900
FZUS63 KMQT 150802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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...

This morning, a 30.2 inch high extends from Lake Superior to
southern Hudson Bay, weakening to 30.1 inches as it moves over the
Ontario/Quebec line. By Monday morning, a 29.8 inch low will be
developing over the Dakotas, deepening to 29.7 inches as it moves
over Lake Superior early Tuesday morning. The low further deepens to
29.4 inches Tuesday evening as it moves from northern Ontario to
Quebec. Wednesday, another low moves across the Great Lakes at
around 29.7 inches. Thursday, as the low deepens to 29.6 inches over
Lake Ontario, a 30.0 inch ridge moves over northern Ontario,
reaching James Bay by Friday morning.
.


LSZ162-152000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sun Jun 15 2025 /301 AM CDT Sun Jun 15 2025/

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. A chance of showers through
early afternoon, then showers likely and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering west after
midnight. Showers through midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west. A chance
of showers. 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.

$$

LSZ263-152000-
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 Sun Jun 15 2025

.EARLY THIS MORNING...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast in the
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming southwest less than 10 knots late. A
chance of showers. Waves calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots veering west in the
afternoon, then becoming east 5 to 15 knots late. A chance of
showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southwest after
midnight. Showers and a chance of thunderstorms. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest 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...Southwest winds 5 to 15 knots veering west. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-152000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sun Jun 15 2025

.EARLY THIS MORNING...East winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...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...South winds less than 10 knots becoming southeast 5 to
15 knots late. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Showers and a chance of thunderstorms. Waves building
to 1 to 3 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...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ265-152000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sun Jun 15 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late. A
chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers and a chance of thunderstorms. Waves calm
to 2 feet.
.TUESDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-152000-
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 Sun Jun 15 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
A slight chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast late. A
chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers and a chance of thunderstorms. Waves
building to 1 to 3 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. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming south 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-152000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sun Jun 15 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. 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 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 after midnight. Waves building to 1 to
3 feet.
.TUESDAY...South winds 10 to 20 knots veering west by mid
afternoon. Showers likely and a chance of thunderstorms through
early afternoon, then a chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ261-151400-
MAFOR 1509/
Superior West 13100 12110 13100. Waves 1 to 2 feet.

Superior North Central 13200 11300 11210 12300 11400. Waves 1
foot or less.

Superior South Central 11200 11100 13200 12310 11400. Waves 1
foot or less.

Superior East 13100 12800 11200 11300 11400. 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