FZUS63 KMQT 211415
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 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 today 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-
1000 AM EDT Thu May 21 2026 /900 AM CDT Thu May 21 2026/
.REST OF TODAY, East winds 5 to 15 knots becoming northeast
10 to 20 knots late. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT, Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then 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.
LSZ162-212000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 AM EDT Thu May 21 2026 /915 AM CDT Thu May 21 2026/
.This Afternoon...
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...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 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.
$$
LSZ263-212000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 AM EDT Thu May 21 2026
.This Afternoon...
Weather.............Sunny.
Sfc winds...........East 5 to 10 knots becoming northeast in the
afternoon.
100-ft winds........East 10 to 15 knots becoming northeast in the
afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........East 5 to 10 knots increasing to northeast 15
to 20 knots in the afternoon.
100-ft winds........East 10 to 15 knots increasing to northeast 20
to 25 knots in the afternoon.
Sig waves...........2 to 4 feet building to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 7 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with chance
of showers after midnight.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ264-212000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 AM EDT Thu May 21 2026
.This Afternoon...
Weather.............Sunny.
Sfc winds...........Southeast 5 to 10 knots.
100-ft winds........Southeast 10 to 15 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.
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 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.
$$
LSZ265-212000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 AM EDT Thu May 21 2026
.This Afternoon...
Weather.............Sunny.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........East 10 to 15 knots becoming southeast after
midnight.
100-ft winds........East 15 to 20 knots becoming southeast after
midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet building to 4 to 6 feet in the
afternoon.
Ocnl waves..........Around 7 feet in the afternoon.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ266-212000-
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 AM EDT Thu May 21 2026
.This Afternoon...
Weather.............Sunny.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
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...........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.
$$
LSZ267-212000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 AM EDT Thu May 21 2026
.This Afternoon...
Weather.............Sunny.
Sfc winds...........Light and variable winds becoming northeast 5
to 10 knots in the afternoon.
100-ft winds........Light and variable winds becoming northeast 10
to 15 knots in the afternoon.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........North 10 to 15 knots becoming southeast 5 to 10
knots after midnight.
100-ft winds........North 15 to 20 knots becoming southeast 10 to
15 knots after midnight.
Sig waves...........1 to 3 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 6 feet after
midnight.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
.MONDAY...South winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ261-212000-
MAFOR 2115/
Superior West 11200 12110 12210 11310 11200 11210. Waves 2 feet
or less this afternoon. Waves 1 to 3 feet tonight and Friday
morning.
Superior North Central 11400 14310 11410 11300 11310. Waves 2
feet or less.
Superior South Central 11310 12210 11320 11310 12300 11310. Waves
2 feet or less this afternoon. Waves 1 to 3 feet tonight and
Friday morning.
Superior East 11300 12100 11200 14300. Waves 1 foot or less.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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