973
FZUS63 KMQT 090201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Tue Sep 8 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 29.4 inch low continues its northeastward track toward northern
Quebec, deepening to 29.1 inches by the time it reaches Hudson Bay
tomorrow afternoon. In the wake of frontal passage southerly winds
will become westerly tonight. Strong postfrontal westerlies then
persist until Thursday morning; widespread gale-force winds are
anticipated. Ridging to 30.0 inches and subsequent calmer conditions
follow until Friday morning, when a trough of 29.3 inches tracks
from the Great Plains north toward Hudson Bay. Friday through
Saturday morning, a tight pressure gradient between 29.6 and 29.9
inches sits over Lake Superior as the Plains shifts rapidly north,
tracking through Minnesota. Expect breezy southerly flow Friday
afternoon through Saturday morning as a result of this low`s
passage, and strong westerlies throughout the day on Saturday.
Ridging begins to build back in Saturday, reaching 29.9 inches by
Sunday morning.



LSZ162-090800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue Sep 8 2026 /901 PM CDT Tue Sep 8 2026/

...GALE WATCH IN EFFECT FROM 8 AM EDT /7 AM CDT/ WEDNESDAY
THROUGH WEDNESDAY AFTERNOON...

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

$$

LSZ263-090800-
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 8 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...Southwest winds 20 to 30 knots veering west
late. Waves 3 to 5 feet occasionally to 7 feet building to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 15 to
25 knots after midnight, then becoming northwest 10 to 20 knots
late. Waves subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South gales to 40 knots. A chance of showers by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers and a chance of thunderstorms. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West gales to 35 knots. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-090800-
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 8 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...South winds 20 to 30 knots veering west late.
Waves 3 to 5 feet occasionally to 7 feet building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 7 to
11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...West gales to 35 knots becoming northwest
20 to 30 knots after midnight, then diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest by
mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West gales to 35 knots. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-090800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue Sep 8 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...South winds 20 to 30 knots veering west late.
Waves 2 to 4 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 5 to
9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...West gales to 35 knots becoming northwest
20 to 30 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 20 to 30 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...South gales to 35 knots. A chance of showers
through midnight, then showers after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...West gales to 40 knots diminishing to 20 to 30 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-090800-
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 8 2026

...GALE WARNING IN EFFECT FROM 8 AM EDT WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...South gales to 35 knots diminishing to 20 to
30 knots after midnight, then veering southwest late. A slight
chance of showers and thunderstorms by midnight. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 7 to
11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
15 to 25 knots. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...South gales to 40 knots. A chance of showers
through midnight, then showers likely after midnight. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West gales to 40 knots diminishing to 20 to 30 knots.
A chance of showers. Waves subsiding to 3 to 6 feet occasionally
to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-090800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue Sep 8 2026

...GALE WARNING IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH LATE
WEDNESDAY NIGHT...

.REST OF TONIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots late. A chance of showers and thunderstorms. Waves
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots increasing to gales to
40 knots in the afternoon. Waves subsiding to 2 to 4 feet, then
building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...West gales to 35 knots veering northwest after
midnight, then diminishing to 20 to 30 knots late. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots. Showers likely. Waves 3 to
6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-090800-
MAFOR 0903/
Superior West...GALE WARNING IN EFFECT...11540 13640 12650 11640
11630. Waves 2 to 4 feet building to 3 to 5 feet overnight. Waves
3 to 6 feet building to 4 to 7 feet Wednesday. Waves 3 to 5 feet
subsiding to 2 to 4 feet Wednesday evening.

Superior North Central...GALE WARNING IN EFFECT...12540 11640
11650 13660 11750. Waves 3 to 6 feet overnight. Waves 5 to 9 feet
building to 7 to 11 feet Wednesday. Waves 7 to 10 feet subsiding
to 5 to 8 feet Wednesday evening.

Superior South Central...GALE WARNING IN EFFECT...11440 11530
11640 12650 11660 12650. Waves 3 to 5 feet subsiding to 2 to 4
feet overnight. Waves 2 to 4 feet building to 6 to 9 feet
Wednesday. Waves 5 to 9 feet Wednesday evening.

Superior East...GALE WARNING IN EFFECT...11440 11540 11530 11630
12640 12650. A chance of showers overnight. Waves 4 to 7 feet
overnight. Waves 3 to 6 feet building to 7 to 10 feet Wednesday.
Waves 7 to 10 feet Wednesday evening.

$$

WFO MQT

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