Showers and thunderstorms are expected to linger cross the South through the next couple of days as a trailing front stalls across the region. Isolated to scattered severe thunderstorms may produce large hail, severe wind gusts, and heavy rain across portions of the southern Plains today and Wednesday. Read More >
FZUS63 KMQT 221415
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 AM EDT Tue Apr 22 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 ridging of around 30.1 inches remains over Lake
Superior today into Wednesday. After weak troughing of around 30.0
inches moves over the lake late Wednesday, expect ridging to build
back up to 30.3 inches by Thursday and to continue through Friday
as high pressure moves through northern Ontario. High pressure
averaging 30.4 inches then shifts over the Upper Great Lakes
Saturday before moving into the Lower Great Lakes on Sunday.
LSZ162-222145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 AM EDT Tue Apr 22 2025 /844 AM CDT Tue Apr 22 2025/
.REST OF TODAY, East winds 10 to 20 knots. A slight chance of
rain showers. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT, East winds 10 to 20 knots backing northeast after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of rain showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY, East winds 5 to 15 knots veering southwest in the
afternoon, then becoming west 10 to 20 knots late. A slight
chance of rain showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT, North winds 5 to 15 knots. A slight chance of
rain showers through midnight. Waves calm to 2 feet.
.THURSDAY, Northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT, Northeast winds 10 to 20 knots. A chance of
rain showers. Waves building to 1 to 3 feet.
.FRIDAY, Northeast winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY, Northeast winds 10 to 20 knots veering east. Waves
calm to 2 feet.
LSZ162-222000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 AM EDT Tue Apr 22 2025 /915 AM CDT Tue Apr 22 2025/
.This Afternoon...
Weather.............Mostly cloudy, then slight chance of showers in
the afternoon.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet in the
afternoon.
Ocnl waves..........Around 5 feet in the afternoon.
.TONIGHT...
Weather.............Mostly cloudy with a slight chance of showers.
Sfc winds...........Northeast 15 to 20 knots.
100-ft winds........Northeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.WEDNESDAY...
Weather.............Partly sunny.
Sfc winds...........Northeast 5 to 10 knots becoming south in the
afternoon.
100-ft winds........Northeast 10 to 15 knots becoming south in the
afternoon.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Southwest 5 to 10 knots becoming northwest
after midnight.
100-ft winds........Southwest 10 to 15 knots becoming northwest
after midnight.
Sig waves...........1 to 3 feet.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ263-222000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 AM EDT Tue Apr 22 2025
.This Afternoon...
Weather.............Partly sunny.
Sfc winds...........North 5 to 10 knots becoming east 10 to 15
knots in the afternoon.
100-ft winds........North 10 to 15 knots becoming east 15 to 20
knots in the afternoon.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly cloudy with a slight chance of showers.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.WEDNESDAY...
Weather.............Partly sunny, then chance of showers in the
afternoon.
Sfc winds...........Northeast 5 to 10 knots becoming southeast 10
to 15 knots in the afternoon.
100-ft winds........Northeast 10 to 15 knots becoming southeast 15
to 20 knots in the afternoon.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ264-222000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 AM EDT Tue Apr 22 2025
.This Afternoon...
Weather.............Partly sunny.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........2 to 4 feet.
.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...........2 to 4 feet.
.WEDNESDAY...
Weather.............Partly sunny with chance of showers.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........South 10 to 15 knots becoming north after
midnight.
100-ft winds........South 15 to 20 knots becoming north after
midnight.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ265-222000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 AM EDT Tue Apr 22 2025
.This Afternoon...
Weather.............Mostly sunny.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly cloudy with a slight chance of showers.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY...
Weather.............Partly sunny with chance of showers.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........North 5 to 10 knots becoming south 10 to 15
knots after midnight.
100-ft winds........North 10 to 15 knots becoming south 15 to 20
knots after midnight.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ266-222000-
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 Tue Apr 22 2025
.This Afternoon...
Weather.............Mostly sunny.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.TONIGHT...
Weather.............Mostly cloudy, then slight chance of showers
after midnight.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY...
Weather.............Partly sunny, then chance of showers in the
afternoon.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........East 10 to 15 knots becoming south after
midnight.
100-ft winds........East 15 to 20 knots becoming south after
midnight.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet in the evening.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ267-222000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 AM EDT Tue Apr 22 2025
.This Afternoon...
Weather.............Mostly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.TONIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 5 to 10 knots becoming east 10 to 15
knots after midnight.
100-ft winds........Northwest 10 to 15 knots becoming east 15 to 20
knots after midnight.
Sig waves...........2 to 4 feet.
.WEDNESDAY...
Weather.............Mostly sunny, then chance of showers in the
afternoon.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.WEDNESDAY NIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...Chance of showers after midnight. Northeast winds
5 to 10 knots. Waves 2 to 4 feet.
.FRIDAY...Chance of showers in the morning. Northeast winds 10 to
15 knots. Waves 4 to 6 feet.
.SATURDAY...North winds 10 to 15 knots. Waves 4 to 6 feet.
$$
LSZ261-222000-
MAFOR 2215/
Superior West 12210 12220 12210 11200 11300. A chance of rain
showers this evening. Waves 1 to 3 feet.
Superior North Central 11100 11200 12210 12310 12320. A chance of
rain showers Wednesday morning. Waves 2 feet or less this
afternoon. Waves 1 to 3 feet tonight and Wednesday morning.
Superior South Central 11800 11200 12210 14310. Waves 1 to 3
feet.
Superior East 11710 11700 11800 11200 11210 13310. Waves 2 to 4
feet this afternoon. Waves 1 to 3 feet tonight and Wednesday
morning.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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