FZUS63 KMQT 230215
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 PM EDT Thu May 22 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 29.7 inch low located over Lake Ontario dwindles to
29.8 inches by Friday as it phases with another low moving into
Maine. In response, ridging over Lake Superior increases to 30.3
inches by Saturday and remains near that strength through the rest
of the weekend into Tuesday night next week.
LSZ162-230800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Thu May 22 2025 /901 PM CDT Thu May 22 2025/
.REST OF TONIGHT, Northwest winds 5 to 15 knots veering north
after midnight. Sprinkles. Waves calm to 2 feet.
.FRIDAY, North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Sprinkles. Waves calm to
2 feet.
.FRIDAY NIGHT, West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.SATURDAY, North winds 5 to 15 knots veering south by mid
afternoon. A slight chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT, East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SUNDAY, North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT, Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY, Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY, Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
LSZ162-230800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 PM EDT Thu May 22 2025 /915 PM CDT Thu May 22 2025/
.Overnight...
Weather.............Mostly cloudy with a slight chance of
sprinkles, then mostly cloudy after midnight.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Partly sunny, then slight chance of sprinkles
in the afternoon.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........1 to 3 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.SATURDAY 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...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ263-230800-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 PM EDT Thu May 22 2025
.Overnight...
Weather.............Mostly cloudy with a slight chance of showers,
then mostly cloudy with a slight chance of
sprinkles after midnight.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly cloudy with a slight chance of
sprinkles.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........North 5 to 10 knots becoming northwest after
midnight.
100-ft winds........North 10 to 15 knots becoming northwest after
midnight.
Sig waves...........1 to 3 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........North 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........North 10 to 15 knots in the morning becoming
light and variable.
Sig waves...........1 to 3 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ264-230800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 PM EDT Thu May 22 2025
.Overnight...
Weather.............Cloudy with a slight chance of showers.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FRIDAY...
Weather.............Mostly cloudy with a slight chance of
sprinkles.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny in the morning.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........1 to 3 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ265-230800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 PM EDT Thu May 22 2025
.Overnight...
Weather.............Cloudy with a slight chance of showers.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY...
Weather.............Cloudy with a slight chance of showers, then
mostly cloudy with a slight chance of sprinkles
in the afternoon.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet in the evening.
.SATURDAY...
Weather.............Mostly sunny in the morning.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ266-230800-
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 Thu May 22 2025
.Overnight...
Weather.............Mostly cloudy with a slight chance of showers,
then cloudy with chance of showers after
midnight.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY...
Weather.............Mostly cloudy with chance of showers, then
mostly cloudy with a slight chance of showers
in the afternoon.
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.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY...
Weather.............Mostly sunny in the morning.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ267-230800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 PM EDT Thu May 22 2025
.Overnight...
Weather.............Cloudy with chance of showers.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY...
Weather.............Cloudy with chance of showers.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
mostly cloudy after midnight.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.TUESDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
$$
LSZ261-230800-
MAFOR 2303/
Superior West 14800 11700 12500 11600. Waves 1 foot or less.
Superior North Central 14820 11820 13810. Waves 2 to 4 feet
overnight and Friday. Waves 1 to 2 feet Friday evening.
Superior South Central 13820 14720 11710. A chance of rain
showers Friday morning. Waves 2 to 4 feet overnight. Waves 3 to 5
feet Friday. Waves 2 to 4 feet subsiding to 1 to 3 feet Friday
evening.
Superior East 15820 11820 11810. A chance of rain showers
overnight, Friday morning, and Friday evening. Waves 2 to 4 feet.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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