National Weather Service Marine Forecast FZUS63 KMQT
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
Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable
Graphical marine forecasts are available online at: weather.gov/greatlakes
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