593
FZUS63 KMQT 100801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Mon Aug 10 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...

Weak 29.9 inch ridge builds over the lake today and persists through
Tuesday. Weak troughing of around 29.8 inches moves over the lake
Tuesday night into Wednesday before high pressure gradually builds
over the Great Lakes from western Canada late in the week,
strengthening to 30.2 inches by Friday.



LSZ162-102000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Mon Aug 10 2026 /301 AM CDT Mon Aug 10 2026/

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering northwest late.
Waves calm to 2 feet.
.TUESDAY...North winds less than 10 knots veering south in the
afternoon, then becoming east 5 to 15 knots late. A slight chance
of showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-102000-
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 AM EDT Mon Aug 10 2026

.EARLY THIS MORNING...West winds less than 10 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Patchy dense
fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then diminishing to less than 10 knots late. Waves calm
to 2 feet.
.TUESDAY...West winds less than 10 knots becoming north 5 to
15 knots in the afternoon, then veering south late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY...West winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ264-102000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Mon Aug 10 2026

.EARLY THIS MORNING...West winds less than 10 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest late. Patchy
dense fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots diminishing to less than
10 knots late. Waves calm to 2 feet.
.TUESDAY...Southwest winds less than 10 knots backing south in
the afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds less than 10 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest less
than 10 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds less than 10 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-102000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Mon Aug 10 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...West winds 5 to 15 knots. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing east in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers after midnight. Waves calm to
2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-102000-
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 AM EDT Mon Aug 10 2026

.EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots. Patchy dense fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ267-102000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Mon Aug 10 2026

.EARLY THIS MORNING...North winds 5 to 15 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Patchy fog through early afternoon. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east in the
afternoon, then backing northeast late. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A slight chance of showers. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ261-101400-
MAFOR 1009/
Superior West 13600 13510 12600. Waves 1 foot or less.

Superior North Central 12600 19604 11600 14510 11500. Waves 2
feet or less.

Superior South Central 11700 12610 11700 11600 13500. Waves 1
foot or less.

Superior East 11800 19804 11700 19704 14600 11600 11500. Waves 1
foot or less.

$$

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