430
FZUS63 KMQT 110201
GLFLS

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

30.0 inch low pressure is moving east-southeast towards Georgian Bay
tonight while 30.2 inch ridging builds over Lake Superior. This
ridge gradually weakens through the weekend as the next system
organizes upstream in the Northern Plains. By early Monday, a
weakening 29.4 inch low pressure moves from Manitoba into far
northern Ontario, causing a 29.8 to 29.9 inch trough to move over
Lake Superior Sunday and Monday before ridging returns late Monday
into Tuesday, building to 30.4 inches by Tuesday morning. The ridge
remains in place through midweek while slowly weakening.


LSZ162-110800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Fri Oct 10 2025 /901 PM CDT Fri Oct 10 2025/

.REST OF TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northeast late. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then becoming east 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight, then veering south late. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. Showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. A chance of showers through early afternoon.
Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming west 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-110800-
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 10 2025

.REST OF TONIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots. A chance of showers
through midnight, then showers likely after midnight. Waves 4 to
7 feet occasionally to 9 feet.
.MONDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ264-110800-
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 10 2025

.REST OF TONIGHT...North winds 15 to 25 knots becoming northeast
5 to 15 knots late. Waves 5 to 8 feet occasionally to 10 feet
subsiding to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast 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. A slight chance of
showers through midnight, then showers likely after midnight.
Waves building to 6 to 10 feet occasionally to 13 feet.
.MONDAY...South winds 20 to 30 knots veering west by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ265-110800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Fri Oct 10 2025

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
10 to 20 knots. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast 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. A chance of showers
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Showers likely through early afternoon, then a
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to
1 to 3 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-110800-
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 10 2025

.REST OF TONIGHT...North winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 10 to 20 knots. Waves
7 to 10 feet occasionally to 13 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 20 to 30 knots becoming southeast 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. A chance of showers
after midnight. Waves building to 6 to 10 feet occasionally to
13 feet.
.MONDAY...South winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Showers likely. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves 1 to 3 feet.

$$

LSZ267-110800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Fri Oct 10 2025

.REST OF TONIGHT...North winds 20 to 30 knots becoming northeast
15 to 25 knots late. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northeast winds 15 to 25 knots becoming east 5 to
15 knots in the afternoon, then backing northeast late. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots increasing to
15 to 25 knots. Waves building to 2 to 4 feet.
.SUNDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. A slight chance of showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves subsiding
to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 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. Waves 1 to 3 feet.

$$

LSZ261-110800-
MAFOR 1103/
Superior West 11810 11110 11100 11200 12300 11210 11220. Waves 1
to 2 feet.

Superior North Central 11830 11820 11110 11210 11200 12310 11320.
Waves 4 to 7 feet subsiding to 3 to 5 feet overnight. Waves 2 to
4 feet subsiding to 1 to 2 feet Saturday. Waves 1 to 3 feet
Saturday evening.

Superior South Central 11840 11830 11820 11110 11200 12210 11320.
Waves 6 to 9 feet subsiding to 4 to 7 feet overnight. Waves 3 to
6 feet subsiding to 2 to 3 feet Saturday. Waves 1 to 2 feet
Saturday evening.

Superior East 11840 11830 12120 11210 12200 11210. Waves 5 to 8
feet overnight. Waves 3 to 5 feet subsiding to 1 to 2 feet
Saturday. Waves around 1 foot Saturday evening.

$$

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