256
FZUS63 KMQT 190801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sat Sep 19 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...

This morning, 30.3 inch high pressure over the Ontario/Quebec line
weakens to 30.2 inches as it moves into western Quebec. Meanwhile,
29.9 inch low pressure develops over the Central Plains, reaching
Iowa late this morning as a 29.8 inch low tracks across Hudson Bay.
Into Sunday, a 30.2 inch high over the Canadian Prairie builds to
30.4 inches as it moves into northwestern Ontario. This high
pressure center slowly builds to 30.5 inches as it shifts into
Quebec by midday Tuesday, trailing a 30.4 inch ridge over Lake
Superior. The high builds further to 30.6 inches Wednesday as it
progresses eastward.



LSZ162-192000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sat Sep 19 2026 /301 AM CDT Sat Sep 19 2026/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...East winds 10 to 20 knots backing northeast in the
afternoon, then veering east late. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight, then becoming northeast 15 to 25 knots late. Waves
building to 1 to 3 feet.
.SUNDAY...Northeast winds 20 to 30 knots veering east late. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-192000-
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-
401 AM EDT Sat Sep 19 2026

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming north 10 to 20 knots
after midnight, then becoming northeast 15 to 25 knots late. A
slight chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-192000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sat Sep 19 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast late. Waves
calm to 2 feet.
.TONIGHT...South winds less than 10 knots becoming north 5 to
15 knots after midnight, then becoming northeast 15 to 25 knots
late. A slight chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-192000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sat Sep 19 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing north after
midnight, then increasing to 15 to 25 knots late. Waves calm to
2 feet.
.SUNDAY...Northeast winds to 30 knots with a few gale force gusts
to 35 knots possible diminishing to 20 to 30 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots becoming east
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ266-192000-
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-
401 AM EDT Sat Sep 19 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots backing southeast in the
afternoon, then becoming east 5 to 15 knots late. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing north after
midnight, then increasing to 15 to 25 knots late. A slight chance
of showers after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-192000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sat Sep 19 2026

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 10 to 20 knots backing east late. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 15 to 25 knots backing north late.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-191400-
MAFOR 1909/
Superior West 11310 12210 11110 11210 11100 11800 11820. Waves 2
feet or less.

Superior North Central 13410 11310 11300 11400 11700 11820. Waves
2 feet or less.

Superior South Central 11420 14320 11310 11200 11820. Waves 1 to
2 feet.

Superior East 12410 11310 11300 11200 11300 11200 11810. 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