140
FZUS63 KMQT 140803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Sat Jun 14 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...

A 30.3 inch high pressure south of James Bay is extending 30.2 inch
ridging over Lake Superior this morning. Throughout today and
tonight, the high will weaken and gradually be replaced by another
30.3 inch high moving over northern Ontario, though 30.2 inch
ridging will remain over Lake Superior through Sunday morning.
Through Sunday night, the high pressure shifts towards the Eastern
Seaboard, with ridging over Lake Superior weakening to 30.1 inches.
By Monday morning, a 29.7 inch low will be developing over the
Dakotas, with ridging over Lake Superior weakening to 30.0 inches.
The 29.7 inch low moves over Lake Superior early Tuesday morning,
deepening to 29.4 inches Tuesday night into Wednesday as it moves
from northern Ontario to Quebec. Wednesday into Thursday, another
low moves across the Great Lakes at around 29.6 inches. Weak ridging
of around 30.0 inches then settles over the Lake late Thursday into
Friday.


LSZ162-142000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Sat Jun 14 2025 /302 AM CDT Sat Jun 14 2025/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. A slight
chance of rain showers. Waves 2 to 4 feet subsiding to 1 to
3 feet.
.TODAY...Northeast winds 10 to 20 knots. A slight chance of
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. Showers and a
chance of thunderstorms. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming west 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-142000-
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-
402 AM EDT Sat Jun 14 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast in the
afternoon. A slight chance of showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming west less than
10 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Showers likely and a chance of thunderstorms. Waves
calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing west. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-142000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Sat Jun 14 2025

.EARLY THIS MORNING...East winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast less than
10 knots after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest
less than 10 knots after midnight. A chance of showers. Waves
calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. A chance of showers
through midnight. Showers likely after midnight. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. A chance
of showers. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ265-142000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Sat Jun 14 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots late. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. 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 calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing south. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northwest. A
chance of showers. Waves calm to 2 feet.

$$

LSZ266-142000-
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-
402 AM EDT Sat Jun 14 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast late. A
slight chance of showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. A slight chance of showers. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast in the
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers through
midnight. A chance of thunderstorms. Showers likely after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming northwest 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-142000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Sat Jun 14 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing northeast late. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves calm to
2 feet.
.TUESDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north. A
chance of showers. Waves calm to 2 feet.

$$

LSZ261-141400-
MAFOR 1409/
Superior West 11210 14110 11100 12200. Waves 1 to 3 feet.

Superior North Central 15200 12300. Waves 1 foot or less.

Superior South Central 15200 11200 11300. Waves 1 foot or less.

Superior East 11200 11300 12200 13100 11200. Waves 1 foot 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