fzus63 kdtx 210714
glflh 
expires:202604211515;;732877

open lake forecast for lake huron
national weather service detroit/pontiac mi
314 am edt tue apr 21 2026

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 weak low pressure system will pass through southeast
michigan this afternoon and evening. there is a chance of showers
and storms across the south and is followed by an area of high
pressure at 30.00 inches on wednesday. a warm front slowly lifts
into the area late thursday into friday as the parent low
pressure stalls over the upper midwest.


lhz361>363-211515-
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-
314 am edt tue apr 21 2026

.today...south winds 15 to 20 knots decreasing to 10 to 15 knots
in the afternoon. waves 6 to 9 feet. waves occasionally around
12 feet. 
.tonight...north winds 5 to 10 knots. waves 3 to 5 feet subsiding
to 1 to 3 feet after midnight. 
.wednesday...north winds 5 to 10 knots until late afternoon
becoming light and variable. waves 2 feet or less. 
.wednesday night...light and variable winds. waves 2 feet or
less. 
.thursday...east winds 5 to 10 knots increasing to 10 to
15 knots. waves 1 to 3 feet building to 5 to 7 feet. waves
occasionally around 10 feet. 
.friday...east winds 15 to 20 knots. showers likely . waves 5 to
7 feet. waves occasionally around 10 feet. 
.saturday...northeast winds 15 to 20 knots becoming north 10 to
15 knots. a chance of showers until afternoon. waves 3 to 5 feet.


$$

fzus63 kdtx 210714
glflh 
expires:202604211515;;732878

open lake forecast for lake huron
national weather service detroit/pontiac mi
314 am edt tue apr 21 2026

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 weak low pressure system will pass through southeast
michigan this afternoon and evening. there is a chance of showers
and storms across the south and is followed by an area of high
pressure at 30.00 inches on wednesday. a warm front slowly lifts
into the area late thursday into friday as the parent low
pressure stalls over the upper midwest.


lhz462>464-211515-
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-
314 am edt tue apr 21 2026

.today...south winds 20 to 25 knots decreasing to 10 to 15 knots.
sprinkles. waves 5 to 7 feet. waves occasionally around 10 feet. 
.tonight...south winds 5 to 10 knots. waves 2 to 4 feet subsiding
to 1 to 3 feet in the late evening and overnight. 
.wednesday...north winds 5 to 10 knots. waves 2 feet or less. 
.wednesday night...north winds 5 to 10 knots early in the evening
becoming light and variable. waves 2 feet or less. 
.thursday...southeast winds 5 to 10 knots becoming east 10 to
15 knots late in the afternoon. waves 1 to 3 feet. 
.friday...southeast winds 10 to 15 knots. showers likely . waves
2 to 4 feet. 
.saturday...east winds 10 to 15 knots backing to the northeast in
the late morning and early afternoon...then becoming north 5 to
10 knots . showers likely early in the morning...then a chance of
showers in the late morning and early afternoon. waves 2 to
4 feet. 


$$

fzus63 kmkx 210804
glflm 
expires:202604211530;;734621

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
304 am cdt tue apr 21 2026

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...

high pressure around 30.4 inches over the mid atlantic and
northeastern conus and low pressure around 29.7 inches developing
in the plains will bring breezy southerly winds to lake michigan 
through this morning. meanwhile, 29.5 inch low pressure tracks 
eastward across the hudson bay with a cold front extending south 
of it. 

the aforementioned cold front will progress southward down the 
lake this afternoon and evening, with light northeasterly winds 
behind it. high pressure around 30.4 inches builds into ontario on
wednesday, bringing light and variable winds across the lake. 
winds will then become southeast and increase thursday into 
friday, as strong low pressure around 29.2 inches develops in the 
northern plains.


lmz261-362-364-366-563-565-567-868-211530-
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-
304 am cdt tue apr 21 2026

sheboygan wi to pentwater mi north...

.today...south winds to 30 kt becoming southwest 10 to 15 kt.
waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. 
.tonight...north winds 5 to 10 kt increasing to 10 to 15 kt.
waves 2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northeast winds 5 to 10 kt becoming east. waves 1 to
2 ft. 
.wednesday night...east winds 5 to 10 kt becoming southeast 10 to
15 kt. waves 1 ft or less building to 1 to 2 ft. 
.thursday...southeast winds 10 to 20 kt. waves 2 to 4 ft building
to 4 to 6 ft occasionally to 8 ft. 
.thursday night...southeast winds 15 to 25 kt increasing to
30 kt. chance of rain showers. waves 4 to 7 ft occasionally to
9 ft. 
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
rain showers likely. waves 4 to 7 ft occasionally to 9 ft. 
.saturday...north winds 10 to 20 kt becoming northeast. waves
3 to 5 ft.  

$$

fzus63 kmkx 210804
glflm 
expires:202604211530;;734622

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
304 am cdt tue apr 21 2026

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...

high pressure around 30.4 inches over the mid atlantic and
northeastern conus and low pressure around 29.7 inches developing
in the plains will bring breezy southerly winds to lake michigan 
through this morning. meanwhile, 29.5 inch low pressure tracks 
eastward across the hudson bay with a cold front extending south 
of it. 

the aforementioned cold front will progress southward down the 
lake this afternoon and evening, with light northeasterly winds 
behind it. high pressure around 30.4 inches builds into ontario on
wednesday, bringing light and variable winds across the lake. 
winds will then become southeast and increase thursday into 
friday, as strong low pressure around 29.2 inches develops in the 
northern plains.


lmz080-669-671-673-675-777-779-870-872-874-876-878-211530-
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-
304 am cdt tue apr 21 2026

sheboygan wi to pentwater mi south...

.today...south winds to 30 kt diminishing to 10 to 20 kt.
scattered rain showers this afternoon. waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft. 
.tonight...south winds 10 to 15 kt backing to north. patchy fog
overnight. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northeast winds 5 to 10 kt. patchy fog. waves 1 to
2 ft. 
.wednesday night...southeast winds 5 to 10 kt becoming south
10 to 15 kt. waves 1 ft or less building to 1 to 3 ft. 
.thursday...south winds 10 to 20 kt. waves 2 to 4 ft building to
4 to 6 ft occasionally to 8 ft. 
.thursday night...south winds 15 to 25 kt. chance of showers.
waves 4 to 7 ft occasionally to 9 ft. 
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
rain showers likely. waves 4 to 7 ft occasionally to 9 ft. 
.saturday...north winds 10 to 20 kt. waves 3 to 5 ft.  

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734384

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt tue apr 21 2026 /300 am cdt tue apr 21 2026/

.early this morning...west winds 5 to 15 knots. waves 1 to 3 feet
subsiding to calm to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet. 
.tonight...southeast winds less than 10 knots backing east after
midnight, then increasing to 5 to 15 knots late. waves calm to
2 feet. 
.wednesday...east winds 5 to 15 knots becoming northeast 10 to
20 knots late. waves calm to 2 feet. 
.wednesday night...northeast winds 10 to 20 knots veering east
after midnight. a slight chance of thunderstorms through
midnight. a slight chance of rain showers. waves building to 2 to
4 feet. 
.thursday...east winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a chance of rain showers by mid
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. rain showers and a chance of
thunderstorms. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday...north winds 15 to 25 knots becoming northwest 10 to
20 knots. a chance of rain showers. waves subsiding to 1 to
3 feet. 
.saturday...west winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734385

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz263-212000-
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 edt tue apr 21 2026

.early this morning...west winds 10 to 20 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.today...northwest winds 5 to 15 knots becoming west less than
10 knots in the afternoon, then backing southwest late. waves
subsiding to calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots becoming east
5 to 15 knots in the afternoon. waves calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots. a slight chance of
rain showers. waves building to 3 to 5 feet occasionally to
7 feet. 
.thursday...east winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday night...southeast winds 20 to 30 knots. rain showers
and a chance of thunderstorms. waves building to 7 to 10 feet
occasionally to 13 feet. 
.friday...southeast winds 20 to 30 knots becoming west 10 to
20 knots. rain showers likely. waves subsiding to 2 to 4 feet. 
.saturday...west winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734386

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz264-212000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt tue apr 21 2026

.early this morning...west winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.today...northwest winds 5 to 15 knots becoming west less than
10 knots late. waves subsiding to calm to 2 feet. 
.tonight...southwest winds less than 10 knots backing southeast
late. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon. waves calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. a slight chance of rain showers
after midnight. waves building to 3 to 5 feet occasionally to
7 feet. 
.thursday...southeast winds 20 to 30 knots backing east by mid
afternoon. waves building to 6 to 9 feet occasionally to 11 feet.
.thursday night...southeast gales to 35 knots. a chance of rain
showers through midnight. rain showers likely after midnight.
waves building to 7 to 10 feet occasionally to 13 feet. 
.friday...southeast gales to 35 knots becoming northwest 10 to
20 knots. rain showers likely, then a chance of rain showers.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...southwest winds 10 to 20 knots becoming southeast
5 to 15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734387

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz265-212000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt tue apr 21 2026

.early this morning...southwest winds 15 to 25 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.today...west winds 10 to 20 knots veering north in the
afternoon, then diminishing to 5 to 15 knots late. waves
subsiding to calm to 2 feet. 
.tonight...south winds 5 to 15 knots veering west after midnight,
then backing south late. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming east 15 to 25 knots
late. waves calm to 2 feet. 
.wednesday night...southeast winds 15 to 25 knots. waves building
to 2 to 4 feet. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday night...southeast gales to 35 knots. a chance of rain
showers. waves building to 6 to 9 feet occasionally to 11 feet. 
.friday...southeast gales to 35 knots becoming west 15 to
25 knots. rain showers likely, then a chance of rain showers.
waves subsiding to 2 to 4 feet. 
.saturday...west winds 10 to 20 knots backing southwest. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734388

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz266-212000-
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 edt tue apr 21 2026

.early this morning...southwest winds 20 to 30 knots. waves 5 to
8 feet occasionally to 10 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.today...west winds 10 to 20 knots veering northwest in the
afternoon, then diminishing to 5 to 15 knots late. waves
subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering north late.
waves calm to 2 feet. 
.wednesday...south winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. waves calm to
2 feet. 
.wednesday night...southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.thursday night...southeast gales to 40 knots. a chance of rain
showers. waves building to 7 to 10 feet occasionally to 13 feet. 
.friday...southeast gales to 40 knots becoming northwest 15 to
25 knots. rain showers likely, then a chance of rain showers.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...northwest winds 10 to 20 knots backing southwest.
waves subsiding to calm to 2 feet, then building to 2 to 4 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202604212000;;734389

open lake forecast for lake superior
national weather service marquette mi
400 am edt tue apr 21 2026

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 29.8 inch trough continues across lake superior this morning. 
behind it, 30.0 inch high pressure ridging returns over the lake by 
this evening. a 29.2 inch low then develops over the northern 
rockies on wednesday and tracks into manitoba by no later than 
thursday evening. this sends 29.6 to 29.7 inch troughing over lake 
superior thursday night into friday. 30.1 inch ridging slowly 
returns to lake superior on saturday.



lsz267-212000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt tue apr 21 2026

.early this morning...southwest winds 20 to 30 knots. waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.today...southwest winds 10 to 20 knots veering northwest late.
waves subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering north late.
waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.thursday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.thursday night...southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.friday...southeast gales to 35 knots diminishing to 15 to
25 knots. a chance of rain showers. waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.saturday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 

$$