905
FZUS63 KMQT 151401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 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...

High pressure ridging over Lake Superior today weakens to 30.1
inches. 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 at least Friday night.


LSZ162-152000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sun Jun 15 2025 /901 AM CDT Sun Jun 15 2025/

.REST OF 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-
1001 AM EDT Sun Jun 15 2025

.REST OF TODAY...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming east less than
10 knots after midnight, then veering southwest 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. A slight chance of showers and thunderstorms. 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-
1001 AM EDT Sun Jun 15 2025

.REST OF TODAY...East winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon. 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. A slight chance of showers
and thunderstorms. 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-
1001 AM EDT Sun Jun 15 2025

.REST OF 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 slight chance of
thunderstorms through early afternoon. 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-
1001 AM EDT Sun Jun 15 2025

.REST OF TODAY...Northeast 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 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-
1001 AM EDT Sun Jun 15 2025

.REST OF TODAY...North 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 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.

$$

LSZ261-152000-
MAFOR 1515/
Superior West 12100 11110 14100 11400. Waves 1 foot or less.

Superior North Central 11200 14300 13400. A chance of showers
Monday morning. Waves 1 foot or less.

Superior South Central 13200 12300 13400. A chance of showers
Monday morning. Waves 1 foot or less.

Superior East 11100 12800 11200 11300 13400. 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