FZUS63 KMQT 100815
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 AM EDT Thu Sep 10 2026
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...30.0 inch ridging builds over the lake today, allowing calmer
conditions until Friday morning. A trough averaging 29.5 inches
tracks from the Great Plains north toward Hudson Bay by Friday
afternoon, bringing 29.8 inch troughing to the lake. A cold front
and 29.7 inch trough passes through on Saturday with ridging in its
wake reaching 30.0 inches by Sunday. This strengthens further to
30.2 inches Monday.
LSZ162-102000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Thu Sep 10 2026 /301 AM CDT Thu Sep 10 2026/
.EARLY THIS MORNING, Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY, West winds 5 to 15 knots backing south in the afternoon.
Waves calm to 2 feet.
.TONIGHT, South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming southwest 15 to 25 knots late.
Waves building to 1 to 3 feet.
.FRIDAY, Southwest winds 20 to 30 knots backing south late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.FRIDAY NIGHT, South winds 15 to 25 knots veering southwest
after midnight. Showers and a chance of thunderstorms. Waves
subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY, West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY NIGHT, West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY, West winds 10 to 20 knots becoming east 15 to 25 knots.
A chance of showers. Waves building to 2 to 4 feet.
.MONDAY, East gales to 35 knots veering west. Showers likely,
then a chance of showers. Waves building to 5 to 9 feet
occasionally to 11 feet.
LSZ162-101400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 AM EDT Thu Sep 10 2026 /315 AM CDT Thu Sep 10 2026/
.Today...
Weather.............Sunny.
Sfc winds...........Light and variable winds becoming south 5 to 10
knots in the afternoon.
100-ft winds........Light and variable winds becoming south 10 to
15 knots in the afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Partly 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 8 feet.
.FRIDAY NIGHT...
Weather.............Showers with a chance of thunderstorms.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ263-101400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 AM EDT Thu Sep 10 2026
.Today...
Weather.............Sunny.
Sfc winds...........West 5 to 10 knots becoming south in the
afternoon.
100-ft winds........West 10 to 15 knots becoming south in the
afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 5 to 10 knots increasing to 15 to 20
knots after midnight.
100-ft winds........South 10 to 15 knots increasing to 20 to 25
knots after midnight.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 6 feet after midnight.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.FRIDAY NIGHT...
Weather.............Showers likely with a chance of thunderstorms,
then showers with a chance of thunderstorms
after midnight.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ264-101400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 AM EDT Thu Sep 10 2026
.Today...
Weather.............Sunny.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
afternoon.
Ocnl waves..........Around 6 feet in the morning.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
showers with a chance of thunderstorms after
midnight.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ265-101400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 AM EDT Thu Sep 10 2026
.Today...
Weather.............Sunny.
Sfc winds...........Northwest 10 to 15 knots becoming west 5 to 10
knots in the afternoon.
100-ft winds........Northwest 15 to 20 knots becoming west 10 to 15
knots in the afternoon.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
afternoon.
Ocnl waves..........Around 6 feet in the morning.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 5 to 10 knots becoming south 10 to 15
knots after midnight.
100-ft winds........Northeast 10 to 15 knots becoming south 15 to
20 knots after midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with showers
likely after midnight.
Sfc winds...........South 20 to 25 knots.
100-ft winds........South to 30 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ266-101400-
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-
415 AM EDT Thu Sep 10 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds becoming south 10 to
15 knots after midnight.
100-ft winds........Light and variable winds becoming south 15 to
20 knots after midnight.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet after midnight.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
midnight.
Sfc winds...........South 20 to 25 knots.
100-ft winds........South to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ267-101400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 AM EDT Thu Sep 10 2026
.Today...
Weather.............Sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........8 to 12 feet subsiding to 5 to 7 feet in the
afternoon.
Ocnl waves..........Around 13 feet subsiding to around 8 feet in
the afternoon.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds becoming south 10 to
15 knots after midnight.
100-ft winds........Light and variable winds becoming south 15 to
20 knots after midnight.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 5 feet in the evening.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........South 20 to 25 knots.
100-ft winds........South to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. South winds 15 to 20 knots. Waves
6 to 9 feet.
.SUNDAY...North winds 10 to 15 knots. Waves 3 to 5 feet.
.MONDAY...Breezy. Chance of showers. showers likely. East winds
20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ261-101400-
MAFOR 1009/
Superior West 11710 11700 11500 12400 11410 11420 11530. Waves 2
feet or less.
Superior North Central 11720 11710 11700 11600 11510 12410 11420.
Waves 2 to 4 feet subsiding to 1 to 3 feet today. Waves 1 to 2
feet tonight.
Superior South Central 11730 11720 11710 11700 11100 11410 11420
11430. Waves 3 to 5 feet subsiding to 1 to 3 feet today. Waves 1
to 3 feet tonight.
Superior East 11730 11720 12710 11610 11500 11410 11420. Waves 5
to 8 feet subsiding to 2 to 4 feet today. Waves 1 to 3 feet
tonight.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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