FZUS63 KMQT 152015
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 PM EDT Fri Aug 15 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...Weak troughing of 29.9 inches is digging into western Lake Superior
thanks to a 29.5 inch low pressure moving from northern Manitoba
into Ontario along Hudson Bay. Troughing weakens tonight as a 30.2
inch high builds across Manitoba. This high presses through Ontario
at 30.3 inches Sunday into Monday. Monday into Tuesday, a 29.9 inch
low may move through Wisconsin into Lower Michigan while 30.2. inch
ridging stretches across Quebec, Ontario, and Manitoba.
LSZ162-160800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Fri Aug 15 2025 /301 PM CDT Fri Aug 15 2025/
.LATE THIS AFTERNOON, Southwest winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT, Southwest winds 5 to 15 knots veering west after
midnight, then veering northeast late. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY, Northeast winds 10 to 20 knots veering east late. A
chance of showers and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.SATURDAY NIGHT, Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY, East winds 20 to 30 knots. A slight chance of showers.
Waves building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT, East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers. Waves subsiding to
2 to 4 feet.
.MONDAY, East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A chance of showers. Waves 2 to
4 feet.
.MONDAY NIGHT, Northeast winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet.
.TUESDAY, Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY, South winds 5 to 15 knots backing east. Waves calm
to 2 feet.
LSZ162-160200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EDT Fri Aug 15 2025 /315 PM CDT Fri Aug 15 2025/
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers
and thunderstorms, then mostly cloudy with
chance of showers and slight chance of
thunderstorms after midnight.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly cloudy with chance of showers and slight
chance of thunderstorms, then partly sunny with
a slight chance of showers and thunderstorms in
the afternoon.
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 NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SUNDAY...
Weather.............Partly sunny.
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.
.SUNDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ263-160200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 PM EDT Fri Aug 15 2025
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers
and thunderstorms, then mostly cloudy with
chance of showers and thunderstorms after
midnight.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Partly sunny with chance of showers and slight
chance of thunderstorms, then partly sunny with
a slight chance of showers and thunderstorms in
the afternoon.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........6 to 9 feet.
Ocnl waves..........Around 11 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
midnight.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ264-160200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EDT Fri Aug 15 2025
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers
and thunderstorms.
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 evening.
.SATURDAY...
Weather.............Partly sunny with a slight chance of showers
and thunderstorms.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........2 to 4 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 9 feet after
midnight.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ265-160200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EDT Fri Aug 15 2025
.Tonight...
Weather.............Mostly cloudy with a slight chance of showers
and thunderstorms, then mostly cloudy with
chance of showers and thunderstorms after
midnight.
Sfc winds...........Southeast 5 to 10 knots becoming south after
midnight.
100-ft winds........Southeast 10 to 15 knots becoming south after
midnight.
Sig waves...........1 to 3 feet.
.SATURDAY...
Weather.............Mostly cloudy with chance of showers and slight
chance of thunderstorms.
Sfc winds...........Northwest 10 to 15 knots becoming north in the
afternoon.
100-ft winds........Northwest 15 to 20 knots becoming north in the
afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
partly cloudy after midnight.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy, then chance of showers after
midnight.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet in the evening.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ266-160200-
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 Aug 15 2025
.Tonight...
Weather.............Partly cloudy with a slight chance of showers
and thunderstorms, then mostly cloudy with
chance of showers and thunderstorms after
midnight.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly cloudy with a slight chance of showers
and thunderstorms, then partly sunny with
chance of showers and slight chance of
thunderstorms in the afternoon.
Sfc winds...........West 10 to 15 knots becoming north in the
afternoon.
100-ft winds........West 15 to 20 knots becoming north in the
afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
partly cloudy 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.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
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.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ267-160200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EDT Fri Aug 15 2025
.Tonight...
Weather.............Partly cloudy, then mostly cloudy with chance
of showers and thunderstorms after midnight.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly cloudy with chance of showers,
thunderstorms and patchy fog, then mostly
cloudy with chance of showers and slight chance
of thunderstorms in the afternoon.
Sfc winds...........South 5 to 10 knots becoming northwest in the
afternoon.
100-ft winds........South 10 to 15 knots becoming northwest in the
afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
partly cloudy after midnight.
Sfc winds...........North 10 to 15 knots increasing to 20 to 25
knots after midnight.
100-ft winds........North 15 to 20 knots increasing to 30 knots
after midnight.
Sig waves...........2 to 4 feet building to 4 to 6 feet after
midnight.
Ocnl waves..........Around 8 feet after midnight.
.SUNDAY...
Weather.............Sunny.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SUNDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots becoming east 15 to 20
knots after midnight.
100-ft winds........Northeast 15 to 20 knots becoming east 20 to 25
knots after midnight.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 5 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Chance of showers. East winds 10 to 15 knots. Waves
4 to 6 feet.
.TUESDAY...Northeast winds 10 to 15 knots. Waves 3 to 5 feet.
.WEDNESDAY...North winds 5 to 10 knots. Waves 3 to 5 feet.
$$
LSZ261-160200-
MAFOR 1521/
Superior West 11510 11500 11600 11700 11110 13120. A chance of
showers and thunderstorms overnight. A chance of showers
Saturday. Waves 2 feet or less tonight. Waves 1 to 3 feet
building to 2 to 4 feet Saturday.
Superior North Central 11520 12510 11710 11810 12110 11820. Waves
2 to 4 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet
Saturday.
Superior South Central 11310 11400 11500 11600 11700 11810 11110
11820. A chance of showers and thunderstorms overnight. A chance
of showers Saturday. Waves 2 feet or less.
Superior East 12420 12510 11600 11700 11800 11810. A chance of
showers and thunderstorms overnight. A chance of showers and
thunderstorms Saturday morning, then a chance of showers Saturday
afternoon. Waves 1 to 3 feet.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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