fzus61 kbuf 200811
glflo 
expires:202604201500;;681628

open lake forecast for lake ontario
national weather service buffalo ny
411 am edt mon apr 20 2026

for waters beyond five nautical miles of shore on lake ontario

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 30.4 inch high will settle southeast across the great 
lakes through tonight, before sliding off the mid-atlantic coast 
tuesday. a 29.4 inch low over lower hudson bay tuesday, will weaken 
to 29.9 inches by wednesday, while pushing an attendant weak cold 
front across the lake tuesday night. a 30.2 inch high will then 
build across the great lakes region wednesday and thursday. a warm 
front will then approach the lake by friday. a 29.6 inch low may 
move southwest of the lake on saturday.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
411 am edt mon apr 20 2026

.today...northwest winds 15 to 20 knots becoming west. waves 3 to
5 feet subsiding to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...southwest winds 5 to 15 knots becoming southeast.
waves 1 to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots. waves 2 feet or
less. 
.wednesday...northeast winds 10 knots or less becoming north.
waves 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots becoming east. a chance
of showers friday night. waves 1 to 3 feet. 

$$

fzus61 kbuf 200811
glflo 
expires:202604201500;;681627

open lake forecast for lake ontario
national weather service buffalo ny
411 am edt mon apr 20 2026

for waters beyond five nautical miles of shore on lake ontario

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 30.4 inch high will settle southeast across the great 
lakes through tonight, before sliding off the mid-atlantic coast 
tuesday. a 29.4 inch low over lower hudson bay tuesday, will weaken 
to 29.9 inches by wednesday, while pushing an attendant weak cold 
front across the lake tuesday night. a 30.2 inch high will then 
build across the great lakes region wednesday and thursday. a warm 
front will then approach the lake by friday. a 29.6 inch low may 
move southwest of the lake on saturday.


loz062-201500-
lake ontario open waters from the niagara river to hamlin beach-
411 am edt mon apr 20 2026

.today...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots becoming south 10 knots or
less. waves 1 to 3 feet subsiding to 1 foot or less. 
.tuesday...south winds 10 to 15 knots becoming southeast. waves
1 to 2 feet. 
.tuesday night...southeast winds 5 to 10 knots becoming
northeast. waves 2 feet or less. 
.wednesday...northeast winds less than 10 knots becoming north.
waves 1 foot or less. 
.thursday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet building to
2 to 4 feet. 

$$

fzus61 kcle 200748
glfle 
expires:202604201430;;680253

open lake forecast for lake erie
national weather service cleveland oh
348 am edt mon apr 20 2026

for waters beyond five nautical miles of shore on lake erie

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...
high pressure 30.40 inches will remain over the lake today and
push east tonight. a warm front will cross the lake on tuesday. a
cold front will cross the lake on wednesday. high pressure 30.10
inches enters from the north for wednesday night and thursday. a
cold front will approach from the west for friday.


lez162>164-201430-
detroit river lt. to maumee bay oh to reno beach oh beyond 5nm
offshoreline to us-canadian border-
reno beach to the islands oh beyond 5nm off shoreline to us-
canadian border-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
348 am edt mon apr 20 2026

.today...north winds 10 knots or less. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming south and
increasing to 15 to 20 knots after midnight. waves 2 feet or
less. 
.tuesday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 1 to 3 feet. 
.tuesday night...southwest winds 5 to 15 knots becoming west. a
chance of showers. waves 2 feet or less. 
.wednesday...northwest winds 10 knots or less becoming east.
waves 1 foot or less. 
.thursday...southeast winds 5 to 15 knots becoming south. waves
2 feet or less. 
.friday...south winds 10 to 15 knots becoming southwest. a chance
of showers during the day, then showers likely friday night.
waves 1 to 2 feet. 

$$

fzus61 kcle 200748
glfle 
expires:202604201430;;680254

open lake forecast for lake erie
national weather service cleveland oh
348 am edt mon apr 20 2026

for waters beyond five nautical miles of shore on lake erie

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...
high pressure 30.40 inches will remain over the lake today and
push east tonight. a warm front will cross the lake on tuesday. a
cold front will cross the lake on wednesday. high pressure 30.10
inches enters from the north for wednesday night and thursday. a
cold front will approach from the west for friday.


lez061-165>169-201430-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
348 am edt mon apr 20 2026

.today...northwest winds 5 to 15 knots becoming west. waves 1 to
3 feet. 
.tonight...southwest winds 5 to 15 knots becoming south. waves
2 feet or less. 
.tuesday...south winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday night...southwest winds 5 to 10 knots becoming west. a
chance of showers. waves 2 feet or less. 
.wednesday...northwest winds 10 knots or less becoming east.
waves 2 feet or less. 
.thursday...southeast winds 10 knots or less increasing to 10 to
15 knots. waves 2 feet or less. 
.friday...southeast winds 5 to 15 knots becoming northeast. a
chance of showers during the day, then showers likely friday
night. waves 2 feet or less. 

$$

fzus63 kdtx 201225
glflh 
expires:202604202030;;690306

open lake forecast for lake huron
national weather service detroit/pontiac mi
825 am edt mon apr 20 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...high pressure moves through the region today, then 
gusty south wind develops tuesday ahead of the next cold front set
to pass through tuesday night. another area of high pressure 
settles into the region on wednesday.


lhz361>363-202030-
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-
825 am edt mon apr 20 2026

.rest of today...west winds 5 to 10 knots. waves 3 to 5 feet
subsiding to 1 to 3 feet late in the afternoon. 
.tonight...southeast winds 10 to 15 knots becoming south 15 to
20 knots in the late evening and overnight. waves 1 to 3 feet
building to 5 to 7 feet. waves occasionally around 10 feet. 
.tuesday...south winds 15 to 20 knots decreasing to 10 to
15 knots in the late morning and early afternoon...then veering
to the south 10 to 15 knots early in the afternoon. waves 6 to
9 feet. waves occasionally around 12 feet. 
.tuesday night...northeast 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 becoming light and
variable...then becoming east 5 to 10 knots late in the evening.
waves 2 feet or less. 
.thursday...southeast winds 5 to 10 knots becoming east 15 to
20 knots. waves 2 to 4 feet building to 5 to 7 feet . waves
occasionally around 10 feet. 
.friday...east winds 15 to 20 knots decreasing to 10 to 15 knots
early in the evening...then increasing to 15 to 20 knots by
midnight. a chance of showers . waves 6 to 9 feet. waves
occasionally around 12 feet. 


$$

fzus63 kdtx 201225
glfsc 
expires:202604202030;;690314

lake st clair forecast
national weather service detroit/pontiac mi
825 am edt mon apr 20 2026

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...high pressure moves across the region today, then 
gusty south wind develops tuesday ahead of the next cold front set
to pass through tuesday night. another area of high pressure 
settles into the region on wednesday.


lcz460-202030-
lake st clair-
825 am edt mon apr 20 2026

.rest of today...northwest winds 5 to 10 knots in the late morning
and early afternoon becoming light and variable. sunny. waves 2 feet
or less.
.tonight...south winds 5 to 10 knots increasing to 10 to 15 knots in
the late evening and overnight. mostly clear. waves 2 feet or less.
.tuesday...south winds 15 to 20 knots. partly sunny. a chance of
sprinkles until late afternoon. waves 1 to 3 feet.
.tuesday night...southwest winds 10 to 15 knots becoming northwest 5
to 10 knots in the late evening and overnight. partly cloudy. waves
2 feet or less.
.wednesday...north winds 5 to 10 knots in the morning becoming light
and variable...then becoming northeast 5 to 10 knots in the evening.
mostly sunny in the morning becoming clear. waves 2 feet or less.
.thursday...southeast winds 10 to 15 knots. mostly clear. waves 2
feet or less.
.friday...southeast winds 10 to 15 knots. partly cloudy. light
showers likely. waves 1 to 3 feet.

$$

fzus63 kdtx 201225
glflh 
expires:202604202030;;690307

open lake forecast for lake huron
national weather service detroit/pontiac mi
825 am edt mon apr 20 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...high pressure moves through the region today, then 
gusty south wind develops tuesday ahead of the next cold front set
to pass through tuesday night. another area of high pressure 
settles into the region on wednesday.


lhz462>464-202030-
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-
825 am edt mon apr 20 2026

.rest of today...northwest winds 10 to 15 knots decreasing to
5 to 10 knots early in the afternoon...then veering to the
northwest 5 to 10 knots late in the afternoon. waves 3 to 5 feet
subsiding to 2 to 4 feet late in the afternoon. 
.tonight...southeast winds 5 to 10 knots becoming south 15 to
20 knots. waves 1 to 3 feet building to 3 to 5 feet after
midnight. 
.tuesday...south winds 15 to 20 knots decreasing to 10 to
15 knots early in the afternoon. sprinkles in the morning. waves
5 to 7 feet. waves occasionally around 10 feet. 
.tuesday night...south winds 5 to 10 knots backing to the north
in the late evening and overnight. waves 2 to 4 feet subsiding to
1 to 3 feet in the late evening and overnight. 
.wednesday...north winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.thursday...southeast winds 5 to 10 knots increasing to 10 to
15 knots . waves 1 to 3 feet building to 2 to 4 feet by midnight.
.friday...southeast winds 15 to 20 knots decreasing to 10 to
15 knots . a chance of showers . waves 3 to 5 feet. 


$$

fzus63 kmkx 201252
glflm 
expires:202604202115;;691102

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
752 am cdt mon apr 20 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 of 30.4 inches shifting over lower michigan today 
and low pressure around 29.7 inches developing in the plains will
bring increasing southerly winds to lake michigan through tuesday
morning.a few gales are possible tonight into early tuesday 
morning, especially over the northern third of the lake as low 
pressure around 29.5 inches also progresses across the hudson 
bay. a cold front from this low will progress southward through 
the lake tuesday afternoon and evening, shifting winds to 
northeasterly. high pressure around 30.4 inches builds into 
ontario on wednesday, bringing light and variable winds. winds 
will then become southeast and increase thursday into friday as 
strong low pressure around 29.2 inches develops in the northern 
plains.


lmz080-669-671-673-675-777-779-870-872-874-876-878-202115-
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-
752 am cdt mon apr 20 2026

sheboygan wi to pentwater mi south...

.rest of today...southeast winds 5 to 10 kt becoming south 10 to 
20 kt early this afternoon, then becoming southeast 15 to 25 kt 
late. waves 1 to 3 ft building to 3 to 5 ft. 
.tonight...southeast winds 15 to 25 kt becoming south. waves 4 to
6 ft occasionally to 8 ft. 
.tuesday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft. 
.tuesday night...south winds 5 to 10 kt backing to north. waves
2 to 4 ft subsiding to 1 to 2 ft. 
.wednesday...northeast winds 5 to 10 kt becoming north. waves
1 to 2 ft. 
.wednesday night...east winds 10 to 15 kt becoming south 10 to
20 kt. waves 1 ft or less building to 1 to 3 ft. 
.thursday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft building to 4 to 7 ft occasionally to 9 ft. 
.friday...south winds to 30 kt becoming southwest 10 to 20 kt.
showers likely. waves 6 to 9 ft occasionally to 12 ft.  

$$

fzus63 kmkx 201252
glflm 
expires:202604202115;;691101

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
752 am cdt mon apr 20 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 of 30.4 inches shifting over lower michigan today 
and low pressure around 29.7 inches developing in the plains will
bring increasing southerly winds to lake michigan through tuesday
morning.a few gales are possible tonight into early tuesday 
morning, especially over the northern third of the lake as low 
pressure around 29.5 inches also progresses across the hudson 
bay. a cold front from this low will progress southward through 
the lake tuesday afternoon and evening, shifting winds to 
northeasterly. high pressure around 30.4 inches builds into 
ontario on wednesday, bringing light and variable winds. winds 
will then become southeast and increase thursday into friday as 
strong low pressure around 29.2 inches develops in the northern 
plains.


lmz261-362-364-366-563-565-567-868-202115-
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-
752 am cdt mon apr 20 2026

sheboygan wi to pentwater mi north...

.rest of today...southwest winds 5 to 10 kt increasing to 10 to 
to 20 kt early this afternoon and becoming south 15 to 25 kt 
late. waves 1 to 3 ft building to 3 to 5 ft. 
.tonight...south winds to 30 kt. waves 5 to 8 ft occasionally to
10 ft. 
.tuesday...southwest winds to 30 kt diminishing to 10 to 15 kt.
waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft. 
.tuesday night...northeast winds 10 to 15 kt. waves 2 to 4 ft
subsiding to 1 to 3 ft. 
.wednesday...northeast winds 5 to 10 kt. waves 1 to 2 ft. 
.wednesday night...southeast winds 5 to 10 kt increasing to 10 to
20 kt. waves 1 ft or less building to 1 to 3 ft. 
.thursday...south winds 15 to 25 kt. waves 3 to 5 ft building to
4 to 7 ft occasionally to 9 ft. 
.friday...southeast winds to 30 kt becoming south 15 to 25 kt.
chance of rain showers. waves 7 to 10 ft occasionally to 13 ft.  

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680578

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz267-202000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt mon apr 20 2026

...gale watch in effect from this evening through late tonight...

.early this morning...northwest winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.today...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing southeast late. 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 after midnight, then becoming southwest 20 to 30 knots
late. waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots veering north
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. waves building to 1 to 3 feet. 
.thursday...southeast winds 20 to 30 knots increasing to 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, then building to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680576

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz265-202000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt mon apr 20 2026

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

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680575

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz264-202000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt mon apr 20 2026

.early this morning...west winds less than 10 knots. waves calm
to 2 feet. 
.today...southwest winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon, then backing south late. waves
building to 2 to 4 feet. 
.tonight...south winds 15 to 25 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. waves building
to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 5 to 15 knots backing west late. waves
subsiding to calm to 2 feet. 
.tuesday night...west winds less than 10 knots backing southeast
after midnight. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots. 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 gales to 35 knots. rain showers likely.
waves building to 9 to 12 feet occasionally to 15 feet. 
.friday...south gales to 35 knots becoming west 15 to 25 knots. a
chance of rain showers. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680574

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz263-202000-
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 mon apr 20 2026

.early this morning...north winds 5 to 15 knots. waves calm to
2 feet. 
.today...southwest winds 5 to 15 knots becoming south 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.tonight...southwest winds 15 to 25 knots becoming west 10 to
20 knots late. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest late.
waves subsiding to calm to 2 feet. 
.tuesday night...south winds less than 10 knots backing southeast
after midnight. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots becoming east
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. waves building to 2 to 4 feet. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots. rain showers likely. waves building to 8 to 11 feet
occasionally to 14 feet. 
.friday...west winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680573

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt mon apr 20 2026 /300 am cdt mon apr 20 2026/

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

$$

fzus63 kmqt 200801
glfls 
expires:202604202000;;680577

open lake forecast for lake superior
national weather service marquette mi
400 am edt mon apr 20 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...

high pressure ridging of 30.3 inches remains over lake superior 
through this morning. a 29.1 inch low moving from northern manitoba 
to hudson bay on today swings a 29.8 inch trough across lake 
superior tonight into tuesday morning. 30.0 inch high pressure 
ridging returns over the lake by tuesday afternoon as the low 
weakens over hudson bay. a 29.2 inch low then develops over the 
northern rockies on wednesday and tracks into central manitoba at 
around 29.5 inches on friday. this sends 29.5 inch troughing over 
lake superior thursday night into friday.



lsz266-202000-
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 mon apr 20 2026

...gale watch in effect from this evening through late tonight...

.early this morning...northwest winds 5 to 15 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.today...southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming south 15 to 25 knots
late. waves subsiding to calm to 2 feet, then building to 2 to
4 feet. 
.tonight...south winds 20 to 30 knots increasing to gales to
35 knots after midnight, then becoming southwest 15 to 25 knots
late. waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots veering north
after midnight. waves subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves building to 1 to 3 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 gales to 40 knots. a chance of rain
showers. waves building to 9 to 12 feet occasionally to 15 feet. 
.friday...southeast gales to 35 knots becoming west 15 to
25 knots. a chance of rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 

$$