666
FZUS63 KMQT 242001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Aug 24 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 30.0 inch high pressure moves through the western Great Lakes
today before building back to 30.1 inches over the Lower Peninsula
of Michigan by Tuesday morning. Meanwhile, 29.7 inch Clipper low
pressure over Saskatchewan this afternoon moves across southern
Manitoba on Tuesday as it weakens to 29.8 inches. This Clipper moves
over Lake Superior by Wednesday morning before lifting away towards
James Bay and northern Quebec Wednesday night into Thursday morning.
30.1 inch high pressure ridging returns to Lake Superior by Friday
afternoon, building to 30.2 inches over the Lower Great Lakes for
Saturday.



LSZ162-250800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon Aug 24 2026 /301 PM CDT Mon Aug 24 2026/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers
after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering west after
midnight, then increasing to 10 to 20 knots late. A slight chance
of thunderstorms through midnight. A chance of showers. Waves
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest by
mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ263-250800-
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 Mon Aug 24 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast after
midnight, then veering south late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east late. A chance
of showers. A chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight, then becoming west 10 to 20 knots late. A chance
of showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.WEDNESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of showers. Waves
building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...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.

$$

LSZ264-250800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon Aug 24 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots becoming south less than
10 knots late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
late. Showers likely through midnight. A chance of thunderstorms.
A chance of showers after midnight. Waves building to 1 to
3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ265-250800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon Aug 24 2026

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers and a slight chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. Showers likely
through midnight. A slight chance of thunderstorms. A chance of
showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY...West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. Waves building to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-250800-
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 Mon Aug 24 2026

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west after
midnight, then backing south late. Waves subsiding to calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers and a slight chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers through midnight. A slight
chance of thunderstorms. Showers likely after midnight. Waves
building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots. Waves building
to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering south. 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.

$$

LSZ267-250800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon Aug 24 2026

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. 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 backing west late. Waves subsiding
to calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A chance of showers
through midnight. A slight chance of thunderstorms. Showers after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots veering west by mid
afternoon. Showers through early afternoon. A slight chance of
thunderstorms. A chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Northwest winds 15 to 25 knots. Waves 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ261-250200-
MAFOR 2421/
Superior West 11400 11300 12200 12300 11400 11300. A chance of
showers Tuesday morning, then a chance of showers and
thunderstorms Tuesday afternoon. Waves 1 foot or less.

Superior North Central 12610 11600 11500 12400 12310. A chance of
showers Tuesday afternoon. Waves 2 feet or less.

Superior South Central 11710 11600 11500 12400 11410 12310. Waves
2 feet or less.

Superior East 11720 12710 11700 11600 11500 11400 11310. Waves 1
to 3 feet tonight. Waves 1 foot or less Tuesday.

$$

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