194
FZUS63 KMQT 200201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Sat Sep 19 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...

Weak 30.0 inch troughing currently extending across Ontario, just
west of Lake Superior, crosses the lake this evening through the
first half of tonight. Into Sunday, a 30.2 inch high over the
Canadian Prairie builds to 30.4 inches as it moves into northwestern
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.



LSZ162-200800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sat Sep 19 2026 /901 PM CDT Sat Sep 19 2026/

.REST OF TONIGHT...North winds 5 to 15 knots becoming northeast
15 to 25 knots late. A slight chance of showers after midnight.
Waves calm to 2 feet building to 1 to 3 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering east late. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 2 to 4 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 15 to 25 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...East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.

$$

LSZ263-200800-
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 PM EDT Sat Sep 19 2026

.REST OF TONIGHT...North winds less than 10 knots increasing to
10 to 20 knots after midnight, then becoming northeast 15 to
25 knots late. A slight chance of showers. Waves calm to 2 feet
building to 2 to 4 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots becoming east 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. Waves 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...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east. Waves
calm to 2 feet.

$$

LSZ264-200800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Sat Sep 19 2026

.REST OF TONIGHT...West winds less than 10 knots becoming north
10 to 20 knots after midnight, then becoming northeast 15 to
25 knots late. A slight chance of showers. Waves calm to 2 feet
building to 2 to 4 feet.
.SUNDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...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. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

$$

LSZ265-200800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Sat Sep 19 2026

.REST OF TONIGHT...South winds 5 to 15 knots backing north after
midnight, then increasing to 15 to 25 knots late. A slight chance
of showers after midnight. Waves calm to 2 feet building to 1 to
3 feet.
.SUNDAY...Northeast winds to 30 knots with a few gale force gusts
to 35 knots possible diminishing to 20 to 30 knots late. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. 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 15 to 25 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 15 to 25 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.

$$

LSZ266-200800-
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 PM EDT Sat Sep 19 2026

.REST OF TONIGHT...South winds 5 to 15 knots backing north after
midnight, then increasing to 15 to 25 knots late. A slight chance
of showers. Waves calm to 2 feet building to 1 to 3 feet.
.SUNDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...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, then building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves 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 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-200800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Sat Sep 19 2026

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing north
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 15 to 25 knots backing north late.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...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 5 to 15 knots backing northeast by mid
afternoon. 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 5 to 15 knots becoming southeast
10 to 20 knots 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 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-200800-
MAFOR 2003/
Superior West 11800 11820 11130 12140 11130 11230 11220. Waves 2
feet or less overnight. Waves 2 to 4 feet building to 3 to 6 feet
Sunday. Waves 2 to 4 feet Sunday evening.

Superior North Central 11700 11820 14130 11120 11110. A chance of
showers late this evening. Waves 2 feet or less overnight. Waves
2 to 4 feet building to 3 to 5 feet Sunday. Waves 1 to 3 feet
Sunday evening.

Superior South Central 11100 11810 11830 13140 11830 11130. Waves
around 1 foot overnight. Waves 2 to 4 feet building to 4 to 6
feet Sunday. Waves 3 to 5 feet Sunday evening.

Superior East 11200 11810 11820 12130 11120 11820 11120. Waves 1
foot or less overnight. Waves 1 to 3 feet building to 3 to 6 feet
Sunday. Waves 2 to 4 feet Sunday evening.

$$

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