National Weather Service Marine Forecast FZUS63 KMQT
FZUS63 KMQT 270201
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Thu Mar 26 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
Tonight, Lake Superior is situated between an elongated 29.7 inch trough extending from New England to western Pennsylvania and a 30.6 inch high over Saskatchewan. Through Friday morning, as the low moves off the Atlantic coast, the high will build to 30.8 inches over the North Dakota/Montana line. This high slowly slides southeast through Friday and into Saturday morning, weakening to 30.6 inches south of Lake Michigan midday Saturday. As the high further weakens to 30.5 inches over the northern Appalachian Range late Saturday night, broad 29.7 inch low pressure develops in the Colorado/Wyoming area. Sunday, the high shifts offshore while the low extends a weak 30.0 inch trough over Lake Superior Sunday evening. By Monday afternoon, the trough is pushed east by a 30.2 inch high over the Ontario/Manitoba line. Tuesday, the high builds to 30.4 inches over far northern Ontario while low pressure over the Northern Plains deepens to 29.5 inches. The low approaches the Great Lakes late Tuesday into Wednesday.
LSZ162-270800
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM
1000 PM EDT Thu Mar 26 2026 /900 PM CDT Thu Mar 26 2026/
REST OF TONIGHT
North winds 10 to 20 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
FRIDAY
Northwest winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
FRIDAY NIGHT
Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
SATURDAY
Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
SATURDAY NIGHT
East winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves calm to 2 feet.
SUNDAY
Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
SUNDAY NIGHT
Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
MONDAY
Northeast winds 10 to 20 knots becoming east 15 to
25 knots. Waves building to 4 to 7 feet occasionally to 9 feet.
TUESDAY
East winds 15 to 25 knots becoming northeast 20 to
30 knots. A chance of rain and snow showers. Waves building to
7 to 10 feet occasionally to 13 feet.
LSZ263-270800
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 Thu Mar 26 2026
REST OF TONIGHT
North winds 5 to 15 knots. A slight chance of
snow showers after midnight. Waves 2 to 4 feet subsiding to calm
to 2 feet.
FRIDAY
Northwest winds 5 to 15 knots increasing to 15 to
25 knots. A slight chance of snow showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
FRIDAY NIGHT
Northwest winds 15 to 25 knots backing west late.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
SATURDAY
West winds 10 to 20 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
SATURDAY NIGHT
Southeast winds 5 to 15 knots backing east
after midnight. Waves calm to 2 feet.
SUNDAY
Northeast winds 5 to 15 knots. Waves calm to 2 feet.
SUNDAY NIGHT
Northeast winds 10 to 20 knots backing north
after midnight. Waves building to 1 to 3 feet.
MONDAY
Northeast winds 10 to 20 knots becoming east 20 to
30 knots. Waves subsiding to calm to 2 feet, then building to
4 to 7 feet occasionally to 9 feet.
TUESDAY
East winds 20 to 30 knots backing northeast. A chance
of rain and snow showers. Waves building to 9 to 12 feet
occasionally to 15 feet.
LSZ264-270800
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border
1000 PM EDT Thu Mar 26 2026
REST OF TONIGHT
North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves 3 to 6 feet occasionally to 8 feet subsiding to
1 to 3 feet.
FRIDAY
Northwest winds 5 to 15 knots increasing to 15 to
25 knots. A slight chance of snow showers. Waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet.
FRIDAY NIGHT
Northwest winds 15 to 25 knots. Freezing spray
through midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
SATURDAY
West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
SATURDAY NIGHT
South winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
SUNDAY
Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
SUNDAY NIGHT
East winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
MONDAY
North winds 10 to 20 knots becoming east 20 to
30 knots. Waves subsiding to calm to 2 feet, then building to
4 to 7 feet occasionally to 9 feet.
TUESDAY
East winds 20 to 30 knots. A chance of snow showers. A
chance of rain showers. Waves building to 9 to 12 feet
occasionally to 15 feet.
LSZ265-270800
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore
1000 PM EDT Thu Mar 26 2026
REST OF TONIGHT
North winds 15 to 25 knots diminishing to 5 to
15 knots late. Freezing spray by midnight. A slight chance of
snow showers after midnight. Waves 5 to 8 feet occasionally to
10 feet subsiding to 2 to 4 feet.
FRIDAY
Northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
FRIDAY NIGHT
Northwest winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
SATURDAY
West winds 15 to 25 knots becoming south 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
SATURDAY NIGHT
South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves calm to 2 feet.
SUNDAY
East winds 10 to 20 knots. Waves calm to 2 feet.
SUNDAY NIGHT
Southeast winds 10 to 20 knots backing north
after midnight. Waves building to 2 to 4 feet.
MONDAY
North winds 10 to 20 knots becoming east 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
TUESDAY
East winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain and snow showers. Waves building to
9 to 12 feet occasionally to 15 feet.
LSZ266-270800
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 Thu Mar 26 2026
REST OF TONIGHT
North winds 20 to 30 knots diminishing to
10 to 20 knots. Freezing spray by midnight. A slight chance of
snow showers after midnight. Waves 5 to 8 feet occasionally to
10 feet subsiding to 3 to 5 feet occasionally to 7 feet.
FRIDAY
Northwest winds 5 to 15 knots increasing to 20 to
30 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
FRIDAY NIGHT
Northwest winds 20 to 30 knots. Freezing spray.
Waves building to 5 to 8 feet occasionally to 10 feet.
SATURDAY
West winds 15 to 25 knots backing southwest by mid
afternoon. Freezing spray through early afternoon. A slight
chance of snow showers by mid afternoon. Waves subsiding to 2 to
4 feet.
SATURDAY NIGHT
South winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
SUNDAY
East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
SUNDAY NIGHT
Southeast winds 10 to 20 knots becoming north
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
MONDAY
North winds 10 to 20 knots becoming east 20 to
30 knots. Waves subsiding to 1 to 3 feet, then building to 4 to
7 feet occasionally to 9 feet.
TUESDAY
East winds 20 to 30 knots. A chance of rain and snow
showers. Waves building to 9 to 12 feet occasionally to 15 feet.
LSZ267-270800
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border
1000 PM EDT Thu Mar 26 2026
REST OF TONIGHT
North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight, then becoming northeast 5 to
15 knots late. Waves 4 to 7 feet occasionally to 9 feet subsiding
to 2 to 4 feet.
FRIDAY
South winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then becoming northwest 15 to 25 knots
late. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
FRIDAY NIGHT
Northwest winds 15 to 25 knots. Freezing spray. A
slight chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
SATURDAY
West winds 15 to 25 knots. Freezing spray through
early afternoon. A slight chance of snow showers by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
SATURDAY NIGHT
South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
SUNDAY
South winds 10 to 20 knots backing east by mid
afternoon. Waves subsiding to calm to 2 feet.
SUNDAY NIGHT
South winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
MONDAY
North winds 10 to 20 knots becoming east 15 to
25 knots. Waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet.
TUESDAY
East winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain and snow showers, then rain and snow
showers likely. Waves building to 6 to 9 feet occasionally to
11 feet.
LSZ261-270800
MAFOR 2703/
Superior West 14810 11710 13730. Waves 1 to 3 feet overnight.
Waves 1 to 2 feet building to 2 to 4 feet Friday. Waves 3 to 5
feet Friday evening.
Superior North Central 11830 11820 11810 11710 12720 11730 11741. Waves 3 to 6 feet subsiding to 2 to 4 feet overnight. Waves 1 to 3 feet Friday. Waves 3 to 6 feet Friday evening.
Superior South Central 11830 11820 11810 11710 11720 12730 11741. A chance of snow showers Friday. Waves 4 to 7 feet subsiding to 3 to 6 feet overnight. Waves 3 to 5 feet subsiding to 2 to 4 feet Friday. Waves 3 to 6 feet Friday evening.
Superior East 11830 11820 11110 11100 11610 11720 11730 11741. A chance of snow showers Friday. Waves 4 to 7 feet subsiding to 3 to 6 feet overnight. Waves 1 to 3 feet building to 2 to 4 feet Friday. Waves 3 to 6 feet Friday evening.
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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