National Weather Service Marine Forecast FZUS63 KMQT
FZUS63 KMQT 120801
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Thu Jun 12 2025
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
Throughout this morning, a 30.3 inch high over northern Manitoba shifts to northern Ontario, extending 30.2 inch ridging over Lake Superior. The high reaches James Bay by Friday afternoon, maintaining strength with 30.2 ridging remaining over the lake through the weekend. Monday, high pressure shifts east of the Great Lakes while a broad low pressure of 29.7 inches moves over the Plains, with the low arriving over the Great Lakes late Monday into early Tuesday morning.
LSZ162-122000
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM
401 AM EDT Thu Jun 12 2025 /301 AM CDT Thu Jun 12 2025/
EARLY THIS MORNING
Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
TODAY
Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet.
TONIGHT
Northeast winds 10 to 20 knots veering east late. A
chance of showers. Waves 2 to 4 feet.
FRIDAY
East winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
FRIDAY NIGHT
Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to 1 to 3 feet.
SATURDAY
Northeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
SATURDAY NIGHT
Northeast winds 5 to 15 knots. Waves calm to
2 feet.
SUNDAY
East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
MONDAY
East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.
LSZ263-122000
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 AM EDT Thu Jun 12 2025
EARLY THIS MORNING
Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
TODAY
Northeast winds 5 to 15 knots veering east late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
TONIGHT
East winds 5 to 15 knots. A chance of showers. Waves
subsiding to calm to 2 feet.
FRIDAY
East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers. Waves building to 1 to 3 feet.
FRIDAY NIGHT
East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
SATURDAY
Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
SATURDAY NIGHT
Northeast winds 5 to 15 knots becoming east
less than 10 knots after midnight. Waves calm to 2 feet.
SUNDAY
East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
MONDAY
South winds 5 to 15 knots veering southwest. A chance
of showers and thunderstorms. Waves calm to 2 feet.
LSZ264-122000
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border
401 AM EDT Thu Jun 12 2025
EARLY THIS MORNING
North winds 5 to 15 knots. Waves calm to
2 feet.
TODAY
North winds 5 to 15 knots veering northeast in the
afternoon, then veering south late. Waves calm to 2 feet.
TONIGHT
East winds 5 to 15 knots diminishing to less than
10 knots after midnight. A slight chance of rain showers after
midnight. Waves calm to 2 feet.
FRIDAY
East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. A chance of showers. Waves calm to
2 feet.
FRIDAY NIGHT
East winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
SATURDAY
East winds 5 to 15 knots. Waves calm to 2 feet.
SATURDAY NIGHT
East winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves calm to 2 feet.
SUNDAY
Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
MONDAY
South winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.
LSZ265-122000
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore
401 AM EDT Thu Jun 12 2025
EARLY THIS MORNING
North winds 5 to 15 knots. Waves calm to
2 feet.
TODAY
North winds 5 to 15 knots veering east late. Waves calm
to 2 feet.
TONIGHT
Southeast winds 5 to 15 knots backing east after
midnight, then veering southeast late. A chance of rain showers
after midnight. Waves calm to 2 feet.
FRIDAY
East winds 5 to 15 knots increasing to 10 to 20 knots
late. Showers likely through early afternoon, then a chance of
showers by mid afternoon. Waves calm to 2 feet.
FRIDAY NIGHT
East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
SATURDAY
East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
SATURDAY NIGHT
Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
SUNDAY
East winds 5 to 15 knots veering south. Waves calm to
2 feet.
MONDAY
Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
LSZ266-122000
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 AM EDT Thu Jun 12 2025
EARLY THIS MORNING
North winds 5 to 15 knots. Waves calm to
2 feet.
TODAY
North winds 5 to 15 knots backing northwest late. Waves
calm to 2 feet.
TONIGHT
Northwest winds 5 to 15 knots veering northeast after
midnight, then veering east late. A chance of rain showers after
midnight. Waves calm to 2 feet.
FRIDAY
East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
FRIDAY NIGHT
East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
SATURDAY
East winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
SATURDAY NIGHT
Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
SUNDAY
North winds 5 to 15 knots veering south. Waves calm to
2 feet.
MONDAY
South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.
LSZ267-122000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border
401 AM EDT Thu Jun 12 2025
EARLY THIS MORNING
North winds 10 to 20 knots. Waves calm to
2 feet.
TODAY
North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. Waves calm to 2 feet.
TONIGHT
Northwest winds 5 to 15 knots veering north after
midnight, then veering east late. A chance of rain showers after
midnight. Waves calm to 2 feet.
FRIDAY
East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A chance of showers. Waves calm to 2 feet.
FRIDAY NIGHT
East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
SATURDAY
East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
SATURDAY NIGHT
Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
SUNDAY
North winds 5 to 15 knots veering south. Waves calm to
2 feet.
MONDAY
East winds 5 to 15 knots becoming south 10 to 20 knots.
A chance of showers. Waves calm to 2 feet.
LSZ261-121400
MAFOR 1209/
Superior West 11210 14110 11110 12210. A chance of showers
overnight. Waves 1 to 3 feet.
Superior North Central 12800 11100 11200 11300 11400 11300 11200. Waves 2 feet or less.
Superior South Central 12800 12100 11200 11400 11300 11200. Waves 1 foot or less.
Superior East 13800 13700 11800 11100. Waves 1 to 2 feet.
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