FZUS63 KMQT 240215
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 PM EDT Sun Mar 23 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...29.4 inch low pressure over northern Lake Michigan
tonight will slowly track through the Upper Great Lakes Monday
before leaving for the St. Lawrence Seaway Tuesday. Ridging of
30.1 inches returns over Lake Superior Tuesday, building to 30.2
inches Wednesday. A 29.9 inch low in northern Ontario Wednesday
night heads to Quebec Thursday evening as a 30.4 inch high
pressure moves into northern Manitoba. The high brings ridging of
at least 30.2 inches over Lake Superior by Friday.
LSZ162-240945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EDT Sun Mar 23 2025 /845 PM CDT Sun Mar 23 2025/
.REST OF TONIGHT, East winds 15 to 25 knots backing north after
midnight, then increasing to 20 to 30 knots late. Snow, possibly
mixed with rain by late evening, then a chance of snow after
midnight. Waves 3 to 5 feet occasionally to 7 feet subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.MONDAY, North winds 15 to 25 knots backing northwest in the
afternoon, then diminishing to 10 to 20 knots late. A chance of
snow through early afternoon. Waves subsiding to 1 to 3 feet.
.MONDAY NIGHT, North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.TUESDAY, North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT, Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY, West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT, West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY, Northwest winds 10 to 20 knots veering east. Waves
building to 1 to 3 feet.
.FRIDAY, East winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of snow showers, then rain and snow showers likely.
Waves building to 5 to 8 feet occasionally to 10 feet.
LSZ162-240800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 PM EDT Sun Mar 23 2025 /915 PM CDT Sun Mar 23 2025/
.Overnight...
Weather.............Snow and slight chance of rain, then cloudy
with chance of snow 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 8 feet.
.MONDAY...
Weather.............Mostly cloudy with chance of snow showers, then
mostly sunny in the afternoon.
Sfc winds...........North 20 to 25 knots becoming northwest 10 to
15 knots in the afternoon.
100-ft winds........North to 30 knots becoming northwest 15 to 20
knots in the afternoon.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.MONDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots becoming north after
midnight.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 5 feet in the evening.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........1 to 3 feet.
.TUESDAY NIGHT...
Weather.............Partly cloudy.
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...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ263-240800-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 PM EDT Sun Mar 23 2025
.Overnight...
Weather.............Snow, then snow likely after midnight.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 13 feet.
.MONDAY...
Weather.............Snow, then partly sunny with chance of snow
showers in the afternoon.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.MONDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots becoming north 15 to
20 knots after midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the morning.
.TUESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 5 to 10 knots.
100-ft winds........South 10 to 15 knots.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ264-240800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 PM EDT Sun Mar 23 2025
.Overnight...
Weather.............Snow.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 16 feet.
.MONDAY...
Weather.............Snow showers, then cloudy with chance of snow
showers in the afternoon.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.
.MONDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.TUESDAY...
Weather.............Partly sunny.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
afternoon.
Ocnl waves..........Around 7 feet subsiding to around 5 feet in the
afternoon.
.TUESDAY NIGHT...
Weather.............Partly 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...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ265-240800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 PM EDT Sun Mar 23 2025
.Overnight...
Weather.............Snow.
Sfc winds...........East 20 to 25 knots.
100-ft winds........East to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.
.MONDAY...
Weather.............Snow showers, then cloudy with chance of snow
showers in the afternoon.
Sfc winds...........Northeast 15 to 20 knots becoming north 20 to
25 knots in the afternoon.
100-ft winds........Northeast 20 to 25 knots becoming north to 30
knots in the afternoon.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.MONDAY NIGHT...
Weather.............Mostly cloudy with chance of snow showers.
Sfc winds...........Northwest 20 to 25 knots.
100-ft winds........Northwest to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.TUESDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........5 to 7 feet subsiding to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 8 feet subsiding to around 5 feet in the
afternoon.
.TUESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northwest 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........Northwest 10 to 15 knots in the evening
becoming light and variable.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ266-240800-
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 Sun Mar 23 2025
...GALE WARNING IN EFFECT UNTIL 1 AM EDT MONDAY...
.Overnight...
Weather.............Snow likely, then snow after midnight.
Sfc winds...........Southeast to 30 knots.
100-ft winds........Southeast gales to 35 knots.
Sig waves...........10 to 14 feet.
Ocnl waves..........Around 17 feet.
.MONDAY...
Weather.............Snow showers, then snow showers likely in the
afternoon.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.
.MONDAY NIGHT...
Weather.............Cloudy with snow showers likely, then cloudy
with chance of snow showers after midnight.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 12 feet.
.TUESDAY...
Weather.............Mostly cloudy.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........5 to 7 feet subsiding to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 9 feet subsiding to around 6 feet in the
afternoon.
.TUESDAY NIGHT...
Weather.............Partly 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...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ267-240800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 PM EDT Sun Mar 23 2025
...GALE WARNING IN EFFECT UNTIL 1 AM EDT MONDAY...
.Overnight...
Weather.............Cloudy with chance of snow, then snow after
midnight.
Sfc winds...........Southeast gales to 35 knots decreasing to 30
knots after midnight.
100-ft winds........Southeast gales to 45 knots decreasing to 35
knots after midnight.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 15 feet.
.MONDAY...
Weather.............Snow, then mostly cloudy with chance of snow
showers in the afternoon.
Sfc winds...........East 15 to 20 knots becoming north in the
afternoon.
100-ft winds........East 20 to 25 knots becoming north in the
afternoon.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.MONDAY NIGHT...
Weather.............Cloudy with chance of snow showers.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 10 feet.
.TUESDAY...
Weather.............Mostly cloudy with chance of snow showers.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.TUESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...Northwest winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Southwest winds 10 to 15 knots. Waves 4 to 6 feet.
.FRIDAY...Chance of snow showers in the evening. showers likely
with a chance of light freezing rain. snow showers likely after
midnight. Northeast winds 15 to 20 knots. Waves 6 to 9 feet.
$$
LSZ261-240800-
MAFOR 2403/
Superior West 11127 11830 12840 11730 12720 11820. A chance of
snow showers Monday morning. Waves 2 to 4 feet building to 3 to 5
feet overnight. Waves 4 to 7 feet subsiding to 3 to 5 feet
Monday. Waves 2 to 4 feet Monday evening.
Superior North Central 11347 11237 11127 12847 11830 11837 11830.
Waves 7 to 10 feet overnight. Waves 5 to 8 feet Monday and Monday
evening.
Superior South Central...GALE WARNING IN EFFECT...11347 11237
11137 12837 11840 11747 11737. Waves 5 to 8 feet.
Superior East...GALE WARNING IN EFFECT...11357 11247 11237 11137
12830 12837. Waves 8 to 11 feet subsiding to 6 to 9 feet
overnight. Waves 3 to 6 feet Monday. Waves 4 to 7 feet Monday
evening.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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