263
FZUS63 KMQT 010801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Tue Sep 1 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 29.7 inch low will slowly move east over Ontario through Wednesday
and weaken to 29.8 inches as it reaches James Bay. This will bring
broad 29.9 inch troughing over the Upper Great Lakes through
Wednesday. A 29.9 inch ridge will move into the area Wednesday night
and build to 30.0 inches through Friday. Ridging will give way to
another weak trough on Saturday night with ridging of 30.1 inches
building back in for Sunday.



LSZ162-012000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Tue Sep 1 2026 /300 AM CDT Tue Sep 1 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS
MORNING...

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Areas of
dense fog. Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. Areas of dense
fog through early afternoon. Waves building to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds less than 10 knots becoming
northeast 5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-012000-
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-
400 AM EDT Tue Sep 1 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Areas of
dense fog. Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. Areas of dense
fog through early afternoon. Waves building to 2 to 4 feet.
.TONIGHT...West 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
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming southeast
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of thunderstorms. Waves calm to
2 feet.
.FRIDAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ264-012000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Tue Sep 1 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Widespread
dense fog. Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of dense fog through early afternoon. Waves
building to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming southwest 5 to 15 knots
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds less than 10 knots veering
northwest after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ265-012000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Tue Sep 1 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Widespread
dense fog. Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots veering west late. Areas of
dense fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then veering northeast late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering south. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-012000-
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-
400 AM EDT Tue Sep 1 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Widespread
dense fog. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. Widespread dense fog through
early afternoon. Waves building to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering south. Waves calm
to 2 feet.

$$

LSZ267-012000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Tue Sep 1 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.EARLY THIS MORNING...West winds 5 to 15 knots. Widespread dense
fog. Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing southeast late.
Widespread dense fog through early afternoon. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ261-011400-
MAFOR 0109/
Superior West 11504 11514 12520 12620 11710 11600. Waves 1 to 3
feet.

Superior North Central 11504 11514 11524 12530 11620 11610 11600.
Waves 1 to 3 feet.

Superior South Central 11504 11414 12410 12620 12610. Waves 2
feet or less.

Superior East 11604 11504 11404 11300 11400 11500 12600. 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