832
FZUS63 KMQT 220201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Tue Apr 21 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 ridging strengthens over the lake tonight,
remaining in place through Wednesday. A 29.2 inch low then develops
over the Northern Rockies on Wednesday and tracks into Manitoba by
no later than Thursday evening. This sends 29.6 to 29.7 inch
troughing over Lake Superior Thursday night into Friday. 30.1 inch
ridging slowly returns to Lake Superior on Saturday.


LSZ162-220800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Tue Apr 21 2026 /900 PM CDT Tue Apr 21 2026/

.REST OF TONIGHT...East winds less than 10 knots increasing to
5 to 15 knots late. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots veering east
late. A chance of rain showers and a slight chance of
thunderstorms. Waves building to 2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of showers and
thunderstorms by mid afternoon. Waves 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 7 feet occasionally to
9 feet.
.FRIDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming northeast
5 to 15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ263-220800-
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 Tue Apr 21 2026

.REST OF TONIGHT...East winds less than 10 knots veering
southeast late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing east late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. A chance of rain
showers and 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 by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots. A chance of rain
showers through midnight. A chance of thunderstorms. Rain showers
likely after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.FRIDAY...East winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. Rain showers likely through early afternoon. A
chance of rain showers by mid afternoon. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 10 to 20 knots becoming east 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ264-220800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Tue Apr 21 2026

.REST OF TONIGHT...West winds less than 10 knots backing
southeast late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing east late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of rain showers 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 by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 35 knots after midnight. 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 becoming east 20 to
30 knots by mid afternoon. Rain showers likely. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North 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 increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.

$$

LSZ265-220800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Tue Apr 21 2026

.REST OF TONIGHT...Northwest winds 5 to 15 knots backing
southeast late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 15 to 25 knots. A slight
chance of rain showers after midnight. Waves building to 2 to
4 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...Southeast gales to 35 knots. A chance of rain
showers. A slight chance of thunderstorms after midnight. Waves
5 to 8 feet occasionally to 10 feet.
.FRIDAY...Southeast gales to 35 knots becoming east 20 to
30 knots by mid afternoon. Rain showers likely. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots. A chance of rain
showers. Waves 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 10 to 20 knots backing east. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots. Waves building to 2 to
4 feet.

$$

LSZ266-220800-
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 Tue Apr 21 2026

.REST OF TONIGHT...Northwest winds 5 to 15 knots veering east
late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots late. Waves building to 2 to 4 feet.
.THURSDAY...East winds 20 to 30 knots. A slight chance of rain
showers through early afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...Southeast gales to 35 knots. A chance of rain
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.FRIDAY...Southeast gales to 35 knots becoming east 20 to
30 knots by mid afternoon. A chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots. Waves building to 2 to 4 feet.

$$

LSZ267-220800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Tue Apr 21 2026

.REST OF TONIGHT...Northwest winds 5 to 15 knots veering
northeast late. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southeast late. Waves
building to 1 to 3 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A slight chance of rain showers
through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. A slight chance of rain showers
after midnight. Waves building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. Rain showers likely
through midnight, then a chance of rain showers after midnight.
Waves 3 to 5 feet occasionally to 7 feet.
.SATURDAY...East winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SUNDAY...North winds 5 to 15 knots veering east. Waves building
to 1 to 3 feet.

$$

LSZ261-220800-
MAFOR 2203/
Superior West 14200 11200 11210 12120. Waves 2 feet or less
overnight and Wednesday. Waves 1 to 3 feet Wednesday evening.

Superior North Central 11600 11100 13300 12310 11320. Waves 2
feet or less.

Superior South Central 12700 13300 11310 12320. Waves 2 feet or
less overnight and Wednesday. Waves 1 to 3 feet Wednesday
evening.

Superior East 11700 11800 11100 12300 12200 11210. Waves 1 foot
or less.

$$

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