FZUS63 KMQT 210815
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 AM EDT Thu May 21 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...A 30.4 inch high pressure remains over Lake Superior before shifting
east through Friday into New England and Quebec. Meanwhile, a 29.7
inch low develops over the Plains and lifts toward the Great Lakes.
The low gradually weakens to 29.9 inches as it lifts over Lower
Michigan and the eastern Great Lakes Saturday into Sunday. Weak
troughing of 30.0 inches passes northward over Lake Superior
Saturday night into Sunday before ridging of around 30.0 inches
returns on Monday.
LSZ162-212000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Thu May 21 2026 /300 AM CDT Thu May 21 2026/
.EARLY THIS MORNING, Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY, East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.TONIGHT, Northeast winds 5 to 15 knots veering east late. Waves
subsiding to calm to 2 feet.
.FRIDAY, East winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT, East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY, East winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. Rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT, Northeast winds 5 to 15 knots becoming west
less than 10 knots after midnight. Waves subsiding to calm to
2 feet.
.SUNDAY, Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY, East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
LSZ162-211400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 AM EDT Thu May 21 2026 /315 AM CDT Thu May 21 2026/
.Today...
Weather.............Sunny.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the evening.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots increasing to 15 to 20
knots in the afternoon.
100-ft winds........Northeast 10 to 15 knots increasing to 20 to 25
knots in the afternoon.
Sig waves...........2 to 4 feet building to 4 to 6 feet in the
afternoon.
Ocnl waves..........Around 8 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
midnight.
Sfc winds...........Northeast 20 to 25 knots decreasing to 10 to 15
knots after midnight.
100-ft winds........Northeast to 30 knots decreasing to 15 to 20
knots after midnight.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ263-211400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 AM EDT Thu May 21 2026
.Today...
Weather.............Sunny.
Sfc winds...........Southeast 5 to 10 knots becoming northeast in
the afternoon.
100-ft winds........Southeast 10 to 15 knots becoming northeast in
the afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 5 to 10 knots increasing to northeast
15 to 20 knots in the afternoon.
100-ft winds........Southeast 10 to 15 knots increasing to
northeast 20 to 25 knots in the afternoon.
Sig waves...........2 to 4 feet building to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 7 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with chance
of showers after midnight.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ264-211400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 AM EDT Thu May 21 2026
.Today...
Weather.............Sunny.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........East 10 to 15 knots becoming southeast after
midnight.
100-ft winds........East 15 to 20 knots becoming southeast after
midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 10 to 15 knots becoming east in the
afternoon.
100-ft winds........Southeast 15 to 20 knots becoming east in the
afternoon.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ265-211400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 AM EDT Thu May 21 2026
.Today...
Weather.............Sunny.
Sfc winds...........South 5 to 10 knots becoming east 10 to 15
knots in the afternoon.
100-ft winds........South 10 to 15 knots becoming east 15 to 20
knots in the afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet building to 4 to 6 feet in the
afternoon.
Ocnl waves..........Around 7 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ266-211400-
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 May 21 2026
.Today...
Weather.............Sunny.
Sfc winds...........South 5 to 10 knots becoming east in the
afternoon.
100-ft winds........South 10 to 15 knots becoming east in the
afternoon.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 10 to 15 knots becoming southeast
after midnight.
100-ft winds........Northeast 15 to 20 knots becoming southeast
after midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 5 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 7 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ267-211400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 AM EDT Thu May 21 2026
.Today...
Weather.............Sunny.
Sfc winds...........Light and variable winds becoming northeast 5
to 10 knots in the afternoon.
100-ft winds........Light and variable winds becoming northeast 10
to 15 knots in the afternoon.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 10 to 15 knots becoming southeast 5
to 10 knots after midnight.
100-ft winds........Northeast 15 to 20 knots becoming southeast 10
to 15 knots after midnight.
Sig waves...........1 to 3 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ261-211400-
MAFOR 2109/
Superior West 12300 11200 12110 12210 11310. Waves 2 feet or less
today. Waves 1 to 3 feet tonight.
Superior North Central 13400 14310 11410. Waves 2 feet or less.
Superior South Central 12400 11310 12210 11320 11310 11300. Waves
2 feet or less today. Waves 1 to 3 feet tonight.
Superior East 11500 12300 13200 12300. Waves 1 foot or less.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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