109
FZUS63 KMQT 262001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM 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
overnight. By Thursday morning, a 30.1 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. 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, with heights over Lake Superior
falling to 29.8 inches by Monday afternoon.



LSZ162-270800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Wed Aug 26 2026 /301 PM CDT Wed Aug 26 2026/

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing southeast late. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds less than 10 knots becoming east 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.
.SATURDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.MONDAY...East winds 15 to 25 knots becoming west 10 to 20 knots.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ263-270800-
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 Wed Aug 26 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late.
Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast late. A
slight chance of showers by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds less than 10 knots backing north
late. Waves calm to 2 feet.
.FRIDAY...East 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 backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-270800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Wed Aug 26 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. A slight chance
of showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late. A
slight chance of showers through midnight. 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. 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 south 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...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering southwest. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.

$$

LSZ265-270800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Wed Aug 26 2026

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 1 to
3 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 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 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. 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 becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. A chance of thunderstorms. Waves calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots veering southwest. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.

$$

LSZ266-270800-
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 Wed Aug 26 2026

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north late.
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...West 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 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ267-270800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Wed Aug 26 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest after
midnight, then increasing to 15 to 25 knots late. A slight chance
of showers through midnight. Patchy fog. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest late.
Patchy fog through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots late. 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 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves building to 1 to 3 feet.
.SUNDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ261-270200-
MAFOR 2621/
Superior West 11620 12720 12710 12700 11400. Waves 1 to 3 feet
subsiding to 1 foot or less tonight. Waves 1 foot or less
Thursday.

Superior North Central 12620 11730 11830 12820 11810 11700. Waves
1 to 3 feet.

Superior South Central 13730 12740 11830 11820 11810. Waves 2 to
4 feet tonight. Waves 3 to 5 feet subsiding to 1 to 3 feet
Thursday.

Superior East 12610 11720 12730 11830 11820 11710. Waves 1 to 3
feet building to 2 to 4 feet tonight. Waves 3 to 5 feet subsiding
to 2 to 3 feet Thursday.

$$

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