386
FZUS63 KMQT 230801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Tue Jun 23 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 30.2 inch high over Lake Superior this morning remains until this
evening. Tonight through Wednesday, expect a 29.9 inch Clipper low
to dig through the Northern Plains and Upper Midwest, before moving
through Lower Michigan towards the St. Lawrence Seaway on Thursday.
As the Clipper leaves the Upper Midwest, expect weak 30.0 inch
ridging to return to Lake Superior on Thursday, building to 30.1
inches by Friday morning and remaining that way into Saturday as a
29.5 inch low begins to lift off of the Northern Rockies.



LSZ162-232000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Tue Jun 23 2026 /300 AM CDT Tue Jun 23 2026/

.EARLY THIS MORNING...North winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...North winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then increasing to 10 to 20 knots late. A chance of
rain showers through midnight. A slight chance of thunderstorms.
Rain showers likely after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A slight chance of rain showers.
Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east. A chance
of rain showers. Waves building to 1 to 3 feet.

$$

LSZ263-232000-
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-
400 AM EDT Tue Jun 23 2026

.EARLY THIS MORNING...West winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...South winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing northeast late. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A chance of rain showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A slight chance of rain showers.
Waves calm to 2 feet.
.THURSDAY...North winds less than 10 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.

$$

LSZ264-232000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Tue Jun 23 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds less than 10 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds less than 10 knots increasing to 5 to
15 knots late. A slight chance of rain showers after midnight.
Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...North winds less than 10 knots backing west by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY...North winds less than 10 knots veering east. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ265-232000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Tue Jun 23 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east in the
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots backing west 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 veering southeast. Waves
calm to 2 feet.

$$

LSZ266-232000-
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-
400 AM EDT Tue Jun 23 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A chance of rain showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ267-232000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Tue Jun 23 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then veering northwest late. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots diminishing to less than
10 knots after midnight, then backing southwest late. Waves calm
to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing northeast late. A
chance of rain showers by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ261-231400-
MAFOR 2309/
Superior West 12700 14200 11200 11210. A chance of showers
overnight. Waves 1 foot or less.

Superior North Central 12700 12600 11500 11400 12300. Waves 1
foot or less.

Superior South Central 11710 12700 11100 11200 13300. Waves 1
foot or less.

Superior East 11800 12700 11600 12700 11600 11500. 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