fzus63 kdtx 181443
glflh 
expires:202512182300;;802059

open lake forecast for lake huron
national weather service detroit/pontiac mi
943 am est thu dec 18 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 toward lake
superior today and draws a cold front across the southern great
lakes this evening. southerly winds increase today ahead of the
front before shifting to the northwest friday behind the front.
gale force gusts are expected today and friday, with snow squalls
possible on friday.


lhz361-362-182300-
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-
943 am est thu dec 18 2025

...gale warning in effect through friday evening...

.rest of today...south winds to 30 knots with gusts to 40 knot
gales. showers. waves 10 to 14 feet. waves occasionally around
18 feet. 
.tonight...south winds to 30 knots with gusts to 40 knot gales
decreasing to 20 to 25 knots with gusts to 40 knot gales late in
the evening...then becoming southwest 15 to 20 knots with gusts
to around 30 knots after midnight increasing to 20 to 25 knots
with gusts to around 30 knots early in the morning. showers in
the evening...then numerous showers and scattered snow showers
after midnight. waves 12 to 16 feet subsiding to 8 to 12 feet
early in the morning. waves occasionally around 20 feet. 
.friday...west winds to 30 knots becoming northwest at 35 knot
gales in the late morning and afternoon. gusts to 40 knot gales.
scattered snow showers. freezing spray. waves 12 to 16 feet.
waves occasionally around 20 feet. a gale warning may be needed. 
.friday night...northwest winds 20 to 25 knots with gusts to
around 30 knots decreasing to 10 to 15 knots in the late evening
and early morning...then becoming southwest 15 to 20 knots after
midnight. a chance of snow after midnight. waves 12 to 16 feet
subsiding to 4 to 6 feet. waves occasionally around 20 feet. 
.saturday...south winds 20 to 25 knots with gusts to around
30 knots becoming west to 30 knots with gusts to 35 knot gales
late in the evening. snow likely in the morning...then a chance
of snow late in the morning. freezing spray late in the evening.
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 10 to 15 knots. freezing spray. waves 10 to 14 feet
subsiding to 6 to 9 feet in the late evening and early morning.
waves occasionally around 18 feet. 
.monday...southwest winds 10 to 15 knots becoming south 15 to
20 knots early in the evening...then increasing to 20 to 25 knots
in the late evening and early morning. a chance of snow in the
late evening and early morning. waves 4 to 6 feet building to
8 to 12 feet until early morning. waves occasionally around
15 feet. 


$$

fzus63 kdtx 181443
glflh 
expires:202512182300;;802060

open lake forecast for lake huron
national weather service detroit/pontiac mi
943 am est thu dec 18 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 toward lake
superior today and draws a cold front across the southern great
lakes this evening. southerly winds increase today ahead of the
front before shifting to the northwest friday behind the front.
gale force gusts are expected today and friday, with snow squalls
possible on friday.


lhz363-462>464-182300-
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-
943 am est thu dec 18 2025

...gale warning in effect through friday evening...

.rest of today...south winds to 30 knots with gusts to 40 knot
gales. scattered showers late in the morning...then showers in
the afternoon. waves 10 to 14 feet. waves occasionally around
18 feet. 
.tonight...south winds to 30 knots with gusts to 40 knot gales
decreasing to 20 to 25 knots with gusts to 40 knot gales late in
the evening...then veering to the southwest with gusts to around
30 knots after midnight. showers in the evening...then numerous
showers and scattered snow showers after midnight. waves 10 to
14 feet subsiding to 8 to 12 feet early in the morning. waves
occasionally around 18 feet. 
.friday...west winds to 30 knots increasing to 35 knot gales in
the late morning and afternoon. gusts to 40 knot gales. scattered
snow showers in the morning. freezing spray in the afternoon.
waves 12 to 16 feet. waves occasionally around 20 feet. a gale
warning may be needed. 
.friday night...west winds 20 to 25 knots with gusts to 35 knot
gales decreasing to 15 to 20 knots in the late evening and early
morning...then backing to the southwest after midnight. waves
12 to 16 feet subsiding to 4 to 6 feet. waves occasionally around
20 feet. 
.saturday...south winds 20 to 25 knots becoming west to 30 knots
late in the evening. a chance of snow late in the morning. waves
8 to 12 feet. waves occasionally around 15 feet. 
.sunday...west winds to 30 knots becoming northwest 15 to
20 knots. waves 8 to 12 feet. waves occasionally around 15 feet. 
.monday...southwest winds 15 to 20 knots backing to the south
early in the evening...then increasing to 20 to 25 knots in the
late evening and early morning. waves 5 to 7 feet building to
8 to 12 feet in the late evening and early morning. waves
occasionally around 15 feet. 


$$

fzus63 kmkx 181506
glflm 
expires:202512182215;;803090

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
906 am cst thu dec 18 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...

no major changes to the going forecast with this issuance.

low pressure around 29.0 inches over northern minnesota will 
track into lake superior by this afternoon. southerly gales are
expected to continue this morning, and may briefly intensify
(closer to 40 kt) later this morning through around noon cst. a 
brief lull in the gales is possible this afternoon as low 
pressure crosses the upper peninsula of michigan, but then winds 
become westerly and increase back to gale force behind a strong 
cold front this evening, then turn northwesterly tonight and 
remain gales through friday morning. a gale warning is in effect 
for all open waters for these time frames. moderate freezing spray
is expected to accompany the gales late tonight into friday 
morning as a bitterly cold airmass enters the region. 

winds diminish briefly friday as low pressure exits to the west,
but another low pressure system will swing through southern canada
friday night, bringing potential for south-southwest gales once
again. winds will shift to become northwesterly behind the
trailing cold front of this low saturday afternoon, increasing to
near gales once again saturday night before diminishing again into
sunday. winds remain light through sunday night.


lmz261-362-364-366-563-565-567-868-182215-
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-
906 am cst thu dec 18 2025

sheboygan wi to pentwater mi north...

...gale warning in effect through friday morning...

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

$$

fzus63 kmkx 181506
glflm 
expires:202512182215;;803091

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
906 am cst thu dec 18 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...

no major changes to the going forecast with this issuance.

low pressure around 29.0 inches over northern minnesota will 
track into lake superior by this afternoon. southerly gales are
expected to continue this morning, and may briefly intensify
(closer to 40 kt) later this morning through around noon cst. a 
brief lull in the gales is possible this afternoon as low 
pressure crosses the upper peninsula of michigan, but then winds 
become westerly and increase back to gale force behind a strong 
cold front this evening, then turn northwesterly tonight and 
remain gales through friday morning. a gale warning is in effect 
for all open waters for these time frames. moderate freezing spray
is expected to accompany the gales late tonight into friday 
morning as a bitterly cold airmass enters the region. 

winds diminish briefly friday as low pressure exits to the west,
but another low pressure system will swing through southern canada
friday night, bringing potential for south-southwest gales once
again. winds will shift to become northwesterly behind the
trailing cold front of this low saturday afternoon, increasing to
near gales once again saturday night before diminishing again into
sunday. winds remain light through sunday night.


lmz080-669-671-673-675-777-779-870-872-874-876-878-182215-
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-
906 am cst thu dec 18 2025

sheboygan wi to pentwater mi south...

...gale warning in effect through friday morning...

.rest of today...south gales to 40 kt becoming southwest gales to
35 kt. chance of rain late this morning, then rain and rain
showers this afternoon. waves 10 to 14 ft occasionally to 18 ft. 
.tonight...west gales to 35 kt becoming northwest gales to 40 kt.
chance of snow and rain showers in the evening, then chance of
snow showers 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 becoming west 10 to 20 kt.
chance of snow showers in the morning. freezing spray. waves
12 to 16 ft occasionally to 21 ft subsiding to 6 to 9 ft
occasionally to 12 ft. 
.friday night...south winds 15 to 25 kt increasing to 30 kt.
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
showers in the morning. waves 8 to 11 ft occasionally to 14 ft
subsiding to 6 to 9 ft occasionally to 12 ft. 
.saturday night...west winds to 30 kt becoming northwest.
freezing spray. waves 7 to 10 ft occasionally to 13 ft. 
.sunday...northwest winds to 30 kt diminishing to 10 to 20 kt.
freezing spray. waves 6 to 9 ft occasionally to 12 ft subsiding
to 4 to 7 ft occasionally to 9 ft. 
.monday...south winds to 30 kt. waves 6 to 9 ft occasionally to
12 ft building to 8 to 11 ft occasionally to 14 ft.  

$$

fzus63 kmqt 181501
glfls 
expires:202512182100;;802593

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz162-182100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am est thu dec 18 2025 /900 am cst thu dec 18 2025/

...gale warning in effect from 4 pm est /3 pm cst/ this afternoon
through late tonight...
...heavy freezing spray warning in effect from 7 pm est /6 pm
cst/ this evening through friday morning...

.rest of today...south winds 15 to 25 knots becoming southwest
20 to 30 knots by late morning, then becoming north gales to
45 knots by mid afternoon. rain showers likely and a chance of
drizzle. snow showers in the afternoon. freezing spray in the
afternoon. waves 3 to 5 feet occasionally to 7 feet building to
6 to 9 feet occasionally to 11 feet. 
.tonight...north gales to 45 knots. heavy freezing spray. snow
showers in the evening. a slight chance of snow showers after
midnight. waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet. 
.friday...north winds 15 to 25 knots diminishing to 5 to 15 knots
by late morning, then becoming south 10 to 20 knots by mid
afternoon. a chance of snow showers. waves subsiding to calm to
2 feet. 
.friday night...south winds 20 to 30 knots veering southwest
after midnight. snow showers likely in the evening, then a chance
of snow showers after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. a slight chance of snow showers in the
morning. freezing spray in the afternoon. waves building to 5 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 backing southwest. 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 181501
glfls 
expires:202512182100;;802594

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz263-182100-
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 18 2025

...storm warning in effect from 4 pm est this afternoon through
friday morning...
...heavy freezing spray warning in effect from 7 pm est this
evening through friday morning...

.rest of today...south winds 10 to 20 knots becoming southwest
15 to 25 knots by late morning, then becoming north storm force
winds to 50 knots by mid afternoon. a chance of drizzle late in
the morning. rain showers. snow showers in the afternoon. waves
3 to 5 feet occasionally to 7 feet building to 7 to 10 feet
occasionally to 13 feet. 
.tonight...north storm force winds to 55 knots diminishing to
gales to 45 knots late. heavy freezing spray. snow showers 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. 
.friday...north winds 20 to 30 knots diminishing to 10 to
20 knots by late morning, then becoming southeast 5 to 15 knots
by mid 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. a chance of snow
showers. waves building to 4 to 7 feet occasionally to 9 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 10 to 14 feet
occasionally to 18 feet, then subsiding to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...west gales to 40 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 15 to 25 knots becoming west 5 to
15 knots. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots veering southwest. waves
subsiding to calm to 2 feet, then building to 2 to 4 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 181501
glfls 
expires:202512182100;;802595

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz264-182100-
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 18 2025

...storm warning in effect from 4 pm est this afternoon through
late tonight...
...heavy freezing spray warning in effect from 7 pm est this
evening through friday morning...

.rest of today...south winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then becoming north gales to 45 knots
by mid afternoon. a chance of drizzle late in the morning. rain
showers. snow showers in the afternoon. waves 6 to 9 feet
occasionally to 11 feet subsiding to 4 to 7 feet occasionally to
9 feet, then building to 7 to 10 feet occasionally to 13 feet. 
.tonight...north storm force winds to 55 knots. heavy freezing
spray. snow showers. waves building to 12 to 17 feet occasionally
to 21 feet. 
.friday...north gales to 40 knots diminishing to 5 to 15 knots.
heavy freezing spray in the morning. a chance of snow showers.
waves subsiding to 2 to 4 feet. 
.friday night...southeast winds 20 to 30 knots veering south
after midnight. 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...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 10 to 14 feet
occasionally to 18 feet. 
.saturday night...northwest gales to 40 knots. heavy freezing
spray. waves subsiding to 6 to 9 feet occasionally to 11 feet. 
.sunday...northwest winds 20 to 30 knots becoming west 10 to
20 knots. freezing spray. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots increasing to 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet. 

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 181501
glfls 
expires:202512182100;;802596

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz265-182100-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am est thu dec 18 2025

...gale warning in effect through friday morning...
...heavy freezing spray warning in effect from 10 pm est this
evening through friday morning...

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

note, wave height forecasts are for ice free areas.

$$

fzus63 kmqt 181501
glfls 
expires:202512182100;;802597

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz266-182100-
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 18 2025

...gale warning in effect until 10 pm est this evening...
...storm warning in effect from 10 pm est this evening through
late tonight...
...heavy freezing spray warning in effect from 10 pm est this
evening through friday morning...

.rest of today...south gales to 35 knots diminishing to 20 to
30 knots. a chance of drizzle and rain showers late in the
morning, then rain showers in the afternoon. waves 7 to 10 feet
occasionally to 13 feet subsiding to 3 to 5 feet occasionally to
7 feet, then building to 3 to 6 feet occasionally to 8 feet. 
.tonight...west gales to 45 knots becoming north storm force
winds to 50 knots by midnight. heavy freezing spray. rain showers
likely and a slight chance of drizzle in the evening. snow
showers. waves building to 15 to 20 feet occasionally to 25 feet.
.friday...north gales to 45 knots diminishing to 10 to 20 knots
by mid afternoon. heavy freezing spray. snow showers likely in
the morning. a chance of snow showers in the afternoon. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.friday night...south winds 20 to 30 knots increasing to 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 7 to
10 feet occasionally to 13 feet. 
.saturday...southwest 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. freezing spray 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 2 to 4 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 181501
glfls 
expires:202512182100;;802598

open lake forecast for lake superior
national weather service marquette mi
1000 am est thu dec 18 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...

a 29.0 inch clipper over northern minnesota this morning moves into 
lake superior this afternoon. this low lifts northeast away from the 
lake tonight before reaching northern quebec friday morning. a 29.9 
inch ridge then returns to the lake on friday via a 30.2 inch high 
over the lower mississippi valley and a weakening 29.9 inch high 
over northern ontario. another low pressure of around 29.3 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 ohio river valley late this weekend, building to 30.7 inches by 
monday morning.



lsz267-182100-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am est thu dec 18 2025

...gale warning in effect through friday morning...
...heavy freezing spray warning in effect from 10 pm est this
evening through friday morning...

.rest of today...south gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. a chance of drizzle and rain showers
late in the morning, then rain showers in the afternoon. waves
5 to 8 feet occasionally to 10 feet subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tonight...west winds 20 to 30 knots becoming northwest gales to
35 knots by midnight, then becoming north gales to 45 knots late.
drizzle and 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 10 to 14 feet
occasionally to 18 feet. 
.friday...north gales to 45 knots diminishing to 15 to 25 knots
by mid afternoon. freezing spray. snow showers likely in the
morning. a chance of snow showers in the afternoon. waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet. 
.friday night...south winds 15 to 25 knots increasing to 20 to
30 knots after midnight. a chance of snow showers in the evening,
then snow showers likely after midnight. waves subsiding to 2 to
4 feet, then building to 5 to 8 feet occasionally to 10 feet. 
.saturday...south winds 20 to 30 knots becoming west gales to
35 knots in the afternoon. snow showers. waves building to 10 to
14 feet occasionally to 18 feet. 
.saturday night...west gales to 40 knots veering northwest after
midnight. 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. 
.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. 
.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.

$$