Critical fire weather conditions will persist in the central High Plains through Friday as gusty winds and dry conditions continue. The heat wave across the West and Southwest will continue to intensify through the week, with daily and monthly record highs expected to be broken. Read More >
FZUS63 KMQT 190815
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 AM EDT Thu Mar 19 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 29.8 inch Clipper low over northern Ontario lifts towards James
Bay by morning. Behind this low, weak ridging of around 30.1 inches
builds over Lake Superior on today ahead of another Clipper low
moving through the lake Thursday night into early Friday at around
29.8 inches. While another low moves through northern Ontario
towards the north short of Lake Superior Friday night, another low
stretches into the Northern Plains around the same time. Together,
these lows are expected to bring about troughing of around around
29.8 inch over Lake Superior on Saturday into Sunday. Behind the
troughing, 30.4 inch ridging builds into the Great Lakes and
Northern Plains by Monday.
LSZ162-192000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Thu Mar 19 2026 /300 AM CDT Thu Mar 19 2026/
.EARLY THIS MORNING, North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY, Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of rain and snow showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT, East winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then veering west late. A chance of snow
and rain showers through midnight. Waves calm to 2 feet.
.FRIDAY, West winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves calm to 2 feet.
.FRIDAY NIGHT, West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY, Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of snow showers, possibly
mixed with rain. Waves building to 2 to 4 feet.
.SATURDAY NIGHT, Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY, Northeast winds 15 to 25 knots becoming northwest 5 to
15 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to calm to 2 feet.
.MONDAY, Southwest winds 5 to 15 knots increasing to 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
LSZ162-191400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 AM EDT Thu Mar 19 2026 /315 AM CDT Thu Mar 19 2026/
.Today...
Weather.............Partly sunny.
Sfc winds...........North 5 to 10 knots becoming east in the
afternoon.
100-ft winds........North 10 to 15 knots becoming east in the
afternoon.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of snow showers and
slight chance of showers, then mostly cloudy
with chance of light freezing rain after
midnight.
Sfc winds...........East 5 to 10 knots becoming south 10 to 15
knots after midnight.
100-ft winds........East 10 to 15 knots becoming south 15 to 20
knots after midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........Southwest 5 to 10 knots becoming northwest in
the afternoon.
100-ft winds........Southwest 10 to 15 knots becoming northwest in
the afternoon.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
Wave heights are for ice free areas.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 6 to 9 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 8 to 12 feet.
$$
LSZ263-191400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 AM EDT Thu Mar 19 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of showers, snow
showers and slight chance of light freezing
rain, then mostly cloudy with chance of showers
and slight chance of light freezing rain after
midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........Southwest 10 to 15 knots becoming northwest in
the afternoon.
100-ft winds........Southwest 15 to 20 knots becoming northwest in
the afternoon.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Wave heights are for ice free areas.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 6 to 9 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 8 to 12 feet.
$$
LSZ264-191400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 AM EDT Thu Mar 19 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Snow showers and slight chance of freezing
rain, then snow showers with a chance of
showers after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........West 10 to 15 knots becoming northwest in the
afternoon.
100-ft winds........West 15 to 20 knots becoming northwest in the
afternoon.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 5 to 7 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 6 to 9 feet.
$$
LSZ265-191400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 AM EDT Thu Mar 19 2026
.Today...
Weather.............Partly sunny.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Rain and snow showers likely, then chance of
rain and snow showers likely after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........West 10 to 15 knots becoming northwest in the
afternoon.
100-ft winds........West 15 to 20 knots becoming northwest in the
afternoon.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
Wave heights are for ice free areas.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 6 to 9 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 8 to 12 feet.
$$
LSZ266-191400-
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 Mar 19 2026
.Today...
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.
.TONIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
snow showers with a chance of showers after
midnight.
Sfc winds...........Southeast 10 to 15 knots increasing to south 20
to 25 knots after midnight.
100-ft winds........Southeast 15 to 20 knots increasing to south to
30 knots after midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........South 15 to 20 knots becoming northwest 10 to
15 knots in the afternoon.
100-ft winds........South 20 to 25 knots becoming northwest 15 to
20 knots in the afternoon.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 5 to 7 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 6 to 9 feet.
$$
LSZ267-191400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 AM EDT Thu Mar 19 2026
.Today...
Weather.............Mostly sunny.
Sfc winds...........Northwest 15 to 20 knots decreasing to 5 to 10
knots in the afternoon.
100-ft winds........Northwest 20 to 25 knots decreasing to 10 to 15
knots in the afternoon.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of snow showers, then
mostly cloudy with snow showers, slight chance
of showers and freezing rain after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 6 feet after midnight.
.FRIDAY...
Weather.............Mostly cloudy with chance of showers, snow
showers and light freezing rain, then partly
sunny in the afternoon.
Sfc winds...........South 10 to 15 knots becoming northwest in the
afternoon.
100-ft winds........South 15 to 20 knots becoming northwest in the
afternoon.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
Wave heights are for ice free areas.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...Slight chance of snow showers in the morning. chance
of snow showers. West winds 10 to 15 knots. Waves 6 to 9 feet.
.SUNDAY...Breezy. Freezing spray in the morning. Chance of snow
showers in the morning. North winds 20 to 25 knots. Waves 8 to
12 feet.
.MONDAY...North winds 10 to 15 knots. Waves 8 to 12 feet.
$$
LSZ261-191400-
MAFOR 1909/
Superior West 11800 11100 11200 11300 11200 11310 12510. A chance
of snow showers this evening. Waves 2 feet or less.
Superior North Central 12810 11800 11300 11310 11327 11427 11520.
A chance of rain showers overnight. Waves 1 to 3 feet subsiding
to 1 foot or less today. Waves 1 to 2 feet building to 3 to 5
feet tonight.
Superior South Central 11720 11820 11810 11300 11310 11320 11437
11430. Waves 1 to 3 feet today. Waves 1 to 2 feet building to 3
to 5 feet tonight.
Superior East 11720 11820 11710 11600 11400 11310 11327 11437.
Waves 2 to 4 feet subsiding to 1 to 2 feet today. Waves 1 to 2
feet building to 3 to 5 feet tonight.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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