FZUS63 KMQT 042015
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 PM EDT Fri Sep 4 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...High pressure ridging builds to 30.1 inches over Lake Superior by
Saturday afternoon, remaining through Sunday night. The ridge
briefly builds further to 30.2 inches on Monday as a 30.4 inch high
passes eastward over far northern Ontario. Meanwhile, a 29.6 inch
low develops off the northern Rockies. The low then tracks northeast
to James Bay, deepening to 29.3 inches by Wednesday afternoon. This
sends a 29.7 inch trough over Lake Superior Tuesday night and
Wednesday.
LSZ162-050800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Fri Sep 4 2026 /301 PM CDT Fri Sep 4 2026/
.LATE THIS AFTERNOON, Northeast winds 15 to 25 knots. A slight
chance of showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT, Northeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Patchy fog after midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY, Northeast winds 10 to 20 knots. Patchy fog through
early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT, Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY, East winds 5 to 15 knots backing northeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.SUNDAY NIGHT, Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY, East winds 10 to 20 knots increasing to gales to
35 knots by mid afternoon. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT, East gales to 35 knots becoming southeast 20 to
30 knots after midnight. Showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY, South winds 20 to 30 knots veering west. A chance of
showers and thunderstorms. Waves subsiding to 1 to 3 feet.
.WEDNESDAY, West gales to 40 knots becoming northwest 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
LSZ162-050200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EDT Fri Sep 4 2026 /315 PM CDT Fri Sep 4 2026/
.Tonight...
Weather.............Mostly cloudy, then patchy fog after midnight.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY...
Weather.............Partly sunny with patchy fog, then mostly sunny
in the afternoon.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY 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.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........Northeast 10 to 15 knots in the morning
becoming light and variable.
Sig waves...........1 to 3 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ263-050200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 PM EDT Fri Sep 4 2026
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers,
then mostly cloudy with patchy fog after
midnight.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........Northeast 10 to 15 knots in the morning
becoming light and variable.
Sig waves...........2 feet or less.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ264-050200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EDT Fri Sep 4 2026
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Light and variable winds becoming southeast 5
to 10 knots in the afternoon.
100-ft winds........Light and variable winds becoming southeast 10
to 15 knots in the afternoon.
Sig waves...........2 feet or less.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 5 to 10 knots.
100-ft winds........East 10 to 15 knots.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ265-050200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EDT Fri Sep 4 2026
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet in the evening.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........Northeast 10 to 15 knots in the evening
becoming light and variable.
Sig waves...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Light and variable winds becoming east 5 to 10
knots in the afternoon.
100-ft winds........Light and variable winds becoming east 10 to 15
knots in the afternoon.
Sig waves...........2 feet or less.
.SUNDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ266-050200-
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 Fri Sep 4 2026
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........North 10 to 15 knots in the evening becoming
light and variable.
Sig waves...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 5 to 10 knots becoming southeast after
midnight.
100-ft winds........East 10 to 15 knots becoming southeast after
midnight.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ267-050200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EDT Fri Sep 4 2026
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Sunny.
Sfc winds...........East 10 to 15 knots becoming north 5 to 10
knots in the afternoon.
100-ft winds........East 15 to 20 knots becoming north 10 to 15
knots in the afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........2 feet or less.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.SUNDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 5 to 10 knots becoming southeast
after midnight.
100-ft winds........Northeast 10 to 15 knots becoming southeast
after midnight.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Slight chance of showers in the morning. chance of
showers. Northeast winds 5 to 10 knots. Waves 5 to 7 feet.
.TUESDAY...Showers. chance of showers. East winds 15 to 20 knots.
Waves 8 to 12 feet.
.WEDNESDAY...Breezy. Chance of showers in the morning. South
winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ261-050200-
MAFOR 0421/
Superior West 11140 11130 12120 14110. Waves 3 to 5 feet
subsiding to 2 to 3 feet tonight. Waves 1 to 2 feet Saturday.
Superior North Central 11220 11110 14100 12200. Waves 1 to 3
feet.
Superior South Central 11220 12210 11100 11110 13210. Waves 1 to
3 feet.
Superior East 11110 12100 13210 12100. Waves 2 feet or less.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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