318
FZUS63 KMQT 220316
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
1116 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
30.3 INCH HIGH PRESSURE BECOMES CENTERED OVER NORTHERN ONTARIO AND
THE UPPER GREAT LAKES TONIGHT INTO THURSDAY MORNING. BY FRIDAY
AFTERNOON, THE HIGH BUILDS TO 30.5 INCHES OVER THE SOUTHERN
ONTARIO/QUEBEC LINE AS A 29.4 INCH LOW MOVES INTO EASTERN MONTANA.
BY SATURDAY AFTERNOON, THE HIGH CONTINUES INTO NEW ENGLAND AS THE
LOW LIFTS NORTH OF LAKE WINNIPEG INTO NORTHERN MANITOBA,
STRENGTHENING TO 29.2 INCHES BY SATURDAY EVENING. THE LOW THEN LIFTS
NORTHEAST TO HUDSON BAY SATURDAY NIGHT THROUGH SUNDAY AS IT DRAGS A
30.2 INCH TROUGH ACROSS LAKE SUPERIOR. 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.
LSZ162-221130-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
1116 PM EDT WED OCT 21 2026 /1016 PM CDT WED OCT 21 2026/
REST OF TONIGHT
NORTHEAST WINDS 5 TO 15 KNOTS DIMINISHING TO
LESS THAN 10 KNOTS LATE. PATCHY FOG AFTER MIDNIGHT. WAVES CALM TO
2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS. PATCHY FOG THROUGH EARLY
AFTERNOON. 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. A SLIGHT CHANCE OF SHOWERS 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 CALM TO 2 FEET.
SUNDAY
WEST WINDS 5 TO 15 KNOTS VEERING NORTH. WAVES CALM TO
2 FEET.
MONDAY
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.
LSZ263-221130-
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-
1116 PM EDT WED OCT 21 2026
REST OF TONIGHT
EAST WINDS LESS THAN 10 KNOTS BACKING
NORTHEAST AFTER MIDNIGHT. PATCHY FOG 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 THROUGH EARLY AFTERNOON.
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
6 FEET OCCASIONALLY TO 8 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, THEN BUILDING TO 1 TO 3 FEET.
MONDAY
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM
TO 2 FEET.
LSZ264-221130-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
1116 PM EDT WED OCT 21 2026
REST OF TONIGHT
NORTHEAST WINDS LESS THAN 10 KNOTS. PATCHY FOG
AFTER MIDNIGHT. 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. PATCHY FOG
THROUGH EARLY AFTERNOON. 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.
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 CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
MONDAY
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ265-221130-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
1116 PM EDT WED OCT 21 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM EDT THURSDAY
REST OF TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. AREAS OF FOG. 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. 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
SUBSIDING TO CALM TO 2 FEET, THEN BUILDING TO 1 TO 3 FEET.
MONDAY
NORTH WINDS 15 TO 25 KNOTS BECOMING NORTHEAST 10 TO
20 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
LSZ266-221130-
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-
1116 PM EDT WED OCT 21 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 4 AM EDT THURSDAY
REST OF TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. PATCHY FOG BY MIDNIGHT, THEN AREAS OF DENSE FOG
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS. 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, THEN INCREASING TO 15 TO 25 KNOTS
LATE. 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 1 TO 3 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ267-221130-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
1116 PM EDT WED OCT 21 2026
REST OF TONIGHT
NORTH WINDS 5 TO 15 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. PATCHY FOG. 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 1 TO 3 FEET,
THEN BUILDING TO 2 TO 4 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST. WAVES
SUBSIDING TO CALM TO 2 FEET.
LSZ261-221130-
MAFOR 2203 AMD/
SUPERIOR WEST 11200 11100 14200 11200 11100. WAVES 1 FOOT OR
LESS.
SUPERIOR NORTH CENTRAL 12100 12200 19204 11300 19304 12300 11310.
WAVES 1 FOOT OR LESS.
SUPERIOR SOUTH CENTRAL 12100 19104 11104 11204 11200 19204 11210
12310. WAVES 1 FOOT OR LESS.
SUPERIOR EAST 11800 19804 13100 19104 13200 11300. WAVES 1 FOOT
OR LESS.
77
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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