381
FZUS63 KMQT 061401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Sun Sep 6 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...

Ridging of 30.1 inches persists over Lake Superior through tonight
and then briefly builds to 30.2 inches on Monday as 30.4 inch high
pressure passes eastward over far northern Ontario. Meanwhile, a
29.6 inch low develops off the northern Rockies by Monday morning
and then tracks northeast to Hudson Bay, deepening to 29.2 inches by
Wednesday afternoon. This sends a 29.6 to 29.7 inch trough over Lake
Superior Tuesday night and Wednesday. Weak ridging of 29.9 inches
returns over the lake on Thursday, followed by another trough
ranging from 29.5 to 29.7 inches on Friday.



LSZ162-062000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Sun Sep 6 2026 /900 AM CDT Sun Sep 6 2026/

.REST OF TODAY...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. A slight chance of showers
after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
late. A slight chance of showers. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots becoming south gales to
35 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers 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 likely and a slight chance of
thunderstorms through early afternoon. Waves 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 diminishing to 20 to
30 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. Waves calm to 2 feet.

$$

LSZ263-062000-
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 AM EDT Sun Sep 6 2026

.REST OF TODAY...East winds less than 10 knots increasing to 5 to
15 knots late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots becoming south gales to
35 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 slight
chance of thunderstorms. A slight chance of showers by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ264-062000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Sun Sep 6 2026

.REST OF TODAY...Southeast winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. A chance of showers. Waves building to 2 to 4 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 after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY...South winds 20 to 30 knots. Showers and a slight
chance of thunderstorms through early afternoon, then a chance of
showers by mid afternoon. Waves building to 4 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. A chance of showers. 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. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ265-062000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Sun Sep 6 2026

.REST OF TODAY...Southeast winds 5 to 15 knots becoming east
10 to 20 knots late. Waves calm to 2 feet.
.TONIGHT...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 backing southeast in the
afternoon, then becoming east 15 to 25 knots late. A slight
chance of showers through early afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. Showers likely after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...South gales to 35 knots. Showers through early
afternoon. A slight 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...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...West gales to 45 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 south 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-062000-
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 AM EDT Sun Sep 6 2026

.REST OF TODAY...Southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing east late. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots late. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon, then becoming east 15 to 25 knots
late. A slight chance of showers. 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 after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...South gales to 35 knots. Showers and a slight chance
of thunderstorms. Waves building to 4 to 8 feet occasionally to
10 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, then building to 4 to 7 feet occasionally
to 9 feet.
.WEDNESDAY...West gales to 45 knots. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-062000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Sun Sep 6 2026

.REST OF TODAY...Southeast winds less than 10 knots backing
northeast late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A chance of showers after midnight.
Waves building to 1 to 3 feet.
.TUESDAY...Southeast winds 20 to 30 knots veering south by mid
afternoon. Showers. A slight chance of thunderstorms by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers 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. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-062000-
MAFOR 0615/
Superior West 11200 12100 11200 12100 12300. Waves 1 foot or
less.

Superior North Central 15300 11300 11210. Waves 1 foot or less.

Superior South Central 11300 11310 11210 12310 13410. Waves 1
foot or less.

Superior East 12300 11100 11200 12300 12400. 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