047
FZUS63 KMQT 172001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Fri Jul 17 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 crosses Lake Superior tonight and moves to southern
Quebec by Saturday afternoon. Weak ridging of around 30.0 inches
returns to the Great Lakes late Saturday 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.



LSZ162-180800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Fri Jul 17 2026 /301 PM CDT Fri Jul 17 2026/

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT /5 AM CDT/
SATURDAY...

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

$$

LSZ263-180800-
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 Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT SATURDAY...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Smoke. A chance
of showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots. A chance of showers and
thunderstorms through midnight. Smoke. Waves building to 1 to
3 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest late.
Patchy smoke. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southeast
after midnight, then veering south late. Areas of smoke. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Smoke through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
building to 2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots. A chance of showers
through early afternoon. Showers likely by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of showers. Waves subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-180800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT SATURDAY...

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Smoke. A
chance of showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering west after
midnight, then becoming northwest 10 to 20 knots late. A chance
of showers and thunderstorms through midnight. Smoke. Waves
building to 2 to 4 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. Smoke. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing south late.
Areas of smoke. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Areas of smoke through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Showers likely and a chance of
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. 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 building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-180800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT SATURDAY...

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Smoke. A
chance of showers and a slight chance of thunderstorms. Waves
1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
A chance of showers and thunderstorms through midnight. Smoke.
Waves building to 2 to 4 feet.
.SATURDAY...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.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing south late. Areas of
smoke. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Areas of smoke through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
20 to 30 knots after midnight. A chance of showers after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 20 to 30 knots. Showers likely and a
chance of thunderstorms. Waves building to 2 to 4 feet.
.MONDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest gales to 45 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.

$$

LSZ266-180800-
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 Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT SATURDAY...

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Smoke. A
chance of showers and a slight chance of thunderstorms. Waves
1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then becoming northwest 15 to 25 knots late. Smoke.
Showers likely and a chance of thunderstorms through midnight. A
slight chance of showers after midnight. Waves building to 2 to
4 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Smoke. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then veering south late. Smoke.
Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Areas of smoke through early
afternoon. 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 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...West winds 15 to 25 knots increasing to gales to
35 knots after midnight. Showers likely 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 9 to
12 feet occasionally to 15 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.

$$

LSZ267-180800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 6 AM EDT SATURDAY...

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Smoke. A
chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots veering west late. Smoke.
Showers through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Smoke. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then backing west late. Smoke
through midnight, then patchy smoke after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Patchy smoke through early afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots. A chance of showers through
early afternoon. A chance of thunderstorms. Showers by mid
afternoon. Waves 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 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-180200-
MAFOR 1721/
Superior West 11200 11810 12610 12710 11700 11500. A chance of
showers this evening. Waves 2 feet or less.

Superior North Central 12316 11510 11620 13720 11710. A chance of
thunderstorms this evening. Waves 1 to 3 feet tonight. Waves 2 to
4 feet subsiding to 1 to 2 feet Saturday.

Superior South Central 11320 11426 11520 11630 14730. A chance of
thunderstorms tonight. Waves 2 to 4 feet tonight. Waves 3 to 5
feet subsiding to 2 to 4 feet Saturday.

Superior East 11310 11326 11426 11520 11720 11730 12720. A chance
of thunderstorms tonight. Waves 1 to 3 feet building to 2 to 4
feet tonight. Waves 3 to 5 feet Saturday.

$$

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