223
FZUS63 KMQT 130801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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...

29.8 inch troughing remains over Lake Superior the rest of this
morning as a 29.1 inch low over southwest Manitoba continues
northeast to Hudson Bay tonight, gradually weakening to 29.5 inches
as it does so. A 30.5 inch high builds in over the Canadian Prairies
into Tuesday, shifting 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 shifts 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 29.6 inch
troughing over Lake Superior Friday and Friday night.


LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Mon Oct 13 2025 /301 AM CDT Mon Oct 13 2025/

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A slight
chance of showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves calm to
2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after 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 veering south. Showers
likely. Waves building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. Showers
likely, then a chance of showers. Waves subsiding to 1 to 3 feet.

$$

LSZ263-132000-
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 AM EDT Mon Oct 13 2025

.EARLY THIS MORNING...Southwest winds 20 to 30 knots. A chance of
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then diminishing to 15 to 25 knots late. Waves
building to 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...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots becoming north
less than 10 knots after 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 increasing to 15 to
25 knots. Showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet.

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Mon Oct 13 2025

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...

.EARLY THIS MORNING...South winds 15 to 25 knots. Showers. Waves
4 to 8 feet occasionally to 10 feet.
.TODAY...Southwest winds 15 to 25 knots veering west in the
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to 3 to 6 feet occasionally to 8 feet, then
building to 5 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...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds less than 10 knots becoming
south 5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots. Showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Mon Oct 13 2025

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...

.EARLY THIS MORNING...South winds 15 to 25 knots. Showers likely.
Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of showers through early afternoon. Waves
subsiding to 1 to 3 feet, then 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 diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. Showers. Waves building to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots. Showers likely. Waves subsiding to calm to 2 feet.

$$

LSZ266-132000-
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 AM EDT Mon Oct 13 2025

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...

.EARLY THIS MORNING...South winds 20 to 30 knots. A chance of
showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...South winds 15 to 25 knots veering west late. A chance
of showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight, then increasing to 20 to 30 knots late. Waves subsiding
to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers, then showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots. Showers likely. Waves subsiding to 2 to 4 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Mon Oct 13 2025

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

$$

LSZ261-131400-
MAFOR 1309/
Superior West 11530 14630 11620 12720. A chance of showers early
this morning. Waves 3 to 6 feet today. Waves 3 to 5 feet
subsiding to 1 to 3 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...11436 11540
13640 11630 12730. Waves 5 to 8 feet.

Superior South Central...GALE WARNING IN EFFECT...11446 11430
11520 13630 12730. Waves 3 to 6 feet subsiding to 1 to 3 feet,
then building to 2 to 4 feet today. Waves 3 to 5 feet tonight.

Superior East...GALE WARNING IN EFFECT...11430 12436 11520 12620
12730. Waves 3 to 5 feet subsiding to 2 to 4 feet today. Waves 3
to 6 feet building to 4 to 7 feet tonight.

$$

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