418
FZUS63 KMQT 130803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Fri Jun 13 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...

30.3 inch high pressure over northern Ontario is extending 30.2 inch
ridging over Lake Superior. The high reaches western Quebec by
Saturday morning, maintaining strength with 30.2 ridging remaining
over the lake into the weekend. The ridge weakens to 30.1 inches
Sunday. On 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 Tuesday into Wednesday.


LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Fri Jun 13 2025 /302 AM CDT Fri Jun 13 2025/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. A chance of
rain showers. Waves 2 to 4 feet.
.TODAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots veering east after
midnight. A chance of showers. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast in the
afternoon. A chance of showers. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing west after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast. A
chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms. Showers likely. Waves calm to 2 feet.

$$

LSZ263-132000-
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 Fri Jun 13 2025

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

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 AM EDT Fri Jun 13 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. A chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Fri Jun 13 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. A 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.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Showers likely. Waves calm to 2 feet.

$$

LSZ266-132000-
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 Fri Jun 13 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. A 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.
.SATURDAY...East winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of showers. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing east. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 AM EDT Fri Jun 13 2025

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of showers
through midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers. Waves calm
to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots backing east. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering south. A chance of
showers. Showers likely. Waves calm to 2 feet.

$$

LSZ261-131400-
MAFOR 1309/
Superior West 11110 11210 14110 12210. A chance of showers today.
Waves 1 to 3 feet.

Superior North Central 12200 12210 14200. Waves 1 foot or less.

Superior South Central 16200. A chance of showers today and this
evening. Waves 1 foot or less.

Superior East 14200 11200 12100 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