633
FZUS63 KMQT 082002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Wed Oct 8 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...

30.4 inch high pressure remains sprawled out over the Great Lakes
into Thursday. The high shifts east to New England by Thursday
evening at 30.5 inches, allowing 30.0 inch troughing to move into
the Upper Great Lakes as a 29.4 inch low moves over Hudson Bay.
Along this trough, a 29.9 inch low will develop, then move over Lake
Superior Friday afternoon and evening. The low continues into Lake
Michigan Friday night and Saturday while 30.1 inch ridging builds
over the lake. This ridge gradually weakens through the weekend as
the next system organizes upstream in the Northern Plains.


LSZ162-090800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Wed Oct 8 2025 /302 PM CDT Wed Oct 8 2025/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers, then showers likely. Waves 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots veering northwest. A
chance of showers. Waves subsiding to 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-
402 PM EDT Wed Oct 8 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing south late. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight, then diminishing to 15 to 25 knots
late. A chance of showers. Waves subsiding to 1 to 3 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves building
to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots becoming south 20 to
30 knots. Showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming northwest 5 to
15 knots. A chance of showers. 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-
402 PM EDT Wed Oct 8 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south late.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 20 to 30 knots veering south. A chance
of showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...South winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet.

$$

LSZ265-090800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Wed Oct 8 2025

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then becoming southwest 15 to 25 knots
late. A chance of showers after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Showers likely. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. 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-
402 PM EDT Wed Oct 8 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 10 to 20 knots late. Waves building to 1 to
3 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots by mid afternoon. Showers likely. Waves subsiding to
1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of showers. Waves subsiding to calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Waves building
to 2 to 4 feet.
.SUNDAY...Southeast winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...South winds 20 to 30 knots becoming southwest 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet.

$$

LSZ267-090800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Wed Oct 8 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of showers after midnight. Waves building
to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Showers likely. Waves subsiding to
2 to 4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers. Waves building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-090200-
MAFOR 0821/
Superior West 11400 11300 11310 11410 13520 11420. Waves 2 feet
or less tonight. Waves 1 to 3 feet Thursday.

Superior North Central 11610 11500 12410 11420 12520 11420. Waves
1 to 3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet
Thursday.

Superior South Central 11700 11200 11400 12410 11520 12420. Waves
2 feet or less tonight. Waves 1 to 3 feet Thursday.

Superior East 11700 11600 11500 11400 11410 13420. Waves 1 foot
or less tonight. Waves 1 to 3 feet building to 2 to 4 feet
Thursday.

$$

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