638
FZUS63 KMQT 230201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Wed Apr 22 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...

30.0 inch high pressure shifts eastward over Lake Superior tonight
while a 29.4 inch low deepens to 29.1 inches over Montana. This low
then moves into southern Manitoba by Thursday evening. This sends
29.6 in troughing over Lake Superior Thursday night into Friday. As
the parent low weakens to 29.9 inches Saturday and remnant troughing
moves south of the Lower Great Lakes at 29.7 inches, 30.0 inch
ridging will build over Lake Superior. By late Sunday, this ridge
builds to 30.1 inches. Meanwhile, a 29.3 inch Colorado Low develops,
moving towards the Upper Midwest by early Monday, causing pressure
over Lake Superior to begin to fall rapidly toward 29.5 by mid-
Monday.


LSZ162-230800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Wed Apr 22 2026 /900 PM CDT Wed Apr 22 2026/

.REST OF TONIGHT...Northeast winds 10 to 20 knots veering east
late. A chance of rain showers and a slight chance of
thunderstorms. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots late. Rain showers likely and a slight chance of
thunderstorms by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots veering east
after midnight, then backing northeast late. Rain 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.
.FRIDAY...West winds 10 to 20 knots. Rain showers likely through
early afternoon, then a chance of rain showers by mid afternoon.
Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. A slight chance of rain showers. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.MONDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ263-230800-
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-
1000 PM EDT Wed Apr 22 2026

.REST OF TONIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of rain showers and a slight chance of
thunderstorms. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of showers and thunderstorms by
mid afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.
.THURSDAY NIGHT...Southeast winds to 30 knots with a few gale
force gusts to 35 knots possible becoming east 20 to 30 knots
after midnight. Rain showers and a chance of thunderstorms. Waves
building to 8 to 11 feet occasionally to 14 feet.
.FRIDAY...East winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. Rain showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of rain
showers by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to 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. Waves building to 1 to
3 feet.
.MONDAY...East winds 15 to 25 knots backing north. 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.

$$

LSZ264-230800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Wed Apr 22 2026

.REST OF TONIGHT...East winds 10 to 20 knots veering southeast
after midnight, then becoming east 15 to 25 knots late. A slight
chance of rain showers after midnight. Waves 1 to 3 feet building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots becoming southeast 20 to
30 knots in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY NIGHT...Southeast winds to 30 knots with a few gale
force gusts to 35 knots possible. A chance of rain showers
through midnight. A chance of thunderstorms. Rain showers likely
after midnight. Waves building to 9 to 12 feet occasionally to
15 feet.
.FRIDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Rain showers and a slight chance of
thunderstorms. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds less than 10 knots backing
southeast after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.MONDAY...East winds 20 to 30 knots veering southeast. A chance
of rain showers. Waves building to 5 to 9 feet occasionally to
11 feet.

$$

LSZ265-230800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Wed Apr 22 2026

.REST OF TONIGHT...Southeast winds 15 to 25 knots. A slight
chance of rain showers after midnight. Waves 1 to 3 feet building
to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible late. Waves
building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...Southeast winds to 30 knots with a few gale
force gusts to 35 knots possible. A chance of showers and
thunderstorms. Waves building to 6 to 9 feet occasionally to
11 feet.
.FRIDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Rain showers and a slight chance of
thunderstorms. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...East winds 20 to 30 knots becoming west gales to
35 knots. 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.

$$

LSZ266-230800-
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-
1000 PM EDT Wed Apr 22 2026

.REST OF TONIGHT...East winds 10 to 20 knots veering southeast
after midnight, then increasing to 15 to 25 knots late. Waves
1 to 3 feet building to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots. Waves building to
6 to 9 feet occasionally to 11 feet.
.THURSDAY NIGHT...Southeast winds to 30 knots with a few gale
force gusts to 35 knots possible. A chance of rain showers and a
slight chance of thunderstorms. Waves building to 8 to 11 feet
occasionally to 14 feet.
.FRIDAY...Southeast gales to 35 knots. A chance of rain showers
through early afternoon. A slight chance of thunderstorms. Rain
showers by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...Southeast gales to 35 knots. A chance of rain showers.
Waves building to 5 to 9 feet occasionally to 11 feet.

$$

LSZ267-230800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Wed Apr 22 2026

.REST OF TONIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots late. Waves calm to 2 feet building to 1 to
3 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 40 knots possible after
midnight. Waves building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY...Southeast gales to 35 knots. A slight chance of rain
showers through early afternoon, then rain showers likely and a
slight chance of thunderstorms by mid afternoon. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.MONDAY...Southeast gales to 35 knots. A chance of rain showers.
Waves building to 5 to 9 feet occasionally to 11 feet.

$$

LSZ261-230800-
MAFOR 2303/
Superior West 14220 11220 11230 11236 11226. A chance of
thunderstorms Thursday evening. Waves 3 to 5 feet overnight.
Waves 2 to 4 feet building to 3 to 6 feet Thursday. Waves 3 to 6
feet Thursday evening.

Superior North Central 11320 11330 11230 14340 11350. A chance of
rain showers and thunderstorms Thursday evening. Waves 2 to 4
feet overnight. Waves 3 to 6 feet building to 5 to 9 feet
Thursday. Waves 7 to 11 feet Thursday evening.

Superior South Central 12320 11330 14340 11340. Waves 2 to 4 feet
overnight. Waves 3 to 6 feet building to 5 to 7 feet Thursday.
Waves 5 to 8 feet Thursday evening.

Superior East 11210 11320 11230 14340 11350. Waves 1 to 3 feet
overnight. Waves 2 to 4 feet building to 4 to 7 feet Thursday.
Waves 5 to 8 feet Thursday evening.

$$

WFO MQT

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weather.gov/mqt/glftable

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