fzus63 kdtx 172046
glflh 
expires:202512180500;;756998

open lake forecast for lake huron
national weather service detroit/pontiac mi
346 pm est wed dec 17 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, 29.10 inches, tracks from the dakotas to
lake superior thursday. southerly winds increase thursday before 
shifting to the northwest as a cold front comes through thursday 
night. gale warnings are in effect through friday night with 
potential for snow squalls friday. 


lhz361>363-462-180500-
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-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
lake huron from port austin to harbor beach beyond 5nm off shore-
346 pm est wed dec 17 2025

...gale warning in effect from midnight est tonight through
friday evening...

.tonight...southwest winds 5 to 10 knots becoming south 15 to
20 knots late in the evening...then increasing to 20 to 25 knots
with gusts to 35 knot gales after midnight. waves 3 to 5 feet
building to 8 to 12 feet after midnight. waves occasionally
around 15 feet. 
.thursday...south winds to 30 knots with gusts to 40 knot gales.
a chance of rain in the morning...then rain in the afternoon.
waves 12 to 16 feet. waves occasionally around 20 feet. 
.thursday night...south winds 20 to 25 knots becoming southwest
to 30 knots after midnight. gusts to 35 knot gales. rain in the
evening...then a chance of snow after midnight. waves 10 to
14 feet. waves occasionally around 18 feet. 
.friday...west winds to 30 knots increasing to 35 knot gales in
the late morning and early afternoon...then decreasing to
30 knots early in the afternoon. a chance of snow. waves 12 to
16 feet. waves occasionally around 20 feet. 
.friday night...northwest winds 15 to 20 knots with gusts to
around 30 knots becoming west 10 to 15 knots in the late evening
and early morning...then becoming southwest 15 to 20 knots after
midnight. waves 8 to 12 feet subsiding to 4 to 6 feet after
midnight. waves occasionally around 15 feet. 
.saturday...south winds 20 to 25 knots becoming west to 30 knots
late in the evening. gusts to 35 knot gales. a chance of snow. a
chance of rain late in the morning. waves 8 to 12 feet building
to 12 to 16 feet late in the evening. waves occasionally around
20 feet. 
.sunday...west winds to 30 knots with gusts to 35 knot gales
decreasing to 15 to 20 knots. waves 12 to 16 feet subsiding to
6 to 9 feet until early morning. waves occasionally around
20 feet. 
.monday...west winds 15 to 20 knots backing to the southwest
early in the evening...then becoming south 20 to 25 knots in the
late evening and early morning. waves 4 to 6 feet building to
6 to 9 feet in the late evening and early morning. waves
occasionally around 12 feet. 


$$

fzus63 kdtx 171451
glflh 
expires:202512172300;;741486

open lake forecast for lake huron
national weather service detroit/pontiac mi
issued by national weather service grand rapids mi
951 am est wed dec 17 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...a cold front has moved through the northern half of
lake huron this morning and will continue to shift south. gale 
warnings remain in effect for the northern portions of lake huron 
through this morning. an even stronger system will affect the 
region thursday and friday bringing rain, snow, and strong winds. 
gale warnings will likely be required over much of lake huron.


lhz363-462>464-172300-
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-
951 am est wed dec 17 2025

.rest of today...west winds 20 to 25 knots with gusts to around
30 knots decreasing to 5 to 10 knots. waves 6 to 9 feet. waves
occasionally around 12 feet. 
.tonight...southwest winds 5 to 10 knots becoming south 15 to
20 knots late in the evening...then increasing to 20 to 25 knots
with gusts to 35 knot gales after midnight. waves 3 to 5 feet
building to 8 to 12 feet after midnight. waves occasionally
around 15 feet. 
.thursday...south winds to 30 knots with gusts to 35 knot gales.
a chance of rain in the morning...then rain in the afternoon.
waves 10 to 14 feet. waves occasionally around 18 feet. 
.thursday night...south winds to 30 knots veering to the
southwest after midnight. gusts to 35 knot gales. rain in the
evening...then scattered rain and snow showers after midnight.
waves 10 to 14 feet. waves occasionally around 18 feet. 
.friday...west at 35 knot gales decreasing to 15 to 20 knots with
gusts to around 30 knots late in the afternoon. scattered showers
in the morning. scattered snow showers. waves 12 to 16 feet
subsiding to 6 to 9 feet late in the evening. waves occasionally
around 20 feet. a gale warning may be needed. 
.saturday...south winds 20 to 25 knots becoming west to 30 knots
in the late evening and early morning. a chance of snow. a chance
of rain in the late morning and early afternoon. waves 6 to
9 feet. waves occasionally around 12 feet. 
.sunday...west winds to 30 knots decreasing to 15 to 20 knots.
waves 6 to 9 feet. waves occasionally around 12 feet. 


$$

fzus63 kdtx 171451
glflh 
expires:202512172300;;741485

open lake forecast for lake huron
national weather service detroit/pontiac mi
issued by national weather service grand rapids mi
951 am est wed dec 17 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...a cold front has moved through the northern half of
lake huron this morning and will continue to shift south. gale 
warnings remain in effect for the northern portions of lake huron 
through this morning. an even stronger system will affect the 
region thursday and friday bringing rain, snow, and strong winds. 
gale warnings will likely be required over much of lake huron.


lhz361-362-172300-
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-
951 am est wed dec 17 2025

...gale warning in effect until noon est today...

.rest of today...west winds to 30 knots with gusts to 35 knot
gales decreasing to 10 to 15 knots. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.tonight...southwest winds 10 to 15 knots becoming south 15 to
20 knots late in the evening...then increasing to 20 to 25 knots
with gusts to around 30 knots after midnight increasing to
30 knots with gusts to 35 knot gales early in the morning. waves
3 to 5 feet building to 8 to 12 feet after midnight. waves
occasionally around 15 feet. 
.thursday...south winds to 30 knots decreasing to 20 to 25 knots
early in the afternoon. gusts to 35 knot gales. a chance of rain
in the morning...then rain in the afternoon. waves 12 to 16 feet.
waves occasionally around 20 feet. 
.thursday night...south winds 20 to 25 knots becoming southwest
to 30 knots after midnight. rain and numerous snow showers in the
evening...then numerous showers and scattered snow showers after
midnight. waves 10 to 14 feet. waves occasionally around 18 feet.
.friday...west winds to 30 knots with gusts to 35 knot gales
decreasing to 10 to 15 knots. scattered snow showers. waves 12 to
16 feet subsiding to 5 to 7 feet late in the evening. waves
occasionally around 20 feet. 
.saturday...southwest winds 20 to 25 knots becoming west to
30 knots in the late evening and early morning. gusts to 35 knot
gales. snow likely early in the morning...then a chance of snow
until early evening. waves 8 to 12 feet. waves occasionally
around 15 feet. 
.sunday...west winds to 30 knots with gusts to 35 knot gales
decreasing to 10 to 15 knots. waves 6 to 9 feet subsiding to 4 to
6 feet in the late evening and early morning. waves occasionally
around 12 feet. 


$$

fzus63 kmkx 172057
glflm 
expires:202512180430;;757385

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
257 pm cst wed dec 17 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...

low pressure around 29.1 inches will track eastward along the 
canadian border tonight into thursday, bringing southerly gales 
from late evening through thursday morning. a lull in the gales 
may occur thursday afternoon as low pressure crosses the upper 
peninsula of michigan. winds become west and accelerate back to 
gale force behind a strong cold front thursday evening, then 
eventually turn northwest thursday night. a gale warning is in 
effect for all open waters of lake michigan late this evening 
through early friday morning.

moderate freezing spray is expected to accompany the gales late 
thursday night into friday morning as a bitter cold airmass 
briefly enters our region. 

friday night, another low pressure system swings through southern
canada, bringing gusty south-southwest winds once again. gales are
possible, but confidence is lower with timing and intensity at
this time.


lmz261-362-364-366-563-565-567-868-180430-
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-
257 pm cst wed dec 17 2025

sheboygan wi to pentwater mi north...

...gale warning in effect from 11 pm cst this evening through
friday morning...

.tonight...south winds 15 to 25 kt increasing to gales to 40 kt.
chance of sprinkles and slight chance of rain overnight. waves
3 to 5 ft building to 12 to 16 ft occasionally to 21 ft. 
.thursday...south gales to 40 kt diminishing to gales to 35 kt
late in the morning, then becoming southwest early in the
afternoon diminishing to 30 kt late. rain in the morning, then
chance of rain in the afternoon. waves 12 to 16 ft occasionally
to 21 ft subsiding to 8 to 12 ft occasionally to 16 ft. 
.thursday night...west gales to 35 kt becoming northwest gales to
40 kt. chance of snow in the evening, then snow likely overnight.
freezing spray overnight. waves 8 to 11 ft occasionally to 14 ft
building to 12 to 16 ft occasionally to 21 ft. 
.friday...northwest gales to 40 kt diminishing to 30 kt in the
afternoon. freezing spray in the morning. waves 10 to 14 ft
occasionally to 18 ft subsiding to 7 to 10 ft occasionally to
13 ft. 
.friday night...southwest winds to 30 kt becoming south. chance
of snow. waves 4 to 6 ft occasionally to 8 ft building to 8 to
11 ft occasionally to 14 ft. 
.saturday...south winds to 30 kt becoming west. chance of snow.
waves 8 to 11 ft occasionally to 14 ft subsiding to 7 to 10 ft
occasionally to 13 ft. 
.saturday night...west gales to 35 kt. waves 8 to 12 ft
occasionally to 16 ft. 
.sunday...northwest winds to 30 kt diminishing to 15 to 25 kt.
waves 8 to 11 ft occasionally to 14 ft subsiding to 5 to 8 ft
occasionally to 10 ft. 
.monday...southwest winds 15 to 25 kt becoming south. waves 5 to
8 ft occasionally to 10 ft building to 7 to 10 ft occasionally to
13 ft.  

$$

fzus63 kmkx 172057
glflm 
expires:202512180430;;757386

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
257 pm cst wed dec 17 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...

low pressure around 29.1 inches will track eastward along the 
canadian border tonight into thursday, bringing southerly gales 
from late evening through thursday morning. a lull in the gales 
may occur thursday afternoon as low pressure crosses the upper 
peninsula of michigan. winds become west and accelerate back to 
gale force behind a strong cold front thursday evening, then 
eventually turn northwest thursday night. a gale warning is in 
effect for all open waters of lake michigan late this evening 
through early friday morning.

moderate freezing spray is expected to accompany the gales late 
thursday night into friday morning as a bitter cold airmass 
briefly enters our region. 

friday night, another low pressure system swings through southern
canada, bringing gusty south-southwest winds once again. gales are
possible, but confidence is lower with timing and intensity at
this time.


lmz080-669-671-673-675-777-779-870-872-874-876-878-180430-
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-
257 pm cst wed dec 17 2025

sheboygan wi to pentwater mi south...

...gale warning in effect from 11 pm cst this evening through
friday morning...

.tonight...south winds 15 to 25 kt increasing to gales to 35 kt.
chance of rain overnight. waves 3 to 5 ft building to 10 to 14 ft
occasionally to 18 ft. 
.thursday...south gales to 35 kt becoming southwest to 30 kt. 
rain in the morning, then chance of rain in the afternoon. waves 
10 to 14 ft occasionally to 18 ft. 
.thursday night...west gales to 40 kt. chance of snow. freezing
spray overnight. waves 14 to 18 ft occasionally to 23 ft. 
.friday...northwest gales to 40 kt becoming west to 30 kt in the
afternoon. freezing spray. waves 14 to 18 ft occasionally to
23 ft subsiding to 10 to 14 ft occasionally to 18 ft. 
.friday night...southwest winds to 30 kt becoming south. waves
4 to 7 ft occasionally to 9 ft building to 8 to 11 ft
occasionally to 14 ft. 
.saturday...south winds to 30 kt becoming west. chance of snow.
waves 8 to 12 ft occasionally to 16 ft subsiding to 7 to 10 ft
occasionally to 13 ft. 
.saturday night...northwest gales to 35 kt. waves 10 to 14 ft
occasionally to 18 ft. 
.sunday...northwest winds to 30 kt diminishing to 15 to 25 kt.
waves 10 to 14 ft occasionally to 18 ft subsiding to 6 to 9 ft
occasionally to 12 ft. 
.monday...south winds to 30 kt. waves 7 to 10 ft occasionally to
13 ft.  

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757645

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz266-180900-
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-
400 pm est wed dec 17 2025

...gale warning in effect through friday morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
40 knots by midnight. a chance of freezing drizzle in the
evening. a chance of drizzle and snow showers. a chance of rain
showers after midnight. waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet. 
.thursday...south gales to 35 knots diminishing to 20 to 30 knots
by late morning, then becoming southwest gales to 35 knots by mid
afternoon. drizzle likely in the morning. rain showers. snow
showers in the afternoon. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 7 to 10 feet
occasionally to 13 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
rain showers in the evening. snow showers. waves building to
15 to 20 feet occasionally to 25 feet. 
.friday...north gales to 40 knots diminishing to 15 to 25 knots
in the afternoon. freezing spray. a chance of snow showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...south gales to 35 knots. a chance of snow showers
in the evening, then snow showers likely after midnight. freezing
spray after midnight. waves subsiding to 2 to 4 feet, then
building to 7 to 10 feet occasionally to 13 feet. 
.saturday...south winds 20 to 30 knots becoming west gales to
40 knots in the afternoon. snow showers likely in the morning,
then a chance of snow showers in the afternoon. waves building to
10 to 14 feet occasionally to 18 feet. 
.saturday night...west gales to 45 knots becoming northwest gales
to 40 knots after midnight. freezing spray. snow showers likely
in the evening. a chance of snow showers after midnight. waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet. 
.sunday...northwest winds 20 to 30 knots becoming west 15 to
25 knots. freezing spray. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...south winds 15 to 25 knots increasing to 20 to
30 knots. a chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757646

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz267-180900-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm est wed dec 17 2025

...gale warning in effect through friday morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...southwest winds 15 to 25 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
40 knots by midnight. a chance of snow showers. a chance of
drizzle after midnight. waves building to 7 to 10 feet
occasionally to 13 feet. 
.thursday...south gales to 35 knots diminishing to 15 to
25 knots. drizzle likely in the morning. rain showers. waves
subsiding to 2 to 4 feet. 
.thursday night...west winds 20 to 30 knots becoming northwest
gales to 35 knots by midnight, then becoming north gales to
40 knots late. rain showers in the evening. snow showers.
freezing spray after midnight. waves building to 10 to 14 feet
occasionally to 18 feet. 
.friday...north gales to 35 knots diminishing to 15 to 25 knots
in the afternoon. freezing spray. snow showers likely in the
morning. a slight chance of snow showers in the afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.friday night...southeast winds 15 to 25 knots becoming south
gales to 35 knots after midnight. a chance of snow showers in the
evening, then snow showers likely after midnight. freezing spray
after midnight. waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.saturday...south gales to 35 knots veering west in the
afternoon. snow showers. waves building to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...west gales to 40 knots becoming northwest gales
to 35 knots after midnight. freezing spray. snow showers. waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet. 
.sunday...northwest winds 20 to 30 knots becoming west 15 to
25 knots. freezing spray. a chance of snow showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...south winds 15 to 25 knots increasing to 20 to
30 knots. a chance of snow showers, then snow showers likely.
waves building to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757641

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz162-180900-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm est wed dec 17 2025 /300 pm cst wed dec 17 2025/

...gale warning in effect from thursday afternoon through late
thursday night...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 15 to 25 knots. waves 1 to
3 feet. 
.tonight...south winds 20 to 30 knots veering southwest late. a
chance of freezing drizzle in the evening. a chance of drizzle
and a slight chance of snow showers. a chance of rain showers
after midnight. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.thursday...southwest winds 15 to 25 knots veering west by late
morning, then becoming north gales to 35 knots by mid afternoon.
a chance of drizzle in the morning. a chance of rain showers.
snow showers likely in the afternoon. waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 6 to 9 feet
occasionally to 11 feet. 
.thursday night...north gales to 40 knots. heavy freezing spray.
snow showers likely in the evening. a slight chance of snow
showers after midnight. waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.friday...north winds 15 to 25 knots becoming southeast 5 to
15 knots in the afternoon. a chance of snow showers in the
afternoon. waves subsiding to calm to 2 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. a chance of snow showers. waves building to 4 to
7 feet occasionally to 9 feet. 
.saturday...west winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. freezing spray in the afternoon. waves
building to 4 to 8 feet occasionally to 10 feet. 
.saturday night...west winds 20 to 30 knots becoming northwest
15 to 25 knots after midnight. freezing spray in the evening.
waves subsiding to 2 to 4 feet. 
.sunday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.monday...south winds 10 to 20 knots veering southwest. waves
building to 1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757642

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz263-180900-
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-
400 pm est wed dec 17 2025

...gale warning in effect from thursday afternoon through friday
morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 10 to 20 knots. a slight
chance of snow showers. waves 2 to 4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
35 knots by midnight, then becoming southwest 20 to 30 knots
late. a chance of snow showers and freezing drizzle in the
evening. a chance of drizzle. a chance of rain showers after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.thursday...southwest winds 15 to 25 knots becoming north gales
to 40 knots. a chance of rain showers in the morning, then snow
showers, possibly mixed with rain in the afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
7 to 10 feet occasionally to 13 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
snow showers. waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. 
.friday...north gales to 35 knots becoming southeast 10 to
20 knots in the afternoon. freezing spray in the morning. a
slight chance of snow showers. waves subsiding to 1 to 3 feet. 
.friday night...south winds 20 to 30 knots. a chance of snow
showers. freezing spray after midnight. waves building to 5 to
8 feet occasionally to 10 feet. 
.saturday...southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. a chance of snow showers. freezing
spray in the afternoon. waves building to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...west gales to 35 knots becoming northwest 20 to
30 knots after midnight. freezing spray. waves subsiding to 4 to
7 feet occasionally to 9 feet. 
.sunday...northwest winds 10 to 20 knots backing west. waves
subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots becoming southwest 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757643

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz264-180900-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm est wed dec 17 2025

...gale warning in effect from thursday afternoon through friday
morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 10 to 20 knots. a slight
chance of snow showers. waves 2 to 4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
35 knots by midnight. a chance of drizzle and freezing drizzle in
the evening. a chance of snow showers. a chance of rain showers
after midnight. waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet. 
.thursday...south winds 15 to 25 knots increasing to gales to
35 knots by late morning, then becoming north gales to 40 knots
by mid afternoon. a slight chance of snow showers in the morning.
rain showers likely. snow showers in the afternoon. waves
subsiding to 3 to 6 feet occasionally to 8 feet, then building to
8 to 11 feet occasionally to 14 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
snow showers. waves building to 12 to 17 feet occasionally to
21 feet, then subsiding to 11 to 15 feet occasionally to 19 feet.
.friday...north gales to 40 knots diminishing to 10 to 20 knots
in the afternoon. heavy freezing spray in the morning. a slight
chance of snow showers. waves subsiding to 1 to 3 feet. 
.friday night...south winds 20 to 30 knots increasing to gales to
35 knots after midnight. a chance of snow showers. freezing spray
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.saturday...southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. a chance of snow showers. freezing
spray in the afternoon. waves subsiding to 6 to 9 feet
occasionally to 11 feet, then building to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...northwest gales to 40 knots. freezing spray.
waves subsiding to 6 to 9 feet occasionally to 11 feet. 
.sunday...northwest winds 15 to 25 knots becoming west 10 to
20 knots. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots becoming southwest 15 to
25 knots. a chance of snow showers. waves building to 3 to 6 feet
occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 172101
glfls 
expires:202512180900;;757644

open lake forecast for lake superior
national weather service marquette mi
400 pm est wed dec 17 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...

weak ridging of 29.9 inches exits lake superior this evening before 
a 28.9 inch alberta clipper tracks from the canadian prairies to 
lake superior tonight, weakening to 29.1 inches as it does so. on 
thursday the low tracks east over the lake before reaching quebec by 
friday. a 30.0 inch ridge then returns to the lake on friday via a 
30.2 inch high over the lower mississippi valley and a weakening 
30.0 inch high over northern ontario. another low pressure of around 
29.5 inches tracks north of lake superior on saturday. this is then 
followed by a 30.3 inch high over the canadian prairies sliding 
southeast into the great lakes late this weekend, building to 30.6 
inches by monday morning.



lsz265-180900-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm est wed dec 17 2025

...gale warning in effect through friday morning...
...heavy freezing spray warning in effect from thursday evening
through friday morning...

.late this afternoon...south winds 15 to 25 knots. waves 1 to
3 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
40 knots by midnight. a chance of drizzle, freezing drizzle and
snow showers. waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. 
.thursday...south winds 20 to 30 knots veering west by mid
afternoon. a chance of rain showers in the morning, then rain
showers likely with pockets of snow showers in the afternoon.
waves subsiding to 1 to 3 feet, then building to 4 to 7 feet
occasionally to 9 feet. 
.thursday night...north gales to 35 knots increasing to gales to
45 knots with a few storm force gusts to 50 knots possible by
midnight, then diminishing to gales to 45 knots late. freezing
spray. snow showers. waves building to 12 to 17 feet occasionally
to 21 feet. 
.friday...north gales to 40 knots becoming northwest 15 to
25 knots in the afternoon. freezing spray in the morning. a
chance of snow showers. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.friday night...south winds 20 to 30 knots increasing to gales to
35 knots after midnight. a chance of snow showers. freezing spray
after midnight. waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.saturday...southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. snow showers likely in the morning,
then a chance of snow showers in the afternoon. freezing spray in
the afternoon. waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 8 to 11 feet occasionally to 14 feet. 
.saturday night...west gales to 45 knots becoming northwest gales
to 40 knots after midnight. freezing spray. a chance of snow
showers. waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet. 
.sunday...northwest winds 20 to 30 knots becoming west 15 to
25 knots. waves subsiding to calm to 2 feet. 
.monday...south winds 15 to 25 knots. a chance of snow showers.
waves building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$