083
FZUS63 KMQT 050801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sat Sep 5 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...

High pressure ridging builds to 30.1 inches over Lake Superior by
this afternoon, remaining through Sunday night. The ridge briefly
builds further to 30.2 inches on Monday as a 30.4 inch high passes
eastward over far northern Ontario. Meanwhile, a 29.6 inch low
develops off the northern Rockies. The low then tracks northeast to
James Bay, deepening to 29.3 inches by Wednesday afternoon. This
sends a 29.7 inch trough over Lake Superior Tuesday night and
Wednesday.



LSZ162-052000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Sat Sep 5 2026 /300 AM CDT Sat Sep 5 2026/

.EARLY THIS MORNING...Northeast winds 10 to 20 knots. Patchy fog.
A slight chance of showers. Waves 1 to 3 feet subsiding to calm
to 2 feet.
.TODAY...Northeast winds 10 to 20 knots. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 20 to 30 knots veering south after
midnight. Showers and a chance of thunderstorms. Waves building
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South winds 20 to 30 knots becoming west gales to
35 knots. Showers likely. A chance of thunderstorms. A chance of
showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet.

$$

LSZ263-052000-
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 Sep 5 2026

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy dense fog through early afternoon. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast less than
10 knots late. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming east 5 to 15 knots late.
Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots becoming south
gales to 35 knots after midnight. A chance of showers through
midnight, then showers after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots becoming southwest gales to
40 knots. A chance of showers and thunderstorms. Waves subsiding
to 3 to 5 feet occasionally to 7 feet, then building to 5 to
8 feet occasionally to 10 feet.
.WEDNESDAY...West gales to 45 knots becoming northwest gales to
40 knots. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 2 to 4 feet.

$$

LSZ264-052000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Sat Sep 5 2026

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots. Patchy fog. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight. Patchy fog. Waves calm to 2 feet.
.SUNDAY...Southeast winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of showers through
midnight, then showers likely after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots becoming southwest gales to
40 knots. Showers. A chance of thunderstorms. A chance of
showers. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 45 knots becoming northwest gales to
40 knots. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 2 to 4 feet.

$$

LSZ265-052000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Sat Sep 5 2026

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Showers likely after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 40 knots veering southwest. Showers. A
chance of thunderstorms. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West gales to 45 knots becoming northwest gales to
40 knots. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-052000-
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 Sep 5 2026

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing northeast late. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming east less than
10 knots after midnight, then becoming southeast 5 to 15 knots
late. Patchy fog after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing east late. Patchy dense
fog through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots increasing to
gales to 35 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 40 knots. Showers. A chance of showers.
Waves building to 4 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West gales to 45 knots becoming northwest gales to
40 knots. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-052000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Sat Sep 5 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing north late. Waves calm
to 2 feet.
.TONIGHT...North winds 10 to 20 knots becoming east 5 to 15 knots
after midnight, then veering southeast late. Patchy fog after
midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming northeast 5 to 15 knots
late. Patchy fog through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.TUESDAY...South winds 20 to 30 knots. Showers. A chance of
thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.

$$

LSZ261-051400-
MAFOR 0509/
Superior West 15110 11210 11200. Waves 1 to 3 feet.

Superior North Central 11100 14200 13300. Waves 1 foot or less.

Superior South Central 11100 13200 11210 13200. Waves 1 foot or
less.

Superior East 12210 12100 12800 11100 11200. Waves 2 feet 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