604
FZUS63 KMQT 150201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Tue Oct 14 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 builds into Lake Superior this evening, eventually
shifting across the Great Lakes and northern Ontario Wednesday as it
weakens to around 30.3 inches. Ridging continues to weaken to 30.1
inches over Lake Superior through Thursday as troughing develops
over the Plains and the parent high moves east. Thursday night
through Friday, a deepening 29.3 inch low develops over the Northern
Plains and lifts near to Lake Winnipeg. This low is projected to
bring 29.5 to 29.6 inch troughing over Lake Superior Friday into
Saturday as the low moves to Hudson Bay. By Sunday afternoon,
another low develops over southern Ontario then lifts north towards
Quebec as 29.7 inch ridging builds over Lake Superior.


LSZ162-150800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Tue Oct 14 2025 /901 PM CDT Tue Oct 14 2025/

.REST OF TONIGHT...West winds 5 to 15 knots backing southeast
after midnight, then backing east late. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering southeast
late. A slight chance of showers after midnight. Waves calm to
2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. Showers. Waves calm
to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of showers. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
showers through midnight. Waves 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-150800-
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 Oct 14 2025

.REST OF TONIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.WEDNESDAY...West winds less than 10 knots becoming southwest
5 to 15 knots late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds less than 10 knots becoming
southeast 5 to 15 knots after midnight, then veering south late.
Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Showers likely.
Waves 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers. Waves
1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.SATURDAY...West gales to 35 knots diminishing to 15 to 25 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West gales to 35 knots becoming northwest 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet.

$$

LSZ264-150800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Tue Oct 14 2025

.REST OF TONIGHT...Northwest winds less than 10 knots veering
north late. Waves calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then diminishing to less than 10 knots
late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds less than 10 knots backing
southwest after midnight, then becoming south 5 to 15 knots late.
Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. A slight chance of showers through
early afternoon, then showers likely by mid afternoon. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers. Waves 2 to 4 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-150800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Tue Oct 14 2025

.REST OF TONIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest in the
afternoon, then veering north late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds less than 10 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. A slight chance of showers through
early afternoon, then showers likely by mid afternoon. Waves calm
to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. Showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Showers likely
through midnight, then a chance of showers after midnight. Waves
calm to 2 feet.
.SATURDAY...West winds 15 to 25 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ266-150800-
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 Oct 14 2025

.REST OF TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet subsiding to calm to
2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds less than 10 knots increasing
to 5 to 15 knots after midnight, then backing south late. Waves
calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest. Showers
likely, then 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.

$$

LSZ267-150800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Tue Oct 14 2025

.REST OF TONIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots late. Waves 2 to 4 feet subsiding to calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest in
the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
late. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Showers through early afternoon, then a chance
of showers by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering west. Showers
likely. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots. Showers likely, then a chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-150800-
MAFOR 1503/
Superior West 12400 11500 14300 11200. Waves 1 foot or less.

Superior North Central 11700 12800 14600 11600. Waves 1 foot or
less.

Superior South Central 14800 12700 11800 11700. Waves 2 feet or
less.

Superior East 11810 11800 11100 11800 14700. Waves 1 to 3 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