926
FZUS63 KMQT 100201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Tue Sep 9 2025

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...

29.9 inch troughing over Lake Superior lingers this evening before
ridging returns on Wednesday as a 30.3 inch high pressure builds
over far northern Ontario. 30.2 inch ridging persists over Lake
Superior through Friday as the high shifts east to New England. On
Friday, a 29.7 inch low will organize over the Northern Plains, then
lift north into Canada by Sunday morning. During this period, weak
30.0 inch troughing may move over the lake Saturday, before ridging
of at least 30.1 inches returns to the Upper Great Lakes Sunday.


LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue Sep 9 2025 /901 PM CDT Tue Sep 9 2025/

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

.REST OF TONIGHT...Northeast winds 5 to 15 knots. A slight chance
of showers by midnight. Patchy dense fog by midnight, then areas
of fog after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Patchy fog through early afternoon.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-100800-
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-
1001 PM EDT Tue Sep 9 2025

.REST OF TONIGHT...North winds less than 10 knots becoming
northeast 5 to 15 knots late. Patchy fog. A slight chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Patchy fog through
early afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. 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 veering south after
midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ264-100800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Tue Sep 9 2025

.REST OF TONIGHT...North winds less than 10 knots veering
northeast after midnight, then increasing to 5 to 15 knots late.
Patchy fog. A slight chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Patchy fog through
early afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots becoming east
less than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue Sep 9 2025

.REST OF TONIGHT...South winds 5 to 15 knots backing northeast
late. Patchy fog. Showers likely by midnight. A chance of showers
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Patchy fog through
early afternoon. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots veering east
late. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-100800-
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-
1001 PM EDT Tue Sep 9 2025

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
late. Patchy fog. Showers likely and a slight chance of
thunderstorms by midnight. A chance of showers after midnight.
Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots. Patchy fog through
early afternoon. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. 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 veering south after
midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue Sep 9 2025

.REST OF TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of thunderstorms by midnight.
Showers likely. Patchy fog after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing northeast in the
afternoon. Patchy fog through early afternoon. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ261-100800-
MAFOR 1003/
Superior West 11104 12100 14110 11110. Waves 2 feet or less.

Superior North Central 11800 12100 13110 12100. A chance of
showers late this evening. Waves 2 feet or less.

Superior South Central 11406 11400 11500 11800 14100. Waves 1
foot or less.

Superior East 11416 11410 11500 11400 14100. 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