TO
2 FEET.
TONIGHT
NORTHEAST WINDS LESS THAN 10 KNOTS. WAVES CALM TO
2 FEET.
THURSDAY
EAST WINDS LESS THAN 10 KNOTS VEERING SOUTHEAST IN
THE AFTERNOON, THEN INCREASING TO 5 TO 15 KNOTS LATE. WAVES CALM
TO 2 FEET.
THURSDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
LATE. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 5 TO 15 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY NIGHT
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO
2 TO 4 FEET.
SATURDAY
SOUTH WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 4 TO
7 FEET OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
SOUTHWEST WINDS 15 TO 25 KNOTS VEERING WEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
SUNDAY
WEST WINDS 10 TO 20 KNOTS BECOMING NORTH 5 TO 15 KNOTS.
WAVES SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
MONDAY
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES CALM
TO 2 FEET.
LSZ265-220800-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
408 PM EDT WED OCT 21 2026
LATE THIS AFTERNOON
NORTH WINDS 5 TO 15 KNOTS. SPRINKLES.
WAVES CALM TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS
LATE. PATCHY FOG THROUGH EARLY AFTERNOON. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
SOUTHEAST WINDS 10 TO 20 KNOTS BECOMING SOUTH
5 TO 15 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 10 TO 20 KNOTS
LATE. AREAS OF DENSE FOG THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST BY MID
AFTERNOON. WAVES BUILDING TO 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. WAVES BUILDING TO 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 1 TO
3 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS VEERING NORTH. WAVES BUILDING
TO 2 TO 4 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
MONDAY
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. WAVES CALM TO 2 FEET.
LSZ266-220800-
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-
408 PM EDT WED OCT 21 2026
LATE THIS AFTERNOON
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS. PATCHY FOG. WAVES CALM TO
2 FEET.
THURSDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 15 TO 25 KNOTS
LATE. PATCHY DENSE FOG THROUGH MIDNIGHT. WAVES BUILDING TO 1 TO
3 FEET.
FRIDAY
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID 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 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
SATURDAY NIGHT
SOUTH GALES TO 40 KNOTS BECOMING SOUTHWEST
20 TO 30 KNOTS AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS VEERING NORTH. WAVES
SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ267-220800-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
408 PM EDT WED OCT 21 2026
LATE THIS AFTERNOON
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST AFTER
MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
NORTHEAST WINDS 5 TO 15 KNOTS VEERING EAST IN THE
AFTERNOON, THEN BACKING NORTHEAST LATE. PATCHY FOG THROUGH EARLY
AFTERNOON. WAVES CALM TO 2 FEET.
THURSDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS BECOMING SOUTH
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
FRIDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST BY MID
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 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
SATURDAY NIGHT
SOUTH WINDS 20 TO 30 KNOTS VEERING SOUTHWEST
AFTER MIDNIGHT. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 3 TO
5 FEET OCCASIONALLY TO 7 FEET.
SUNDAY
WEST WINDS 15 TO 25 KNOTS BECOMING NORTH 10 TO
20 KNOTS. A CHANCE OF SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET,
THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ261-220200-
MAFOR 2121/
SUPERIOR WEST 11800 14100 13200. WAVES 1 FOOT OR LESS.
SUPERIOR NORTH CENTRAL 12800 13100 11200 12300. WAVES 2 FEET OR
LESS.
SUPERIOR SOUTH CENTRAL 12800 13100 12200 11210. WAVES 1 FOOT OR
LESS.
SUPERIOR EAST 11600 11800 14100 12200. 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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