139
FZUS63 KMQT 170801
GLFLS
OPEN LAKE FORECAST FOR LAKE SUPERIOR
NATIONAL WEATHER SERVICE MARQUETTE MI
401 AM EDT SUN MAY 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
RIDGING OF 30.1 INCHES OVER LAKE SUPERIOR THIS MORNING WILL PUSH
EAST AS A 29.2 INCH LOW MOVES OUT OF COLORADO. THIS LOW WILL WEAKEN
TO 29.6 INCHES AS IT REACHES LAKE SUPERIOR LATE TONIGHT. ANOTHER LOW
PRESSURE WILL FOLLOW IT, REACHING LAKE SUPERIOR BY TUESDAY MORNING
AT 29.7 INCHES. THEREAFTER A 30.1 INCH HIGH WILL BUILD INTO THE
MIDWEST WEDNESDAY, STRENGTHENING TO 30.4 INCHES OVER LAKE SUPERIOR
WEDNESDAY NIGHT. THE HIGH PRESSURE WILL SHIFT EAST ON THURSDAY WITH
WEAKER RIDGING OF 30.1 INCHES OVER THE LAKE BY THURSDAY NIGHT.
LSZ162-172000-
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE MN BEYOND 5NM-
401 AM EDT SUN MAY 17 2026 /301 AM CDT SUN MAY 17 2026/
EARLY THIS MORNING
NORTHEAST WINDS 15 TO 25 KNOTS. WAVES CALM
TO 2 FEET BUILDING TO 2 TO 4 FEET.
TODAY
EAST WINDS 20 TO 30 KNOTS BECOMING NORTHEAST TO 30 KNOTS
WITH A FEW GALE FORCE GUSTS TO 35 KNOTS POSSIBLE IN THE
AFTERNOON. A CHANCE OF RAIN SHOWERS BY MID AFTERNOON. WAVES
BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
TONIGHT
NORTHEAST WINDS TO 30 KNOTS WITH A FEW GALE FORCE
GUSTS TO 35 KNOTS POSSIBLE DIMINISHING TO 15 TO 25 KNOTS. RAIN
SHOWERS THROUGH MIDNIGHT. A CHANCE OF THUNDERSTORMS. A CHANCE OF
RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET
OCCASIONALLY TO 14 FEET, THEN SUBSIDING TO 3 TO 6 FEET
OCCASIONALLY TO 8 FEET.
MONDAY
NORTHEAST WINDS 10 TO 20 KNOTS. A CHANCE OF RAIN
SHOWERS THROUGH EARLY AFTERNOON. A SLIGHT CHANCE OF
THUNDERSTORMS. RAIN SHOWERS LIKELY BY MID AFTERNOON. WAVES
SUBSIDING TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS
THROUGH MIDNIGHT. A SLIGHT CHANCE OF THUNDERSTORMS. RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO
14 FEET.
TUESDAY
NORTH GALES TO 35 KNOTS BECOMING NORTHWEST 10 TO
20 KNOTS BY MID AFTERNOON. RAIN SHOWERS LIKELY THROUGH EARLY
AFTERNOON. WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO
15 FEET, THEN SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING
TO CALM TO 2 FEET.
WEDNESDAY
SOUTHWEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.
THURSDAY
SOUTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 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-
401 AM EDT SUN MAY 17 2026
EARLY THIS MORNING
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES CALM
TO 2 FEET.
TODAY
EAST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 20 TO
30 KNOTS IN THE AFTERNOON, THEN INCREASING TO 30 KNOTS WITH A FEW
GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. A SLIGHT CHANCE OF
RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO 5 TO 8 FEET
OCCASIONALLY TO 10 FEET.
TONIGHT
EAST WINDS 20 TO 30 KNOTS DIMINISHING TO 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. A CHANCE OF THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT.
WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET, THEN
BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET.
MONDAY
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST LATE. A
CHANCE OF RAIN SHOWERS THROUGH EARLY AFTERNOON. A SLIGHT CHANCE
OF THUNDERSTORMS. RAIN SHOWERS LIKELY BY MID AFTERNOON. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS
THROUGH MIDNIGHT. A SLIGHT CHANCE OF THUNDERSTORMS. RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 8 TO 11 FEET OCCASIONALLY TO
14 FEET.
TUESDAY
NORTH GALES TO 35 KNOTS BECOMING NORTHWEST 15 TO
25 KNOTS BY MID AFTERNOON. RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES BUILDING TO 9 TO 12 FEET OCCASIONALLY TO 15 FEET, THEN
SUBSIDING TO 5 TO 8 FEET OCCASIONALLY TO 10 FEET.
TUESDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS BACKING NORTHWEST
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO
7 FEET.
WEDNESDAY
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES
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-
401 AM EDT SUN MAY 17 2026
EARLY THIS MORNING
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES 1 TO
3 FEET SUBSIDING TO CALM TO 2 FEET.
TODAY
EAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO 20 KNOTS IN
THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN SUBSIDING TO
1 TO 3 FEET.
TONIGHT
EAST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO 30 KNOTS
AFTER MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE. A CHANCE
OF RAIN SHOWERS THROUGH MIDNIGHT. A CHANCE OF THUNDERSTORMS. RAIN
SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET
OCCASIONALLY TO 9 FEET.
MONDAY
SOUTHEAST WINDS 10 TO 20 KNOTS BACKING NORTH IN THE
AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS LATE. A CHANCE OF
RAIN SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. WAVES
SUBSIDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.
MONDAY NIGHT
NORTHEAST WINDS 20 TO 30 KNOTS INCREASING TO
GALES TO 35 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS
THROUGH MIDNIGHT. A SLIGHT CHANCE OF THUNDERSTORMS. RAIN SHOWERS
AFTER MIDNIGHT. WAVES BUILDING TO 7 TO 10 FEET OCCASIONALLY TO
13 FEET.
TUESDAY
NORTH GALES TO 35 KNOTS. RAIN SHOWERS THROUGH EARLY
AFTERNOON. WAVES 7 TO 10 FEET OCCASIONALLY TO 13 FEET.
TUESDAY NIGHT
NORTH WINDS 15 TO 25 KNOTS BACKING NORTHWEST
AFTER MIDNIGHT. WAVES SUBSIDING TO 3 TO 6 FEET OCCASIONALLY TO
8 FEET.
WEDNESDAY
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES
CALM TO 2 FEET.
LSZ265-172000-
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI
BEYOND 5NM FROM SHORE-
401 AM EDT SUN MAY 17 2026
EARLY THIS MORNING
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES CALM
TO 2 FEET.
TODAY
EAST WINDS 10 TO 20 KNOTS INCREASING TO 15 TO 25 KNOTS
IN THE AFTERNOON, THEN DIMINISHING TO 10 TO 20 KNOTS LATE. A
SLIGHT CHANCE OF RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO
1 TO 3 FEET.
TONIGHT
EAST WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT, THEN DIMINISHING TO 15 TO 25 KNOTS LATE.
RAIN SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS. WAVES BUILDING
TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
MONDAY
SOUTH WINDS 10 TO 20 KNOTS BACKING NORTH IN THE
AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS LATE. SHOWERS AND A
CHANCE OF THUNDERSTORMS. WAVES SUBSIDING TO 1 TO 3 FEET.
MONDAY NIGHT
NORTH WINDS 10 TO 20 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. A
CHANCE OF THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES
BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TUESDAY
NORTHWEST WINDS 20 TO 30 KNOTS INCREASING TO GALES TO
35 KNOTS BY MID AFTERNOON. RAIN SHOWERS THROUGH EARLY AFTERNOON.
WAVES BUILDING TO 7 TO 11 FEET OCCASIONALLY TO 14 FEET.
TUESDAY NIGHT
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING
TO 6 TO 9 FEET OCCASIONALLY TO 11 FEET.
WEDNESDAY
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING SOUTHWEST
5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTHEAST WINDS 10 TO 20 KNOTS VEERING SOUTH. WAVES
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-
401 AM EDT SUN MAY 17 2026
EARLY THIS MORNING
NORTHEAST WINDS 10 TO 20 KNOTS. WAVES 1 TO
3 FEET.
TODAY
NORTHEAST WINDS 10 TO 20 KNOTS VEERING EAST IN THE
AFTERNOON, THEN BACKING NORTHEAST LATE. A SLIGHT CHANCE OF RAIN
SHOWERS BY MID AFTERNOON. WAVES 1 TO 3 FEET.
TONIGHT
EAST WINDS 20 TO 30 KNOTS VEERING SOUTHEAST AFTER
MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. A CHANCE OF
THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT. WAVES BUILDING TO
4 TO 7 FEET OCCASIONALLY TO 9 FEET.
MONDAY
SOUTH WINDS 15 TO 25 KNOTS BACKING NORTH LATE. A CHANCE
OF SHOWERS THROUGH EARLY AFTERNOON. A CHANCE OF THUNDERSTORMS.
SHOWERS BY MID AFTERNOON. WAVES SUBSIDING TO 3 TO 5 FEET
OCCASIONALLY TO 7 FEET.
MONDAY NIGHT
NORTH WINDS 20 TO 30 KNOTS VEERING NORTHEAST
AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH MIDNIGHT. A
SLIGHT CHANCE OF THUNDERSTORMS. RAIN SHOWERS AFTER MIDNIGHT.
WAVES BUILDING TO 4 TO 8 FEET OCCASIONALLY TO 10 FEET.
TUESDAY
NORTH GALES TO 35 KNOTS BACKING NORTHWEST BY MID
AFTERNOON. RAIN SHOWERS THROUGH EARLY AFTERNOON. WAVES BUILDING
TO 8 TO 11 FEET OCCASIONALLY TO 14 FEET.
TUESDAY NIGHT
NORTHWEST GALES TO 35 KNOTS. WAVES SUBSIDING TO
7 TO 10 FEET OCCASIONALLY TO 13 FEET.
WEDNESDAY
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING SOUTHWEST
5 TO 15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTH WINDS 10 TO 20 KNOTS. WAVES BUILDING TO 1 TO
3 FEET, THEN 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-
401 AM EDT SUN MAY 17 2026
EARLY THIS MORNING
NORTHEAST WINDS 5 TO 15 KNOTS. WAVES 1 TO
3 FEET.
TODAY
NORTHEAST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO
20 KNOTS LATE. WAVES SUBSIDING TO CALM TO 2 FEET.
TONIGHT
EAST WINDS 15 TO 25 KNOTS BECOMING SOUTHEAST 20 TO
30 KNOTS AFTER MIDNIGHT, THEN INCREASING TO 30 KNOTS WITH A FEW
GALE FORCE GUSTS TO 35 KNOTS POSSIBLE LATE. A CHANCE OF RAIN
SHOWERS THROUGH MIDNIGHT. A CHANCE OF THUNDERSTORMS. RAIN SHOWERS
LIKELY AFTER MIDNIGHT. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY
TO 9 FEET.
MONDAY
SOUTH WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO
20 KNOTS. A CHANCE OF SHOWERS THROUGH EARLY AFTERNOON. A CHANCE
OF THUNDERSTORMS. SHOWERS BY MID AFTERNOON. WAVES SUBSIDING TO
CALM TO 2 FEET.
MONDAY NIGHT
WEST WINDS 10 TO 20 KNOTS BECOMING EAST 15 TO
25 KNOTS AFTER MIDNIGHT. A CHANCE OF RAIN SHOWERS THROUGH
MIDNIGHT. A SLIGHT CHANCE OF THUNDERSTORMS. RAIN SHOWERS AFTER
MIDNIGHT. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET.
TUESDAY
SOUTH WINDS 20 TO 30 KNOTS BECOMING WEST GALES TO
35 KNOTS BY MID AFTERNOON. RAIN SHOWERS THROUGH EARLY AFTERNOON,
THEN A CHANCE OF RAIN SHOWERS BY MID AFTERNOON. WAVES BUILDING TO
7 TO 10 FEET OCCASIONALLY TO 13 FEET.
TUESDAY NIGHT
NORTHWEST GALES TO 35 KNOTS. WAVES 7 TO 10 FEET
OCCASIONALLY TO 13 FEET.
WEDNESDAY
NORTHWEST WINDS 20 TO 30 KNOTS BECOMING WEST 5 TO
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.
THURSDAY
SOUTHWEST WINDS 5 TO 15 KNOTS BACKING SOUTH. WAVES
CALM TO 2 FEET.
LSZ261-171400-
MAFOR 1709/
SUPERIOR WEST 11120 11220 11140 12150 11256 11246 11146. A CHANCE
OF THUNDERSTORMS TONIGHT. WAVES 1 TO 3 FEET BUILDING TO 6 TO 9
FEET TODAY. WAVES 6 TO 10 FEET SUBSIDING TO 5 TO 8 FEET TONIGHT.
SUPERIOR NORTH CENTRAL 12120 12220 11120 11230 12246. A CHANCE OF
THUNDERSTORMS TONIGHT. WAVES 1 TO 3 FEET TODAY. WAVES 1 TO 3 FEET
BUILDING TO 5 TO 7 FEET TONIGHT.
SUPERIOR SOUTH CENTRAL 11120 11110 13220 11230 12346. A CHANCE OF
THUNDERSTORMS TONIGHT. WAVES 1 TO 3 FEET TODAY. WAVES 2 TO 4 FEET
BUILDING TO 3 TO 6 FEET TONIGHT.
SUPERIOR EAST 13120 11110 11120 11230 12346. A CHANCE OF
THUNDERSTORMS TONIGHT. WAVES 1 TO 3 FEET TODAY. WAVES 1 TO 2 FEET
BUILDING TO 5 TO 7 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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