fzus61 kbuf 210203
glflo 
expires:202604210900;;720298

open lake forecast for lake ontario
national weather service buffalo ny
1003 pm 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 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 a 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 approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz063>065-210900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1003 pm edt mon apr 20 2026

.overnight...west winds 5 to 15 knots becoming southwest.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southeast. waves
1 to 2 feet. 
.tuesday night...southeast winds 10 to 15 knots. waves 1 to
3 feet. 
.wednesday...east winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.wednesday night...west winds less than 10 knots becoming north.
waves 1 foot or less. 
.thursday...north 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. 
.saturday...east winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 

$$

fzus61 kbuf 210203
glflo 
expires:202604210900;;720297

open lake forecast for lake ontario
national weather service buffalo ny
1003 pm 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 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 a 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 approach the 
lake by friday. a 29.6 inch low may move southwest of the lake on 
saturday.


loz062-210900-
lake ontario open waters from the niagara river to hamlin beach-
1003 pm edt mon apr 20 2026

.overnight...southwest winds 10 knots or less becoming
south. waves 2 feet or less. 
.tuesday...south winds 10 to 15 knots. waves 1 to 2 feet. 
.tuesday night...southeast winds 5 to 10 knots becoming
northeast. waves 2 feet or less. 
.wednesday...northeast winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.wednesday night...west 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. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. a chance of showers. waves 2 to 4 feet. 

$$

fzus61 kcle 210133
glfle 
expires:202604210815;;719677

open lake forecast for lake erie
national weather service cleveland oh
933 pm 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 push east tonight as a warm front
approaches from the west. the front will lift east across the lake
during the day on tuesday. a cold front will then sink south
across lake erie on tuesday night into wednesday. high pressure
30.10 inches briefly enters from the north on wednesday night. low
pressure 29.30 inches will push east across the upper midwest
before lifting another warm front across the lake on friday.


lez061-165>169-210815-
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-
933 pm edt mon apr 20 2026

.overnight...south winds 5 to 15 knots. 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 1 to 3 feet. 
.wednesday...northwest winds 10 knots or less becoming west.
waves 2 feet or less. 
.wednesday night...southwest winds less than 10 knots becoming
east. waves 1 foot or less. 
.thursday...east winds 10 knots or less becoming southeast. waves
2 feet or less. 
.friday...southeast winds 5 to 15 knots. a chance of showers
friday night. waves 1 to 3 feet. 
.saturday...north winds 5 to 15 knots becoming northeast. a
chance of showers. waves 1 to 3 feet. 

$$

fzus61 kcle 210133
glfle 
expires:202604210815;;719676

open lake forecast for lake erie
national weather service cleveland oh
933 pm 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 push east tonight as a warm front
approaches from the west. the front will lift east across the lake
during the day on tuesday. a cold front will then sink south
across lake erie on tuesday night into wednesday. high pressure
30.10 inches briefly enters from the north on wednesday night. low
pressure 29.30 inches will push east across the upper midwest
before lifting another warm front across the lake on friday.


lez162>164-210815-
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-
933 pm edt mon apr 20 2026

.overnight...southeast winds 5 to 15 knots becoming south
15 to 20 knots. 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 10 to 15 knots becoming west. a
chance of showers. waves 1 to 2 feet. 
.wednesday...northwest winds 10 knots or less becoming east.
waves 1 foot or less. 
.wednesday night...east winds 10 knots or less. 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 west. a chance of
showers during the day, then showers likely friday night. waves
1 to 2 feet. 
.saturday...northwest winds 10 to 15 knots becoming northeast. a
chance of showers during the day. waves 1 to 3 feet. 

$$

fzus63 kdtx 210227
glfsc 
expires:202604211030;;721186

lake st clair forecast
national weather service detroit/pontiac mi
1027 pm 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...gusty south wind precedes a weak disturbance that
passes through the region tonight. this system brings a chance of
showers and storms across the south and is followed by a weak
area of high pressure on wednesday. a warm front then slowly
lifts into the area late thursday into friday as the parent low
pressure stalls over the upper midwest.


lcz460-211030-
lake st clair-
1027 pm edt mon apr 20 2026

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

$$

fzus63 kdtx 210226
glflh 
expires:202604211030;;721165

open lake forecast for lake huron
national weather service detroit/pontiac mi
1026 pm 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...gusty south wind precedes a weak disturbance that
passes through the region tonight. this system brings a chance of
showers and storms across the south and is followed by a weak
area of high pressure on wednesday. a warm front then slowly
lifts into the area late thursday into friday as the parent low
pressure stalls over the upper midwest.


lhz462>464-211030-
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-
1026 pm edt mon apr 20 2026

.rest of tonight...south winds 10 to 15 knots increasing to 15 to
20 knots with gusts to around 30 knots after midnight. waves 2 to
4 feet building to 3 to 5 feet after midnight. 
.tuesday...south winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots. a chance of showers in the
morning. waves 5 to 7 feet. waves occasionally around 10 feet. 
.tuesday night...southeast winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 2 feet or less 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 increasing to 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 north in the
late morning and early afternoon...then decreasing to 5 to
10 knots . a chance of showers until afternoon. waves 2 to
4 feet. 


$$

fzus63 kdtx 210226
glflh 
expires:202604211030;;721164

open lake forecast for lake huron
national weather service detroit/pontiac mi
1026 pm 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...gusty south wind precedes a weak disturbance that
passes through the region tonight. this system brings a chance of
showers and storms across the south and is followed by a weak
area of high pressure on wednesday. a warm front then slowly
lifts into the area late thursday into friday as the parent low
pressure stalls over the upper midwest.


lhz361>363-211030-
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-
1026 pm edt mon apr 20 2026

.rest of tonight...south winds 15 to 20 knots. gusts to 30 knots
early in the morning. waves 5 to 7 feet. waves occasionally
around 10 feet. 
.tuesday...south winds 15 to 20 knots with gusts to around
30 knots decreasing to 10 to 15 knots early in the afternoon...
then backing to the southeast late in the afternoon. waves 6 to
9 feet. waves occasionally around 12 feet. 
.tuesday night...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 becoming southeast
5 to 10 knots after midnight. waves 2 feet or less. 
.thursday...southeast winds 5 to 10 knots becoming east 15 to
20 knots. waves 1 to 3 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 in the late morning and early
afternoon. rain 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 early in the morning. waves 3 to
5 feet. 


$$

fzus63 kmkx 210144
glflm 
expires:202604210915;;719893

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
844 pm 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 around 30.4 inches over lower michigan 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.

then a cold front from this low will progress southward down the 
lake tuesday afternoon and evening, with 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.


lmz261-362-364-366-563-565-567-868-210915-
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-
844 pm cdt mon apr 20 2026

sheboygan wi to pentwater mi north...

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

$$

fzus63 kmkx 210144
glflm 
expires:202604210915;;719894

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
844 pm 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 around 30.4 inches over lower michigan 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.

then a cold front from this low will progress southward down the 
lake tuesday afternoon and evening, with 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.


lmz080-669-671-673-675-777-779-870-872-874-876-878-210915-
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-
844 pm cdt mon apr 20 2026

sheboygan wi to pentwater mi south...

.rest of tonight...southeast winds 15 to 25 kt becoming south.
waves 4 to 6 ft occasionally to 8 ft. 
.tuesday...south winds to 30 kt diminishing to 10 to 20 kt.
chance of rain showers in the afternoon. waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft. 
.tuesday night...north winds 10 to 15 kt diminishing to 5 to
10 kt. 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 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 increasing to 15 to 25 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 5 to 8 ft occasionally to 10 ft. 
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
showers likely. waves 5 to 8 ft occasionally to 10 ft subsiding
to 4 to 7 ft occasionally to 9 ft. 
.saturday...north winds 10 to 20 kt. waves 4 to 6 ft occasionally
to 8 ft.  

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720131

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz265-210800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 pm edt mon apr 20 2026

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

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720132

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz266-210800-
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 pm edt mon apr 20 2026

...gale warning in effect until 4 am edt tuesday...

.rest of tonight...south gales to 35 knots becoming southwest
20 to 30 knots late. waves 5 to 9 feet occasionally to 11 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots veering north
late. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. 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 40 knots. a chance of rain
showers. waves building to 8 to 11 feet occasionally to 14 feet. 
.friday...southeast gales to 35 knots becoming west 15 to
25 knots. rain showers likely. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to 1 to 3 feet, then building to 2 to
4 feet. 

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720133

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz267-210800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 pm edt mon apr 20 2026

...gale warning in effect until 4 am edt tuesday...

.rest of tonight...south gales to 35 knots becoming southwest
20 to 30 knots late. waves 4 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...southwest winds 10 to 20 knots veering northwest in
the afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots veering north
late. 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 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. a chance of rain showers. waves
building to 5 to 8 feet occasionally to 10 feet. 
.friday...southeast winds 20 to 30 knots diminishing to 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 6 feet
occasionally to 8 feet. 
.saturday...west winds 10 to 20 knots. waves subsiding to 1 to
3 feet, then building to 2 to 4 feet. 

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720129

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz263-210800-
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 pm edt mon apr 20 2026

.rest of tonight...southwest winds 15 to 25 knots becoming west
10 to 20 knots late. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then becoming southwest 5 to 15 knots
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. a slight chance of rain showers
after midnight. waves building to 2 to 4 feet. 
.thursday...southeast winds 10 to 20 knots becoming east 15 to
25 knots by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet. 
.thursday night...southeast winds 20 to 30 knots. rain showers
likely and a chance of thunderstorms. waves building to 7 to
10 feet occasionally to 13 feet. 
.friday...west winds 20 to 30 knots diminishing to 15 to
25 knots. a chance of rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.saturday...west winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720128

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz162-210800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt mon apr 20 2026 /900 pm cdt mon apr 20 2026/

.rest of tonight...southwest winds 10 to 20 knots becoming west
5 to 15 knots late. waves 1 to 3 feet subsiding to calm to
2 feet. 
.tuesday...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet. 
.tuesday night...south winds 5 to 15 knots backing northeast
after midnight, then veering east late. 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 slight chance of rain showers. waves building
to 1 to 3 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 2 to 4 feet. 
.thursday night...east winds 10 to 20 knots. rain showers and a
chance of thunderstorms. waves building to 4 to 7 feet
occasionally to 9 feet. 
.friday...west winds 10 to 20 knots. waves subsiding to 2 to
4 feet. 
.saturday...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 

$$

fzus63 kmqt 210201
glfls 
expires:202604210800;;720130

open lake forecast for lake superior
national weather service marquette mi
1000 pm 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...

a 29.1 inch low moving from northern manitoba to hudson bay 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 
manitoba at around 29.5 inches on friday. this sends 29.6 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz264-210800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 pm edt mon apr 20 2026

.rest of tonight...south winds 15 to 25 knots veering southwest
after midnight, then becoming west 10 to 20 knots late. waves
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet. 
.tuesday...northwest winds 5 to 15 knots backing west late. waves
subsiding to calm to 2 feet. 
.tuesday night...southwest winds less than 10 knots backing
southeast late. 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. a slight
chance of rain showers after midnight. waves building to 2 to
4 feet. 
.thursday...southeast 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 gales to 35 knots. a chance of rain
showers through midnight. a chance of thunderstorms. rain showers
likely after midnight. waves building to 8 to 11 feet
occasionally to 14 feet. 
.friday...southeast winds 20 to 30 knots becoming west 10 to
20 knots. a chance of rain showers. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.saturday...west winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to 2 to 4 feet. 

$$