346
FZUS63 KMQT 180802
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 AM EDT MON MAY 18 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
LOW PRESSURE WILL WEAKEN OVER THE LAKE TODAY WITH ANOTHER LOW
PRESSURE FOLLOWING IT, REACHING LAKE SUPERIOR BY TUESDAY MORNING AT
29.6 INCHES. AFTERWARDS, A 30.2 INCH HIGH OVER THE NORTHERN PLAINS
BUILDS TO 30.4 INCHES TUESDAY NIGHT INTO WEDNESDAY AS IT TRAVERSES
EASTWARDS INTO THE UPPER GREAT LAKES. THE HIGH PRESSURE SHIFTS EAST
ON THURSDAY WHILE LEAVING LINGERING RIDGING OF AT LEAST 30.1 INCHES
OVER LAKE SUPERIOR INTO FRIDAY.
LSZ162-182000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 AM EDT MON MAY 18 2026 /301 AM CDT MON MAY 18 2026/
EARLY THIS MORNING
NORTHEAST WINDS 10 TO 20 KNOTS. PATCHY FOG.
RAIN SHOWERS LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES
3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TODAY
NORTHEAST WINDS 5 TO 15 KNOTS. PATCHY FOG. A SLIGHT
CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 1 TO 3 FEET.
TONIGHT
NORTHEAST WINDS 15 TO 25 KNOTS. PATCHY FOG. A CHANCE
OF RAIN SHOWERS THROUGH MIDNIGHT. A SLIGHT CHANCE OF
THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
TUESDAY
NORTH WINDS 10 TO 20 KNOTS BACKING WEST IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES SUBSIDING TO 1 TO 3 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING
TO CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID
AFTERNOON. WAVES CALM TO 2 FEET.
WEDNESDAY NIGHT
SOUTHEAST WINDS 5 TO 15 KNOTS VEERING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTHEAST. WAVES
BUILDING TO 1 TO 3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
LSZ263-182000-
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-
401 AM EDT MON MAY 18 2026
EARLY THIS MORNING
EAST WINDS 10 TO 20 KNOTS. PATCHY FOG. RAIN
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
TODAY
NORTH WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS
IN THE AFTERNOON, THEN BECOMING NORTHEAST 10 TO 20 KNOTS LATE.
PATCHY FOG. A SLIGHT CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO
1 TO 3 FEET.
TONIGHT
NORTHEAST WINDS 15 TO 25 KNOTS. PATCHY FOG. A CHANCE
OF RAIN SHOWERS THROUGH MIDNIGHT. A SLIGHT CHANCE OF
THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
5 TO 8 FEET OCCASIONALLY TO 10 FEET.
TUESDAY
NORTH WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO
20 KNOTS IN THE AFTERNOON. A CHANCE OF RAIN SHOWERS THROUGH EARLY
AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO
5 TO 15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY
NORTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY
MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.
WEDNESDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO
CALM TO 2 FEET.
THURSDAY
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. WAVES BUILDING TO 1 TO 3 FEET.
FRIDAY
EAST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO
2 FEET, THEN BUILDING TO 1 TO 3 FEET.
LSZ264-182000-
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-
401 AM EDT MON MAY 18 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON
EARLY THIS MORNING
EAST WINDS 15 TO 25 KNOTS. PATCHY DENSE
FOG. RAIN SHOWERS AND A CHANCE OF THUNDERSTORMS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
TODAY
EAST WINDS 5 TO 15 KNOTS BACKING NORTH IN THE AFTERNOON,
THEN INCREASING TO 10 TO 20 KNOTS LATE. PATCHY DENSE FOG. A
CHANCE OF RAIN SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
TONIGHT
NORTHEAST WINDS 15 TO 25 KNOTS. PATCHY FOG. A CHANCE
OF RAIN SHOWERS THROUGH MIDNIGHT. A SLIGHT CHANCE OF
THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
TUESDAY
NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST IN THE
AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON. RAIN SHOWERS
LIKELY THROUGH EARLY AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET, THEN SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET.
WEDNESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTHWEST
5 TO 15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO
2 FEET.
WEDNESDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH
AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO
3 FEET.
FRIDAY
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES 1 TO 3 FEET.
LSZ265-182000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 AM EDT MON MAY 18 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON
EARLY THIS MORNING
SOUTHEAST WINDS 10 TO 20 KNOTS. PATCHY
DENSE FOG. RAIN SHOWERS AND A CHANCE OF THUNDERSTORMS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
TODAY
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING WEST IN THE
AFTERNOON, THEN VEERING NORTH LATE. PATCHY DENSE FOG. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.
TONIGHT
NORTH WINDS 10 TO 20 KNOTS VEERING EAST LATE. AREAS OF
DENSE FOG THROUGH MIDNIGHT. PATCHY FOG AFTER MIDNIGHT. A CHANCE
OF RAIN SHOWERS THROUGH MIDNIGHT. A SLIGHT CHANCE OF
THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
2 TO 4 FEET.
TUESDAY
NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO
30 KNOTS IN THE AFTERNOON. PATCHY FOG THROUGH EARLY AFTERNOON.
RAIN SHOWERS LIKELY AND A SLIGHT CHANCE OF THUNDERSTORMS THROUGH
EARLY AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO
9 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
WEDNESDAY
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING SOUTH 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO 2 FEET.
WEDNESDAY NIGHT
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.
THURSDAY
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH. WAVES
BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
FRIDAY
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 2 TO
4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
LSZ266-182000-
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-
401 AM EDT MON MAY 18 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON
EARLY THIS MORNING
SOUTHEAST WINDS 15 TO 25 KNOTS. AREAS OF
DENSE FOG. RAIN SHOWERS AND A CHANCE OF THUNDERSTORMS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
TODAY
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST IN THE
AFTERNOON, THEN VEERING NORTH LATE. AREAS OF DENSE FOG. A SLIGHT
CHANCE OF THUNDERSTORMS THROUGH EARLY AFTERNOON. A CHANCE OF
SHOWERS. WAVES SUBSIDING TO 2 TO 4 FEET.
TONIGHT
NORTHEAST WINDS 15 TO 25 KNOTS VEERING EAST AFTER
MIDNIGHT. AREAS OF DENSE FOG. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. A CHANCE OF THUNDERSTORMS. RAIN SHOWERS LIKELY AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TUESDAY
SOUTH WINDS 15 TO 25 KNOTS BECOMING NORTHWEST 20 TO
30 KNOTS IN THE AFTERNOON, THEN INCREASING TO 30 KNOTS WITH A FEW
GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. AREAS OF DENSE FOG
THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF THUNDERSTORMS THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 7 TO
10 FEET OCCASIONALLY TO 13 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING
TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
WEDNESDAY
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 5 TO
15 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 1 TO 3 FEET.
WEDNESDAY NIGHT
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 2 TO
4 FEET, THEN SUBSIDING TO 1 TO 3 FEET.
FRIDAY
SOUTHEAST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO
20 KNOTS. WAVES 1 TO 3 FEET.
LSZ267-182000-
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF
SHORE TO THE US/CANADIAN BORDER-
401 AM EDT MON MAY 18 2026
..DENSE FOG ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
EARLY THIS MORNING
SOUTHEAST WINDS 20 TO 30 KNOTS. PATCHY FOG.
RAIN SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES 3 TO
6 FEET OCCASIONALLY TO 8 FEET.
TODAY
SOUTHEAST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST 10 TO
20 KNOTS IN THE AFTERNOON, THEN BECOMING NORTH 5 TO 15 KNOTS
LATE. AREAS OF DENSE FOG. A SLIGHT CHANCE OF THUNDERSTORMS
THROUGH EARLY AFTERNOON. A CHANCE OF SHOWERS. WAVES SUBSIDING TO
CALM TO 2 FEET.
TONIGHT
EAST WINDS 5 TO 15 KNOTS BECOMING SOUTHEAST 10 TO
20 KNOTS LATE. AREAS OF DENSE FOG. A CHANCE OF SHOWERS AND
THUNDERSTORMS. WAVES BUILDING TO 2 TO 4 FEET.
TUESDAY
SOUTH WINDS 15 TO 25 KNOTS BECOMING WEST 20 TO
30 KNOTS IN THE AFTERNOON, THEN INCREASING TO 30 KNOTS WITH A FEW
GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. AREAS OF DENSE FOG
THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF THUNDERSTORMS THROUGH
EARLY AFTERNOON. A CHANCE OF RAIN SHOWERS. WAVES BUILDING TO 7 TO
10 FEET OCCASIONALLY TO 13 FEET.
TUESDAY NIGHT
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO
30 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
WEDNESDAY
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO
20 KNOTS BY MID AFTERNOON. WAVES SUBSIDING TO 2 TO 4 FEET.
WEDNESDAY NIGHT
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH AFTER
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
EAST WINDS 5 TO 15 KNOTS VEERING SOUTHEAST. WAVES
CALM TO 2 FEET.
FRIDAY
SOUTHEAST WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN SUBSIDING TO CALM TO 2 FEET.
LSZ261-181400-
MAFOR 1809/
SUPERIOR WEST 11126 11120 12110 11120 11130 11136 11146. WAVES 3
TO 6 FEET SUBSIDING TO 2 TO 3 FEET TODAY. WAVES 2 TO 3 FEET
BUILDING TO 5 TO 7 FEET TONIGHT.
SUPERIOR NORTH CENTRAL 11336 19334 11324 12810 19814 11820 12130
11136. A CHANCE OF THUNDERSTORMS THIS MORNING. WAVES 3 TO 6 FEET.
SUPERIOR SOUTH CENTRAL 11326 19324 11320 19324 11420 19424 11710
19714 11820 11810 11114 11216. A CHANCE OF THUNDERSTORMS THIS
MORNING. WAVES 3 TO 6 FEET SUBSIDING TO 2 TO 4 FEET TODAY. WAVES
1 TO 3 FEET TONIGHT.
SUPERIOR EAST 12336 19334 11424 11614 11804 11104 11224 11234.
WAVES 3 TO 6 FEET SUBSIDING TO 2 TO 4 FEET TODAY. WAVES 1 TO 2
FEET BUILDING TO 3 TO 5 FEET TONIGHT.
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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