887
FZUS63 KMQT 201401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Sun Sep 20 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...

Today and Monday, a 30.2 inch high over Manitoba builds to 30.4
inches as it moves over Ontario. This high pressure center slowly
builds to 30.5 inches as it shifts into Quebec by midday Tuesday,
trailing a 30.4 inch ridge over Lake Superior. The high builds
further to 30.6 inches Wednesday as it progresses eastward. The
high, still over southern Quebec, weakens to 30.4 inches Thursday.
By late Friday, the high weakens to 30.3 inches over the eastern
Great Lakes basin as 29.5 inch low pressure develops over Montana.



LSZ162-202000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Sun Sep 20 2026 /901 AM CDT Sun Sep 20 2026/

.REST OF TODAY...Northeast winds 20 to 30 knots becoming east
15 to 25 knots late. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...East winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ263-202000-
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-
1001 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.MONDAY NIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-202000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-202000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots late. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots veering east after
midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
5 to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots veering south. Waves calm
to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ266-202000-
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-
1001 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots in the afternoon, then backing north late. Waves
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming east 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves subsiding to 2 to 4 feet.
.MONDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ267-202000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Sun Sep 20 2026

.REST OF TODAY...Northeast winds 15 to 25 knots backing north
late. Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to
4 feet.
.TONIGHT...Northeast winds 15 to 25 knots veering east after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then becoming northeast 10 to 20 knots late.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ261-202000-
MAFOR 2015/
Superior West 11140 11130 12220 14210. Waves 3 to 6 feet this
afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight.
Waves 2 to 3 feet Monday morning.

Superior North Central 12130 11120 12110 11220 12210. Waves 3 to
5 feet this afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet
tonight. Waves 2 to 3 feet Monday morning.

Superior South Central 11140 12130 12120 13220. Waves 3 to 5 feet
this afternoon and tonight. Waves 2 to 4 feet Monday morning.

Superior East 11130 11830 11820 12120 11220 12210. Waves 3 to 5
feet subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet
tonight and Monday morning.

$$

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