997
FZUS63 KMQT 120801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Thu Jun 12 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...

Throughout this morning, a 30.3 inch high over northern Manitoba
shifts to northern Ontario, extending 30.2 inch ridging over Lake
Superior. The high reaches James Bay by Friday afternoon,
maintaining strength with 30.2 ridging remaining over the lake
through the weekend. Monday, high pressure shifts east of the Great
Lakes while a broad low pressure of 29.7 inches moves over the
Plains, with the low arriving over the Great Lakes late Monday into
early Tuesday morning.


LSZ162-122000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Thu Jun 12 2025 /301 AM CDT Thu Jun 12 2025/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TONIGHT...Northeast winds 10 to 20 knots veering east late. A
chance of showers. Waves 2 to 4 feet.
.FRIDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.

$$

LSZ263-122000-
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 Thu Jun 12 2025

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots. A chance of showers. Waves
subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming east
less than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots veering southwest. A chance
of showers and thunderstorms. Waves calm to 2 feet.

$$

LSZ264-122000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Thu Jun 12 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots veering northeast in the
afternoon, then veering south late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots diminishing to less than
10 knots after midnight. A slight chance of rain showers after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. A chance of showers. Waves calm to
2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-122000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Thu Jun 12 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots veering east late. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight, then veering southeast late. A chance of rain showers
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Showers likely through early afternoon, then a chance of
showers by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-122000-
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 Thu Jun 12 2025

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots backing northwest late. Waves
calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast after
midnight, then veering east late. A chance of rain showers after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ267-122000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Thu Jun 12 2025

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then veering east late. A chance of rain showers after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.

$$

LSZ261-121400-
MAFOR 1209/
Superior West 11210 14110 11110 12210. A chance of showers
overnight. Waves 1 to 3 feet.

Superior North Central 12800 11100 11200 11300 11400 11300 11200.
Waves 2 feet or less.

Superior South Central 12800 12100 11200 11400 11300 11200. Waves
1 foot or less.

Superior East 13800 13700 11800 11100. Waves 1 to 2 feet.

$$

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