408
FZUS63 KMQT 221401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM 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 remains over Lake Superior today. Meanwhile,
a 29.4 inch low over Montana deepens to 29.1 inches by this evening
before moving 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.


LSZ162-222000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Wed Apr 22 2026 /900 AM CDT Wed Apr 22 2026/

.REST OF TODAY...East winds 5 to 15 knots backing northeast in
the afternoon, then increasing to 10 to 20 knots late. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots veering east late. A
slight chance of showers and thunderstorms. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing northeast late. A chance
of rain showers and a slight chance of thunderstorms by mid
afternoon. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. Rain showers and a chance of
thunderstorms. Waves building to 4 to 8 feet occasionally to
10 feet.
.FRIDAY...Northeast winds 10 to 20 knots backing northwest 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 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 2 to 4 feet.

$$

LSZ263-222000-
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 AM EDT Wed Apr 22 2026

.REST OF TODAY...Southeast winds less than 10 knots becoming east
5 to 15 knots in the afternoon, then becoming northeast 10 to
20 knots late. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
A chance of rain showers. A slight chance of thunderstorms after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of rain showers by mid afternoon.
Waves building to 7 to 10 feet occasionally to 13 feet.
.THURSDAY NIGHT...East gales to 35 knots. Rain showers likely and
a chance of thunderstorms. Waves building to 8 to 12 feet
occasionally to 15 feet.
.FRIDAY...East winds 20 to 30 knots becoming west 15 to 25 knots
by mid afternoon. A slight chance of thunderstorms through early
afternoon. Rain showers likely. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 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 southeast. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-222000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Wed Apr 22 2026

.REST OF TODAY...Southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 15 to 25 knots veering southeast after
midnight. A chance of rain showers after midnight. Waves building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southeast winds 20 to 30 knots becoming east to
30 knots with a few gale force gusts to 35 knots possible late.
Waves building to 7 to 10 feet occasionally to 13 feet.
.THURSDAY NIGHT...Southeast gales to 35 knots. A chance of rain
showers and a slight chance of thunderstorms. 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 likely and a slight
chance of thunderstorms. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY NIGHT...South 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 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-222000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Wed Apr 22 2026

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots. A slight chance of
rain showers after midnight. Waves building to 1 to 3 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 gales to 35 knots. A chance of rain
showers and a slight chance of thunderstorms. Waves building to
7 to 10 feet occasionally to 13 feet.
.FRIDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. A chance of rain showers through early
afternoon. A slight chance of thunderstorms. Rain showers likely
by mid afternoon. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ266-222000-
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 AM EDT Wed Apr 22 2026

.REST OF TODAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of rain showers after midnight.
Waves 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 6 to 9 feet occasionally to 11 feet.
.THURSDAY NIGHT...Southeast gales to 40 knots. A chance of rain
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.FRIDAY...Southeast gales to 40 knots. A chance of rain showers
through early afternoon, then rain showers likely and a slight
chance of thunderstorms by mid afternoon. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Southeast winds 20 to 30 knots diminishing to
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 diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ267-222000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Wed Apr 22 2026

.REST OF TODAY...East winds 5 to 15 knots backing northeast in
the afternoon, then veering east late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. Waves 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 gales to 40 knots. A slight chance of
rain showers after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY...Southeast gales to 35 knots. A chance of rain showers.
Waves subsiding to 4 to 7 feet occasionally to 9 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 diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ261-222000-
MAFOR 2215/
Superior West 11200 11110 11120 11130 14220. A chance of rain
showers overnight. Waves 2 feet or less this afternoon. Waves 2
to 4 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet
subsiding to 2 to 4 feet Thursday morning.

Superior North Central 11300 12310 11320 13330 11340. A chance of
rain showers overnight and Thursday morning. Waves 2 feet or less
this afternoon. Waves 1 to 3 feet building to 2 to 4 feet
tonight. Waves 3 to 6 feet Thursday morning.

Superior South Central 11300 11310 14320 11320 11330. Waves 2
feet or less this afternoon. Waves 1 to 3 feet tonight. Waves 2
to 4 feet building to 3 to 5 feet Thursday morning.

Superior East 12200 12210 11310 11320 11330 11340. Waves 2 feet
or less this afternoon and tonight. Waves 2 to 4 feet building to
3 to 5 feet Thursday 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