536
FZUS63 KMQT 190901
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 30.2 inch ridge over Lake Superior this morning weakens to 30.0
inches through this evening as 30.3 inch high pressure over the
Lower Great Lakes shifts east into New England. 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.


LSZ162-192100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EST Wed Nov 19 2025 /301 AM CST Wed Nov 19 2025/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. A slight chance of rain showers in the afternoon. Waves
building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then diminishing to 10 to 20 knots late. A
chance of rain showers in the evening, then rain showers likely
after midnight. 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 in the morning. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. Waves
calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-192100-
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 AM EST Wed Nov 19 2025

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots. A slight chance of rain showers in the afternoon. Waves
building to 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. Rain
showers likely in the morning, then a slight 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. Waves subsiding to
2 to 4 feet, then 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 veering west. Waves
building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ264-192100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EST Wed Nov 19 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of rain showers in the
afternoon. Waves building to 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. Rain
showers 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. Waves subsiding 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 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west. 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.

$$

LSZ265-192100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EST Wed Nov 19 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. 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 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by mid afternoon. Rain showers likely. Waves subsiding
to calm to 2 feet, then 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, then subsiding to 2 to 4 feet.
.FRIDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. Waves calm to 2 feet.

$$

LSZ266-192100-
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 AM EST Wed Nov 19 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots backing southwest by late
morning, then increasing to 10 to 20 knots by mid afternoon.
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 increasing to 20 to
30 knots by late morning, then becoming west 15 to 25 knots by
mid afternoon. Rain showers. 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 after midnight. A chance of rain showers in the evening.
Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 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...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves 2 to 4 feet.

$$

LSZ267-192100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EST Wed Nov 19 2025

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots backing southwest. 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 after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots. Rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots. Rain showers likely
in the evening, then a slight chance of rain showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...West winds 20 to 30 knots veering northwest in the
afternoon. A chance of rain showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves 2 to 4 feet.

$$

LSZ261-191500-
MAFOR 1910/
Superior West 11500 14510 11520 11530 11536. Waves 1 to 3 feet
today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior North Central 11600 11510 14520 12530. A chance of
showers tonight. Waves 1 to 3 feet today. Waves 1 to 3 feet
building to 3 to 5 feet tonight.

Superior South Central 11600 13500 11510 13520. Waves 1 foot or
less today. Waves 1 to 3 feet tonight.

Superior East 11600 14510 12520 11530. Waves 1 to 2 feet today.
Waves 1 to 3 feet building to 2 to 4 feet tonight.

$$

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