714
FZUS63 KMQT 130803 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
403 AM EDT Sun Sep 13 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...

30.0 inch ridging builds into Lake Superior this morning and
strengthens to 30.2 inches tonight into Monday. A low around 29.3
inches skirts by Lake Winnipeg into northern Ontario Monday night,
bringing 29.7 inch troughing over Lake Superior. In its stead, 30.2
inch high pressure ridging develops over the Northern Plains on
Tuesday, which strengthens to 30.4 inches as it cross the Upper
Great Lakes by Wednesday. The high pressure ridging looks to remain
through the rest of the workweek.



LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 AM EDT Sun Sep 13 2026 /303 AM CDT Sun Sep 13 2026/

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH TUESDAY
AFTERNOON...

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
late. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.TONIGHT...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 increasing to 10 to 20 knots
in the afternoon, then becoming southeast 20 to 30 knots late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...South gales to 35 knots veering southwest after
midnight. Showers and a slight chance of thunderstorms through
midnight, then a slight chance of showers after midnight. Waves
building to 5 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 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering north. Waves
calm to 2 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-
403 AM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...West winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...West winds 20 to 30 knots. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.TONIGHT...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 increasing to 10 to 20 knots
in the afternoon, then becoming southeast 20 to 30 knots late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South gales to 35 knots becoming southwest gales
to 40 knots after midnight. Showers and a slight chance of
thunderstorms through midnight, then a chance of showers after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...West gales to 45 knots. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 AM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. A slight
chance of showers. Waves 2 to 4 feet.
.TODAY...Northwest winds 15 to 25 knots. 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.
.TONIGHT...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 20 to
30 knots late. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South gales to 40 knots. Showers through
midnight, then a chance of showers after midnight. Waves building
to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 45 knots. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering northwest. A
chance of showers. Waves calm to 2 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 AM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Waves 2 to
4 feet.
.TODAY...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 building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. Waves building to
3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...South gales to 40 knots. A slight chance of
thunderstorms through midnight. Showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...West gales to 45 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...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering north. A
chance of showers. Waves 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-
403 AM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. A slight
chance of showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...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 8 feet
occasionally to 10 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon, then becoming southeast 20 to 30 knots
late. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.
.MONDAY NIGHT...South gales to 45 knots. Showers. Waves building
to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...Southwest gales to 40 knots veering west by mid
afternoon. Waves subsiding to 7 to 10 feet occasionally to
13 feet, then building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY NIGHT...West gales to 35 knots becoming northwest 10 to
20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering north. A chance
of showers. Waves calm to 2 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 AM EDT Sun Sep 13 2026

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 10 to 20 knots late. Waves
subsiding to calm to 2 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 veering west by mid
afternoon. Waves subsiding to 5 to 8 feet occasionally to
10 feet, then building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming north 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-131400-
MAFOR 1309/
Superior West 13630 11620 12720 11710 11700. Waves 1 to 3 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet today.
Waves 1 to 3 feet subsiding to 1 foot or less tonight.

Superior North Central 11720 12730 12740 11720 11710 11700. Waves
2 to 4 feet building to 3 to 5 feet today. Waves 2 to 4 feet
subsiding to 1 to 2 feet tonight.

Superior South Central 11740 11730 13740 19750 11740 11720 11710. A
chance of showers today. Waves 3 to 5 feet building to 4 to 7 feet
today. Waves 4 to 7 feet subsiding to 1 to 3 feet tonight.

Superior East 12720 14730 11720 11710. A chance of showers today.
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