699
FZUS63 KMQT 162001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EDT Thu Apr 16 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...

Weak ridging of around 29.8 inches persists over Lake Superior
through tonight. Troughing averaging 29.5 inches moves across the
lake Friday evening and Saturday morning. Ridging builds over Lake
Superior the remainder of Saturday and throughout Sunday, reaching
about 30.3 inches Monday morning. This gives way quickly to
troughing Monday evening as a low swings southeast through Ontario
toward James Bay, decreasing to around 29.6 by Monday evening.


LSZ162-170800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Thu Apr 16 2026 /300 PM CDT Thu Apr 16 2026/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northeast winds 10 to 20 knots. Patchy fog. Waves
building to 2 to 4 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast in the
afternoon, then backing northwest late. Patchy fog through early
afternoon. Rain showers likely and a chance of thunderstorms by
mid afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots late. Rain showers likely and a slight chance of
thunderstorms through midnight, then a slight chance of rain
showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. A slight chance of snow showers. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-170800-
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-
400 PM EDT Thu Apr 16 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast late.
Patchy fog. Waves building to 2 to 4 feet.
.FRIDAY...East winds 10 to 20 knots veering south late. Patchy
fog through early afternoon. A chance of showers and
thunderstorms by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. Rain showers and a
chance of thunderstorms through midnight, then a slight chance of
rain showers, snow showers and sleet after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
4 to 7 feet occasionally to 9 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-170800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EDT Thu Apr 16 2026

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Patchy fog through midnight, then areas
of dense fog after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Areas of dense fog through early
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming west 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
Rain showers and a chance of thunderstorms through midnight, then
a chance of rain showers, possibly mixed with freezing rain, snow
showers and sleet after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...West gales to 35 knots. A slight chance of snow
showers through early afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 20 to 30 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-170800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Thu Apr 16 2026

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy dense
fog. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of dense fog. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 20 to 30 knots becoming south to
30 knots with a few gale force gusts to 35 knots possible late. A
slight chance of rain showers by mid afternoon. Waves building to
6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible becoming west 20 to 30 knots after
midnight, then increasing to 30 knots with a few gale force gusts
to 35 knots possible late. Rain showers and a chance of
thunderstorms through midnight, then a chance of rain showers,
possibly mixed with snow and sleet after midnight. Waves building
to 7 to 10 feet occasionally to 13 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...West gales to 40 knots. A slight chance of rain
showers through early afternoon. A slight chance of snow showers
and sleet. Waves building to 7 to 10 feet occasionally to
13 feet.
.SATURDAY NIGHT...Northwest gales to 40 knots. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots becoming south gales to
35 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ266-170800-
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-
400 PM EDT Thu Apr 16 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy dense
fog. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Areas of dense fog. Waves building to
3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming south to 30 knots with a
few gale force gusts to 35 knots possible late. Areas of dense
fog through early afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.FRIDAY NIGHT...South winds to 30 knots with a few gale force
gusts to 35 knots possible veering west late. A slight chance of
thunderstorms through midnight. Rain showers. A slight chance of
sleet after midnight. Waves building to 8 to 11 feet occasionally
to 14 feet, then subsiding to 5 to 8 feet occasionally to
10 feet.
.SATURDAY...West gales to 40 knots. A slight chance of rain
showers through early afternoon. A slight chance of freezing
rain, snow showers and sleet. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SATURDAY NIGHT...Northwest gales to 40 knots. Waves 10 to
14 feet occasionally to 18 feet.
.SUNDAY...Northwest gales to 35 knots. Waves subsiding to 6 to
9 feet occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots increasing to gales to
40 knots. Waves subsiding to calm to 2 feet, then building to
7 to 10 feet occasionally to 13 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ267-170800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Thu Apr 16 2026

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Areas of
dense fog. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Areas of dense fog through midnight, then widespread
dense fog after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 20 to
30 knots. Areas of dense fog through early afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Southeast winds to 30 knots with a few gale force
gusts to 35 knots possible veering south after midnight, then
veering west late. Rain showers and a slight chance of
thunderstorms. Waves building to 4 to 8 feet occasionally to
10 feet.
.SATURDAY...West gales to 40 knots. A chance of rain showers,
possibly mixed with snow. A slight chance of sleet by mid
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet.
.SATURDAY NIGHT...West gales to 40 knots veering northwest after
midnight. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.SUNDAY...Northwest gales to 40 knots. Waves subsiding to 7 to
10 feet occasionally to 13 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 10 to 20 knots increasing to gales to
35 knots. Waves subsiding to calm to 2 feet, then building to
6 to 9 feet occasionally to 11 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ261-170200-
MAFOR 1621/
Superior West 12210 11120 13220 11210 11110. A chance of rain
showers Friday afternoon. Waves 1 to 3 feet building to 2 to 4
feet tonight. Waves 2 to 4 feet Friday.

Superior North Central 11300 11310 13324 11334 11330 11340. Waves
1 to 3 feet building to 2 to 4 feet tonight. Waves 3 to 6 feet
building to 4 to 7 feet Friday.

Superior South Central 11210 19214 11310 13324 11334 12340. Waves
1 to 3 feet tonight. Waves 2 to 4 feet building to 4 to 7 feet
Friday.

Superior East 11800 19804 11204 11304 11314 12324 12330. Waves 2
feet or less tonight. Waves 1 to 3 feet building to 3 to 6 feet
Friday.

$$

WFO MQT

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weather.gov/mqt/glftable

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weather.gov/greatlakes