FZUS63 KMQT 231415
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 AM EDT Wed Jul 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...30.2 inch high pressure slowly moves offshore today, while 29.8 to
29.9 inch troughing moves eastward across the rest of the lake today
into Thursday night. Weak 30.0 inch ridging builds back over the
Upper Great Lakes on Friday before weakening to 29.9 inches on
Saturday as a 29.6 inch low passes through far northern Ontario and
Hudson Bay. Broad, weak ridging over the Great Lakes basin builds
back to 30.0 inches for Sunday into next week.
LSZ162-232000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Wed Jul 23 2025 /902 AM CDT Wed Jul 23 2025/
.REST OF TODAY, South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering west late. Patchy fog by
late morning. A chance of showers and thunderstorms by late
morning, then showers and thunderstorms likely by mid afternoon.
Waves calm to 2 feet.
.TONIGHT, Southwest winds 5 to 15 knots veering northwest after
midnight. Patchy fog. Showers likely through midnight. A chance
of thunderstorms. A chance of showers after midnight. Waves calm
to 2 feet.
.THURSDAY, Northwest winds 5 to 15 knots backing southwest in
the afternoon. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT, West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.FRIDAY, South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT, East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY, South winds 5 to 15 knots veering west. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY, Southwest winds 5 to 15 knots veering north. A chance
of showers and thunderstorms. Waves calm to 2 feet.
LSZ162-232000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 AM EDT Wed Jul 23 2025 /915 AM CDT Wed Jul 23 2025/
.This Afternoon...
Weather.............Showers likely with possible thunderstorms and
fog, then showers and thunderstorms likely in
the afternoon.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Showers, thunderstorms likely and patchy fog,
then mostly cloudy with chance of showers with
possible thunderstorms and fog after midnight.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Partly sunny with patchy fog, then mostly sunny
in the afternoon.
Sfc winds...........North 5 to 10 knots becoming west in the
afternoon.
100-ft winds........North 10 to 15 knots becoming west in the
afternoon.
Sig waves...........2 feet or less.
.THURSDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ263-232000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 AM EDT Wed Jul 23 2025
.This Afternoon...
Weather.............Showers likely with possible thunderstorms and
fog.
Sfc winds...........Southeast 5 to 10 knots.
100-ft winds........Southeast 10 to 15 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Showers with possible thunderstorms and fog,
then showers likely with possible thunderstorms
and fog after midnight.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Partly sunny with patchy fog, then partly sunny
in the afternoon.
Sfc winds...........North 5 to 10 knots in the morning becoming
light and variable.
100-ft winds........North 10 to 15 knots in the morning becoming
light and variable.
Sig waves...........2 feet or less.
.THURSDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ264-232000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 AM EDT Wed Jul 23 2025
.This Afternoon...
Weather.............Showers, thunderstorms likely and patchy fog,
then showers likely with possible thunderstorms
and fog in the afternoon.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Showers likely with possible thunderstorms and
fog.
Sfc winds...........North 5 to 10 knots becoming west after
midnight.
100-ft winds........North 10 to 15 knots becoming west after
midnight.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Partly sunny with showers likely and patchy
fog, then partly sunny in the afternoon.
Sfc winds...........North 5 to 10 knots becoming west in the
afternoon.
100-ft winds........North 10 to 15 knots becoming west in the
afternoon.
Sig waves...........1 to 3 feet.
.THURSDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ265-232000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 AM EDT Wed Jul 23 2025
.This Afternoon...
Weather.............Showers likely with possible thunderstorms and
fog, then showers and thunderstorms likely in
the afternoon.
Sfc winds...........South 5 to 10 knots.
100-ft winds........South 10 to 15 knots.
Sig waves...........1 to 3 feet.
.TONIGHT...
Weather.............Showers likely with possible thunderstorms and
fog, then cloudy with chance of showers,
thunderstorms and patchy fog after midnight.
Sfc winds...........South 5 to 10 knots.
100-ft winds........South 10 to 15 knots.
Sig waves...........1 to 3 feet.
.THURSDAY...
Weather.............Mostly cloudy with chance of showers and patchy
fog, then partly sunny with chance of showers
in the afternoon.
Sfc winds...........Southwest 5 to 10 knots becoming northwest in
the afternoon.
100-ft winds........Southwest 10 to 15 knots becoming northwest in
the afternoon.
Sig waves...........2 feet or less.
.THURSDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 feet or less.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ266-232000-
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 AM EDT Wed Jul 23 2025
.This Afternoon...
Weather.............Showers likely with possible thunderstorms and
fog, then showers likely with a chance of
thunderstorms in the afternoon.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.TONIGHT...
Weather.............Showers likely with possible thunderstorms and
fog, then cloudy with chance of showers,
thunderstorms and patchy fog after midnight.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Mostly cloudy with chance of showers and patchy
fog, then partly sunny with chance of showers
in the afternoon.
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...........1 to 3 feet.
.THURSDAY NIGHT...
Weather.............Mostly 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...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ267-232000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 AM EDT Wed Jul 23 2025
.This Afternoon...
Weather.............Mostly cloudy with chance of showers and
thunderstorms, then mostly cloudy with showers
likely with a chance of thunderstorms in the
afternoon.
Sfc winds...........South 15 to 20 knots.
100-ft winds........South 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.TONIGHT...
Weather.............Showers with possible thunderstorms and fog,
then mostly cloudy with chance of showers,
thunderstorms with areas of dense fog after
midnight.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.THURSDAY...
Weather.............Mostly cloudy with chance of showers with areas
of dense fog, then mostly cloudy with chance of
showers in the afternoon.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 to 4 feet.
.THURSDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
mostly cloudy after midnight.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...Light and variable winds. Waves 2 to 4 feet.
.SATURDAY...East winds 5 to 10 knots. Waves 1 to 3 feet.
.SUNDAY...Chance of thunderstorms in the evening. chance of
showers. South winds 5 to 10 knots. Waves 1 to 3 feet.
$$
LSZ261-232000-
MAFOR 2315/
Superior West 11400 11506 11509 11606 11706 12700 11800. Waves 1
foot or less.
Superior North Central 11419 11410 11406 11506 12606 11706 11700.
Waves 2 feet or less.
Superior South Central 11416 11419 11416 11506 11606 12600 11700.
Waves 2 feet or less.
Superior East 12426 11419 12516 11514 11600 19604 11600. Waves 2
to 4 feet this afternoon. Waves 1 to 3 feet tonight and Thursday
morning.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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