FZUS63 KMQT 212015
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 PM EDT Tue Jul 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...Heights continue to rise over the lake this evening into tonight as
29.3 inch low pressure east of James Bay continues to track through
northern Quebec and ridging over the Northern Plains expands
eastward. The ridge over Lake Superior becomes maximized at 30.1
inches over the western lake on Wednesday before the high flattens
and moves east towards New England Thursday into Friday morning.
While ridging of around 30.0 inches looks to remain over Lake
Superior on Thursday, a weak 29.9 to 30.0 inch low could move over
the northwestern half of the lake by Thursday night into Friday
morning. As a low around 29.3 inches lifts from far northern Ontario
into Hudson Bay Friday night into Saturday morning, expect troughing
of around 29.8 inches to move into Lake Superior in response by
Saturday morning. Troughing of at least 29.8 inches looks to remain
over the lake for the rest of the day.
LSZ162-220800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Tue Jul 21 2026 /301 PM CDT Tue Jul 21 2026/
.LATE THIS AFTERNOON, North winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT, Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY, West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.WEDNESDAY NIGHT, Southwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY, Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY NIGHT, Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY, Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY NIGHT, Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY, Southwest winds 20 to 30 knots becoming north 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY, East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
LSZ162-220200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EDT Tue Jul 21 2026 /315 PM CDT Tue Jul 21 2026/
.Tonight...
Weather.............Partly cloudy.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY...
Weather.............Mostly sunny.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the afternoon.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ263-220200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 PM EDT Tue Jul 21 2026
.Tonight...
Weather.............Partly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet in the evening.
.WEDNESDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ264-220200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EDT Tue Jul 21 2026
.Tonight...
Weather.............Partly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........6 to 9 feet subsiding to 3 to 5 feet after
midnight.
Ocnl waves..........Around 10 feet subsiding to around 6 feet after
midnight.
.WEDNESDAY...
Weather.............Sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy with chance of showers.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ265-220200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EDT Tue Jul 21 2026
...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 20 to 25 knots.
100-ft winds........Northwest to 30 knots.
Sig waves...........8 to 12 feet subsiding to 5 to 7 feet after
midnight.
Ocnl waves..........Around 14 feet subsiding to around 8 feet after
midnight.
.WEDNESDAY...
Weather.............Sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 15 to 20 knots.
100-ft winds........Southwest 20 to 25 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ266-220200-
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 PM EDT Tue Jul 21 2026
...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 20 to 25 knots.
100-ft winds........Northwest to 30 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 13 feet.
.WEDNESDAY...
Weather.............Sunny.
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.
.WEDNESDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ267-220200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EDT Tue Jul 21 2026
...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest to 30 knots.
100-ft winds........Northwest gales to 35 knots.
Sig waves...........8 to 12 feet.
Ocnl waves..........Around 13 feet.
.WEDNESDAY...
Weather.............Sunny.
Sfc winds...........Northwest 20 to 25 knots.
100-ft winds........Northwest to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 15 to 20 knots.
100-ft winds........West 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.THURSDAY...
Weather.............Sunny.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 5 to 10 knots increasing to south 15
to 20 knots after midnight.
100-ft winds........Southwest 10 to 15 knots increasing to south 20
to 25 knots after midnight.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Chance of showers after midnight. South winds 10 to
15 knots. Waves 3 to 5 feet.
.SATURDAY...Chance of showers. South winds 10 to 15 knots. Waves
4 to 6 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ261-220200-
MAFOR 2121/
Superior West 11820 14710 11710 11610 11520. Waves 1 to 3 feet
subsiding to 1 foot or less tonight. Waves 2 feet or less
Wednesday.
Superior North Central 11740 11730 14720 11720 11620. Waves 4 to
7 feet subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet
Wednesday.
Superior South Central...GALE WARNING IN EFFECT...12750 14730
12720. Waves 6 to 9 feet subsiding to 3 to 5 feet tonight. Waves
2 to 4 feet subsiding to 1 to 3 feet Wednesday.
Superior East...GALE WARNING IN EFFECT...12740 15730. Waves 5 to
9 feet subsiding to 3 to 6 feet tonight. Waves 3 to 5 feet
Wednesday.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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