030
FZUS63 KMQT 241401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Fri Apr 24 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...

A 29.4 inch low over northern Lake Winnipeg is sending a 29.6 inch
trough across Lake Superior today. Into Saturday, the parent low
weakens considerably as remnant troughing moves south and 30.0 inch
ridging builds over Lake Superior by late Saturday. This ridge
builds to 30.1 inches by late Sunday and persists into early Monday.
Meanwhile, a 29.3 inch Colorado Low develops, moving towards the
Upper Midwest by early Monday, causing pressure over Lake Superior
to fall rapidly toward 29.7 inches by mid-Monday. Lake Superior
pressure continues to fall as this 29.3 inch low reaches MN/WI by
late Monday and Lake Superior by early Tuesday, causing pressure
over the lake to remain low near 29.3 throughout Tuesday. This low
lifts north into Ontario Wednesday morning, and Lake Superior
pressures increase to 29.8 inches by Wednesday midday.


LSZ162-242000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Fri Apr 24 2026 /901 AM CDT Fri Apr 24 2026/

.REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming southwest 5 to 15 knots
late. A slight chance of rain showers by late morning. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then veering northeast late. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south in the
afternoon, then backing east late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. A slight chance of rain showers after midnight.
Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. Waves building to
2 to 4 feet.
.MONDAY...East winds 20 to 30 knots backing northeast. A chance
of rain showers, then rain showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...West gales to 35 knots diminishing to 15 to 25 knots.
A chance of rain showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.

$$

LSZ263-242000-
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-
1001 AM EDT Fri Apr 24 2026

.REST OF TODAY...West winds 20 to 30 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves 5 to 8 feet
occasionally to 10 feet subsiding to 3 to 5 feet occasionally to
7 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon, then backing south late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots. Waves building to 1 to
3 feet.
.MONDAY...East gales to 35 knots. A chance of rain showers, then
rain showers. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 35 knots. A chance of rain showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet, then
building to 8 to 11 feet occasionally to 14 feet.

$$

LSZ264-242000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Fri Apr 24 2026

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...Southeast gales to 35 knots becoming northwest
10 to 20 knots late. Rain showers likely and a slight chance of
thunderstorms by late morning, then a chance of rain showers by
mid afternoon. Waves 7 to 10 feet occasionally to 13 feet
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then backing northwest late. Waves subsiding to calm to
2 feet.
.SATURDAY...Northwest winds 5 to 15 knots diminishing to less
than 10 knots in the afternoon, then backing south late. Waves
calm to 2 feet.
.SATURDAY NIGHT...East winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East gales to 35 knots becoming southeast gales to
40 knots. A chance of rain showers, then rain showers. Waves
building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. A chance of rain showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ265-242000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Fri Apr 24 2026

.REST OF TODAY...Southeast winds 20 to 30 knots becoming west
15 to 25 knots in the afternoon, then diminishing to 10 to
20 knots late. Rain showers likely and a slight chance of
thunderstorms by late morning, then a chance of rain showers by
mid afternoon. Waves 4 to 7 feet occasionally to 9 feet subsiding
to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming northeast
5 to 15 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Southeast gales to 40 knots. A chance of rain showers,
then rain showers. Waves building to 10 to 14 feet occasionally
to 18 feet, then subsiding to 9 to 12 feet occasionally to
15 feet.
.TUESDAY...West gales to 45 knots. A chance of rain showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet, then
building to 9 to 12 feet occasionally to 15 feet.

$$

LSZ266-242000-
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-
1001 AM EDT Fri Apr 24 2026

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...Southeast gales to 40 knots becoming west 20 to
30 knots late. Rain showers likely by late morning. A slight
chance of thunderstorms. A chance of rain showers by mid
afternoon. Waves 7 to 10 feet occasionally to 13 feet subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 10 to 20 knots. A slight chance of
rain showers through midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Southeast gales to 45 knots. Rain showers likely. Waves
building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...West gales to 45 knots. A chance of rain showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet, then
building to 9 to 12 feet occasionally to 15 feet.

$$

LSZ267-242000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Fri Apr 24 2026

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...Southeast gales to 40 knots diminishing to 15 to
25 knots late. Rain showers likely and a slight chance of
thunderstorms. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering southwest after
midnight, then veering west late. A chance of rain showers
through midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then backing north late. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast gales to 40 knots. Rain showers. Waves
building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 40 knots. Rain showers likely, then a
chance of rain showers. Waves subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ261-242000-
MAFOR 2415/
Superior West 11620 12510 11600 11800 12100 11800. A chance of
rain showers late this morning. Waves 2 to 4 feet this afternoon.
Waves 1 to 3 feet tonight. Waves 1 foot or less Saturday morning.

Superior North Central...GALE WARNING IN EFFECT...11356 11540
11720 11710 12810 11800 11700. Waves 6 to 10 feet subsiding to 5
to 7 feet this afternoon. Waves 3 to 6 feet subsiding to 2 to 3
feet tonight. Waves 1 to 2 feet Saturday morning.

Superior South Central...GALE WARNING IN EFFECT...11446 11620
11720 14710 11710. Waves 3 to 6 feet this afternoon. Waves 2 to 4
feet subsiding to 1 to 2 feet tonight. Waves 1 to 2 feet Saturday
morning.

Superior East...GALE WARNING IN EFFECT...12356 11330 11420 11510
11410 12300. Waves 6 to 9 feet subsiding to 3 to 6 feet this
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet tonight.
Waves 1 to 2 feet Saturday morning.

$$

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