657
FZUS63 KMQT 091401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sun Aug 9 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 29.9 inch trough moves over the lake today into tonight. Then,
weak ridging of 29.9 inches returns on Monday and holds through
Tuesday. Another weak trough at 29.8 inches moves over the lake
Tuesday night into Wednesday before high pressure gradually builds
over the Great Lakes from western Canada through Friday to 30.1
inches.



LSZ162-092000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sun Aug 9 2026 /901 AM CDT Sun Aug 9 2026/

.REST OF TODAY...West winds 5 to 15 knots backing southwest in
the afternoon. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Patchy fog. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots becoming north less than
10 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.

$$

LSZ263-092000-
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 Sun Aug 9 2026

.REST OF TODAY...West winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing southwest late. Patchy
fog. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots diminishing to less than
10 knots after midnight. Patchy fog. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-092000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sun Aug 9 2026

.REST OF TODAY...West winds 5 to 15 knots backing southwest in
the afternoon. Patchy fog. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots. Patchy fog through
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Areas of dense fog through early
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds less than 10 knots veering west
after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-092000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sun Aug 9 2026

.REST OF TODAY...Southwest winds 5 to 15 knots backing east in
the afternoon. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Patchy fog through midnight, then areas of dense fog after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Patchy dense fog through
early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...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 by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-092000-
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 Sun Aug 9 2026

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

$$

LSZ267-092000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sun Aug 9 2026

.REST OF TODAY...South winds 5 to 15 knots backing northeast
late. A chance of showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight. A slight chance of showers through midnight. Patchy fog
through midnight, then areas of dense fog after midnight. Waves
calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then veering northwest late. Areas of dense fog
through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ261-092000-
MAFOR 0915/
Superior West 12600 11400 12500 13600. Waves 1 foot or less.

Superior North Central 11600 14500 13504. Waves 1 foot or less.

Superior South Central 11400 11210 11100 11200 11400 11500 12504.
Waves 1 foot or less.

Superior East 11500 11200 12100 11800 11804 12704. A chance of
showers late this morning and this evening. Waves 2 feet 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