635
FZUS63 KMQT 172101
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EST Tue Feb 17 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...

30.1 inch ridging this afternoon gives way to pressure falls tonight
as 29.1 inch low pressure ejects out of the Northern Plains.
Pressure will fall to at least 29.7 inches over the lake by
Wednesday morning. 29.8 inch troughing then persists over the lake
through Thursday, deepening to 29.5 inches by Friday morning as a
29.3 inch low approaches Upper Michigan from the south. This feature
weakens over Lake Huron Saturday, but continues to extend weak 29.9
inch troughing over Lake Superior at least through Saturday
afternoon.


LSZ162-180900-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EST Tue Feb 17 2026 /301 PM CST Tue Feb 17 2026/

...GALE WARNING IN EFFECT UNTIL 10 PM EST /9 PM CST/ THIS
EVENING...
...STORM WARNING IN EFFECT FROM 10 PM EST /9 PM CST/ THIS EVENING
THROUGH WEDNESDAY EVENING...

.LATE THIS AFTERNOON...East gales to 40 knots. Waves 3 to 6 feet
occasionally to 8 feet building to 4 to 7 feet occasionally to
9 feet.
.TONIGHT...East gales to 45 knots increasing to storm force winds
to 55 knots late. A chance of snow in the evening, then snow,
possibly mixed with sleet after midnight. Waves building to 7 to
10 feet occasionally to 13 feet.
.WEDNESDAY...East storm force winds to 55 knots diminishing to
gales to 45 knots by mid afternoon. Snow. Rain likely in the
afternoon. Waves 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...East gales to 45 knots. Snow showers likely.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...East gales to 35 knots becoming northeast 20 to
30 knots in the afternoon. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northeast winds 20 to 30 knots. A chance of
snow. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northeast winds 20 to 30 knots. A chance of snow. Waves
2 to 4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots backing northwest
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-180900-
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-
401 PM EST Tue Feb 17 2026

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH LATE
WEDNESDAY NIGHT...

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...East gales to 45 knots. A slight chance of snow in the
evening, then snow, possibly mixed with freezing rain and sleet
after midnight. Waves building to 12 to 17 feet occasionally to
21 feet.
.WEDNESDAY...East gales to 45 knots with a few storm force gusts
to 55 knots possible diminishing to gales to 45 knots. Snow. Rain
likely in the afternoon. Waves building to 17 to 22 feet
occasionally to 28 feet, then subsiding to 15 to 20 feet
occasionally to 25 feet.
.WEDNESDAY NIGHT...East gales to 45 knots. A chance of snow
showers. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.THURSDAY...East gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. A chance of snow showers. A slight chance of
rain showers in the afternoon. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots becoming northeast
gales to 35 knots after midnight. A chance of snow. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...Northeast winds 20 to 30 knots. A chance of snow. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. A chance of snow
showers. Waves 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-180900-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EST Tue Feb 17 2026

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH
THURSDAY MORNING...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
40 knots by midnight. Freezing spray after midnight. A chance of
snow after midnight. Waves building to 12 to 17 feet occasionally
to 21 feet.
.WEDNESDAY...East gales to 45 knots with a few storm force gusts
to 50 knots possible diminishing to gales to 45 knots. Freezing
spray. Snow. Waves building to 17 to 22 feet occasionally to
28 feet, then subsiding to 15 to 20 feet occasionally to 25 feet.
.WEDNESDAY NIGHT...East gales to 40 knots. Freezing spray in the
evening. A chance of snow showers. Waves subsiding to 10 to
14 feet occasionally to 18 feet.
.THURSDAY...East gales to 35 knots. A chance of snow showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots increasing to gales
to 35 knots after midnight. A chance of snow. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.FRIDAY...East gales to 35 knots backing northeast in the
afternoon. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...Northeast winds 15 to 25 knots backing north
after midnight. Freezing spray. A chance of snow showers. Waves
4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to 2 to 4 feet, then building to 5 to
8 feet occasionally to 10 feet.
.SUNDAY...North winds 15 to 25 knots. Waves subsiding to 4 to
7 feet occasionally to 9 feet, then building to 6 to 9 feet
occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-180900-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EST Tue Feb 17 2026

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH LATE
WEDNESDAY NIGHT...

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Waves calm to
2 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
40 knots by midnight. Snow likely after midnight. Waves building
to 12 to 17 feet occasionally to 21 feet.
.WEDNESDAY...East gales to 45 knots. Snow. Waves building to
15 to 20 feet occasionally to 25 feet, then subsiding to 12 to
17 feet occasionally to 21 feet.
.WEDNESDAY NIGHT...East gales to 40 knots. A chance of snow
showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.THURSDAY...East gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. A chance of snow showers. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...East winds 20 to 30 knots increasing to gales
to 35 knots after midnight. A chance of snow. Waves 5 to 8 feet
occasionally to 10 feet.
.FRIDAY...East gales to 35 knots backing northeast in the
afternoon. Snow likely. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots backing northwest
after midnight. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...Northwest winds 20 to 30 knots. Waves subsiding to
2 to 4 feet, then building to 5 to 8 feet occasionally to
10 feet.
.SUNDAY...Northwest winds 20 to 30 knots. Waves building to 6 to
10 feet occasionally to 13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-180900-
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-
401 PM EST Tue Feb 17 2026

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH LATE
WEDNESDAY NIGHT...

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
40 knots by midnight. Freezing spray after midnight. A chance of
snow after midnight. Waves building to 12 to 17 feet occasionally
to 21 feet.
.WEDNESDAY...East gales to 45 knots with a few storm force gusts
to 50 knots possible diminishing to gales to 45 knots. Freezing
spray. A slight chance of freezing rain and sleet in the morning.
Snow. Waves building to 15 to 20 feet occasionally to 25 feet.
.WEDNESDAY NIGHT...East gales to 40 knots. Freezing spray in the
evening. A chance of snow showers. Waves subsiding to 10 to
14 feet occasionally to 18 feet.
.THURSDAY...East gales to 40 knots. A chance of snow showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.THURSDAY NIGHT...East gales to 40 knots. A chance of snow. Waves
subsiding to 5 to 8 feet occasionally to 10 feet, then building
to 6 to 9 feet occasionally to 11 feet.
.FRIDAY...East gales to 40 knots. A chance of snow in the
morning, then snow likely in the afternoon. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots backing northeast after
midnight. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...Northwest winds 20 to 30 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY...North winds 20 to 30 knots. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-180900-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EST Tue Feb 17 2026

...GALE WARNING IN EFFECT FROM WEDNESDAY MORNING THROUGH
WEDNESDAY EVENING...

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 15 to 25 knots increasing to gales to
35 knots. Freezing spray after midnight. A chance of snow after
midnight. Waves building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...East gales to 40 knots. Freezing spray. A slight
chance of sleet in the morning. Snow. Waves building to 7 to
11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...East gales to 35 knots. Freezing spray. A
chance of snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...East gales to 35 knots becoming southeast 20 to
30 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...East gales to 35 knots. A chance of snow. Waves
3 to 6 feet occasionally to 8 feet.
.FRIDAY...East gales to 35 knots. A chance of snow in the
morning, then snow likely in the afternoon. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots. A chance of snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots. Waves building to 5 to
8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-180300-
MAFOR 1722/
Superior West...STORM WARNING IN EFFECT...12250 11267 14277
11277. Waves omitted due to the lake being mostly ice covered.

Superior North Central...GALE WARNING IN EFFECT...11230 11240
11250 11251 11261 11277 12267. Waves 2 to 4 feet building to 12
to 16 feet tonight. Waves 14 to 18 feet building to 15 to 20 feet
Wednesday.

Superior South Central...GALE WARNING IN EFFECT...11220 11240
11250 11257 11267 11277 12267. Waves 2 feet or less building to
11 to 15 feet tonight. Waves 13 to 17 feet building to 14 to 19
feet Wednesday. Wave heights are for ice free areas.

Superior East...GALE WARNING IN EFFECT...11210 11240 11250 12251
13267. Waves 1 to 2 feet building to 6 to 10 feet tonight. Waves
9 to 13 feet Wednesday.

$$

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