418
FZUS63 KMQT 010201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Mon Aug 31 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 29.5 inch low continues to move across Manitoba and into Ontario
tonight, bringing broad 29.9 inch troughing over the Upper Great
Lakes. Weak troughing remains over the lake until ridging of around
29.9 inches builds over the lake on Wednesday and strengthens to
30.0 inches through Friday. Ridging will continue to build to 30.2
inches by Sunday morning as a high pressure center over eastern
Canada moves southward over the weekend.



LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Mon Aug 31 2026 /900 PM CDT Mon Aug 31 2026/

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing south
after midnight, then veering southwest late. Areas of dense fog.
Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon, then veering west late. Waves building
to 1 to 3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight, then backing west late. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Northwest winds less than 10 knots becoming south
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-010800-
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-
1000 PM EDT Mon Aug 31 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Areas of dense
fog. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. Patchy dense
fog through early afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing south by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots veering south. Waves calm
to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Mon Aug 31 2026

.REST OF TONIGHT...West winds 5 to 15 knots backing southwest
late. Areas of dense fog. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Patchy dense fog through early
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots becoming west less
than 10 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds less than 10 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Mon Aug 31 2026

.REST OF TONIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots late. Patchy fog by midnight, then areas of dense
fog after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west late. Patchy
dense fog through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. A slight chance of showers. 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 becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...East winds 15 to 25 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-010800-
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-
1000 PM EDT Mon Aug 31 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots veering west
after midnight, then diminishing to 5 to 15 knots late. Patchy
fog by midnight, then areas of dense fog after midnight. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Areas of dense fog through early afternoon.
Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A slight chance of showers. 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. Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Mon Aug 31 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. Patchy fog by
midnight, then areas of dense fog after midnight. Waves calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then becoming south 10 to 20 knots late. Areas of
dense fog through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A slight chance of showers. 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.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-010800-
MAFOR 0103/
Superior West 11504 11404 11504 11510 12520 12620. Waves 1 foot
or less overnight. Waves 1 to 3 feet Tuesday and Tuesday evening.

Superior North Central 11604 12504 11414 13520 11620. Waves 1 to
3 feet.

Superior South Central 11610 11614 11504 11414 12410 11510 11610.
Waves 2 feet or less.

Superior East 11514 12604 11404 11400 11300 19304 11400 11510.
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