566
FZUS63 KMQT 211501
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EST Sat Feb 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...

A 29.7 inch low over Lake Huron this morning gradually weakens to
30.0 inches by tonight as it slowly meanders into southern Ontario.
Meanwhile, 31.2 inch high pressure builds over northern
Saskatchewan. Through Sunday, the low is gradually absorbed into a
29.1 inch nor`easter off the Delmarva Peninsula as high pressure
slides over Manitoba at 31.0 inches, extending 30.6 inch ridging
over western Lake Superior. The high weakens slightly to 30.8 inches
over northern Ontario by Monday afternoon before sharply weakening
to 30.3 inches over the Ontario/Quebec line Tuesday morning.
Meanwhile, broad 29.8 inch low pressure forms over the Plains,
sending at least one low of around 29.5 inches through the Great
Lakes basin during the midweek period. Weak ridging then builds over
Lake Superior at around 29.9 inches for Thursday.


LSZ162-212100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EST Sat Feb 21 2026 /900 AM CST Sat Feb 21 2026/

.REST OF TODAY...Northwest winds 10 to 20 knots. A slight chance
of snow showers. Waves 1 to 3 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north by
midnight, then increasing to 20 to 30 knots late. A slight chance
of snow showers in the evening. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...North winds 20 to 30 knots. A slight chance of snow
showers in the morning. Waves 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots becoming east 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. A chance of snow
showers. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-212100-
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 EST Sat Feb 21 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SUNDAY MORNING
THROUGH LATE SUNDAY NIGHT...

.REST OF TODAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then backing northwest by mid
afternoon. A chance of snow showers. Waves 2 to 4 feet subsiding
to 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots by midnight. A chance of snow showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...North winds 20 to 30 knots. Heavy freezing spray. A
slight chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...North gales to 35 knots. Heavy freezing spray and
a slight chance of. A slight chance of. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds 15 to 25 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A chance of snow showers after midnight.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-212100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EST Sat Feb 21 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM LATE TONIGHT
THROUGH LATE SUNDAY NIGHT...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TODAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then increasing to 10 to 20 knots by
mid afternoon. Snow showers. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.TONIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of snow showers. Freezing spray after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...North winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Heavy freezing spray. A slight chance
of snow showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.SUNDAY NIGHT...North gales to 35 knots. Heavy freezing spray.
Waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon. Heavy freezing spray in the morning.
Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.TUESDAY...South winds 15 to 25 knots backing southeast. Freezing
spray. A chance of snow showers. Waves building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-212100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EST Sat Feb 21 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SUNDAY AFTERNOON
THROUGH LATE SUNDAY NIGHT...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.REST OF TODAY...Northwest winds 15 to 25 knots increasing to
20 to 30 knots by mid afternoon. Snow showers. Waves 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then veering north late. Snow showers
likely in the evening, then a chance of snow showers after
midnight. Freezing spray after midnight. Waves building to 4 to
7 feet occasionally to 9 feet.
.SUNDAY...North gales to 35 knots. Freezing spray. A chance of
snow showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.SUNDAY NIGHT...North gales to 40 knots. Heavy freezing spray. A
chance of snow showers. Waves building to 8 to 12 feet
occasionally to 15 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...North winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.TUESDAY...South winds 15 to 25 knots. Freezing spray. A chance
of snow showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Freezing spray. A
chance of snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-212100-
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 EST Sat Feb 21 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SUNDAY AFTERNOON
THROUGH LATE SUNDAY NIGHT...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY
MORNING...

.REST OF TODAY...East winds 10 to 20 knots becoming northeast
15 to 25 knots by late morning, then backing north by mid
afternoon. A chance of snow showers. Waves 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots. A chance of snow showers.
Freezing spray after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...North winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Freezing spray. A chance of snow
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY NIGHT...North gales to 40 knots. Heavy freezing spray. A
chance of snow showers. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 8 to 11 feet
occasionally to 14 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 10 to 20 knots veering southeast
after midnight. A chance of snow showers after midnight. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots increasing to gales
to 35 knots. Freezing spray. A chance of snow showers. Waves
building to 8 to 12 feet occasionally to 15 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-212100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EST Sat Feb 21 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SUNDAY AFTERNOON
THROUGH LATE SUNDAY NIGHT...

.REST OF TODAY...East winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then backing northeast by mid
afternoon. A slight chance of snow showers in the afternoon.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by midnight. A slight chance of snow showers. Waves
building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots increasing to 20 to
30 knots. A slight chance of snow showers in the morning.
Freezing spray in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...North gales to 35 knots. Heavy freezing spray and
a slight chance of. A slight chance of. Waves building to 5 to
9 feet occasionally to 11 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Heavy freezing spray in the morning.
Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots veering north.
Freezing spray. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet, then building to 7 to 10 feet
occasionally to 13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-212100-
MAFOR 2116/
Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...12710
11720 11820 14830. Waves 2 to 3 feet this afternoon. Waves 2 to 4
feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Sunday
morning.

Superior North Central...HEAVY FREEZING SPRAY WARNING IN EFFECT...
12827 11837 12830 11840 12842. Waves 3 to 5 feet this afternoon.
Waves 3 to 6 feet building to 5 to 7 feet tonight. Waves 5 to 8
feet Sunday morning.

Superior South Central 14737 11737 11741 11841 11840. Waves 3 to
5 feet this afternoon. Waves 3 to 6 feet building to 4 to 7 feet
tonight. Waves 5 to 8 feet Sunday morning.

Superior East 11220 11110 11810 12110 11120 11820 11130. Waves 1
to 3 feet this afternoon and tonight. Waves 2 to 4 feet building
to 3 to 5 feet Sunday 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