349
FZUS63 KMQT 040201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Fri Oct 3 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...

A 29.6 inch low over the Dakotas will lift towards Lake Winnipeg
early Saturday while later in the day a 29.4 inch low develops off
of the Colorado Rockies. This second low then lifts northeast on
Sunday to northwestern Ontario, quickly reaching far northern Quebec
by Monday morning as it deepens to at least 29.2 inches. This
results in at least 29.8 inch troughing over Lake Superior by
Saturday, which holds until Monday morning. In its wake, a 30.3 inch
high pressure moving across the Northern Plains brings ridging of
30.1 inches back over Lake Superior by Monday. A reinforcing 30.3
inch high pressure dropping down from the Canadian Prairies into the
Northern Plains on Tuesday brings 30.2 inch ridging to Lake Superior
by Tuesday evening. The high then strengthens to around 30.4 inches
close to the lake Tuesday night into Wednesday.


LSZ162-040800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Oct 3 2025 /901 PM CDT Fri Oct 3 2025/

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Areas of dense fog. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...West gales to 35 knots becoming northwest 15 to
25 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ263-040800-
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 Fri Oct 3 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 AM EDT SATURDAY...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...East winds 5 to 15 knots veering southeast
after midnight, then becoming south 10 to 20 knots late. Areas of
dense fog. A slight chance of showers after midnight. Waves calm
to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
40 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West gales to 40 knots becoming northwest 20 to
30 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 4 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.

$$

LSZ264-040800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Fri Oct 3 2025

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 AM EDT SATURDAY...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Areas of dense fog. A slight chance of
showers after midnight. Waves calm to 2 feet building to 1 to
3 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...Southwest gales to 35 knots becoming west 20 to
30 knots after midnight. A slight chance of showers through
midnight. Waves building to 4 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 2 to 4 feet.

$$

LSZ265-040800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Oct 3 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Waves calm to 2 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves 1 to 3 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 20 to
30 knots after midnight. A chance of showers. Waves subsiding to
2 to 4 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering south. Waves calm
to 2 feet.

$$

LSZ266-040800-
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 Fri Oct 3 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Areas of dense fog. Waves calm to 2 feet
building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 20 to
30 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots veering south. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ267-040800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Oct 3 2025

.REST OF TONIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots late. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.SUNDAY NIGHT...South gales to 35 knots becoming west 20 to
30 knots after midnight. Showers likely and a slight chance of
thunderstorms. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ261-040800-
MAFOR 0403/
Superior West 11210 19214 11310 11410 13420 12430. Waves 1 to 3
feet overnight and Saturday. Waves 1 to 3 feet building to 2 to 4
feet Saturday evening.

Superior North Central 11314 11324 11424 13420 12430. Waves 1 to
3 feet overnight. Waves 1 to 3 feet building to 2 to 4 feet
Saturday. Waves 2 to 4 feet Saturday evening.

Superior South Central 11300 11310 11410 12420 13430. Waves 1 to
3 feet overnight and Saturday. Waves 2 to 4 feet Saturday
evening.

Superior East 11300 12310 12420 11430 12440. Waves 2 feet or less
overnight. Waves 1 to 3 feet building to 2 to 4 feet Saturday.
Waves 3 to 6 feet Saturday evening.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes