fzus63 kdtx 111455
glflh 
expires:202512112300;;394251

open lake forecast for lake huron
national weather service detroit/pontiac mi
955 am est thu dec 11 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...high pressure, 30.10 inches, builds from the midwest
today into the great lakes tonight and friday. this is followed
by low pressure, 29.70 inches, moving in from central canada into
northern ontario friday night and saturday. sporadic gale force
wind gusts are possible with this system.


lhz361-362-112300-
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-
955 am est thu dec 11 2025

.rest of today...northwest winds 15 to 20 knots. scattered snow
showers. waves 6 to 9 feet. waves occasionally around 12 feet. 
.tonight...northwest winds 15 to 20 knots decreasing to 10 to
15 knots in the late evening and overnight. waves 4 to 6 feet.
waves occasionally around 8 feet. 
.friday...west winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...southwest winds 10 to 15 knots increasing to
15 to 20 knots in the late evening and overnight. snow in the
evening...then snow likely after midnight. waves 2 to 4 feet
building to 5 to 7 feet in the late evening and overnight. waves
occasionally around 10 feet. 
.saturday...west winds 20 to 25 knots. gusts to 30 knots late in
the morning. a chance of snow. freezing spray. waves 8 to
12 feet. waves occasionally around 15 feet. 
.sunday...northwest winds 20 to 25 knots decreasing to 10 to
15 knots. a chance of snow early in the morning. freezing spray
early in the morning. waves 6 to 9 feet. waves occasionally
around 12 feet. 
.monday...west winds 15 to 20 knots becoming southwest 20 to
25 knots with gusts to around 30 knots until early evening...then
becoming west 15 to 20 knots in the late evening and early
morning. a chance of snow. waves 4 to 6 feet building to 8 to
12 feet. waves occasionally around 15 feet. 


$$

fzus63 kdtx 111455
glflh 
expires:202512112300;;394252

open lake forecast for lake huron
national weather service detroit/pontiac mi
955 am est thu dec 11 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...high pressure, 30.10 inches, builds from the midwest
today into the great lakes tonight and friday. this is followed
by low pressure, 29.70 inches, moving in from central canada into
northern ontario friday night and saturday. sporadic gale force
wind gusts are possible with this system.


lhz363-462-112300-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
lake huron from port austin to harbor beach beyond 5nm off shore-
955 am est thu dec 11 2025

.rest of today...northwest winds 20 to 25 knots. numerous snow
showers late in the morning...then scattered snow showers in the
afternoon. waves 8 to 12 feet. waves occasionally around 15 feet.
.tonight...northwest winds 15 to 20 knots becoming west 10 to
15 knots after midnight. scattered snow showers in the evening.
waves 4 to 6 feet. 
.friday...west winds 10 to 15 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet early in the afternoon. waves occasionally around
8 feet. 
.friday night...southwest winds 10 to 15 knots increasing to
20 to 25 knots. a chance of snow. waves 2 to 4 feet building to
5 to 7 feet in the late evening and overnight. waves occasionally
around 10 feet. 
.saturday...west winds 20 to 25 knots. gusts to 30 knots. a
chance of snow. freezing spray. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.sunday...northwest winds to 30 knots decreasing to 15 to
20 knots. a chance of snow early in the morning. freezing spray
early in the morning. waves 8 to 12 feet. waves occasionally
around 15 feet. 
.monday...west winds 15 to 20 knots becoming southwest to
30 knots with gusts to 35 knot gales until early evening...then
becoming west 20 to 25 knots in the late evening and early
morning. a chance of snow. waves 5 to 7 feet building to 8 to
12 feet. waves occasionally around 15 feet. 


$$

fzus63 kmkx 111456
glflm 
expires:202512112215;;394266

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
856 am cst thu dec 11 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...

northwest winds will continue to diminish today as high pressure 
around 30.1 inches moves in from the northwest. a period of west 
to northwest gales may return friday night through saturday night
as a strong arctic cold front moves through the region. heavy 
freezing spray will likely develop during this period as the 
colder airmass moves in. strong high pressure around 30.8 inches
will then move southeast through the region sunday and to the 
south early next week. gusty winds may return early next week 
behind the exiting high.


lmz261-362-364-366-563-565-567-868-112215-
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 point betsie to manistee mi 5 nm offshore to
mid lake-
lake michigan from rock island passage to sturgeon bay wi-
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-
856 am cst thu dec 11 2025

sheboygan wi to pentwater mi north...

.rest of today...northwest winds 10 to 20 kt diminishing to 10 to
15 kt. slight chance of snow showers through mid morning. waves
4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. 
.tonight...northwest winds 10 to 15 kt diminishing to 5 to 10 kt.
waves 1 to 3 ft subsiding to 1 to 2 ft. 
.friday...northwest winds 10 to 15 kt becoming southwest 10 to
20 kt. chance of snow in the afternoon. waves 1 to 3 ft building
to 2 to 4 ft. 
.friday night...west winds to 30 kt increasing to gales to 35 kt.
snow likely in the evening, then chance of snow overnight.
freezing spray overnight. waves 5 to 8 ft occasionally to 10 ft
building to 8 to 11 ft occasionally to 14 ft. 
.saturday...west gales to 35 kt becoming northwest. freezing
spray. chance of snow. waves 8 to 11 ft occasionally to 14 ft
subsiding to 6 to 9 ft occasionally to 12 ft. 
.saturday night...northwest gales to 35 kt increasing to gales to
40 kt. freezing spray. chance of snow. waves 8 to 11 ft
occasionally to 14 ft. 
.sunday...northwest gales to 35 kt diminishing to 15 to 25 kt.
freezing spray. waves 8 to 11 ft occasionally to 14 ft subsiding
to 6 to 9 ft occasionally to 12 ft. 
.monday...southwest gales to 40 kt becoming west gales to 35 kt.
freezing spray. chance of snow. waves 10 to 14 ft occasionally to
18 ft.  

$$

fzus63 kmkx 111456
glflm 
expires:202512112215;;394267

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
856 am cst thu dec 11 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...

northwest winds will continue to diminish today as high pressure 
around 30.1 inches moves in from the northwest. a period of west 
to northwest gales may return friday night through saturday night
as a strong arctic cold front moves through the region. heavy 
freezing spray will likely develop during this period as the 
colder airmass moves in. strong high pressure around 30.8 inches
will then move southeast through the region sunday and to the 
south early next week. gusty winds may return early next week 
behind the exiting high.


lmz080-669-671-673-675-777-779-870-872-874-876-878-112215-
lake michigan from michigan city in to st. joseph mi 5 nm
offshore to mid lake-
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 north point light to wind point wi 5 nm
offshore to mid lake-
lake michigan from wind point wi to winthrop harbor il 5 nm
offshore to mid lake-
lake michigan from winthrop harbor to wilmette harbor il 5 nm
offshore to mid lake-
lake michigan from wilmette harbor il to michigan city in 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-
lake michigan from holland to grand haven mi 5 nm offshore to mid
lake-
lake michigan from south haven to holland mi 5 nm offshore to mid
lake-
lake michigan from st. joseph to south haven mi 5 nm offshore to
mid lake-
856 am cst thu dec 11 2025

sheboygan wi to pentwater mi south...

.rest of today...northwest winds 10 to 20 kt becoming west 5 to
10 kt. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.tonight...west winds 5 to 10 kt veering to east. slight chance
of snow. waves 1 to 3 ft subsiding to 1 to 2 ft. 
.friday...northeast winds 5 to 10 kt veering to southwest 10 to
15 kt late in the morning, then increasing to 10 to 20 kt early
in the afternoon becoming west late. chance of snow in the
afternoon. waves 1 to 3 ft building to 3 to 5 ft.
.friday night...west winds to 30 kt increasing to gales to 35 kt.
freezing spray. chance of snow. waves 6 to 9 ft occasionally to
12 ft building to 8 to 12 ft occasionally to 16 ft. 
.saturday...northwest winds to 30 kt. heavy freezing spray in the
morning, then freezing spray in the afternoon. chance of snow.
waves 8 to 12 ft occasionally to 16 ft. 
.saturday night...northwest winds to 30 kt increasing to gales to
35 kt. heavy freezing spray. chance of snow. waves 10 to 14 ft
occasionally to 18 ft. 
.sunday...northwest gales to 35 kt diminishing to 30 kt. freezing
spray. waves 10 to 14 ft occasionally to 18 ft. 
.monday...southwest gales to 40 kt becoming west. freezing spray.
waves 12 to 16 ft occasionally to 21 ft.  

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394463

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz162-112100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est thu dec 11 2025 /900 am cst thu dec 11 2025/

.rest of today...northwest winds 5 to 15 knots backing west.
waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming northwest 20 to
30 knots by mid afternoon. snow showers 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. a chance of snow
showers. heavy freezing spray after midnight. waves building to
3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. a chance of snow showers. waves 3 to
6 feet occasionally to 8 feet. 
.saturday night...northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots becoming southwest gales
to 35 knots. waves subsiding to calm to 2 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.monday...west winds 20 to 30 knots becoming southwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394464

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz263-112100-
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-
1000 am est thu dec 11 2025

.rest of today...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...west winds 5 to 15 knots. waves calm to 2 feet. 
.friday...west winds 5 to 15 knots increasing to 15 to 25 knots.
a chance of snow showers in the morning, then snow showers in the
afternoon. waves building to 3 to 6 feet occasionally to 8 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 gales to 35 knots. heavy freezing spray. a
chance of snow showers. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.saturday night...north gales to 35 knots diminishing to 20 to
30 knots after midnight. a chance of snow showers in the evening.
heavy freezing spray. waves subsiding to 3 to 6 feet occasionally
to 8 feet. 
.sunday...northwest winds 15 to 25 knots becoming southwest gales
to 40 knots. freezing spray. a chance of snow showers. waves
subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.monday...west gales to 35 knots becoming northwest 10 to
20 knots. freezing spray. waves subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394465

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz264-112100-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 am est thu dec 11 2025

.rest of today...north winds 10 to 20 knots becoming northwest
5 to 15 knots. waves 3 to 5 feet occasionally to 7 feet subsiding
to calm to 2 feet. 
.tonight...north winds 5 to 15 knots backing northwest late.
waves calm to 2 feet. 
.friday...west winds 5 to 15 knots increasing to 15 to 25 knots.
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 winds 20 to 30 knots increasing to
gales to 35 knots after midnight. 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 7 to 10 feet
occasionally to 13 feet. 
.saturday night...north gales to 35 knots diminishing to 20 to
30 knots after midnight. heavy freezing spray. a chance of snow
showers. waves subsiding to 6 to 9 feet occasionally to 11 feet. 
.sunday...northwest winds 20 to 30 knots becoming southwest gales
to 35 knots. freezing spray. a chance of snow showers. waves
subsiding to 1 to 3 feet, then building to 8 to 11 feet
occasionally to 14 feet. 
.monday...northwest gales to 35 knots diminishing to 15 to
25 knots. freezing spray. a chance of snow showers. waves
subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394466

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz265-112100-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am est thu dec 11 2025

.rest of today...northwest winds 15 to 25 knots diminishing to
10 to 20 knots by mid afternoon. a slight chance of freezing
drizzle and snow showers. waves 3 to 5 feet occasionally to
7 feet subsiding to 1 to 3 feet. 
.tonight...northwest winds 10 to 20 knots backing west late. a
slight chance of snow showers in the evening. waves subsiding to
calm to 2 feet. 
.friday...west winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. 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. waves
building to 7 to 10 feet occasionally to 13 feet. 
.saturday...northwest gales to 40 knots. freezing spray. snow
showers. waves subsiding to 6 to 9 feet occasionally to 11 feet,
then building to 7 to 10 feet occasionally to 13 feet. 
.saturday night...northwest gales to 40 knots becoming north
gales to 35 knots after midnight. freezing spray. snow showers in
the evening. a chance of snow showers after midnight. waves
building to 8 to 12 feet occasionally to 15 feet. 
.sunday...northwest winds 20 to 30 knots backing southwest.
freezing spray. a chance of snow showers. waves subsiding to calm
to 2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.monday...west winds 20 to 30 knots becoming northwest 15 to
25 knots. a chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394467

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz266-112100-
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-
1000 am est thu dec 11 2025

.rest of today...north winds 15 to 25 knots backing northwest. a
chance of snow showers and a slight chance of freezing drizzle.
waves 5 to 8 feet occasionally to 10 feet subsiding to 2 to
4 feet. 
.tonight...northwest winds 10 to 20 knots. a slight chance of
snow showers. waves subsiding to calm to 2 feet. 
.friday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. a chance of snow showers. waves
building to 2 to 4 feet. 
.friday night...west gales to 35 knots veering northwest after
midnight. freezing spray. snow showers. waves building to 10 to
14 feet occasionally to 18 feet. 
.saturday...northwest gales to 40 knots. freezing spray. snow
showers. waves 10 to 14 feet occasionally to 18 feet. 
.saturday night...north gales to 35 knots. freezing spray. snow
showers in the evening. a chance of snow showers after midnight.
waves subsiding to 9 to 12 feet occasionally to 15 feet. 
.sunday...north winds 20 to 30 knots becoming southwest gales to
35 knots. freezing spray. a chance of snow showers. waves
subsiding to 2 to 4 feet, then building to 6 to 9 feet
occasionally to 11 feet. 
.monday...west gales to 35 knots becoming northwest 20 to
30 knots. freezing spray. a chance of snow showers. waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 111500
glfls 
expires:202512112100;;394468

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 11 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...

as a 29.1 inch low pushes farther into the maritime provinces this 
morning, broad 30.1 inch ridging weakens to 30.0 inches while moving 
over the mississippi valley. this ridge then moves over the great 
lakes friday morning before a trough quickly swings south from 
northern ontario, deepening from 29.9 inches to 29.7 inches through 
the afternoon to evening hours of friday. as this low exits to the 
east saturday, a 30.6 inch high settles over the dakotas saturday 
evening. this high builds to 30.7 inches over illinois sunday 
evening and towards the virginias by monday morning. in its wake, a 
29.9 inch trough will pass over lake superior monday afternoon 
associated with a 29.7 inch low over hudson bay. 30.1 inch ridging 
resumes over the lake monday night into tuesday ahead of a 29.2 inch 
low moving into manitoba tuesday afternoon.



lsz267-112100-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am est thu dec 11 2025

.rest of today...north winds 15 to 25 knots backing northwest by
mid afternoon. a slight chance of snow showers. waves 4 to 7 feet
occasionally to 9 feet subsiding to 2 to 4 feet. 
.tonight...northwest winds 10 to 20 knots. a slight chance of
snow showers. waves subsiding to calm to 2 feet. 
.friday...northwest winds 10 to 20 knots backing southwest by mid
afternoon. a chance of snow showers. waves building to 1 to
3 feet. 
.friday night...west winds 20 to 30 knots increasing to 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. freezing spray. snow
showers. waves subsiding to 9 to 12 feet occasionally to 15 feet.
.saturday night...north winds 20 to 30 knots. freezing spray.
snow showers in the evening. a chance of snow showers after
midnight. waves subsiding to 6 to 9 feet occasionally to 11 feet.
.sunday...north winds 15 to 25 knots becoming southwest gales to
35 knots. freezing spray. a chance of snow showers, then snow
showers likely. waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.monday...southwest gales to 35 knots becoming northwest 15 to
25 knots. freezing spray. snow showers, then a chance of snow
showers. waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$