fzus61 kbuf 212003
glflo 
expires:202604220300;;762098

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt tue apr 21 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 weak 29.4 inch low will cross the area tonight, and in 
the process drag an attendant cold front across the lake. a 30.1 
inch high will then build across the great lakes region wednesday 
and thursday. a warm front will approach the lake by friday. a 29.7 
inch low will move southwest of the lake on saturday, followed by a 
30.2 inch high building across the lake saturday night and sunday.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt tue apr 21 2026

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

$$

fzus61 kbuf 212003
glflo 
expires:202604220300;;762097

open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt tue apr 21 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 weak 29.4 inch low will cross the area tonight, and in 
the process drag an attendant cold front across the lake. a 30.1 
inch high will then build across the great lakes region wednesday 
and thursday. a warm front will approach the lake by friday. a 29.7 
inch low will move southwest of the lake on saturday, followed by a 
30.2 inch high building across the lake saturday night and sunday.


loz062-220300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt tue apr 21 2026

.tonight...east winds 15 to 20 knots becoming south and
diminishing to 10 knots or less after midnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.wednesday...northeast winds less than 10 knots becoming
southwest. waves 1 foot or less. 
.wednesday night...west winds 10 knots or less becoming
northwest. waves 1 foot or less. 
.thursday...northwest winds less than 10 knots becoming
southwest. waves 1 foot or less. 
.thursday night...southwest winds 10 knots or less becoming
northeast 10 to 15 knots. waves 2 feet or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain showers friday night. waves 1 to 3 feet building
to 3 to 6 feet. 
.saturday...east winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of showers. waves 4 to 7 feet subsiding to
3 to 6 feet. waves occasionally around 9 feet. 
.sunday...east winds 5 to 15 knots. waves 1 to 3 feet. 

$$

fzus61 kcle 211938
glfle 
expires:202604220215;;761299

open lake forecast for lake erie
national weather service cleveland oh
338 pm edt tue apr 21 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...
a cold front will push south across lake erie tonight into wednesday 
morning before high pressure 30.10 inches builds overhead from the 
north through thursday. low pressure 29.70 inches will move east 
across the upper great lakes on thursday and will lift a warm front 
across the lake thursday into friday. the low will then extend a 
cold front east across the lower great lakes friday into saturday. 


lez165>168-220215-
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-
338 pm edt tue apr 21 2026

.tonight...south winds 5 to 15 knots becoming west. a slight
chance of showers and thunderstorms early, then a chance of
showers with a slight chance of thunderstorms. a slight chance of
showers late. waves 1 to 3 feet. 
.wednesday...west winds 5 to 10 knots. waves 2 feet or less. 
.wednesday night...southwest winds less than 10 knots becoming
northeast. waves 1 foot or less. 
.thursday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.thursday night...east winds 5 to 10 knots. waves 1 foot or less.
.friday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. a chance of showers during the day, then showers likely
friday night. waves 1 to 3 feet. 
.saturday...northeast winds 10 to 15 knots. a chance of showers
during the day. waves 1 to 2 feet. 
.sunday...northeast winds 5 to 15 knots becoming east. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211938
glfle 
expires:202604220215;;761300

open lake forecast for lake erie
national weather service cleveland oh
338 pm edt tue apr 21 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...
a cold front will push south across lake erie tonight into wednesday 
morning before high pressure 30.10 inches builds overhead from the 
north through thursday. low pressure 29.70 inches will move east 
across the upper great lakes on thursday and will lift a warm front 
across the lake thursday into friday. the low will then extend a 
cold front east across the lower great lakes friday into saturday. 


lez061-169-220215-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
338 pm edt tue apr 21 2026

.tonight...south winds 5 to 10 knots becoming southwest. a chance
of showers through the early overnight, then a slight chance of
showers late. waves 2 feet or less. 
.wednesday...west winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.wednesday night...southwest winds 5 to 10 knots becoming light
and variable. waves 1 foot or less. 
.thursday...light and variable winds. waves 1 foot or less. 
.thursday night...east winds less than 10 knots becoming
northeast. waves 1 foot or less. 
.friday...northeast winds 5 to 10 knots. showers likely friday
night. waves 2 feet or less. 
.saturday...northeast winds 5 to 10 knots. a chance of showers
during the day. waves 2 feet or less. 
.sunday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211938
glfle 
expires:202604220215;;761298

open lake forecast for lake erie
national weather service cleveland oh
338 pm edt tue apr 21 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...
a cold front will push south across lake erie tonight into wednesday 
morning before high pressure 30.10 inches builds overhead from the 
north through thursday. low pressure 29.70 inches will move east 
across the upper great lakes on thursday and will lift a warm front 
across the lake thursday into friday. the low will then extend a 
cold front east across the lower great lakes friday into saturday. 


lez162>164-220215-
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-
338 pm edt tue apr 21 2026

.tonight...southwest winds 5 to 15 knots becoming west. a slight
chance of showers and thunderstorms early, then showers likely
with a slight chance of thunderstorms late this evening. a chance
of showers with a slight chance of thunderstorms after midnight.
waves 2 feet or less. 
.wednesday...northwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.wednesday night...southeast winds less than 10 knots becoming
east. waves 1 foot or less. 
.thursday...east winds 10 knots or less. waves 1 foot or less. 
.thursday night...east winds 5 to 10 knots becoming southeast.
waves 1 foot 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. 
.saturday...north winds 10 to 15 knots becoming northeast. waves
1 to 2 feet. 
.sunday...northeast winds 10 to 15 knots becoming east. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 211936
glfsc 
expires:202604220400;;761288

lake st clair forecast
national weather service detroit/pontiac mi
336 pm edt tue apr 21 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...a weak low pressure system and cold front will pass
through the great lakes this afternoon and evening, bringing a
chance of showers and storms across the south. an area of high
pressure follows wednesday. a warm front then slowly lifts into
the area late thursday into friday as the parent low pressure
stalls over the northern plains.


lcz460-220400-
lake st clair-
336 pm edt tue apr 21 2026

.tonight...southwest winds 10 to 15 knots diminishing to 5 to 10
knots by midnight...then veering to the northwest early in the
morning. mostly cloudy with a chance of light showers in the
evening...then partly cloudy after midnight. waves 2 feet or less.
.wednesday...north winds 5 to 10 knots in the morning becoming light
and variable...then becoming east 5 to 10 knots late in the
afternoon. 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...light and variable winds becoming southeast 5 to 10
knots in the late morning and afternoon. mostly sunny. waves 2 feet
or less.
.thursday night...southeast winds 5 to 10 knots. mostly clear. waves
2 feet or less.
.friday...east winds 10 to 15 knots. partly sunny in the
morning...then a chance of light showers in the afternoon. mostly
cloudy with light showers likely in the evening. waves 2 feet or
less.
.saturday...north winds 10 to 15 knots. mostly cloudy with light
showers likely. waves 2 feet or less.
.sunday...northeast winds 10 to 15 knots. partly cloudy. waves 2
feet or less.

$$

fzus63 kdtx 211936
glflh 
expires:202604220400;;761258

open lake forecast for lake huron
national weather service detroit/pontiac mi
336 pm 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 and cold front will pass
through the great lakes this afternoon and evening, bringing a
chance of showers and storms across the south. an area of high
pressure follows wednesday. a warm front then slowly lifts into
the area late thursday into friday as the parent low pressure
stalls over the northern plains.


lhz361>363-220400-
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-
336 pm edt tue apr 21 2026

.tonight...east winds 5 to 10 knots veering to the west after
midnight...then veering to the northwest early in the morning.
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
in the late morning and afternoon. waves 1 to 3 feet building to
3 to 5 feet in the late morning and afternoon. 
.thursday night...east winds 10 to 15 knots. waves 4 to 6 feet. 
.friday...east winds 15 to 20 knots. a chance of showers late in
the morning. showers likely late in the evening. waves 6 to
9 feet. waves occasionally around 12 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 10 to
15 knots. a chance of showers early in the morning. waves 4 to
6 feet subsiding to 2 to 4 feet by midnight. waves occasionally
around 8 feet. 
.sunday...north winds 10 to 15 knots decreasing to 5 to 10 knots
until early evening...then veering to the northeast by midnight.
waves 2 to 4 feet subsiding to 1 to 3 feet. 


$$

fzus63 kdtx 211936
glflh 
expires:202604220400;;761259

open lake forecast for lake huron
national weather service detroit/pontiac mi
336 pm 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 and cold front will pass
through the great lakes this afternoon and evening, bringing a
chance of showers and storms across the south. an area of high
pressure follows wednesday. a warm front then slowly lifts into
the area late thursday into friday as the parent low pressure
stalls over the northern plains.


lhz462>464-220400-
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-
336 pm edt tue apr 21 2026

.tonight...south winds 5 to 10 knots veering to the southwest
after midnight...then veering to the northwest early in the
morning. 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...east winds 5 to 10 knots. waves 2 feet or less. 
.thursday night...east winds 5 to 10 knots increasing to 10 to
15 knots after midnight. waves 1 to 3 feet. 
.friday...east winds 10 to 15 knots. a chance of showers late in
the morning. showers likely late in the afternoon. waves 1 to
3 feet building to 3 to 5 feet late in the afternoon. 
.saturday...east winds 10 to 15 knots becoming northeast 5 to
10 knots. showers likely early in the morning...then a chance of
showers in the late morning and early afternoon. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.sunday...north winds 10 to 15 knots decreasing to 5 to 10 knots.
waves 1 to 3 feet. 


$$

fzus63 kmkx 211930
glflm 
expires:202604220315;;761153

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
230 pm 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...

light to modest south winds will shift to light north to 
northeasterly tonight, as a weak cold front passes and high 
pressure moves across ontario and the northern great lakes.
scattered strong thunderstorms will affect far southern lake
michigan this afternoon. 

the high over the northern great lakes will then shift to the
lower great lakes on wednesday. light northeast to east winds on
wednesday will then become southeast wednesday night and increase
thursday into friday, as strong low pressure around 29.2 inches 
develops in the northern plains.


lmz080-669-671-673-675-777-779-870-872-874-876-878-220315-
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-
230 pm cdt tue apr 21 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 10 to 15 kt backing to north. patchy fog.
waves 2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northeast winds 5 to 10 kt. patchy fog in the
morning. waves 1 to 2 ft. 
.wednesday night...east winds 5 to 10 kt veering to south 10 to
15 kt. waves 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. waves 4 to 7 ft
occasionally to 9 ft. 
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 4 to 7 ft occasionally to 9 ft. 
.friday night...northwest winds 10 to 20 kt becoming north.
chance of rain showers. waves 3 to 5 ft. 
.saturday...north winds 10 to 20 kt. waves 3 to 5 ft. 
.sunday...northeast winds 10 to 20 kt diminishing to 10 to 15 kt.
waves 3 to 5 ft.  

$$

fzus63 kmkx 211930
glflm 
expires:202604220315;;761152

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
230 pm 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...

light to modest south winds will shift to light north to 
northeasterly tonight, as a weak cold front passes and high 
pressure moves across ontario and the northern great lakes.
scattered strong thunderstorms will affect far southern lake
michigan this afternoon. 

the high over the northern great lakes will then shift to the
lower great lakes on wednesday. light northeast to east winds on
wednesday will then become southeast wednesday night and increase
thursday into friday, as strong low pressure around 29.2 inches 
develops in the northern plains.


lmz261-362-364-366-563-565-567-868-220315-
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-
230 pm cdt tue apr 21 2026

sheboygan wi to pentwater mi north...

.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 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. waves 4 to 7 ft occasionally to 9 ft. 
.friday...south winds 15 to 25 kt diminishing to 10 to 20 kt.
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 4 to 7 ft occasionally to 9 ft. 
.friday night...north winds 10 to 20 kt. chance of rain showers.
waves 3 to 5 ft. 
.saturday...north winds 10 to 20 kt becoming northeast. waves
3 to 5 ft. 
.sunday...northeast winds 10 to 20 kt diminishing to 10 to 15 kt.
waves 1 to 3 ft.  

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761933

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt tue apr 21 2026 /300 pm cdt tue apr 21 2026/

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

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761934

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz263-220800-
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 pm edt tue apr 21 2026

.late this afternoon...south winds less than 10 knots. waves calm
to 2 feet. 
.tonight...southwest winds less than 10 knots backing east after
midnight, then veering southeast late. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing east late. waves
calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots. a chance of rain
showers and a slight chance of thunderstorms after midnight.
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 6 to 9 feet
occasionally to 11 feet. 
.thursday night...east winds 20 to 30 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...east winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. rain showers likely through early afternoon. a
chance of rain showers by mid afternoon. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.friday night...north winds 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 becoming east 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots becoming east 10 to
20 knots. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761935

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz264-220800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt tue apr 21 2026

.late this afternoon...west winds less than 10 knots. waves calm
to 2 feet. 
.tonight...west 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, then backing east late. waves
calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots increasing to 15 to
25 knots late. a slight chance of rain showers after midnight.
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 6 to 9 feet
occasionally to 11 feet. 
.thursday night...east winds 20 to 30 knots becoming southeast
gales to 35 knots after midnight. a chance of rain showers. waves
building to 8 to 11 feet occasionally to 14 feet. 
.friday...southeast gales to 35 knots becoming east 20 to
30 knots by mid afternoon. rain showers likely. waves subsiding
to 5 to 8 feet occasionally to 10 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of rain showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...north winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...east winds 5 to 15 knots increasing to 10 to 20 knots.
waves building to 1 to 3 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761936

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz265-220800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt tue apr 21 2026

.late this afternoon...north winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...northwest winds 5 to 15 knots backing southeast late.
waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. waves calm to
2 feet. 
.wednesday night...southeast winds 15 to 25 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. waves 5 to 8 feet occasionally to 10 feet. 
.friday...southeast gales to 35 knots becoming east 20 to
30 knots by mid afternoon. rain showers likely. waves subsiding
to 3 to 6 feet occasionally to 8 feet. 
.friday night...southeast winds 15 to 25 knots. a chance of rain
showers. waves 3 to 6 feet occasionally to 8 feet. 
.saturday...west winds 10 to 20 knots backing east. waves
subsiding to calm to 2 feet. 
.sunday...east winds 10 to 20 knots. waves building to 2 to
4 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761937

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz266-220800-
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 pm edt tue apr 21 2026

.late this afternoon...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering east late. waves
calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east late.
waves calm to 2 feet. 
.wednesday night...southeast winds 10 to 20 knots increasing to
15 to 25 knots late. waves building to 2 to 4 feet. 
.thursday...east winds 20 to 30 knots. a slight chance of rain
showers through early 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 7 to 10 feet occasionally to 13 feet. 
.friday...southeast gales to 35 knots becoming east 20 to
30 knots by mid afternoon. a chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. waves
subsiding to 4 to 7 feet occasionally to 9 feet. 
.friday night...east winds 15 to 25 knots. a chance of rain
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...north winds 15 to 25 knots becoming northwest 10 to
20 knots. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots becoming east 10 to
20 knots. waves building to 2 to 4 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761938

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

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. 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.



lsz267-220800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt tue apr 21 2026

.late this afternoon...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering northeast late.
waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots backing east in the
afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southeast late. waves
building to 1 to 3 feet. 
.thursday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a slight chance of rain showers
through early 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 20 to
30 knots by mid afternoon. a chance of rain showers. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots. rain showers likely
through midnight, then a chance of rain showers after midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...east winds 10 to 20 knots becoming northwest 5 to
15 knots. a chance of rain showers. waves subsiding to calm to
2 feet. 
.sunday...north winds 5 to 15 knots veering east. waves building
to 1 to 3 feet. 

$$