105
FZUS63 KMQT 171401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM 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...

30.0 inch high pressure shifts east of Lake Superior this afternoon.
A 29.7 inch low crosses the lake 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.



LSZ162-172000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Fri Jul 17 2026 /901 AM CDT Fri Jul 17 2026/

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS
EVENING...

.REST OF TODAY...East winds 5 to 15 knots. Smoke. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest late. 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. Areas of smoke. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming south less
than 10 knots after midnight. Areas of smoke through midnight.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of thunderstorms. Showers
likely after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west. A chance
of showers and thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding 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.

$$

LSZ263-172000-
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-
1001 AM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 5 to 15 knots backing east late.
Smoke. A chance of showers and thunderstorms. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. Areas
of smoke. A chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest late.
Smoke. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Areas of smoke through midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
20 to 30 knots after midnight. Showers likely and a chance of
thunderstorms after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west. A chance
of showers and thunderstorms. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.

$$

LSZ264-172000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...Southeast winds 5 to 15 knots. Smoke. Showers by
late morning. A chance of thunderstorms. A chance of showers by
mid afternoon. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering west after midnight,
then becoming northwest 10 to 20 knots late. Areas of smoke. A
chance of thunderstorms through midnight. A chance of showers.
Waves 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. Smoke. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming southwest
less than 10 knots after midnight. Areas of smoke through
midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south by mid
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 veering west. Showers
likely. A chance of thunderstorms. A chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.

$$

LSZ265-172000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...Southeast winds 10 to 20 knots. Smoke. Showers
likely and a slight chance of thunderstorms. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Areas of smoke. A chance of
thunderstorms through midnight. A chance of showers. 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 becoming
southwest 5 to 15 knots after midnight. Areas of smoke through
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest gales to 35 knots becoming west gales to
40 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Northwest gales to 45 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ266-172000-
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-
1001 AM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...South winds 10 to 20 knots backing southeast in
the afternoon. Smoke. Showers likely by late morning. A slight
chance of thunderstorms. A chance of showers by mid afternoon.
Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then becoming northwest 15 to 25 knots late. Smoke. A
chance of showers and thunderstorms. Waves building to 2 to
4 feet.
.SATURDAY...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.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Smoke through midnight. Waves subsiding to calm
to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
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 3 to 5 feet occasionally to 7 feet.
.MONDAY...South winds 20 to 30 knots becoming west gales to
40 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Northwest gales to 45 knots. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ267-172000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Fri Jul 17 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.REST OF TODAY...Southeast winds 10 to 20 knots. Smoke. A chance
of showers. A slight chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots veering west late. Smoke.
Showers likely 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. Areas of smoke. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Areas of smoke through midnight.
Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A chance of showers after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...South winds 20 to 30 knots veering west. Showers and a
chance of thunderstorms. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northwest gales to 35 knots. Waves building to 7 to
11 feet occasionally to 14 feet.

$$

LSZ261-172000-
MAFOR 1715/
Superior West 12200 11100 11710 12610 12710. A chance of showers
this afternoon. A chance of showers and thunderstorms this
evening. Waves 2 feet or less.

Superior North Central 12316 11310 11410 11510 11620 12720. A
chance of thunderstorms this afternoon and evening. Waves 1 to 3
feet.

Superior South Central 12326 11320 11426 11526 11630 12730. A
chance of thunderstorms this evening. Waves 1 to 3 feet this
afternoon. Waves 2 to 4 feet tonight. Waves 3 to 5 feet Saturday
morning.

Superior East 12316 11310 11326 11426 11520 11720 11730. A chance
of thunderstorms tonight. Waves 1 to 2 feet this afternoon. Waves
2 to 4 feet tonight. Waves 2 to 4 feet building to 3 to 5 feet
Saturday morning.

$$

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