A storm system near the Hawaiian Islands is expected to bring periods of heavy rainfall, strong winds, and isolated strong to severe thunderstorms through Friday. Several rounds of severe thunderstorms are forecast to impact parts of the Great Plains into the Midwest this weekend into next week. Moderate to heavy rainfall and high elevation snow is expected this weekend over California and Oregon. Read More >
FZUS63 KMQT 100215
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 PM EDT Thu Apr 9 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 30.2 inch high pressure over the Northern Plains builds into the
Upper Great Lakes through tonight. The high builds to 30.5 inches
over the Lower Great Lakes by Saturday. On Sunday, a 29.3 inch low
pressure lifts through the Northern Plains while the 30.5 inch high
pushes off of the Eastern Seaboard into the Atlantic. This low
pushes east through the Upper Great Lakes Sunday night before
continuing into northern Quebec Monday. Another low will take shape
over the Central Plains on Monday, deepening to 29.5 inches on
Tuesday with a weak 29.8 inch trough extending through the Upper
Great Lakes.
LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Thu Apr 9 2026 /900 PM CDT Thu Apr 9 2026/
.REST OF TONIGHT, Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY, West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.FRIDAY NIGHT, Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.SATURDAY, South winds 5 to 15 knots backing east by mid
afternoon. A slight chance of rain showers, possibly mixed with
snow by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT, East winds 10 to 20 knots. Rain showers and a
slight chance of thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY, East winds 10 to 20 knots backing northeast by mid
afternoon. Rain showers. A chance of thunderstorms by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT, West winds 10 to 20 knots. Rain showers likely
through midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.MONDAY, East winds 5 to 15 knots becoming northeast 20 to
30 knots. Rain showers likely. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY, Northeast winds 20 to 30 knots. A chance of rain
showers, possibly mixed with snow. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 7 to 10 feet
occasionally to 13 feet.
LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 PM EDT Thu Apr 9 2026 /915 PM CDT Thu Apr 9 2026/
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........1 to 3 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........West 5 to 10 knots becoming southwest in the
afternoon.
100-ft winds........West 10 to 15 knots becoming southwest in the
afternoon.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........South 10 to 15 knots in the evening becoming
light and variable.
Sig waves...........2 to 4 feet.
.SATURDAY...
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.
.SATURDAY NIGHT...
Weather.............Showers.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 6 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 8 to 12 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 6 to 9 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 6 to 9 feet.
$$
LSZ263-100800-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 PM EDT Thu Apr 9 2026
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet late in the evening.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........South 5 to 10 knots.
100-ft winds........South 10 to 15 knots.
Sig waves...........1 to 3 feet.
.SATURDAY NIGHT...
Weather.............Showers likely, then showers after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 7 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 8 to 12 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 6 to 9 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 6 to 9 feet.
$$
LSZ264-100800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 PM EDT Thu Apr 9 2026
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots late in the evening becoming
light and variable.
100-ft winds........West 10 to 15 knots late in the evening
becoming light and variable.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 6 feet subsiding to around 5 feet after
midnight.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY 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.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........1 to 3 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 9 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 8 to 12 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 6 to 9 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 6 to 9 feet.
$$
LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 PM EDT Thu Apr 9 2026
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........1 to 3 feet.
.FRIDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 5 to 10 knots becoming southwest after
midnight.
100-ft winds........West 10 to 15 knots becoming southwest after
midnight.
Sig waves...........1 to 3 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Southwest 5 to 10 knots becoming south in the
afternoon.
100-ft winds........Southwest 10 to 15 knots becoming south in the
afternoon.
Sig waves...........1 to 3 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
cloudy with showers after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 9 feet after
midnight.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 8 to 12 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 6 to 9 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 6 to 9 feet.
$$
LSZ266-100800-
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 PM EDT Thu Apr 9 2026
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots.
100-ft winds........West 10 to 15 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........West 10 to 15 knots becoming southwest after
midnight.
100-ft winds........West 15 to 20 knots becoming southwest after
midnight.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Southwest 5 to 10 knots becoming south in the
afternoon.
100-ft winds........Southwest 10 to 15 knots becoming south in the
afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
cloudy with showers after midnight.
Sfc winds...........Southeast 20 to 25 knots.
100-ft winds........Southeast to 30 knots.
Sig waves...........3 to 5 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 9 feet after
midnight.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 8 to 12 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 6 to 9 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 6 to 9 feet.
$$
LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 PM EDT Thu Apr 9 2026
.Overnight...
Weather.............Mostly cloudy.
Sfc winds...........West 5 to 10 knots late in the evening becoming
light and variable.
100-ft winds........West 10 to 15 knots late in the evening
becoming light and variable.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY...
Weather.............Partly sunny.
Sfc winds...........West 5 to 10 knots becoming northwest 10 to 15
knots in the afternoon.
100-ft winds........West 10 to 15 knots becoming northwest 15 to 20
knots in the afternoon.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Southwest 10 to 15 knots becoming south 5 to 10
knots in the afternoon.
100-ft winds........Southwest 15 to 20 knots becoming south 10 to
15 knots in the afternoon.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 4 to 6 feet after
midnight.
Ocnl waves..........Around 7 feet after midnight.
Wave heights are for ice free areas.
.FORECAST DAYS 3 THROUGH 5...
.SUNDAY...Breezy. Showers with a chance of thunderstorms. showers
likely and slight chance of thunderstorms. Southeast winds 20 to
25 knots. Waves 10 to 14 feet.
.MONDAY...Chance of showers. Southwest winds 10 to 15 knots.
Waves 8 to 12 feet.
.TUESDAY...Breezy. Chance of showers. chance of snow showers.
North winds 20 to 25 knots. Waves 8 to 12 feet.
$$
LSZ261-100800-
MAFOR 1003/
Superior West 13700 11600 11610 12510 11500. Waves 2 feet or
less.
Superior North Central 12700 13600 12610 11620. Waves 1 to 3
feet.
Superior South Central 11700 12600 12610 11710 11610 11600. Waves
2 feet or less.
Superior East 12700 12600 11700 12710 11610. Waves 3 to 5 feet
subsiding to 2 to 3 feet overnight. Waves 1 to 2 feet Friday and
Friday evening.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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