017
FZUS63 KMQT 261948
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
348 PM EDT Sat Apr 26 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 30.3 inch high remains stationary over the Upper
Great Lakes into Sunday before shifting into the Lower Great Lakes
Sunday evening as a low pressure of 29.7 inches clips the Hudson
Bay shores and a 29.5 inch low organizes over the Northern Plains.
Monday night, the Northern Plains low reaches Lake Superior,
deepening to at least 29.4 inches before departing to Quebec by
Tuesday. High pressure of around 30.2 inches follows on Wednesday
before troughing of around 29.8 inches returns on Thursday.

LSZ162-270400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
348 PM EDT Sat Apr 26 2025 /248 PM CDT Sat Apr 26 2025/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then backing southeast late. A chance of rain showers.
A slight chance of thunderstorms after midnight. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Rain showers and a
chance of thunderstorms. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering northwest
after midnight. A chance of thunderstorms through midnight. Rain
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TUESDAY...North winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ263-270400-
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-
348 PM EDT Sat Apr 26 2025

...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing southeast after
midnight, then veering south late. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A slight chance of
rain showers. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. Rain showers and a chance of
thunderstorms. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming north gales
to 35 knots after midnight. A chance of thunderstorms through
midnight. Rain showers. A chance of snow showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North gales to 35 knots diminishing to 15 to 25 knots
by mid afternoon. A chance of rain showers through early
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ264-270400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
348 PM EDT Sat Apr 26 2025

...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south late.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast late. A
slight chance of rain showers by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of rain showers. Waves building to
2 to 4 feet.
.MONDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon, then rain showers and a slight chance of thunderstorms
by mid afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming northwest
gales to 35 knots after midnight. Rain showers and a chance of
thunderstorms through midnight, then a chance of rain showers,
possibly mixed with snow after midnight. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ265-270400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
348 PM EDT Sat Apr 26 2025

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots backing southeast
late. A slight chance of rain showers after midnight. Waves
building to 1 to 3 feet.
.MONDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots by mid afternoon. Rain showers likely. A chance of
thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots after midnight. Rain showers and a chance of
thunderstorms through midnight, then a chance of rain showers
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. A chance of rain showers, possibly
mixed with snow. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing north. A chance of
rain showers. Waves calm to 2 feet.

$$

LSZ266-270400-
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-
348 PM EDT Sat Apr 26 2025

...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers through early
afternoon, then rain showers likely and a slight chance of
thunderstorms by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Rain showers through midnight. A chance of
thunderstorms. A chance of rain showers after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest gales to 35 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots backing north. A chance of
rain showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ267-270400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
348 PM EDT Sat Apr 26 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 15 to 25 knots. A chance of rain showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest gales to
35 knots by mid afternoon. A chance of rain showers. Waves
building to 6 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...East winds 10 to 20 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ261-270400-
MAFOR 2621/
Superior West 11400 13200 11300 11400 12410. Waves 1 foot or
less.

Superior North Central 11610 11510 11500 14400 11410. Waves 1
foot or less.

Superior South Central 11700 11500 14400 12310. Waves 2 feet or
less.

Superior East 11720 11710 12600 11500 12400 11300. Waves 1 to 3
feet tonight. Waves 1 foot or less Sunday.

$$

GS

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes