A low pressure center tracking across the Great Lakes and its associated cold front extending across the Southern Plains will focus occasional showers and thunderstorms through tonight. A few of these thunderstorms may become severe alongside heavy rainfall that may cause flash flooding; Portions of the Southern Plains would be the greatest threat for these hazards through tonight. Read More >
FZUS63 KMQT 011415
GLFLS
Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
1015 AM EDT Thu May 1 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...29.6 inch low pressure over southern Lake Michigan will
head northeast and deepen to 29.5 inches near Houghton Lake,
Michigan by this evening. The low will track into southwestern Quebec
Friday morning while 30.0 inch ridging gradually builds back over
Lake Superior. This ridge builds to 30.2 inches as it slowly shifts
across the Great Lakes Basin this weekend. On Monday, the ridge
weakens to 30.1 inches over Lake Superior as troughing at 29.7
inches moves into the Dakotas.
LSZ162-012000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1008 AM EDT Thu May 1 2025 /908 AM CDT Thu May 1 2025/
.REST OF TODAY, Northeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. A slight chance of rain showers
by mid afternoon. Waves calm to 2 feet building to 2 to 4 feet.
.TONIGHT, Northeast winds 10 to 20 knots backing north late. A
chance of rain showers through midnight, then rain showers,
possibly mixed with snow after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY, North winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then veering south late. Snow showers
likely, possibly mixed with rain showers through early afternoon.
Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT, Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY, Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT, Southwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.SUNDAY, Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.MONDAY, East winds 5 to 15 knots becoming west 10 to 20 knots.
Waves calm to 2 feet.
LSZ162-012000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1015 AM EDT Thu May 1 2025 /915 AM CDT Thu May 1 2025/
.This Afternoon...
Weather.............Partly sunny.
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 in the afternoon.
.TONIGHT...
Weather.............Mostly cloudy with chance of showers, then
showers likely and slight chance of snow
showers after midnight.
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.
.FRIDAY...
Weather.............Cloudy with rain and snow showers likely, then
mostly cloudy with chance of showers in the
afternoon.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Light and variable winds.
100-ft winds........Light and variable winds.
Sig waves...........2 to 4 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ263-012000-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
1015 AM EDT Thu May 1 2025
.This Afternoon...
Weather.............Mostly cloudy.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of showers, then
cloudy with snow showers likely with a chance
of showers after midnight.
Sfc winds...........Northeast 20 to 25 knots.
100-ft winds........Northeast to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FRIDAY...
Weather.............Cloudy with rain and snow showers likely, then
mostly cloudy with chance of snow showers in
the afternoon.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........North 5 to 10 knots becoming southwest after
midnight.
100-ft winds........North 10 to 15 knots becoming southwest after
midnight.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 5 feet in the evening.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ264-012000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1015 AM EDT Thu May 1 2025
.This Afternoon...
Weather.............Mostly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.TONIGHT...
Weather.............Mostly cloudy with a slight chance of showers,
then cloudy with chance of showers and slight
chance of snow showers after midnight.
Sfc winds...........Northeast 10 to 15 knots increasing to 20 to 25
knots after midnight.
100-ft winds........Northeast 15 to 20 knots increasing to 30 knots
after midnight.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 8 feet.
.FRIDAY...
Weather.............Cloudy with rain and snow showers likely, then
mostly cloudy in the afternoon.
Sfc winds...........North 20 to 25 knots.
100-ft winds........North to 30 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 9 feet.
.FRIDAY NIGHT...
Weather.............Partly cloudy.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 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...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ265-012000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1015 AM EDT Thu May 1 2025
.This Afternoon...
Weather.............Mostly cloudy.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
.TONIGHT...
Weather.............Mostly cloudy with a slight chance of showers,
then mostly cloudy with chance of showers after
midnight.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet after midnight.
.FRIDAY...
Weather.............Snow showers with showers likely, then rain and
snow showers likely in the afternoon.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........4 to 6 feet.
Ocnl waves..........Around 7 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy.
Sfc winds...........Northwest 5 to 10 knots.
100-ft winds........Northwest 10 to 15 knots.
Sig waves...........4 to 6 feet subsiding to 2 to 4 feet after
midnight.
Ocnl waves..........Around 7 feet subsiding to around 5 feet after
midnight.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ266-012000-
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 Thu May 1 2025
.This Afternoon...
Weather.............Mostly cloudy, then slight chance of showers in
the afternoon.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of showers, then
mostly cloudy with a slight chance of showers
after midnight.
Sfc winds...........East 10 to 15 knots becoming northeast after
midnight.
100-ft winds........East 15 to 20 knots becoming northeast after
midnight.
Sig waves...........3 to 5 feet building to 5 to 7 feet after
midnight.
Ocnl waves..........Around 5 feet building to around 8 feet after
midnight.
.FRIDAY...
Weather.............Rain and snow showers likely, then showers
likely with a chance of snow showers in the
afternoon.
Sfc winds...........North 15 to 20 knots.
100-ft winds........North 20 to 25 knots.
Sig waves...........5 to 7 feet.
Ocnl waves..........Around 8 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
partly cloudy after midnight.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 6 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ267-012000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1015 AM EDT Thu May 1 2025
.This Afternoon...
Weather.............Mostly cloudy, then chance of showers in the
afternoon.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........3 to 5 feet.
Ocnl waves..........Around 5 feet.
.TONIGHT...
Weather.............Mostly cloudy with chance of showers.
Sfc winds...........East 10 to 15 knots.
100-ft winds........East 15 to 20 knots becoming north after
midnight.
Sig waves...........2 to 4 feet.
.FRIDAY...
Weather.............Mostly cloudy with chance of showers, then
cloudy with showers likely in the afternoon.
Sfc winds...........North 10 to 15 knots.
100-ft winds........North 15 to 20 knots.
Sig waves...........2 to 4 feet.
.FRIDAY NIGHT...
Weather.............Mostly cloudy with chance of showers, then
partly cloudy after midnight.
Sfc winds...........Northwest 10 to 15 knots.
100-ft winds........Northwest 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.SUNDAY...North winds 5 to 10 knots. Waves 2 to 4 feet.
.MONDAY...Northeast winds 10 to 15 knots. Waves 2 to 4 feet.
$$
LSZ261-012000-
MAFOR 0115/
Superior West 11200 11110 11120 12130 11136 11137 11127. Waves 1
to 3 feet this afternoon. Waves 3 to 6 feet tonight and Friday
morning.
Superior North Central 11310 12210 11220 12120 11127 11137. Waves
1 to 3 feet this afternoon. Waves 2 to 4 feet building to 3 to 6
feet tonight. Waves 4 to 6 feet Friday morning.
Superior South Central 11310 11210 11310 12210 11810 11816 11817.
Waves 1 to 2 feet this afternoon and tonight. Waves 2 to 4 feet
Friday morning.
Superior East 12320 11310 11210 11110 12810 11110. A chance of
rain showers tonight and Friday morning. Waves 1 to 3 feet.
$$
Occasional waves will only be displayed when values meet or exceed 5 feet.
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