821
FZUS63 KMQT 250801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Fri Sep 25 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 30.4 inch high centered over Quebec will weaken to 30.3 inches
today over the Great Lakes basin as a 29.4 inch low develops over
the northern Rockies. On Saturday the high begins shifting northeast
toward northern Quebec while the low deepens and moves north through
the Canadian Prairies. Sunday through Monday, the high shifts east
to the Canadian Maritimes, weakening to 30.0 inches. This gradually
weakens ridging over Lake Superior from 30.1 inches Sunday morning
to 29.9 inches by late Monday as a 29.8 inch trough approaches from
the west. By Tuesday evening the trough will move over Lake Superior
at around 29.7 inches.



LSZ162-252000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Fri Sep 25 2026 /301 AM CDT Fri Sep 25 2026/

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds less than 10 knots veering north in the
afternoon, then becoming northeast 5 to 15 knots late. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots becoming west 10 to
20 knots. Showers likely, then a chance of showers. Waves calm to
2 feet.

$$

LSZ263-252000-
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 Fri Sep 25 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming northeast 5 to 15 knots
late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers after midnight. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.TUESDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. Showers likely. Waves calm to 2 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Fri Sep 25 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then backing east late. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds less than 10 knots becoming south 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers, then
showers likely. Waves building to 1 to 3 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Fri Sep 25 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 15 to 25 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
Waves calm to 2 feet.
.TUESDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely. Waves building to 1 to 3 feet.

$$

LSZ266-252000-
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 Fri Sep 25 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming northeast 5 to 15 knots
late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then backing east late. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots diminishing to less than
10 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots becoming south 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.TUESDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely. Waves building to 2 to 4 feet.

$$

LSZ267-252000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Fri Sep 25 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then backing northeast late. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then backing north late. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming west less than
10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming south 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Showers likely. Waves building to 1 to 3 feet.

$$

LSZ261-251400-
MAFOR 2509/
Superior West 13500 11800 11100 12200 11100. Waves 1 foot or
less.

Superior North Central 13500 11600 11400 13300. Waves 2 feet or
less.

Superior South Central 13500 13200 12300. Waves 1 foot or less.

Superior East 14400 12100 12200. 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