Severe thunderstorms are forecast through this weekend along a slow moving cold front and secondary storm system that will impact areas from the southern Plains to the Great Lakes. Large hail and isolated damaging wind gusts are the main threats with these storms along with a risk for heavy to excessive rainfall which could bring flooding. Read More >
FZUS63 KMQT 182015
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
415 PM EDT Fri Apr 18 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...Low pressure of 29.6 inches moves through Lower
Michigan through this evening, heading to souteastern Ontario by
Saturday morning. High pressure of 30.2 inches over the northern
Plains Saturday morning will strengthen to 30.5 inches over the
Upper Great Lakes Sunday morning. This high pressure will give
way to another low pressure lifting into the Upper Great Lakes at
around 29.6 inches by Monday morning. Behind the low, weak ridging
of around 30.0 inches moves back over Lake Superior on Tuesday
into Wednesday.
LSZ162-190345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
339 PM EDT Fri Apr 18 2025 /239 PM CDT Fri Apr 18 2025/
.LATE THIS AFTERNOON, Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT, Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY, Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet.
.SATURDAY NIGHT, Southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight, then becoming southeast 5 to
15 knots late. Waves calm to 2 feet.
.SUNDAY, Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT, East winds 10 to 20 knots backing northeast after
midnight. A chance of rain. Waves building to 1 to 3 feet.
.MONDAY, Northeast winds 15 to 25 knots backing north by mid
afternoon. Rain likely through early afternoon, then a chance of
rain by mid afternoon. Waves building to 3 to 5 feet occasionally
to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT, Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.TUESDAY, East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.
.WEDNESDAY, Southwest winds 10 to 20 knots veering west. Waves
subsiding to calm to 2 feet.
LSZ162-190200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EDT Fri Apr 18 2025 /315 PM CDT Fri Apr 18 2025/
.Tonight...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
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...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........East 5 to 10 knots.
100-ft winds........East 10 to 15 knots.
Sig waves...........1 to 3 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ263-190200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
415 PM EDT Fri Apr 18 2025
.Tonight...
Weather.............Mostly cloudy with isolated showers and patchy
fog, then mostly cloudy after midnight.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 5 to 10 knots becoming southeast
after midnight.
100-ft winds........Southwest 10 to 15 knots becoming southeast
after midnight.
Sig waves...........1 to 3 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ264-190200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EDT Fri Apr 18 2025
.Tonight...
Weather.............Mostly cloudy with patchy fog, then mostly
cloudy after midnight.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 6 feet after
midnight.
.SATURDAY...
Weather.............Mostly sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Southwest 5 to 10 knots.
100-ft winds........Southwest 10 to 15 knots.
Sig waves...........2 to 4 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ265-190200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EDT Fri Apr 18 2025
.Tonight...
Weather.............Mostly cloudy with patchy fog and isolated
showers, then mostly cloudy with patchy fog
after midnight.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 6 feet after
midnight.
.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........North 5 to 10 knots in the evening becoming
light and variable.
100-ft winds........North 10 to 15 knots in the evening becoming
light and variable.
Sig waves...........2 to 4 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........South 5 to 10 knots becoming east 10 to 15
knots in the afternoon.
100-ft winds........South 10 to 15 knots becoming east 15 to 20
knots in the afternoon.
Sig waves...........1 to 3 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ266-190200-
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 Apr 18 2025
.Tonight...
Weather.............Mostly cloudy with a slight chance of
thunderstorms and showers with possible fog,
then mostly cloudy with patchy fog after
midnight.
Sfc winds...........Northwest 15 to 20 knots becoming north after
midnight.
100-ft winds........Northwest 20 to 25 knots becoming north after
midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SATURDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........West 10 to 15 knots.
100-ft winds........West 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
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 5 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ267-190200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EDT Fri Apr 18 2025
.Tonight...
Weather.............Cloudy with scattered showers with possible
thunderstorms and fog, then mostly cloudy with
a slight chance of thunderstorms and showers
with possible fog and after midnight.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SATURDAY...
Weather.............Partly sunny.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.SATURDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northwest 15 to 20 knots.
100-ft winds........Northwest 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.SUNDAY...
Weather.............Mostly sunny.
Sfc winds...........North 5 to 10 knots becoming southeast in the
afternoon.
100-ft winds........North 10 to 15 knots becoming southeast in the
afternoon.
Sig waves...........2 to 4 feet.
.SUNDAY NIGHT...
Weather.............Cloudy, then chance of rain after midnight.
Sfc winds...........East 15 to 20 knots.
100-ft winds........East 20 to 25 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet after midnight.
.FORECAST DAYS 3 THROUGH 5...
.MONDAY...Rain. chance of showers after midnight. East winds
15 to 20 knots. Waves 6 to 9 feet.
.TUESDAY...Chance of showers. North winds 10 to 15 knots. Waves
4 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots. Waves 3 to 5 feet.
$$
LSZ261-190200-
MAFOR 1821/
Superior West 15710 12610. Waves 1 to 2 feet.
Superior North Central 11720 14820 11820 12720. Waves 2 to 3 feet
tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet Saturday.
Superior South Central 12710 15720. Waves 1 to 3 feet building to
2 to 4 feet tonight. Waves 2 to 4 feet Saturday.
Superior East 11710 11720 11720 19726 14720 11720. Waves 2 to 4
feet building to 3 to 5 feet tonight. Waves 3 to 5 feet Saturday.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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