757
FZUS63 KMQT 152001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun Jun 15 2025

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...

High pressure ridging over Lake Superior weakens to 30.0 inches by
Monday morning. A 29.8 inch low developing over the Dakotas Monday
morning will press east toward the Great Lakes through the day,
deepening to 29.6 inches over western Lake Superior Monday night.
The low further deepens to 29.4 inches by Tuesday evening as it
moves from northern Ontario to Quebec. Wednesday, another low moves
into the Great Lakes at around 29.7 inches. Thursday morning, this
low deepens to 29.6 inches over southern Ontario while a 30.0 inch
ridge moves over northern Ontario. This high extends ridging into
Lake Superior Thursday afternoon through Friday.


LSZ162-160800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Jun 15 2025 /301 PM CDT Sun Jun 15 2025/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms after midnight. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast late. A
chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then becoming southwest 10 to 20 knots
late. Showers and a chance of thunderstorms. Waves calm to
2 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast. A chance
of showers. A chance of thunderstorms. Showers likely. Waves calm
to 2 feet.

$$

LSZ263-160800-
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 PM EDT Sun Jun 15 2025

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots diminishing to less than
10 knots after midnight, then backing northeast late. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots increasing to 5 to
15 knots late. A chance of showers. A chance of thunderstorms by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south after
midnight, then veering west late. Showers likely and a chance of
thunderstorms. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering southeast. A
chance of showers. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. A chance of thunderstorms. Showers likely. Waves calm
to 2 feet.

$$

LSZ264-160800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Jun 15 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late. A
slight chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon. A chance of showers. A chance of
thunderstorms by mid afternoon. Patchy fog by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Showers and a chance of thunderstorms. Waves building
to 2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ265-160800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Jun 15 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late. A
slight chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. A chance of showers. A chance of thunderstorms by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers likely and a chance of thunderstorms.
Waves building to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots. A slight chance of
thunderstorms through early afternoon. A slight chance of
showers. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots veering south. Waves calm
to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers, then showers likely and a chance of thunderstorms.
Waves calm to 2 feet.

$$

LSZ266-160800-
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 PM EDT Sun Jun 15 2025

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. A slight
chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then increasing to 15 to 25 knots late. Showers
likely and a chance of thunderstorms. Waves building to 2 to
4 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A chance of thunderstorms through early
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers, then showers likely. Waves
building to 1 to 3 feet.

$$

LSZ267-160800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Jun 15 2025

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. A chance of thunderstorms. Showers
likely after midnight. Waves building to 2 to 4 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of thunderstorms through early afternoon. A
chance of showers. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north. A
chance of showers. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers, then showers likely. Waves building to 1 to 3 feet.

$$

LSZ261-160200-
MAFOR 1521/
Superior West 11110 14100 11100 11200 11100. A chance of showers
overnight. A chance of showers Monday morning, then a chance of
showers and thunderstorms Monday afternoon. Waves 2 feet or less.

Superior North Central 14300 12400 12300. A chance of showers
Monday morning. Waves 1 foot or less.

Superior South Central 11210 13300 11400 13300. A chance of
showers Monday morning. Waves 1 foot or less.

Superior East 11800 11200 12300 11400 13300. 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