268
FZUS63 KMQT 240201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM 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 over the St. Lawrence Seaway is extending a
30.2 inch ridge over Lake Superior the rest of tonight. 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. A 29.9 inch low over the Northern
Plains early Wednesday morning then moves through western Lake
Superior throughout the day on Wednesday.



LSZ162-240800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Fri Oct 23 2026 /900 PM CDT Fri Oct 23 2026/

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

$$

LSZ263-240800-
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 Fri Oct 23 2026

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Patchy dense fog. A slight chance of
showers after midnight. Waves calm to 2 feet building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots late. A 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, then diminishing to 5 to 15 knots
late. A chance of showers through midnight. Waves subsiding to
1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots. Waves building to 2 to
4 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 by mid
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 5 to 15 knots veering southeast. A chance
of rain showers. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest gales
to 35 knots. A chance of rain showers. Waves building to 4 to
7 feet occasionally to 9 feet.

$$

LSZ264-240800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Fri Oct 23 2026

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of showers after midnight. Waves
1 to 3 feet 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 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, then diminishing to 5 to 15 knots late. A chance
of showers through midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves subsiding to 1 to 3 feet, then building
to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots. 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...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest gales
to 35 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ265-240800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Fri Oct 23 2026

.REST OF TONIGHT...South winds 15 to 25 knots. Waves 1 to 3 feet.
.SATURDAY...South winds 20 to 30 knots. 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, then veering west late. A slight
chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. A slight chance of showers
through early afternoon. Waves building 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. 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...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming southwest gales
to 35 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ266-240800-
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 Fri Oct 23 2026

.REST OF TONIGHT...South winds 15 to 25 knots. Patchy fog after
midnight. Waves 2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots. Waves building to 4 to
8 feet occasionally to 10 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight, then veering west late. A chance
of showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. 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. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ267-240800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Fri Oct 23 2026

.REST OF TONIGHT...South winds 15 to 25 knots. Patchy fog 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 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots late. A chance of showers. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...North winds 10 to 20 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-240800-
MAFOR 2403/
Superior West 11310 11310 19314 11320 13420 11520 11620. A chance
of showers Saturday afternoon and Saturday evening. Waves 1 to 2
feet overnight. Waves 1 to 3 feet building to 2 to 4 feet
Saturday. Waves 2 to 3 feet Saturday evening.

Superior North Central 11410 12420 11430 12440 11430 11520. A
chance of showers Saturday evening. Waves 1 to 3 feet overnight.
Waves 2 to 4 feet building to 4 to 7 feet Saturday. Waves 4 to 7
feet subsiding to 3 to 5 feet Saturday evening.

Superior South Central 13430 14440 11440. Waves 1 to 3 feet
overnight. Waves 2 to 4 feet building to 3 to 6 feet Saturday.
Waves 3 to 6 feet Saturday evening.

Superior East 13420 13430 12440. Waves 2 to 3 feet overnight.
Waves 2 to 4 feet building to 3 to 5 feet Saturday. Waves 4 to 7
feet Saturday 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