071
FZUS63 KMQT 101401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Wed Sep 10 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...

30.2 to 30.3 inch ridging persists over Lake Superior through Friday
as the 30.3 inch high pressure over northern Ontario shifts east to
New England. 30.0 inch troughing will extend over the western half
of the lake on Saturday from a 29.7 inch low over the northern
Plains. 30.1 inch ridging returns on Sunday as a 30.2 inch high
builds over James Bay.


LSZ162-102000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed Sep 10 2025 /901 AM CDT Wed Sep 10 2025/

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

.REST OF TODAY...Northeast winds 10 to 20 knots becoming east
5 to 15 knots late. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Areas of dense fog.
Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. Areas of dense fog
through early 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 backing northeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. 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.

$$

LSZ263-102000-
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 AM EDT Wed Sep 10 2025

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

.REST OF TODAY...Northeast winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then increasing to 5 to 15 knots late.
Areas of dense fog. Waves calm to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing northeast late. Areas of
dense fog through early afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ264-102000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Wed Sep 10 2025

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

.REST OF TODAY...Northeast winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots diminishing to less than
10 knots after midnight. Patchy fog through midnight, then areas
of dense fog after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Areas of dense fog through
early 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 backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots becoming east less
than 10 knots 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.

$$

LSZ265-102000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Wed Sep 10 2025

.REST OF TODAY...Northeast winds 5 to 15 knots increasing to
10 to 20 knots late. A slight chance of showers by late morning.
Patchy fog. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog through
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots. Areas of dense fog through
early afternoon. 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 east 10 to 20 knots
by mid afternoon. A slight chance of showers 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.

$$

LSZ266-102000-
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 AM EDT Wed Sep 10 2025

.REST OF TODAY...Northeast winds 5 to 15 knots. A slight chance
of showers by late morning. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog through
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots. Patchy dense fog through
early afternoon. 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 backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots 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.

$$

LSZ267-102000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Wed Sep 10 2025

.REST OF TODAY...Southeast winds 5 to 15 knots backing northeast
late. A chance of showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering east late. Patchy fog after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast late.
Patchy fog through early 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...East winds 10 to 20 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ261-102000-
MAFOR 1015/
Superior West 13110 11100 14104. Waves 1 to 2 feet.

Superior North Central 11114 11110 12100 13104 11204. Waves 2
feet or less.

Superior South Central 13110 12100 12104 11204. A chance of
showers late this morning. Waves 2 feet or less.

Superior East 12200 13100 11110 12210. A chance of showers late
this morning. 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