377
FZUS63 KMQT 192101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EST Wed Nov 19 2025

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...

A 29.8 inch trough moves over the lake on Thursday as a developing
29.7 inch low over northern Manitoba moves into Hudson Bay. A 30.1
inch ridge of high pressure over the Northern Plains and Upper
Midwest on Friday moves over the Great Lakes on Saturday. Another
29.8 inch trough then moves over Lake Superior Saturday night into
Sunday before 30.1 inch high pressure rebuilds over the Great Lakes
early next week.


LSZ162-200900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EST Wed Nov 19 2025 /301 PM CST Wed Nov 19 2025/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A slight
chance of rain showers. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots. A chance of rain
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west. A chance
of rain showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-200900-
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-
401 PM EST Wed Nov 19 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A slight
chance of rain showers. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight. A chance of rain showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west. A chance
of rain showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots by midnight. Waves building to 3 to 6 feet occasionally
to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots becoming southeast 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-200900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EST Wed Nov 19 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A slight
chance of rain showers. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west. Rain
showers likely in the morning, then a chance of rain showers in
the afternoon. Waves 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots by midnight, then increasing to 15 to 25 knots
late. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots backing southeast. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

$$

LSZ265-200900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EST Wed Nov 19 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight. A chance of rain showers. Waves building to
1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then veering west by mid afternoon. A
chance of rain showers. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots. A slight chance of
rain showers in the evening. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of rain and snow
showers in the morning. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. Waves calm to 2 feet.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ266-200900-
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-
401 PM EST Wed Nov 19 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight. A slight chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Rain showers likely in the morning, then a chance of
rain showers in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then diminishing to 15 to 25 knots late. A
chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots. A chance of snow
showers, possibly mixed with rain. Waves building to 4 to 8 feet
occasionally to 10 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. Waves 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. A chance of rain showers. Waves 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ267-200900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EST Wed Nov 19 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots by midnight. A slight chance of rain showers after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots. A chance of rain
showers in the morning, then rain showers likely in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...West winds 20 to 30 knots becoming northwest gales to
35 knots in the afternoon. A chance of rain showers, possibly
mixed with snow. Waves building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots backing south in the
afternoon. Waves 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
rain showers. Waves 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ261-200300-
MAFOR 1922/
Superior West 12520 14530 12630. A chance of rain showers
tonight. A chance of showers Thursday morning. Waves 1 to 3 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet Thursday.

Superior North Central 13520 11530 13536 11630. Waves 1 to 3 feet
building to 3 to 5 feet tonight. Waves 3 to 6 feet Thursday.

Superior South Central 11410 14520 11526 12530. Waves 1 to 3 feet
tonight. Waves 1 to 3 feet building to 2 to 4 feet Thursday.

Superior East 11510 12520 12530 13536. Waves 1 to 3 feet building
to 3 to 5 feet tonight. Waves 3 to 6 feet Thursday.

$$

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