522
FZUS63 KMQT 081401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sat Aug 8 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...

Upper Michigan is situated between a 29.6 inch Quebec low and a 30.0
inch high centered over Iowa. This will drive weak and ill-defined
29.9 inch ridging/troughing over Lake Superior through Monday night
as the high moves southeast. Weak ridging of 30.0 inches, extending
between a 30.2 inch Bermuda high and 30.0 inch ridging over the
western Canadian provinces, returns for Monday and Tuesday before
decreasing to 29.9 inches on Wednesday. A 29.8 inch trough moves
over the lake Wednesday night before ridging of 30.0 inches returns
on Thursday from the Canadian Prairie.



LSZ162-082000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sat Aug 8 2026 /901 AM CDT Sat Aug 8 2026/

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots late. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then veering north late. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-082000-
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 Sat Aug 8 2026

.REST OF TODAY...West winds 5 to 15 knots becoming southwest
15 to 25 knots in the afternoon. Waves calm to 2 feet building to
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers. A slight chance of
thunderstorms after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west in the
afternoon, then backing southwest late. A chance of showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-082000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sat Aug 8 2026

.REST OF TODAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of showers after midnight.
Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. A
slight chance of showers through early afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds less than 10 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-082000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sat Aug 8 2026

.REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
chance of showers after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming east 5 to
15 knots in the afternoon. A chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

$$

LSZ266-082000-
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 Sat Aug 8 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West winds 10 to 20 knots. Waves calm to 2 feet
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering west late. A chance of
showers after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then backing northeast late. A chance
of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A slight chance of showers through midnight. Waves calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-082000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sat Aug 8 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy fog by late morning. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then becoming southwest 10 to 20 knots late. A slight
chance of showers after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then backing northeast late. A chance
of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A chance of showers through midnight. Waves calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-082000-
MAFOR 0815/
Superior West 14520 11610 11710 11800 11500. A chance of showers
overnight. Waves 2 feet or less.

Superior North Central 11620 13520 11510 13610. A chance of
showers overnight and Sunday morning. Waves 1 to 3 feet.

Superior South Central 13620 11510 11420 11520 11620 11610. A
chance of showers overnight and Sunday morning. Waves 1 to 3
feet.

Superior East 12610 11600 11500 13510 11610. A chance of showers
Sunday morning. Waves 1 to 2 feet.

$$

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