FZUS63 KMQT 200816
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
416 AM EDT Wed May 20 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 30.3 inch high over the Northern Plains shifts over Lake Superior
today and builds to 30.4 inches tonight. The high pressure shifts
east Thursday night while leaving lingering ridging of at least 30.3
inches over Lake Superior through Friday. A 29.9 inch low then lifts
into the Lower Great Lakes from the Southern Plains Friday night and
Saturday, but 30.1 inch ridging persists over Lake Superior the
remainder of the weekend.
LSZ162-202000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
356 AM EDT Wed May 20 2026 /256 AM CDT Wed May 20 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, Southeast winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.THURSDAY, East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT, Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY, East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT, Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY, Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.SUNDAY, Southwest winds 5 to 15 knots. Waves calm to 2 feet.
LSZ162-201400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
416 AM EDT Wed May 20 2026 /316 AM CDT Wed May 20 2026/
.Today...
Weather.............Mostly 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...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........East 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........East 10 to 15 knots in the evening becoming
light and variable.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Mostly 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.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.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.
$$
LSZ263-201400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
416 AM EDT Wed May 20 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 5 to 10 knots becoming south in the
afternoon.
100-ft winds........Northwest 10 to 15 knots becoming south in the
afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Southeast 5 to 10 knots.
100-ft winds........Southeast 10 to 15 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 5 to 10 knots becoming east in the
afternoon.
100-ft winds........Southeast 10 to 15 knots becoming east in the
afternoon.
Sig waves...........1 to 3 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ264-201400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
416 AM EDT Wed May 20 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 5 to 10 knots becoming west in the
afternoon.
100-ft winds........Northwest 10 to 15 knots becoming west in the
afternoon.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the morning.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Mostly sunny.
Sfc winds...........South 5 to 10 knots.
100-ft winds........South 10 to 15 knots.
Sig waves...........1 to 3 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.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.
$$
LSZ265-201400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
416 AM EDT Wed May 20 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the morning.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........South 5 to 10 knots becoming east 10 to 15
knots in the afternoon.
100-ft winds........South 10 to 15 knots becoming east 15 to 20
knots in the afternoon.
Sig waves...........2 to 4 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ266-201400-
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-
416 AM EDT Wed May 20 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 to 4 feet.
.THURSDAY...
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.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
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.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.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.
$$
LSZ267-201400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
416 AM EDT Wed May 20 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.TONIGHT...
Weather.............Mostly clear.
Sfc winds...........West 10 to 15 knots in the evening becoming
light and variable.
100-ft winds........West 15 to 20 knots in the evening becoming
light and variable.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 5 feet in the evening.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Light and variable winds becoming northeast 5
to 10 knots in the afternoon.
100-ft winds........Light and variable winds becoming northeast 10
to 15 knots in the afternoon.
Sig waves...........1 to 3 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming southeast
after midnight.
100-ft winds........Northeast 10 to 15 knots becoming southeast
after midnight.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Northeast winds 10 to 15 knots. Waves 5 to 7 feet.
.SATURDAY...Chance of showers. Northeast winds 10 to 15 knots.
Waves 8 to 12 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ261-201400-
MAFOR 2009/
Superior West 12700 11500 11410 11400 13300. Waves 1 foot or
less.
Superior North Central 13710 11500 12510 12400. Waves 1 to 3 feet
today. Waves 1 foot or less tonight.
Superior South Central 11720 12710 11800 11300 13400. Waves 2 to
4 feet subsiding to 1 to 3 feet today. Waves 1 foot or less
tonight.
Superior East 11730 13720 11610 11710 11700 11200. Waves 4 to 7
feet subsiding to 2 to 3 feet today. Waves 1 to 3 feet subsiding
to 1 foot or less tonight.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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