397
FZUS63 KMQT 080801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 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...

A 29.8 inch trough continues to move east of Lake Superior early
this morning. By daybreak, the UP will be situated between a 29.5
inch Quebec low and a 30.0 inch Four Corners high. This will drive
weak and ill-defined 29.9 inch ridging/troughing over Lake Superior
through Monday night. 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.



LSZ162-082000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Aug 8 2026 /300 AM CDT Sat Aug 8 2026/

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots backing southwest in the
afternoon, then increasing to 15 to 25 knots late. Waves 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-
400 AM EDT Sat Aug 8 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots becoming southwest 15 to
25 knots in the afternoon. Waves 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-
400 AM EDT Sat Aug 8 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon, then backing southwest late. Waves 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-
400 AM EDT Sat Aug 8 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.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-
400 AM EDT Sat Aug 8 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...West winds 10 to 20 knots. Patchy fog through early
afternoon. Waves 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-
400 AM EDT Sat Aug 8 2026

.EARLY THIS MORNING...West winds 10 to 20 knots. Areas of dense
fog. Waves calm to 2 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Areas of dense fog through early afternoon. 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.

$$

LSZ261-081400-
MAFOR 0809/
Superior West 12610 14520 11610 11710. A chance of showers
overnight. Waves 2 feet or less.

Superior North Central 12610 11620 13520 11510 11610. A chance of
showers overnight. Waves 1 to 3 feet.

Superior South Central 14620 11620 11510 11420 11520. Waves 1 to
3 feet.

Superior East 11714 11614 12610 11600 11500 12510. 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