635
FZUS63 KMQT 180801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sat Jul 18 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 29.7 inch low moves to afternoon. Weak ridging of around 30.0
inches returns to the Great Lakes this evening and persists through
Sunday. A strong low ranging from 29.1 to 29.4 inches over northern
Ontario looks to bring troughing of around 29.5 inches over Lake
Superior on Monday. Then a 30.1 inch ridge descends southeast over
the Midwest Tuesday through Wednesday night.



LSZ162-182000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Jul 18 2026 /300 AM CDT Sat Jul 18 2026/

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT /5 AM CDT/ EARLY
THIS MORNING...

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

$$

LSZ263-182000-
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-
400 AM EDT Sat Jul 18 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy
smoke. Waves calm to 2 feet.
.TODAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. Smoke
through early afternoon, then patchy smoke by mid afternoon. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight.
Smoke. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south late.
Smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Areas of smoke through midnight. A
chance of showers and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Showers likely. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A chance of showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-182000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sat Jul 18 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy
smoke. Waves 1 to 3 feet.
.TODAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Smoke. Waves
subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming south less than
10 knots late. Smoke. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. Smoke through midnight. A chance
of showers through midnight. A slight chance of thunderstorms.
Showers likely after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots. Showers. A chance of
thunderstorms by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A chance of showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-182000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sat Jul 18 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Patchy
smoke. Waves 2 to 4 feet.
.TODAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Smoke. 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 diminishing to 5 to
15 knots after midnight, then backing south late. Smoke. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Areas of smoke. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
20 to 30 knots after midnight. Areas of smoke through midnight. A
chance of showers and a slight chance of thunderstorms after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 20 to 30 knots. Showers. A chance of
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. Showers likely and a chance of
thunderstorms through midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northwest gales to 40 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-182000-
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-
400 AM EDT Sat Jul 18 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Patchy
smoke. Waves 2 to 4 feet.
.TODAY...Northwest winds 15 to 25 knots. Patchy smoke through
early afternoon, then smoke by mid 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 becoming north 5 to
15 knots after midnight, then backing southwest late. Smoke.
Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Areas of smoke. Waves calm
to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms after midnight. Waves building to 2 to 4 feet.
.MONDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Showers and a chance of thunderstorms.
Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Showers likely and a chance of
thunderstorms through midnight. Waves subsiding to 2 to 4 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest gales to 40 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-182000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sat Jul 18 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT EARLY THIS
MORNING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Areas of
smoke. Waves 2 to 4 feet.
.TODAY...Northwest winds 15 to 25 knots. Areas of smoke. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then backing west late. Patchy smoke
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms after midnight. Waves building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots. A chance of showers through
early afternoon. Showers by mid afternoon. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Showers likely and a chance of thunderstorms through
midnight, then a chance of showers after midnight. Waves building
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest gales to 35 knots. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-181400-
MAFOR 1809/
Superior West 11720 11710 11600 13500 12400. Waves 2 feet or
less.

Superior North Central 13720 11710 12610 11600 11500. Waves 1 to
3 feet today. Waves 2 feet or less tonight.

Superior South Central 12740 12730 12720 11710 11600. Waves 3 to
5 feet subsiding to 2 to 4 feet today. Waves 1 to 3 feet
subsiding to 1 foot or less tonight.

Superior East 11730 14720 11720 11810 11700. Waves 3 to 5 feet
subsiding to 2 to 4 feet today. Waves 2 to 4 feet subsiding to 1
to 2 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