630
FZUS63 KMQT 250800
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sun Oct 25 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...

High pressure builds to 30.6 inches over the Canadian Prairies
today, pushing ridging of 30.4 inches over Lake Superior this
evening. High pressure becomes centered over northern Ontario at
30.5 inches on Monday, shifting to the Saint Lawrence Seaway on
Tuesday. A 29.7 inch low tracks from the northern Plains Tuesday
night to the James Bay at 29.6 inches by Thursday morning, dragging
a 29.9 inch trough across Lake Superior on Wednesday. High pressure
of 30.2 to 30.3 inches returns to the Upper Great Lakes late
Thursday into Friday.



LSZ162-252000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sun Oct 25 2026 /300 AM CDT Sun Oct 25 2026/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon, then diminishing to 5 to 15 knots late. Waves
building to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of rain showers. Waves building
to 2 to 4 feet.
.TUESDAY...East winds 15 to 25 knots. Rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots becoming south 10 to
20 knots after midnight. Showers likely after midnight. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ263-252000-
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-
400 AM EDT Sun Oct 25 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots veering northeast in the
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. A slight chance of rain
showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots veering west. A
chance of showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sun Oct 25 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight, then diminishing to 5 to 15 knots late. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.MONDAY...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Southeast winds 20 to 30 knots becoming south
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sun Oct 25 2026

.EARLY THIS MORNING...West winds 15 to 25 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. A slight chance of showers through early
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TONIGHT...West winds 15 to 25 knots veering north after
midnight. Waves building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. A chance of showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...South winds 20 to 30 knots veering west. A chance of
showers. Waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-252000-
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-
400 AM EDT Sun Oct 25 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Showers likely.
Waves 2 to 4 feet.
.TODAY...West winds 10 to 20 knots. A chance of showers through
early afternoon. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Waves 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Southeast winds 20 to 30 knots becoming south
gales to 35 knots after midnight. A chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...South gales to 35 knots becoming west 20 to
30 knots. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-252000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sun Oct 25 2026

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A chance of
showers. Waves 2 to 4 feet.
.TODAY...West winds 10 to 20 knots. Showers through early
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest. A
chance of showers. Waves subsiding to 2 to 4 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 5 to
15 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.

$$

LSZ261-251400-
MAFOR 2509/
Superior West 13610 12620 11710 12810. Waves 1 to 3 feet.

Superior North Central 11610 11620 13630 11720 12820. Waves 2 to
4 feet.

Superior South Central 14620 11620 11630 11730 11830. A chance of
showers this morning. Waves 1 to 3 feet today. Waves 2 to 4 feet
tonight.

Superior East 11526 11616 13610 12720 11820. Waves 2 to 4 feet.

$$

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