fzus63 kdtx 170822
glflh 
expires:202512171630;;726221

open lake forecast for lake huron
national weather service detroit/pontiac mi
322 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 is tracking through the central great
lakes this morning. gale warnings remain in effect for the
northern portions of lake huron during this timeframe. 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.


lhz361-362-171630-
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-
322 am est wed dec 17 2025

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

.today...west winds 20 to 25 knots with gusts to 35 knot
gales...becoming northwest 20 to 25 knots with gusts to around 30
knots early in the afternoon becoming west 10 to 20 knots late in
the afternoon. waves 8 to 12 feet. waves occasionally around 15 
feet. 
.tonight...south winds 15 to 20 knots in the evening...then 
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 kdtx 170822
glflh 
expires:202512171630;;726222

open lake forecast for lake huron
national weather service detroit/pontiac mi
322 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 is tracking through the central great
lakes this morning. gale warnings remain in effect for the
northern portions of lake huron during this timeframe. 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>464-171630-
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-
322 am est wed dec 17 2025

.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 6 to 9 feet after midnight. waves occasionally around
12 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 kmkx 170925
glflm 
expires:202512171630;;730403

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
325 am 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...

breezy west to northwest winds will subside through this morning,
with light and variable winds this afternoon and building south 
winds after dark this evening.

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


lmz080-669-671-673-675-777-779-870-872-874-876-878-171630-
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-
325 am cst wed dec 17 2025

sheboygan wi to pentwater mi south...

...gale warning in effect from this evening through friday
morning...

.today...northwest winds to 30 kt diminishing to 10 to 20 kt late
this morning, then becoming west 10 to 15 kt early this afternoon
backing to south 10 to 20 kt late. waves 5 to 8 ft occasionally
to 10 ft subsiding to 2 to 4 ft. 
.tonight...south winds 15 to 25 kt increasing to gales to 35 kt.
slight 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 west to 30 kt. rain in
the morning, then rain likely in the afternoon. waves 10 to 14 ft
occasionally to 18 ft subsiding to 8 to 12 ft occasionally to
16 ft. 
.thursday night...west gales to 40 kt. chance of snow and rain in
the evening, then chance of snow overnight. freezing spray
overnight. waves 12 to 16 ft occasionally to 21 ft. 
.friday...northwest gales to 40 kt becoming west 15 to 25 kt in
the afternoon. freezing spray in the morning. waves 12 to 16 ft
occasionally to 21 ft subsiding to 8 to 11 ft occasionally to
14 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. waves 8 to 12 ft
occasionally to 16 ft subsiding to 7 to 10 ft occasionally to
13 ft. 
.sunday...northwest winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 8 to 11 ft occasionally to 14 ft subsiding to 4 to 7 ft
occasionally to 9 ft.  

$$

fzus63 kmkx 170925
glflm 
expires:202512171630;;730402

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
325 am 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...

breezy west to northwest winds will subside through this morning,
with light and variable winds this afternoon and building south 
winds after dark this evening.

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


lmz261-362-364-366-563-565-567-868-171630-
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-
325 am cst wed dec 17 2025

sheboygan wi to pentwater mi north...

...gale warning in effect from this evening through friday
morning...

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

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727784

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz264-172100-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am est wed dec 17 2025

...gale warning in effect until 7 am est this morning...
...gale watch in effect from thursday afternoon through friday
morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727785

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz265-172100-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am est wed dec 17 2025

...gale warning in effect until 7 am est this morning...
...gale watch in effect from this evening through friday
morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727786

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz266-172100-
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 am est wed dec 17 2025

...gale warning in effect until 7 am est this morning...
...gale watch in effect from this evening through friday
morning...

.early this morning...northwest gales to 40 knots. a slight
chance of snow showers. waves 12 to 17 feet occasionally to
21 feet. 
.today...northwest gales to 35 knots becoming west 15 to 25 knots
by late morning, then backing south by mid afternoon. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.tonight...south gales to 40 knots. a chance of freezing drizzle
in the evening. a chance of snow showers and drizzle. 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 15 to 25 knots
by late morning, then becoming southwest gales to 35 knots by mid
afternoon. drizzle in the morning. rain showers, possibly mixed
with snow. 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.
a slight chance of 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. heavy freezing spray. a chance of snow showers.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...south gales to 40 knots. snow showers. freezing
spray after midnight. waves subsiding to 3 to 5 feet occasionally
to 7 feet, then building to 8 to 11 feet occasionally to 14 feet.
.saturday...west gales to 40 knots becoming northwest gales to
45 knots. a chance of snow showers. freezing spray. 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 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727787

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz267-172100-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am est wed dec 17 2025

...gale warning in effect until 7 am est this morning...
...gale watch in effect from this evening through friday
morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727782

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz162-172100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am est wed dec 17 2025 /300 am cst wed dec 17 2025/

...gale watch in effect from thursday afternoon through late
thursday night...

.early this morning...northwest winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.today...west winds 10 to 20 knots backing southwest by late
morning, then becoming south 15 to 25 knots by mid afternoon.
waves subsiding to calm to 2 feet, then building to 1 to 3 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 likely in the
evening. rain showers likely and a chance of drizzle. snow
showers likely after midnight. waves building to 4 to 7 feet
occasionally to 9 feet. 
.thursday...southwest winds 15 to 25 knots veering west by late
morning, then becoming north gales to 40 knots by mid afternoon.
rain showers likely and a chance of drizzle in the morning. snow
showers. a slight chance of rain showers in the afternoon.
freezing spray 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.
a chance of snow showers. 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 south 10 to
20 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 becoming southwest
gales to 35 knots 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 veering northwest. waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 1 to 3 feet. 
.sunday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 170900
glfls 
expires:202512172100;;727783

open lake forecast for lake superior
national weather service marquette mi
400 am 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 returns to lake superior today 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 near the upper great lakes on saturday. this is 
then followed by a 30.3 inch high over the canadian prairies diving 
southeast into the great lakes late this weekend, rising to 30.5 
inches on sunday evening.



lsz263-172100-
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 am est wed dec 17 2025

...gale watch in effect from thursday afternoon through friday
morning...

.early this morning...northwest winds 20 to 30 knots. waves 5 to
9 feet occasionally to 11 feet. 
.today...northwest winds 10 to 20 knots backing west by late
morning, then becoming south 15 to 25 knots by mid afternoon.
waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.tonight...south gales to 35 knots becoming southwest 20 to
30 knots late. a chance of snow showers and freezing drizzle in
the evening. a chance of drizzle. rain showers, possibly mixed
with snow after midnight. waves building to 4 to 8 feet
occasionally to 10 feet. 
.thursday...southwest winds 15 to 25 knots becoming north gales
to 40 knots. rain showers likely in the morning. snow showers. a
slight chance of rain showers in the afternoon. freezing spray in
the afternoon. waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 8 to 11 feet occasionally to 14 feet. 
.thursday night...north gales to 45 knots. heavy freezing spray.
snow showers likely in the evening. a chance of snow showers
after midnight. waves building to 11 to 15 feet occasionally to
19 feet, then subsiding to 9 to 12 feet occasionally to 15 feet. 
.friday...north winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon. freezing spray in the morning. 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. waves building
to 5 to 8 feet occasionally to 10 feet. 
.saturday...west gales to 40 knots becoming northwest gales to
35 knots. freezing spray. waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

note, wave height forecasts are for ice free areas.

$$