FZUS63 KMQT 280215
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 PM EDT Sat Sep 27 2025
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...A 29.8 inch trough analyzed over eastern Lake Superior this evening
continues to move eastward tonight, with heights rising midnight
onwards as a weak 29.9 inch high over the Central Plains strengthens
to 30.1 inches. This high shifts into WI Sunday morning and then
toward the eastern Great Lakes into Monday morning. Meanwhile, low
pressure moves into the Plains and a 30.2 inch high pressure builds
into Manitoba and northern Ontario. The high over northern Ontario
builds to 30.5 inches as it shifts southeast to Quebec through
Thursday, maintaining high pressure ridging of at least 30.2 inches
over Lake Superior.
LSZ162-280800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sat Sep 27 2025 /901 PM CDT Sat Sep 27 2025/
.REST OF TONIGHT, West winds 10 to 20 knots backing southwest
late. Waves calm to 2 feet.
.SUNDAY, Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT, Southwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves subsiding to calm to 2 feet.
.MONDAY, Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT, Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY, Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY NIGHT, Northeast winds 10 to 20 knots veering east
after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY, East winds 10 to 20 knots veering south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY, South winds 10 to 20 knots veering southwest. Waves
subsiding to calm to 2 feet.
LSZ162-280800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 PM EDT Sat Sep 27 2025 /915 PM CDT Sat Sep 27 2025/
.Overnight...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the evening.
.MONDAY...
Weather.............Sunny.
Sfc winds...........Southwest 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........Southwest 10 to 15 knots in the morning
becoming light and variable.
Sig waves...........1 to 3 feet.
.MONDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ263-280800-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 PM EDT Sat Sep 27 2025
.Overnight...
Weather.............Mostly clear.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet subsiding to around 5 feet after
midnight.
.MONDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.MONDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ264-280800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 PM EDT Sat Sep 27 2025
.Overnight...
Weather.............Mostly clear.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.MONDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.MONDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 5 to 10 knots becoming northeast 10 to 15
knots after midnight.
100-ft winds........North 10 to 15 knots becoming northeast 15 to
20 knots after midnight.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ265-280800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 PM EDT Sat Sep 27 2025
.Overnight...
Weather.............Mostly clear.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southeast 5 to 10 knots becoming south after
midnight.
100-ft winds........Southeast 10 to 15 knots becoming south after
midnight.
Sig waves...........1 to 3 feet.
.MONDAY...
Weather.............Sunny.
Sfc winds...........Southwest 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........Southwest 10 to 15 knots in the morning
becoming light and variable.
Sig waves...........2 feet or less.
.MONDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ266-280800-
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-
1015 PM EDT Sat Sep 27 2025
.Overnight...
Weather.............Mostly clear.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.MONDAY...
Weather.............Sunny.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.MONDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 5 to 10 knots becoming east after
midnight.
100-ft winds........North 10 to 15 knots becoming east after
midnight.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ267-280800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 PM EDT Sat Sep 27 2025
.Overnight...
Weather.............Mostly clear.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........West 10 to 15 knots becoming southwest in the
afternoon.
100-ft winds........West 15 to 20 knots becoming southwest in the
afternoon.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
afternoon.
Ocnl waves..........Around 6 feet subsiding to around 5 feet in the
afternoon.
.SUNDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.MONDAY...
Weather.............Sunny.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.MONDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 5 to 10 knots becoming east after
midnight.
100-ft winds........North 10 to 15 knots becoming east after
midnight.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.WEDNESDAY...Northeast winds 10 to 15 knots. Waves 4 to 6 feet.
.THURSDAY...Southeast winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ261-280800-
MAFOR 2803/
Superior West 12610 14520 11520 11510. Waves 1 to 3 feet.
Superior North Central 12620 11520 14530 11520. Waves 3 to 5 feet
subsiding to 2 to 4 feet overnight. Waves 2 to 4 feet building to
3 to 5 feet Sunday. Waves 3 to 5 feet subsiding to 2 to 4 feet
Sunday evening.
Superior South Central 14620 11620 11610 11500 11400. Waves 1 to
3 feet overnight and Sunday. Waves 1 foot or less Sunday evening.
Superior East 11630 11720 12610 11520 13510. Waves 3 to 5 feet
overnight. Waves 2 to 4 feet Sunday. Waves 1 to 3 feet Sunday
evening.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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