463
FZUS63 KMQT 040201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Thu Sep 3 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 ridge extends over Lake Superior from a 30.2 inch high
over Hudson Bay, while 29.7 inch low moves into MN. This will cause
height falls over the western half of the lake tonight, but the
parent low weakens to 29.8 inches by Friday morning. Meanwhile, the
ridge over the lake gradually strengthen to 30.1 inches through this
weekend as a 29.8 inch low over Quebec shifts east towards Nova
Scotia and deepens to 29.5 inches. Ridging builds to 30.2 inches
over the lake by early next week as high pressure over Hudson Bay
strengthens to 30.4 inches. Broad troughing of 29.5 to 29.6 inches
will persist over the Rockies and Northern Plains through the period.



LSZ162-040800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Thu Sep 3 2026 /900 PM CDT Thu Sep 3 2026/

.REST OF TONIGHT...East winds 15 to 25 knots backing northeast
after midnight. A chance of showers and thunderstorms. Waves 2 to
4 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of showers through early
afternoon. Waves 2 to 4 feet.
.FRIDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
5 to 15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. A slight chance
of showers after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...East gales to 35 knots. A chance of showers. A chance
of thunderstorms. Showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...South gales to 35 knots becoming southwest 20 to
30 knots. Showers likely. A chance of showers. Waves subsiding to
1 to 3 feet.

$$

LSZ263-040800-
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 Thu Sep 3 2026

.REST OF TONIGHT...East winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves 2 to 4 feet subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast late. A
slight chance of showers through early afternoon. Waves 2 to
4 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast gales to
35 knots. A chance of showers. Showers likely. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots veering southwest. Showers
likely. A chance of showers. Waves subsiding to 2 to 4 feet.

$$

LSZ264-040800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Thu Sep 3 2026

.REST OF TONIGHT...East winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. A slight chance of showers
after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 10 to 20 knots becoming southeast 20 to
30 knots. A chance of showers. Showers likely. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots.
Showers likely. A chance of showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-040800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Thu Sep 3 2026

.REST OF TONIGHT...East winds 10 to 20 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of showers. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots.
Showers likely. A chance of showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-040800-
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 Thu Sep 3 2026

.REST OF TONIGHT...East winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots.
Showers likely. A chance of showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-040800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Thu Sep 3 2026

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering south. Showers
likely. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-040800-
MAFOR 0403/
Superior West 11230 11236 11230 14130 11130. A chance of
thunderstorms overnight. Waves 2 to 4 feet.

Superior North Central 12200 11210 14220 11210. Waves 2 feet or
less.

Superior South Central 13210 14220 11210. A chance of showers
Friday morning. Waves 1 to 3 feet.

Superior East 11100 11200 13210 11110 12100. 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