227
FZUS63 KMQT 231401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Fri Oct 23 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...

30.5 inch high pressure extending from southern Quebec into New
England is extending a 30.2 inch ridge over Lake Superior. By
Saturday afternoon, a 29.2 inch low over northern Manitoba drags a
30.1 inch trough over the west half of Lake Superior. The trough
remains over the lake until Saturday night. High pressure of at
least 30.6 inches over the Canadian Prairies on Sunday and Monday
pushes ridging of at least 30.4 inches over the Upper Great Lakes on
Sunday. The ridging intensifies to 30.6 inches Monday night into
Tuesday morning as the high`s center moves overhead. The high
retreats east into New England by Wednesday morning.



LSZ162-232000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Fri Oct 23 2026 /900 AM CDT Fri Oct 23 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS
MORNING...

.REST OF TODAY...East winds 5 to 15 knots. Areas of dense fog by
late morning, then patchy fog by mid afternoon. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then increasing to 10 to 20 knots late. Patchy fog through
midnight. A slight chance of showers. Waves building to 1 to
3 feet.
.SATURDAY...South winds 15 to 25 knots veering southwest late. A
chance of showers by mid afternoon. Waves building to 2 to
4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. A chance of showers
through midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 1 to 3 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. A chance
of rain showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

$$

LSZ263-232000-
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 Fri Oct 23 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.REST OF TODAY...South winds 5 to 15 knots backing east late.
Patchy fog by late morning. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A slight chance of showers after midnight. Waves
building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots veering southwest late. A
slight chance of showers by mid afternoon. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A chance of showers through
midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ264-232000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Fri Oct 23 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.REST OF TODAY...South winds 5 to 15 knots backing southeast
late. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. A slight chance
of showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. A slight chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of showers. Waves subsiding to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots veering northeast. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ265-232000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Fri Oct 23 2026

.REST OF TODAY...South winds 10 to 20 knots backing southeast in
the afternoon. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming west 15 to
25 knots after midnight. A chance of showers. Waves subsiding to
1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots veering northeast. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ266-232000-
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 Fri Oct 23 2026

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog by late morning. Waves 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves building to 2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. A slight chance of showers
through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ267-232000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Fri Oct 23 2026

.REST OF TODAY...South winds 10 to 20 knots backing southeast
late. Patchy fog by late morning. Waves 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots. Waves 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers through
early afternoon. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots veering east. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ261-232000-
MAFOR 2315/
Superior West 11304 12200 12310 11410 12420. A chance of showers
overnight. Waves 2 feet or less this afternoon and tonight. Waves
1 to 3 feet Saturday morning.

Superior North Central 11410 13310 13420 11430. Waves 2 feet or
less this afternoon. Waves 1 to 3 feet tonight. Waves 1 to 3 feet
building to 2 to 4 feet Saturday morning.

Superior South Central 11420 11320 14430 11430 11440. Waves 1 to
3 feet this afternoon and tonight. Waves 2 to 4 feet Saturday
morning.

Superior East 11420 12320 14420 11430. Waves 2 to 4 feet.

$$

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