388
FZUS63 KMQT 261401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Wed Aug 26 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 Clipper over Lake Superior today lifts into James Bay by
this evening. By Thursday morning, a 30.2 inch high pressure over
Manitoba starts stretching towards Lake Superior. This high moves
over the lake by Friday morning before continuing into New England
on Saturday. On Saturday night, a low pressure over the Central to
Northern Plains deepens to 29.6 inches. This low approaches the
Great Lakes by early next week.



LSZ162-262000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed Aug 26 2026 /901 AM CDT Wed Aug 26 2026/

.REST OF TODAY...West winds 15 to 25 knots. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing south late. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast. A chance
of showers. Waves building to 1 to 3 feet.

$$

LSZ263-262000-
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 Wed Aug 26 2026

.REST OF TODAY...West winds 15 to 25 knots. A slight chance of
showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering north late. A slight chance
of showers through midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds less than 10 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ264-262000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Wed Aug 26 2026

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers by mid afternoon. Waves
1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late. A
chance of showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest late. A
slight chance of showers through early afternoon. Waves subsiding
to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ265-262000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Wed Aug 26 2026

.REST OF TODAY...West winds 15 to 25 knots becoming northwest
20 to 30 knots late. A slight chance of showers and
thunderstorms. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A slight chance of showers through midnight. Waves building to
2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-262000-
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 Wed Aug 26 2026

.REST OF TODAY...Southwest winds 10 to 20 knots veering west in
the afternoon, then becoming northwest 15 to 25 knots late. A
slight chance of showers and thunderstorms by late morning. Waves
1 to 3 feet subsiding to calm to 2 feet, then building to 1 to
3 feet.
.TONIGHT...Northwest winds 15 to 25 knots. A slight chance of
showers through midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing northwest late. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots. A chance of showers. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-262000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Wed Aug 26 2026

.REST OF TODAY...South winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. A chance of showers and thunderstorms.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 15 to
25 knots after midnight. A slight chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest in the
afternoon. A slight chance of showers through early afternoon.
Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots. A chance of showers. Waves
subsiding to calm to 2 feet.

$$

LSZ261-262000-
MAFOR 2615/
Superior West 13620 11720 13710 11700. Waves 1 to 3 feet this
afternoon and tonight. Waves 1 foot or less Thursday morning.

Superior North Central 14620 12720 11820 11810. Waves 1 to 3
feet.

Superior South Central 12630 14730 11730 11830. Waves 1 to 3 feet
this afternoon. Waves 2 to 4 feet tonight and Thursday morning.

Superior East 11510 12610 11710 11720 12730 11830. A chance of
showers this afternoon. Waves 1 to 3 feet this afternoon. Waves 1
to 3 feet building to 2 to 4 feet tonight. Waves 3 to 5 feet
Thursday 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