328
FZUS63 KMQT 232001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 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. 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.



LSZ162-240800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Fri Oct 23 2026 /300 PM CDT Fri Oct 23 2026/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots late. Patchy fog. 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 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.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 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 building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest 20 to
30 knots. A chance of showers. Waves building to 2 to 4 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-
400 PM EDT Fri Oct 23 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Patchy dense fog. A slight chance of
showers after midnight. Waves 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 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 northeast by mid
afternoon. Waves 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 3 to
5 feet occasionally to 7 feet.

$$

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

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. 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 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 3 to 5 feet occasionally to 7 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 3 to 5 feet
occasionally to 7 feet.

$$

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

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 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 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 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. A slight chance of showers
through early afternoon. 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. 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 2 to 4 feet,
then subsiding to 1 to 3 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-
400 PM EDT Fri Oct 23 2026

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Patchy fog after midnight. Waves
building to 2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots. 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, 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 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. 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 1 to
3 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet.

$$

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

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 1 to
3 feet.
.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 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots late. A chance of showers. Waves subsiding to 2 to
4 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers. 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 veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ261-240200-
MAFOR 2321/
Superior West 11200 11210 19214 11310 11310 19314 11320 13420.
Waves 2 feet or less tonight. Waves 1 to 3 feet building to 2 to
4 feet Saturday.

Superior North Central 12310 11410 12420 11430 12440. Waves 1 to
3 feet tonight. Waves 1 to 3 feet building to 3 to 6 feet
Saturday.

Superior South Central 14430 11430 13440. Waves 1 to 3 feet
tonight. Waves 2 to 4 feet building to 3 to 6 feet Saturday.

Superior East 11320 14420 13430. Waves 2 to 3 feet tonight. Waves
2 to 4 feet building to 3 to 5 feet Saturday.

$$

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