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FZUS63 KMQT 032043
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
443 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 30.4 inch high over the Mid-Atlantic Coast and a 30.1 inch high
crossing northern Ontario today maintain 30.0 to 30.1 inch ridging
over Lake Superior through this evening. Meanwhile, troughing over
the Plains has deepened to 29.6 inches this afternoon, and will
become centered over the Dakotas tonight. This lifts 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.


LSZ162-040445-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
443 PM EDT Fri Oct 3 2025 /343 PM CDT Fri Oct 3 2025/

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

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Areas of dense fog. Waves building to 1 to
3 feet, then 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 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West gales to 35 knots becoming northwest 15 to
25 knots after 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.

$$

LSZ263-040445-
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-
443 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...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy dense
fog. Waves calm to 2 feet.
.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 6 feet occasionally to
8 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. Waves subsiding to 3 to 5 feet
occasionally to 7 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.

$$

LSZ264-040445-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
443 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...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Areas of dense
fog. Waves calm to 2 feet.
.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 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 5 feet occasionally to
7 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. 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.

$$

LSZ265-040445-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
443 PM EDT Fri Oct 3 2025

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

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots late. A slight chance of showers through midnight. 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.

$$

LSZ266-040445-
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-
443 PM EDT Fri Oct 3 2025

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

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Areas of dense
fog. Waves 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 chance of showers. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 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.

$$

LSZ267-040445-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
443 PM EDT Fri Oct 3 2025

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.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. 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.

$$

LSZ261-040445-
MAFOR 0321 AMD/
Superior West 11110 19114 11210 11210 19214 11310 11410 13420.
Waves 2 feet or less tonight. Waves 1 to 3 feet Saturday.

Superior North Central 11200 19204 12314 11324 11424 13420. Waves
1 to 3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet
Saturday.

Superior South Central 11200 12300 11310 11410 12420 11430. Waves
1 foot or less tonight. Waves 1 to 3 feet Saturday.

Superior East 11100 11200 11300 12310 12420 11430. Waves 2 feet
or less tonight. Waves 1 to 3 feet building to 2 to 4 feet
Saturday.

$$

NJL

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes