680
FZUS63 KMQT 122001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sat Sep 12 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...

A cold front and 29.7 inch trough continue to shift east of the lake
this evening. 30.0 inch ridging builds back in from the northern
Plains on Sunday and strengthens to 30.2 inches on Monday. A low
averaging 29.4 inches crosses northern Ontario on Tuesday, with a
strong 30.4 inch high building across Lake Superior on Wednesday.



LSZ162-130800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sat Sep 12 2026 /301 PM CDT Sat Sep 12 2026/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots diminishing to less
than 10 knots late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. Showers likely by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast gales to 35 knots veering southwest
after midnight. Showers through midnight. Waves building to 4 to
7 feet occasionally to 9 feet.
.TUESDAY...West gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northeast. Waves
calm to 2 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-
401 PM EDT Sat Sep 12 2026

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots becoming southeast 20 to
30 knots by mid afternoon. A chance of showers by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers through midnight, then a chance of showers
after midnight. Waves building to 4 to 8 feet occasionally to
10 feet.
.TUESDAY...West gales to 40 knots. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ264-130800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sat Sep 12 2026

.LATE THIS AFTERNOON...West winds to 30 knots with a few gale
force gusts to 35 knots possible. Waves 4 to 7 feet occasionally
to 9 feet subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west in the
afternoon, then veering northwest late. A slight chance of
showers through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...South gales to 35 knots. Showers. Waves building
to 6 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 40 knots. Waves subsiding to 4 to 7 feet
occasionally to 9 feet, then building to 6 to 9 feet occasionally
to 11 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-130800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sat Sep 12 2026

.LATE THIS AFTERNOON...West winds to 30 knots with a few gale
force gusts to 35 knots possible. Waves 3 to 6 feet occasionally
to 8 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds to 30 knots with a few gale force gusts to
35 knots possible becoming northwest 20 to 30 knots after
midnight. Waves 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southeast 20 to
30 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South gales to 40 knots. Showers. Waves building
to 6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.TUESDAY...Southwest gales to 35 knots becoming west gales to
40 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering north. Waves 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-
401 PM EDT Sat Sep 12 2026

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest after
midnight, then diminishing to 15 to 25 knots late. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
5 to 15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 20 to
30 knots by mid afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South gales to 40 knots. Showers. Waves building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...Southwest gales to 35 knots becoming west gales to
40 knots by mid afternoon. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots becoming north 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering east. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
calm to 2 feet.

$$

LSZ267-130800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sat Sep 12 2026

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest after
midnight, then diminishing to 15 to 25 knots late. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
10 to 20 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 20 to 30 knots increasing to gales to
40 knots after midnight. Showers. Waves building to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY...Southwest gales to 35 knots becoming west 20 to
30 knots by mid 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.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming north 10 to
20 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. Waves
calm to 2 feet.

$$

LSZ261-130200-
MAFOR 1221/
Superior West 12630 12730 11720 12730 11620. Waves 2 to 4 feet
subsiding to 1 to 3 feet tonight. Waves 1 to 3 feet Sunday.

Superior North Central 11650 11640 11630 11730 11720 12730 11640.
Waves 3 to 6 feet building to 4 to 7 feet, then subsiding to 3 to
6 feet tonight. Waves 2 to 4 feet Sunday.

Superior South Central 11650 11640 12740 11730 11740 12750. A
chance of showers Sunday afternoon. Waves 3 to 6 feet tonight.
Waves 3 to 6 feet building to 4 to 7 feet Sunday.

Superior East 13630 11730 12720 12730. A chance of showers Sunday
afternoon. Waves 3 to 6 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