164
FZUS63 KMQT 310801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sat Oct 31 2026

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 30.5 inch high pressure over the Lower Great Lakes this morning
will keep ridging of 30.2 inches over Lake Superior through Sunday
as it exits east over the Eastern Seaboard. A 29.4 inch Colorado low
over the Plains on Monday then lifts into Minnesota Monday evening,
eventually passing over western Lake Superior at 29.7 inches on
Tuesday. This low then passes north towards James Bay Tuesday night.
In its wake, high pressure ridging of 30.0 inches builds back over
Lake Superior by late Wednesday.



LSZ162-312000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Oct 31 2026 /300 AM CDT Sat Oct 31 2026/

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming northeast less than
10 knots after midnight, then veering south late. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds less than 10 knots becoming east 5 to
15 knots late. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers through early afternoon,
then showers likely by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves building to 1 to 3 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...West winds 15 to 25 knots veering northwest. Showers
likely. Waves subsiding to 1 to 3 feet.

$$

LSZ263-312000-
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-
400 AM EDT Sat Oct 31 2026

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...South winds less than 10 knots backing east late. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. A chance of showers by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Showers. Waves
building to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots. Showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Rain
showers likely, then a chance of rain showers. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-312000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sat Oct 31 2026

.EARLY THIS MORNING...Southwest winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...Southwest winds less than 10 knots backing southeast
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-312000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sat Oct 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers after midnight.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest in the
afternoon, then backing south late. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots. Showers. Waves
building to 2 to 4 feet.
.TUESDAY...Southeast winds 15 to 25 knots becoming south 20 to
30 knots. Showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.

$$

LSZ266-312000-
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-
400 AM EDT Sat Oct 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of showers
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. A slight chance of showers through
early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots. Showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Southeast winds 15 to 25 knots becoming south gales to
35 knots. Showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...South winds 15 to 25 knots veering southwest. A
chance of showers. Waves subsiding to 2 to 4 feet.

$$

LSZ267-312000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sat Oct 31 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon, then backing southeast late. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of showers
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Showers. Waves building to 2 to
4 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots veering southwest.
Showers likely, then a chance of showers. Waves subsiding to calm
to 2 feet, then building to 2 to 4 feet.

$$

LSZ261-311400-
MAFOR 3109/
Superior West 12400 11300 13200 11300 11400. A chance of showers
tonight. Waves 1 foot or less.

Superior North Central 12500 12400 11300 13400. A chance of
showers overnight. Waves 1 foot or less.

Superior South Central 12500 11400 11300 11310 12420 11410. Waves
2 feet or less.

Superior East 12500 13400 13410. 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