905
FZUS63 KMQT 122007 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
407 PM EDT Sun Oct 12 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...

Weak 29.9 inch ridging extends over eastern Lake Superior off a 30.4
inch high over the Gulf of St. Lawrence. A 29.2 inch low over
southwest Manitoba lifts northeast to Hudson Bay tonight through
Monday, extending a 29.8 inch trough over western Lake Superior. A
30.5 inch high builds in over the Canadian Prairies Monday night
into Tuesday, shifting east to the Great Lakes and northern Ontario
by Wednesday at 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 northeast. Thursday night through Friday,
a 29.4 inch low develops over the Northern Plains, lifting to
northwestern Ontario.


LSZ162-130800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
407 PM EDT Sun Oct 12 2025 /307 PM CDT Sun Oct 12 2025/

.LATE THIS AFTERNOON...Southeast winds 20 to 30 knots. A slight
chance of showers. Waves 2 to 4 feet.
.TONIGHT...Southeast winds 20 to 30 knots veering southwest late.
Showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
late. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest by mid
afternoon. 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 becoming south 15 to
25 knots. Showers likely. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 1 to 3 feet.

$$

LSZ263-130800-
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-
407 PM EDT Sun Oct 12 2025

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. A slight
chance of showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming south 20 to
30 knots after midnight. A chance of showers through midnight,
then showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots. A slight chance of showers
through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then 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...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest 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. A chance of showers, then showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet.

$$

LSZ264-130800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
407 PM EDT Sun Oct 12 2025

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.LATE THIS AFTERNOON...Southeast winds 20 to 30 knots. A slight
chance of showers. Waves 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Southeast gales to 35 knots veering south after
midnight, then diminishing to 20 to 30 knots late. A slight
chance of showers through midnight, then showers after midnight.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of showers through early afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. 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...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of showers, then 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.

$$

LSZ265-130800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
407 PM EDT Sun Oct 12 2025

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.LATE THIS AFTERNOON...Southeast gales to 35 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...South gales to 35 knots. Showers after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.MONDAY...South winds 15 to 25 knots veering west in the
afternoon. A chance of showers through early afternoon. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.MONDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 1 to 3 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots. Showers likely. Waves subsiding to calm to 2 feet.

$$

LSZ266-130800-
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-
407 PM EDT Sun Oct 12 2025

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.LATE THIS AFTERNOON...Southeast winds 20 to 30 knots. Waves 4 to
8 feet occasionally to 10 feet.
.TONIGHT...South gales to 35 knots. A chance of showers after
midnight. Waves building to 5 to 9 feet occasionally to 11 feet.
.MONDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots in the afternoon, then veering west late. A chance of
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. 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 10 to 20 knots increasing to 20 to
30 knots. A chance of showers, then showers likely. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...South winds 20 to 30 knots. Showers likely. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-130800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
407 PM EDT Sun Oct 12 2025

.LATE THIS AFTERNOON...Southeast winds 20 to 30 knots. Waves 2 to
4 feet.
.TONIGHT...Southeast winds 20 to 30 knots becoming south to
30 knots with a few gale force gusts to 35 knots possible after
midnight, then diminishing to 20 to 30 knots late. 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 in the afternoon, then becoming west 10 to 20 knots
late. Showers likely through early afternoon. A chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots increasing to
20 to 30 knots. A slight chance of showers through midnight.
Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 15 to 25 knots. 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 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots. Showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots. Showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-130200-
MAFOR 1221/
Superior West 12330 11436 11446 11540 11630 12640. Waves 2 to 4
feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Monday.

Superior North Central...GALE WARNING IN EFFECT...12350 11450
11440 11446 11540 12640. Waves 5 to 8 feet building to 6 to 10
feet tonight. Waves 5 to 8 feet Monday.

Superior South Central...GALE WARNING IN EFFECT...11340 13450
11446 11436 11520 11630. Waves 3 to 6 feet building to 4 to 7
feet, then subsiding to 3 to 6 feet tonight. Waves 3 to 6 feet
subsiding to 1 to 3 feet Monday.

Superior East...GALE WARNING IN EFFECT...11330 12340 12440 19450 12436
11520. Waves 3 to 6 feet building to 4 to 7 feet tonight. Waves 3 to
6 feet subsiding to 2 to 4 feet Monday.

$$

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