499
FZUS63 KMQT 101401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Thu Sep 10 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...

30.0 inch ridging builds over the lake today, allowing calmer
conditions until Friday morning. A trough averaging 29.5 inches
tracks from the Great Plains north toward Hudson Bay by Friday
afternoon, bringing 29.8 inch troughing to the lake. A cold front
and 29.7 inch trough passes through on Saturday with ridging in its
wake reaching 30.0 inches by Sunday. This strengthens further to
30.2 inches Monday.



LSZ162-102000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Thu Sep 10 2026 /901 AM CDT Thu Sep 10 2026/

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 20 to 30 knots backing south late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming east 15 to 25 knots.
A chance of showers. Waves building to 1 to 3 feet.
.MONDAY...East gales to 35 knots veering west. Showers likely,
then a chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ263-102000-
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 Thu Sep 10 2026

.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
in the afternoon, then becoming south 10 to 20 knots late. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
after midnight, then becoming southwest 20 to 30 knots late.
Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots. A slight chance of
showers by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 20 to 30 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots becoming east 15 to 25 knots.
A chance of showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.MONDAY...East gales to 35 knots becoming west gales to 40 knots.
Showers likely. Waves building to 6 to 9 feet occasionally to
11 feet.

$$

LSZ264-102000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Thu Sep 10 2026

.REST OF TODAY...Northwest winds less than 10 knots becoming west
5 to 15 knots in the afternoon, then backing southwest late.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming south 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A chance of showers
through midnight. A chance of thunderstorms. Showers after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast gales to 35 knots becoming west gales to
40 knots. A chance of showers, then showers likely. Waves
building to 6 to 10 feet occasionally to 13 feet.

$$

LSZ265-102000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Thu Sep 10 2026

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing southeast late.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
after midnight, then veering southwest late. Waves calm to
2 feet.
.FRIDAY...Southwest winds 20 to 30 knots backing south in the
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. Showers likely and a
slight chance of thunderstorms after midnight. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY...West gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. A slight chance of showers through early
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots. Waves 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...Southeast gales to 40 knots becoming west gales to
45 knots. Showers likely. Waves building to 5 to 9 feet
occasionally to 11 feet.

$$

LSZ266-102000-
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 Thu Sep 10 2026

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing west late. Waves
3 to 5 feet occasionally to 7 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 4 to
7 feet occasionally to 9 feet.
.SATURDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. A chance of showers through early afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots veering northwest
after midnight. Waves 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast gales to 40 knots becoming south gales to
45 knots. A chance of showers. Waves building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ267-102000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Thu Sep 10 2026

.REST OF TODAY...Northwest winds 10 to 20 knots becoming west
5 to 15 knots late. Waves 3 to 6 feet occasionally to 8 feet
subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 10 to 20 knots late. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. A slight chance of
showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots becoming south gales to
40 knots. A chance of showers, then showers and a chance of
thunderstorms. Waves building to 8 to 11 feet occasionally to
14 feet.

$$

LSZ261-102000-
MAFOR 1015/
Superior West 11500 12400 11410 11420 12530 11540. Waves 1 foot
or less this afternoon. Waves 1 to 3 feet tonight. Waves 1 to 3
feet building to 2 to 4 feet Friday morning.

Superior North Central 11700 11600 11510 12410 11420 11530 11540.
Waves 1 to 3 feet this afternoon and tonight. Waves 2 to 4 feet
building to 3 to 5 feet Friday morning.

Superior South Central 11710 11700 11100 11410 11420 11430 11530
11540. Waves 1 to 3 feet this afternoon and tonight. Waves 2 to 4
feet Friday morning.

Superior East 12710 11610 11500 11410 11420 12430. Waves 3 to 5
feet subsiding to 2 to 3 feet this afternoon. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet Friday morning.

$$

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