fzus63 kdtx 100900
glflh 
expires:202512101700;;324154

open lake forecast for lake huron
national weather service detroit/pontiac mi
400 am est wed dec 10 2025

for waters beyond five nautical miles off shore on lake huron

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, 29.30 inches, tracks through through
southern lower michigan today. the system brings mostly snow to
lake huron with some rain farther south. a period of gales is
likely behind the low passage this afternoon and tonight over
much of southern lake huron.


lhz361-362-101700-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
400 am est wed dec 10 2025

.today...northwest winds 10 to 15 knots becoming north 15 to
20 knots late in the morning...then increasing to 20 to 25 knots
with gusts to around 30 knots in the afternoon. a chance of snow
in the morning. waves 2 to 4 feet building to 8 to 12 feet. waves
occasionally around 15 feet. 
.tonight...northwest winds 20 to 25 knots. gusts to 30 knots
until early morning. waves 8 to 12 feet. waves occasionally
around 15 feet. 
.thursday...northwest winds 20 to 25 knots decreasing to 15 to
20 knots in the late morning and afternoon. waves 6 to 9 feet.
waves occasionally around 12 feet. 
.thursday night...northwest winds 15 to 20 knots decreasing to
10 to 15 knots in the late evening and overnight. waves 4 to
6 feet. 
.friday...west winds 10 to 15 knots becoming southwest 15 to
20 knots late in the evening. snow likely late in the afternoon.
waves 2 to 4 feet subsiding to 1 to 3 feet late in the morning...
then building to 3 to 5 feet late in the afternoon building to
6 to 9 feet late in the evening. waves occasionally around
12 feet. 
.saturday...west winds 20 to 25 knots. a chance of snow. waves
6 to 9 feet. waves occasionally around 12 feet. 
.sunday...northwest winds 20 to 25 knots decreasing to 10 to
15 knots. a chance of snow early in the morning. waves 6 to
9 feet. waves occasionally around 12 feet. 


$$

fzus63 kdtx 100900
glflh 
expires:202512101700;;324155

open lake forecast for lake huron
national weather service detroit/pontiac mi
400 am est wed dec 10 2025

for waters beyond five nautical miles off shore on lake huron

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, 29.30 inches, tracks through through
southern lower michigan today. the system brings mostly snow to
lake huron with some rain farther south. a period of gales is
likely behind the low passage this afternoon and tonight over
much of southern lake huron.


lhz363-462>464-101700-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
lake huron from port austin to harbor beach beyond 5nm off shore-
lake huron from harbor beach to port sanilac beyond 5nm off shore-
lake huron from port sanilac to port huron beyond 5nm off shore-
400 am est wed dec 10 2025

...gale warning in effect from 11 am est this morning through
late tonight...

.today...east winds 15 to 20 knots becoming north 20 to 25 knots
with gusts to 35 knot gales in the late morning and early
afternoon...then increasing to 30 knots with gusts to 35 knot
gales late in the afternoon. snow and rain in the morning...then
a chance of snow in the afternoon. waves 2 to 4 feet building to
10 to 14 feet. waves occasionally around 18 feet. 
.tonight...northwest winds to 30 knots with gusts to 35 knot
gales. a chance of snow and freezing rain in the evening...then a
chance of snow after midnight. waves 10 to 14 feet. waves
occasionally around 18 feet. 
.thursday...northwest winds to 30 knots decreasing to 20 to
25 knots with gusts to around 30 knots in the late morning and
afternoon. a chance of snow. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.thursday night...west winds 20 to 25 knots decreasing to 10 to
15 knots. waves 5 to 7 feet. waves occasionally around 10 feet. 
.friday...west winds 10 to 15 knots becoming southwest 15 to
20 knots late in the evening. a chance of snow late in the
afternoon. waves 2 to 4 feet building to 6 to 9 feet late in the
evening. waves occasionally around 12 feet. 
.saturday...west winds 20 to 25 knots. gusts to 30 knots. a
chance of snow. waves 8 to 12 feet. waves occasionally around
15 feet. 
.sunday...west winds to 30 knots becoming northwest 15 to
20 knots. a chance of snow until afternoon. waves 6 to 9 feet.
waves occasionally around 12 feet. 


$$

fzus63 kmkx 100921
glflm 
expires:202512101645;;326448

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
321 am cst wed dec 10 2025

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

northerly gales will continues to develop this morning across the
southern two-thirds of lake michigan behind departing low
pressure. the brisk winds will then gradually diminish tonight, as
high pressure of 30.1 inches approaches from the west. a period 
of northwesterly gales may then return friday night into saturday 
as a strong arctic front moves through the great lakes region. 
heavy freezing spray may also develop late week into the weekend
as the colder airmass moves in.


lmz669-671-870-872-101645-
lake michigan from sheboygan to port washington wi 5 nm offshore
to mid lake-
lake michigan from port washington to north point light wi 5 nm
offshore to mid lake-
lake michigan from whitehall to pentwater mi 5 nm offshore to mid
lake-
lake michigan from grand haven to whitehall mi 5 nm offshore to
mid lake-
321 am cst wed dec 10 2025

sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...

...gale warning in effect through this afternoon...

.today...north gales to 40 kt becoming northwest gales to 35 kt.
snow and slight chance of rain this morning, then chance of snow
this afternoon. waves 10 to 14 ft occasionally to 18 ft. 
.tonight...northwest winds to 30 kt diminishing to 15 to 25 kt.
waves 8 to 12 ft occasionally to 16 ft subsiding to 6 to 9 ft
occasionally to 12 ft. 
.thursday...northwest winds 15 to 25 kt becoming west 10 to
20 kt. waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to
5 ft. 
.thursday night...west winds 5 to 10 kt becoming southwest.
chance of snow overnight. waves 2 to 4 ft subsiding to 1 to 2 ft.
.friday...west winds 10 to 15 kt increasing to 15 to 25 kt in the
afternoon. chance of snow. waves 1 to 3 ft building to 4 to 6 ft
occasionally to 8 ft. 
.friday night...west winds to 30 kt. freezing spray. chance of
snow. waves 7 to 10 ft occasionally to 13 ft building to 8 to
11 ft occasionally to 14 ft. 
.saturday...northwest winds to 30 kt. freezing spray. chance of
snow. waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to
10 ft occasionally to 13 ft. 
.sunday...northwest winds to 30 kt. freezing spray. waves 8 to
11 ft occasionally to 14 ft subsiding to 6 to 9 ft occasionally
to 12 ft.  

$$

fzus63 kmkx 100921
glflm 
expires:202512101645;;326446

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
321 am cst wed dec 10 2025

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

northerly gales will continues to develop this morning across the
southern two-thirds of lake michigan behind departing low
pressure. the brisk winds will then gradually diminish tonight, as
high pressure of 30.1 inches approaches from the west. a period 
of northwesterly gales may then return friday night into saturday 
as a strong arctic front moves through the great lakes region. 
heavy freezing spray may also develop late week into the weekend
as the colder airmass moves in.


lmz261-362-364-563-101645-
lake michigan from seul choix point to rock island passage 5 nm
offshore to mid lake-
lake michigan south of a line from seul choix point to the
mackinac bridge and north of a line from charlevoix mi to south
fox island 5 nm offshore-
lake michigan from charlevoix to point betsie mi 5 nm offshore to
mid lake-
lake michigan from rock island passage to sturgeon bay wi-
321 am cst wed dec 10 2025

sturgeon bay wi to point betsie mi north...

.today...north winds to 30 kt becoming northwest. slight chance
of snow this morning, then chance of snow this afternoon. waves
6 to 9 ft occasionally to 12 ft. 
.tonight...northwest winds to 30 kt diminishing to 15 to 25 kt.
chance of snow in the evening, then slight chance of snow
overnight. waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 7 ft occasionally to 9 ft. 
.thursday...northwest winds to 30 kt diminishing to 10 to 20 kt.
waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. 
.thursday night...northwest winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 3 ft subsiding to 1 ft or less. 
.friday...west winds 10 to 15 kt increasing to 10 to 20 kt.
chance of snow in the afternoon. waves 1 to 2 ft building to 2 to
4 ft. 
.friday night...west winds to 30 kt becoming northwest gales to
35 kt. chance of snow. waves 4 to 7 ft occasionally to 9 ft
building to 5 to 8 ft occasionally to 10 ft. 
.saturday...northwest gales to 35 kt diminishing to 30 kt.
freezing spray. chance of snow. waves 5 to 8 ft occasionally to
10 ft subsiding to 4 to 6 ft occasionally to 8 ft. 
.sunday...northwest winds to 30 kt. waves 4 to 7 ft occasionally
to 9 ft subsiding to 3 to 5 ft.  

$$

fzus63 kmkx 100921
glflm 
expires:202512101645;;326447

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
321 am cst wed dec 10 2025

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

northerly gales will continues to develop this morning across the
southern two-thirds of lake michigan behind departing low
pressure. the brisk winds will then gradually diminish tonight, as
high pressure of 30.1 inches approaches from the west. a period 
of northwesterly gales may then return friday night into saturday 
as a strong arctic front moves through the great lakes region. 
heavy freezing spray may also develop late week into the weekend
as the colder airmass moves in.


lmz366-565-567-868-101645-
lake michigan from point betsie to manistee mi 5 nm offshore to
mid lake-
lake michigan from sturgeon bay to two rivers wi 5 nm offshore to
mid lake-
lake michigan from two rivers to sheboygan wi 5 nm offshore to
mid lake-
lake michigan from pentwater to manistee mi 5 nm offshore to mid
lake-
321 am cst wed dec 10 2025

sturgeon bay wi to point betsie mi south to sheboygan wi to
pentwater mi...

...gale warning in effect through this afternoon...

.today...north gales to 40 kt diminishing to gales to 35 kt late
this morning, then becoming north gales to 35 kt early this
afternoon becoming northwest to 30 kt late. chance of snow. waves
8 to 12 ft occasionally to 16 ft. 
.tonight...northwest winds to 30 kt diminishing to 15 to 25 kt.
waves 7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft
occasionally to 10 ft. 
.thursday...northwest winds 10 to 20 kt becoming west. waves 4 to
7 ft occasionally to 9 ft subsiding to 2 to 4 ft. 
.thursday night...west winds 5 to 10 kt. waves 1 to 3 ft
subsiding to 1 to 2 ft. 
.friday...west winds 10 to 15 kt increasing to 15 to 25 kt in the
afternoon. chance of snow in the afternoon. waves 1 to 2 ft
building to 3 to 5 ft. 
.friday night...west winds to 30 kt. freezing spray. chance of
snow. waves 7 to 10 ft occasionally to 13 ft. 
.saturday...northwest winds to 30 kt. freezing spray. chance of
snow. waves 7 to 10 ft occasionally to 13 ft. 
.sunday...northwest winds to 30 kt diminishing to 15 to 25 kt.
freezing spray. waves 6 to 9 ft occasionally to 12 ft.  

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324244

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz265-102100-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am est wed dec 10 2025

...gale warning in effect until 11 am est this morning...

.early this morning...north gales to 35 knots. a slight chance of
snow showers. waves 4 to 8 feet occasionally to 10 feet. 
.today...north gales to 40 knots becoming northwest gales to
35 knots by mid afternoon. a slight chance of snow showers.
freezing spray in the afternoon. waves building to 6 to 10 feet
occasionally to 13 feet. 
.tonight...northwest gales to 35 knots diminishing to 20 to
30 knots by midnight. a slight chance of snow showers. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.thursday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. a slight chance of snow showers in the morning. waves
subsiding to 1 to 3 feet. 
.thursday night...northwest winds 10 to 20 knots backing west
after midnight. a slight chance of snow showers. waves subsiding
to calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. waves building to 2 to
4 feet. 
.friday night...west gales to 35 knots becoming northwest gales
to 40 knots after midnight. freezing spray. snow showers likely.
waves building to 8 to 11 feet occasionally to 14 feet. 
.saturday...northwest gales to 40 knots. freezing spray. snow
showers likely. waves subsiding to 6 to 9 feet occasionally to
11 feet. 
.sunday...northwest winds 20 to 30 knots becoming southwest 15 to
25 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324245

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz266-102100-
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-
401 am est wed dec 10 2025

...gale warning in effect through this evening...

.early this morning...north gales to 35 knots. freezing spray. a
slight chance of snow showers. waves 4 to 8 feet occasionally to
10 feet. 
.today...north gales to 40 knots backing northwest by mid
afternoon. freezing spray. a chance of snow showers. waves
building to 8 to 11 feet occasionally to 14 feet. 
.tonight...northwest gales to 40 knots becoming north gales to
35 knots by midnight, then diminishing to 20 to 30 knots late.
freezing spray in the evening. a chance of snow showers. waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet. 
.thursday...north winds 20 to 30 knots becoming northwest 15 to
25 knots. a chance of snow showers. waves subsiding to 2 to
4 feet. 
.thursday night...northwest winds 10 to 20 knots. a chance of
snow showers. waves subsiding to calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. waves building to 3 to
5 feet occasionally to 7 feet. 
.friday night...west gales to 35 knots becoming northwest gales
to 40 knots after midnight. freezing spray. snow showers. waves
building to 10 to 14 feet occasionally to 18 feet. 
.saturday...northwest gales to 35 knots. freezing spray. snow
showers. waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 9 to 12 feet occasionally to 15 feet. 
.sunday...northwest winds 20 to 30 knots becoming southwest 15 to
25 knots. freezing spray. a chance of snow showers. waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324246

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz267-102100-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am est wed dec 10 2025

.early this morning...northeast winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.today...north winds 20 to 30 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible by late morning, then
becoming northwest to 30 knots with a few gale force gusts to
40 knots possible by mid afternoon. freezing spray. a chance of
snow showers. waves building to 7 to 10 feet occasionally to
13 feet. 
.tonight...north winds to 30 knots with a few gale force gusts to
40 knots possible diminishing to 20 to 30 knots late. freezing
spray in the evening. a chance of snow showers. waves building to
9 to 12 feet occasionally to 15 feet, then subsiding to 5 to
8 feet occasionally to 10 feet. 
.thursday...north winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then backing northwest by mid
afternoon. a chance of snow showers. waves subsiding to 2 to
4 feet. 
.thursday night...north winds 10 to 20 knots backing northwest
after midnight. a slight chance of snow showers. waves subsiding
to calm to 2 feet. 
.friday...west winds 10 to 20 knots backing southwest in the
afternoon. a chance of snow showers in the morning, then snow
showers likely in the afternoon. waves building to 1 to 3 feet. 
.friday night...west winds 20 to 30 knots becoming northwest
gales to 35 knots after midnight. snow showers. freezing spray
after midnight. waves building to 10 to 14 feet occasionally to
18 feet. 
.saturday...northwest gales to 35 knots becoming north 20 to
30 knots. freezing spray. snow showers. waves subsiding to 7 to
10 feet occasionally to 13 feet. 
.sunday...north winds 15 to 25 knots backing southwest. freezing
spray. a chance of snow showers. waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324241

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz162-102100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am est wed dec 10 2025 /301 am cst wed dec 10 2025/

.early this morning...north winds 20 to 30 knots. freezing spray.
waves 5 to 8 feet occasionally to 10 feet. 
.today...north winds 20 to 30 knots diminishing to 15 to 25 knots
by late morning, then backing northwest by mid afternoon.
freezing spray in the morning. waves subsiding to 2 to 4 feet. 
.tonight...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. waves subsiding to calm to 2 feet. 
.thursday...northwest winds 5 to 15 knots backing west. waves
calm to 2 feet. 
.thursday night...west winds 5 to 15 knots. a slight chance of
snow showers after midnight. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. snow showers likely in the morning, then a
chance of snow showers in the afternoon. waves building to 3 to
5 feet occasionally to 7 feet. 
.friday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots. waves subsiding to
1 to 3 feet. 
.sunday...northwest winds 15 to 25 knots backing southwest. a
chance of snow showers. waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324242

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz263-102100-
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-
401 am est wed dec 10 2025

...gale warning in effect until 11 am est this morning...

.early this morning...north gales to 35 knots. freezing spray. a
slight chance of snow showers. waves 5 to 9 feet occasionally to
11 feet. 
.today...north gales to 35 knots diminishing to 20 to 30 knots by
late morning, then becoming northwest 15 to 25 knots by mid
afternoon. a slight chance of snow showers in the morning.
freezing spray. waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tonight...northwest winds 15 to 25 knots becoming north 10 to
20 knots late. waves subsiding to 2 to 4 feet. 
.thursday...northwest winds 5 to 15 knots backing west by mid
afternoon. waves subsiding to calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots backing west
after midnight. a slight chance of snow showers after midnight.
waves calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. waves building to 4 to
7 feet occasionally to 9 feet. 
.friday night...northwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. heavy freezing spray. a chance
of snow showers. waves building to 6 to 9 feet occasionally to
11 feet. 
.saturday...northwest winds 20 to 30 knots. heavy freezing spray.
waves subsiding to 4 to 7 feet occasionally to 9 feet. 
.sunday...northwest winds 15 to 25 knots becoming southwest 20 to
30 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 100901
glfls 
expires:202512102100;;324243

open lake forecast for lake superior
national weather service marquette mi
401 am est wed dec 10 2025

for waters beyond 5 nautical miles of shore on lake superior.

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...

29.2 inch low pressure analyzed over southern lake michigan this 
morning slides over the southern lp today, keeping a 29.5 inch 
trough over lake superior at least through the mid-morning. this 
weakens slightly to 29.6 or 29.7 inches this afternoon as the low 
continues to track through southern ontario and eventually quebec 
tonight. this will allow 30.3 inch high pressure to rebuild over the 
northern plains later today through thursday while extending weak 
ridging over lake superior. ridging breaks down slightly early 
friday as a 29.9 inch trough drops out of northern ontario, but 
riding quickly rebuilds this weekend as 30.5 inch high pressure over 
the northern plains extends back into the great lakes.



lsz264-102100-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am est wed dec 10 2025

...gale warning in effect until 11 am est this morning...

.early this morning...north gales to 35 knots. freezing spray. a
slight chance of snow showers. waves 5 to 9 feet occasionally to
11 feet. 
.today...north gales to 35 knots diminishing to 20 to 30 knots by
late morning, then backing northwest by mid afternoon. freezing
spray. waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet. 
.tonight...northwest winds 20 to 30 knots becoming north 15 to
25 knots by midnight. freezing spray. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.thursday...north winds 15 to 25 knots becoming northwest 10 to
20 knots by late morning, then diminishing to 5 to 15 knots by
mid afternoon. waves subsiding to calm to 2 feet. 
.thursday night...northwest winds 5 to 15 knots. a slight chance
of snow showers after midnight. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon. a chance of snow showers in the morning, then
snow showers likely in the afternoon. waves building to 3 to
6 feet occasionally to 8 feet. 
.friday night...northwest gales to 35 knots. heavy freezing
spray. snow showers likely in the evening. a chance of snow
showers after midnight. waves building to 8 to 11 feet
occasionally to 14 feet. 
.saturday...northwest gales to 35 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 6 to 9 feet
occasionally to 11 feet. 
.sunday...northwest winds 20 to 30 knots becoming southwest 15 to
25 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

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