078
FZUS63 KMQT 060201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM 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 of 30.1 inches over Lake Superior remains
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 eastern Hudson
Bay, deepening to 29.2 inches by Wednesday afternoon. This sends a
29.7 inch trough over Lake Superior Tuesday night and Wednesday.
Weak ridging of 29.9 inches returns to Lake Superior by the end of
Thursday.



LSZ162-060800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Sat Sep 5 2026 /900 PM CDT Sat Sep 5 2026/

.REST OF TONIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. A slight chance of
showers 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. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming south 20 to
30 knots after midnight. Showers and a slight chance of
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.TUESDAY...South winds 20 to 30 knots veering southwest by mid
afternoon. Showers likely through early afternoon. A chance of
thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West gales to 40 knots. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-060800-
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-
1000 PM EDT Sat Sep 5 2026

.REST OF TONIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots late. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots late. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY...South winds 10 to 20 knots backing east by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. A chance of showers through
midnight, then showers and a slight chance of thunderstorms after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Showers through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Southwest gales to 35 knots becoming west gales
to 40 knots after midnight. Waves 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 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing southwest.
Waves subsiding to calm to 2 feet.

$$

LSZ264-060800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Sat Sep 5 2026

.REST OF TONIGHT...Southeast winds less than 10 knots. Waves calm
to 2 feet.
.SUNDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A slight chance of showers 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 through
midnight, then showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Showers through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 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 9 to 12 feet occasionally to 15 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing southwest.
Waves subsiding to calm to 2 feet.

$$

LSZ265-060800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Sat Sep 5 2026

.REST OF TONIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots late. 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 becoming south
20 to 30 knots after midnight. A slight chance of showers through
midnight, then showers likely after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Showers through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...South gales to 35 knots veering southwest after
midnight. A chance of showers. Waves 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 7 to 10 feet occasionally to 13 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming southwest
10 to 20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-060800-
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-
1000 PM EDT Sat Sep 5 2026

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering
southeast late. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east late. 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 becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots. Showers and a chance of
thunderstorms. Waves building to 5 to 9 feet occasionally to
11 feet.
.TUESDAY NIGHT...South gales to 35 knots veering southwest after
midnight. A chance of showers. Waves subsiding to 4 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...West gales to 45 knots veering northwest. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming southwest
10 to 20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-060800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Sat Sep 5 2026

.REST OF TONIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight, then veering east late. Waves calm
to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.SUNDAY NIGHT...East 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. A chance of
showers after midnight. Waves building to 1 to 3 feet.
.TUESDAY...South winds 20 to 30 knots. Showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. Showers likely through
midnight. A chance of thunderstorms. A chance of showers after
midnight. Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West gales to 40 knots veering northwest. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-060800-
MAFOR 0603/
Superior West 11200 11100 13200 12100 11200. Waves 1 foot or
less.

Superior North Central 16300. Waves 1 foot or less.

Superior South Central 14300 11300 11310 11210 11310. Waves 1
foot or less.

Superior East 12100 12200 12300 11100 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