349
FZUS63 KMQT 132001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Oct 13 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 30.5 inch high builds over the Canadian Prairie into Tuesday,
increasing ridging over Lake Superior. This high shifts east to the
Great Lakes and northern Ontario by Wednesday at around 30.3 inches.
Ridging weakens to 30.0 inches over Lake Superior through Thursday
as troughing develops over the Plains and the parent high moves
east. Thursday night through Friday, a 29.4 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
this weekend as the low traverses northern Ontario.


LSZ162-140800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon Oct 13 2025 /301 PM CDT Mon Oct 13 2025/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots veering north late. Waves
subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots backing east after
midnight. A slight chance of showers through midnight. 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
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. Showers. Waves calm
to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Showers likely.
Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-140800-
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-
401 PM EDT Mon Oct 13 2025

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds less than 10 knots veering north
late. A slight chance of showers through midnight. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds less than 10 knots becoming
southwest 5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. 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 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 15 to 25 knots veering southwest. A chance
of showers. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-140800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon Oct 13 2025

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 5 to
8 feet occasionally to 10 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight, then diminishing to less than 10 knots late.
Waves calm to 2 feet.
.WEDNESDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.WEDNESDAY NIGHT...South winds less than 10 knots increasing to
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. 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, then a
chance of showers. Waves 2 to 4 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-140800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon Oct 13 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. 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. Showers likely. Waves calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-140800-
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-
401 PM EDT Mon Oct 13 2025

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 4 to
8 feet occasionally to 10 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...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 by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...South winds 20 to 30 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots. Showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. A chance
of showers. Waves 2 to 4 feet.

$$

LSZ267-140800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon Oct 13 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A chance of
showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest by
mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots. Showers. Waves 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.

$$

LSZ261-140200-
MAFOR 1321/
Superior West 11630 11620 12720 11820 12810 11700. Waves 3 to 5
feet subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet
subsiding to 1 foot or less Tuesday.

Superior North Central 11640 11630 14730 11820 11710. Waves 5 to
8 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet
Tuesday.

Superior South Central 12630 13730 11720 11820 11720. Waves 2 to
4 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet
subsiding to 2 to 4 feet Tuesday.

Superior East 11620 11720 14730 12720. Waves 2 to 3 feet building
to 3 to 6 feet tonight. Waves 4 to 7 feet subsiding to 3 to 5
feet Tuesday.

$$

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