977
FZUS63 KMQT 040801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Fri Sep 4 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 will be in control over the weekend as a 30.0 inch
ridge builds over the lake. The ridge over the lake will gradually
strengthen to 30.1 inches through this weekend as a 29.8 inch low
over southeast Quebec shifts east towards Nova Scotia and deepens to
29.5 inches. Ridging builds to 30.2 inches over the lake by early
next week as high pressure over Hudson Bay strengthens to 30.4
inches. Broad troughing of 29.5 to 29.6 inches will persist over the
Rockies and Northern Plains through the period.



LSZ162-042000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Fri Sep 4 2026 /300 AM CDT Fri Sep 4 2026/

.EARLY THIS MORNING...East winds 15 to 25 knots. Showers likely
and a slight chance of thunderstorms. Waves 2 to 4 feet.
.TODAY...Northeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.MONDAY...East gales to 40 knots. A chance of showers. Showers.
Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...South gales to 35 knots becoming west 20 to 30 knots.
Showers likely. A chance of showers. Waves subsiding to 1 to
3 feet.

$$

LSZ263-042000-
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 Fri Sep 4 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves 2 to 4 feet.
.TODAY...East winds 10 to 20 knots backing northeast late. A
chance of showers. Waves 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.MONDAY...East gales to 35 knots. A chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...South gales to 40 knots. A chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 2 to 4 feet.

$$

LSZ264-042000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Fri Sep 4 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots. A chance of showers. Waves
building to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. Waves subsiding
to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. 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 backing east after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots increasing to gales to
35 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...South gales to 45 knots. Showers, then a chance of
showers. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-042000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Fri Sep 4 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. A slight chance of thunderstorms through early afternoon. A
chance of showers. Waves building to 2 to 4 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.MONDAY...East winds 15 to 25 knots becoming southeast gales to
35 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...South gales to 45 knots. Showers, then a chance of
showers. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 2 to 4 feet.

$$

LSZ266-042000-
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 Fri Sep 4 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
building to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. 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...East winds 15 to 25 knots becoming southeast gales to
35 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...South gales to 40 knots. Showers. Waves building to
8 to 11 feet occasionally to 14 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.

$$

LSZ267-042000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Fri Sep 4 2026

.EARLY THIS MORNING...East winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing northeast late. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing north late. Waves
calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Southeast winds 20 to 30 knots becoming south gales to
35 knots. Showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-041400-
MAFOR 0409/
Superior West 11236 12230 13130 12120. Waves 3 to 5 feet today.
Waves 3 to 5 feet subsiding to 2 to 3 feet tonight.

Superior North Central 14220 11220 11110 12100. A chance of
showers this morning. Waves 1 to 3 feet.

Superior South Central 15220 12210. A chance of showers this
morning. Waves 1 to 3 feet.

Superior East 13210 12110 12100 11210. 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