fzus61 kbuf 171402
glflo 
expires:202605172100;;712484

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun may 17 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 29.4 inch low over the upper mississippi valley today 
will weaken to 29.7 inches as it moves northeast into the upper 
great lakes tonight while swinging an attendant warm front across 
the lake. another area of low pressure will develop over the central 
plains monday. the low will weaken from 29.4 inches to 29.6 inches 
as it tracks northeast to the upper great lakes monday night into 
tuesday morning, then to central quebec wednesday while 
strengthening to 29.4 inches. a cold front attendant to this low 
will cross the lake late tuesday night into wednesday morning. a 
large 30.4 inch high will then build across the entire great lakes 
region wednesday night through thursday.


loz063>065-172100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sun may 17 2026

.this afternoon...west winds 10 knots or less becoming south.
patchy fog. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming east. a
chance of showers late. waves 1 foot or less. 
.monday...southeast winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.monday night...south winds 5 to 10 knots becoming southwest.
waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. showers likely with a chance of thunderstorms tuesday
night. waves 1 to 3 feet building to 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 3 to 6 feet. 
.thursday...north winds 5 to 15 knots diminishing to less than
10 knots. waves 2 to 4 feet subsiding to 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 171402
glflo 
expires:202605172100;;712483

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sun may 17 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 29.4 inch low over the upper mississippi valley today 
will weaken to 29.7 inches as it moves northeast into the upper 
great lakes tonight while swinging an attendant warm front across 
the lake. another area of low pressure will develop over the central 
plains monday. the low will weaken from 29.4 inches to 29.6 inches 
as it tracks northeast to the upper great lakes monday night into 
tuesday morning, then to central quebec wednesday while 
strengthening to 29.4 inches. a cold front attendant to this low 
will cross the lake late tuesday night into wednesday morning. a 
large 30.4 inch high will then build across the entire great lakes 
region wednesday night through thursday.


loz062-172100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sun may 17 2026

.this afternoon...west winds 10 knots or less becoming east.
patchy fog. waves 1 foot or less. 
.tonight...southeast winds 5 to 10 knots becoming east. a chance
of showers from late evening on. waves 1 foot or less. 
.monday...east winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots in the afternoon. waves 1 to 3 feet.
.monday night...southwest winds 10 to 15 knots. a chance of
showers overnight. waves 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots. a chance of showers
during the day, then showers with a chance of thunderstorms
tuesday night. waves 2 to 4 feet building to 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. showers likely during the day. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.thursday...north winds 10 knots or less becoming northeast.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 171308
glfle 
expires:202605172015;;710953

open lake forecast for lake erie
national weather service cleveland oh
908 am edt sun may 17 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 frontal boundary will waver to the north of lake erie today. 
the boundary will lift north as a warm front late today into 
monday. low pressure of 29.60 inches will move northeast through 
the upper great lakes on tuesday with a cold front settling south
across lake erie on wednesday morning. high pressure of 30.20 
inches will build over lake erie on thursday.


lez162>166-172015-
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-
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-
908 am edt sun may 17 2026

.this afternoon...southwest winds 10 knots or less becoming
southeast. a slight chance of showers and thunderstorms.
waves 2 feet or less. 
.tonight...southeast winds 5 to 15 knots becoming south. a slight
chance of showers and thunderstorms early. waves 2 feet or less. 
.monday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. waves 1 to 3 feet. 
.monday night...southwest winds 15 to 20 knots becoming south
10 to 15 knots. a chance of showers and thunderstorms in the
evening, then a chance of showers overnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming southwest. a
chance of showers and thunderstorms during the day, then showers
with thunderstorms likely tuesday night. waves 1 to 3 feet
building to 2 to 4 feet. 
.wednesday...northwest winds 5 to 15 knots becoming northeast
15 to 20 knots. waves 1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 171308
glfle 
expires:202605172015;;710954

open lake forecast for lake erie
national weather service cleveland oh
908 am edt sun may 17 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 frontal boundary will waver to the north of lake erie today. 
the boundary will lift north as a warm front late today into 
monday. low pressure of 29.60 inches will move northeast through 
the upper great lakes on tuesday with a cold front settling south
across lake erie on wednesday morning. high pressure of 30.20 
inches will build over lake erie on thursday.


lez061-167>169-172015-
ripley to buffalo ny extending from 5nm 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-
908 am edt sun may 17 2026

.this afternoon...southwest winds 10 knots or less becoming south.
a slight chance of showers and thunderstorms late. waves 2 feet
or less. 
.tonight...southeast winds 5 to 10 knots becoming south. waves
2 feet or less. 
.monday...south winds 10 to 15 knots becoming southwest. waves
2 feet or less. 
.monday night...southwest winds 10 to 15 knots. a chance of
showers overnight. waves 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers during the day, then showers with
thunderstorms likely tuesday night. waves 1 to 3 feet building to
2 to 4 feet. 
.wednesday...west winds 5 to 15 knots becoming north. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming east. waves
1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 171342
glfsc 
expires:202605172145;;711945

lake st clair forecast
national weather service detroit/pontiac mi
942 am edt sun may 17 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 cold front stalls over southern lake huron this
morning. isolated strong to severe thunderstorms are possible
near the frontal zones this afternoon and may linger through late
tonight. the front lifts north as a warm front overnight,
resulting in a period of breezy southerly flow and thunderstorm
chances through the first half of the work week.


lcz460-172145-
lake st clair-
942 am edt sun may 17 2026

.rest of today...light and variable winds becoming southeast 5 to 10
knots in the afternoon. partly sunny. waves 2 feet or less.
.tonight...south winds 10 to 15 knots. partly cloudy. waves 2 feet
or less.
.monday...south winds 10 to 15 knots increasing to 20 to 25 knots.
mostly sunny. waves 1 to 3 feet building to 2 to 4 feet early in the
afternoon.
.monday night...southwest winds 15 to 20 knots diminishing to 10 to
15 knots after midnight. partly cloudy. a chance of light showers in
the late evening and overnight. waves 2 to 4 feet subsiding to 1 to
3 feet in the late evening and overnight.
.tuesday...south winds 15 to 20 knots becoming southwest 20 to 25
knots with gusts to 30 knots in the afternoon and evening. partly
sunny in the morning...then light showers and a chance of
thunderstorms in the afternoon and evening. waves 1 to 3 feet
building to 2 to 4 feet in the afternoon and evening. a small craft
advisory may be needed.
.wednesday...northeast winds 15 to 20 knots. partly cloudy. light
showers. waves 1 to 3 feet.
.thursday...northeast winds 10 to 15 knots. mostly clear. waves 2
feet or less.

$$

fzus63 kdtx 171340
glflh 
expires:202605172145;;711927

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am edt sun may 17 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 cold front stalls over southern lake huron this
morning. isolated strong to severe thunderstorms are possible
near the frontal zones this afternoon and may linger through late
tonight. the front lifts north as a warm front overnight,
resulting in a period of breezy southerly flow and thunderstorm
chances through the first half of the work week.


lhz362-363-172145-
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-
940 am edt sun may 17 2026

.rest of today...north winds 5 to 10 knots becoming northeast
10 to 15 knots late in the afternoon. waves 1 to 3 feet. 
.tonight...east winds 10 to 15 knots. a chance of showers. waves
1 to 3 feet building to 2 to 4 feet in the late evening and
overnight. 
.monday...southeast winds 15 to 20 knots. a chance of showers in
the afternoon. waves 5 to 7 feet. waves occasionally around
10 feet. 
.monday night...south winds 15 to 20 knots decreasing to 10 to
15 knots in the late evening and overnight. showers in the
evening...then showers likely and a chance of thunderstorms after
midnight. waves 5 to 7 feet. waves occasionally around 10 feet. 
.tuesday...south winds 15 to 20 knots increasing to 20 to
25 knots late in the morning...then becoming west 15 to 20 knots
late in the evening. a chance of showers. waves 5 to 7 feet
building to 8 to 12 feet late in the evening. waves occasionally
around 15 feet. 
.wednesday...northwest winds 15 to 20 knots decreasing to 10 to
15 knots by midnight. waves 6 to 9 feet. waves occasionally
around 12 feet. 
.thursday...north winds 5 to 10 knots veering to the northeast by
midnight. waves 3 to 5 feet subsiding to 2 feet or less . 


$$

fzus63 kdtx 171340
glflh 
expires:202605172145;;711928

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am edt sun may 17 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 cold front stalls over southern lake huron this
morning. isolated strong to severe thunderstorms are possible
near the frontal zones this afternoon and may linger through late
tonight. the front lifts north as a warm front overnight,
resulting in a period of breezy southerly flow and thunderstorm
chances through the first half of the work week.


lhz462>464-172145-
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-
940 am edt sun may 17 2026

.rest of today...north winds 5 to 10 knots. waves 2 feet or less.
.tonight...north winds 5 to 10 knots becoming southeast 10 to
15 knots after midnight. a chance of showers in the evening.
waves 1 to 3 feet building to 2 to 4 feet early in the morning. 
.monday...south winds 15 to 20 knots. a chance of showers in the
afternoon. waves 3 to 5 feet. 
.monday night...south winds 15 to 20 knots decreasing to 10 to
15 knots in the late evening and overnight. showers and a chance
of thunderstorms in the evening...then showers likely and a
chance of thunderstorms after midnight. waves 3 to 5 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots late in the evening. a chance of showers in the
morning...then showers and a chance of thunderstorms late in the
morning. a chance of showers late in the evening. waves 4 to
6 feet. waves occasionally around 8 feet. 
.wednesday...north winds 10 to 15 knots. waves 4 to 6 feet. waves
occasionally around 8 feet. 
.thursday...north winds 10 to 15 knots decreasing to 5 to
10 knots. waves 3 to 5 feet subsiding to 1 to 3 feet by midnight.


$$

fzus63 kdtx 171340
glflh 
expires:202605172145;;711926

open lake forecast for lake huron
national weather service detroit/pontiac mi
940 am edt sun may 17 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 cold front stalls over southern lake huron this
morning. isolated strong to severe thunderstorms are possible
near the frontal zones this afternoon and may linger through late
tonight. the front lifts north as a warm front overnight,
resulting in a period of breezy southerly flow and thunderstorm
chances through the first half of the work week.


lhz361-172145-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
940 am edt sun may 17 2026

.rest of today...northeast winds 5 to 10 knots becoming east
10 to 15 knots late in the afternoon. a chance of showers in the
afternoon. waves 2 feet or less building to 2 to 4 feet late in
the afternoon. 
.tonight...east winds 10 to 15 knots increasing to 15 to 20 knots
in the late evening and overnight. a chance of showers and
thunderstorms in the evening...then showers likely and a chance
of thunderstorms after midnight. waves 3 to 5 feet. 
.monday...east winds 15 to 20 knots becoming southeast 10 to
15 knots in the late morning and afternoon. a chance of showers
in the afternoon. waves 4 to 6 feet. waves occasionally around
8 feet. 
.monday night...east winds 5 to 10 knots veering to the south in
the late evening and overnight. showers. waves 3 to 5 feet. 
.tuesday...south winds 10 to 15 knots increasing to 15 to
20 knots late in the morning...then becoming west 20 to 25 knots
with gusts to around 30 knots late in the afternoon. showers.
waves 3 to 5 feet building to 6 to 9 feet late in the afternoon.
waves occasionally around 12 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots. waves 5 to 7 feet. waves
occasionally around 10 feet. 
.thursday...north winds 5 to 10 knots early in the morning
becoming light and variable...then becoming east 5 to 10 knots .
waves 2 to 4 feet subsiding to 2 feet or less. 


$$

fzus63 kmkx 171432
glflm 
expires:202605172200;;713744

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
932 am cdt sun may 17 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...

a wind shift to the northeast is expected along with brief gusty 
winds directly behind the front. the front will then gradually 
return north as a warm front mainly sunday night, with winds 
veering southerly and becoming gusty as low pressure of 29.5 
inches approaches from the west. breezy south winds will then 
continue through monday and into tuesday followed by a wind shift 
to the northwest late tuesday afternoon and evening with the 
passage of a cold front. high pressure and light and variable 
winds will then take hold from late wednesday into thursday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-172200-
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-
932 am cdt sun may 17 2026

sheboygan wi to pentwater mi south...

.rest of today...east winds 10 to 20 kt becoming southeast 15 to
25 kt. patchy fog. slight chance of rain showers and
thunderstorms through mid morning, then chance of rain showers
and slight chance of thunderstorms this afternoon. waves 2 to
4 ft. 
.tonight...southeast winds 15 to 25 kt becoming south to 30 kt.
patchy fog in the evening. waves 3 to 5 ft building to 4 to 6 ft
occasionally to 8 ft. 
.monday...south winds to 30 kt. showers likely with a chance of
thunderstorms. waves 5 to 8 ft occasionally to 10 ft. 
.monday night...south winds 15 to 25 kt increasing to 30 kt.
showers likely with a chance of thunderstorms in the evening,
then chance of showers and thunderstorms overnight. waves 4 to
7 ft occasionally to 9 ft building to 5 to 8 ft occasionally to
10 ft. 
.tuesday...south winds to 30 kt becoming southwest. chance of
showers and thunderstorms. waves 7 to 10 ft occasionally to
13 ft. 
.tuesday night...west winds 15 to 25 kt becoming northwest 10 to
20 kt. waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to
6 ft occasionally to 8 ft. 
.wednesday...north winds 10 to 20 kt. waves 3 to 5 ft. 
.thursday...northeast winds 10 to 15 kt becoming north 10 to
20 kt. waves 1 to 3 ft.  

$$

fzus63 kmkx 171432
glflm 
expires:202605172200;;713743

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
932 am cdt sun may 17 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...

a wind shift to the northeast is expected along with brief gusty 
winds directly behind the front. the front will then gradually 
return north as a warm front mainly sunday night, with winds 
veering southerly and becoming gusty as low pressure of 29.5 
inches approaches from the west. breezy south winds will then 
continue through monday and into tuesday followed by a wind shift 
to the northwest late tuesday afternoon and evening with the 
passage of a cold front. high pressure and light and variable 
winds will then take hold from late wednesday into thursday.


lmz261-362-364-366-563-565-567-868-172200-
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-
932 am cdt sun may 17 2026

sheboygan wi to pentwater mi north...

.rest of today...northeast winds 10 to 20 kt increasing to 15 to
25 kt. chance of rain showers through mid morning, then rain
showers likely with slight chance of thunderstorms this
afternoon. patchy fog this afternoon. waves 2 to 4 ft. 
.tonight...east winds 15 to 25 kt veering to south to 30 kt.
patchy fog. rain showers likely with a chance of thunderstorms in
the evening, then chance of rain showers and slight chance of
thunderstorms overnight. waves 3 to 5 ft building to 4 to 6 ft
occasionally to 8 ft. 
.monday...south winds to 30 kt. patchy fog in the morning, then
patchy dense fog in the afternoon. chance of showers in the
morning, then showers likely in the afternoon. waves 5 to 8 ft
occasionally to 10 ft. 
.monday night...south winds to 30 kt. showers likely with a
chance of thunderstorms in the evening, then showers with a
chance of thunderstorms overnight. waves 5 to 8 ft occasionally
to 10 ft. 
.tuesday...south gales to 35 kt becoming southwest. showers with
a chance of thunderstorms in the morning, then chance of
thunderstorms in the afternoon. waves 7 to 10 ft occasionally to
13 ft. 
.tuesday night...northwest winds to 30 kt diminishing to 15 to
25 kt. waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to
5 ft. 
.wednesday...northwest winds 15 to 25 kt becoming north. waves
3 to 5 ft. 
.thursday...east winds 5 to 10 kt becoming north 10 to 20 kt.
waves 1 to 2 ft.  

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712460

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz264-172000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt sun may 17 2026

.rest of today...east winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves calm to 2 feet building to 2 to
4 feet. 
.tonight...east winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then diminishing to 15 to 25 knots late. a chance
of rain showers through midnight. a chance of thunderstorms. rain
showers after midnight. waves building to 4 to 7 feet
occasionally to 9 feet. 
.monday...southeast winds 10 to 20 knots backing north in the
afternoon, then increasing to 15 to 25 knots late. a chance of
rain showers and a slight chance of thunderstorms. waves
subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers
through midnight. a slight chance of thunderstorms. rain showers
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.tuesday...north gales to 35 knots. rain showers through early
afternoon, then a slight chance of rain showers by mid afternoon.
waves subsiding to 5 to 8 feet occasionally to 10 feet. 
.tuesday night...north winds 15 to 25 knots backing northwest
after midnight. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.wednesday...northwest winds 15 to 25 knots becoming southwest
5 to 15 knots. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing south. waves
building to 1 to 3 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712461

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz265-172000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt sun may 17 2026

.rest of today...east winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. a slight chance of rain showers by mid afternoon. waves
calm to 2 feet building to 2 to 4 feet. 
.tonight...east winds 15 to 25 knots becoming southeast 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
rain showers likely and a chance of thunderstorms. waves building
to 4 to 7 feet occasionally to 9 feet. 
.monday...south winds 10 to 20 knots backing north in the
afternoon, then increasing to 15 to 25 knots late. showers and a
chance of thunderstorms. waves subsiding to 1 to 3 feet. 
.monday night...north winds 10 to 20 knots veering northeast
after midnight. a chance of rain showers through midnight. a
chance of thunderstorms. rain showers after midnight. waves
building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. rain showers and a slight chance of
thunderstorms through early afternoon. waves building to 6 to
10 feet occasionally to 13 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves subsiding
to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 15 to 25 knots becoming southwest
5 to 15 knots. waves subsiding to calm to 2 feet. 
.thursday...southeast winds 10 to 20 knots veering south. waves
building to 1 to 3 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712462

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz266-172000-
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-
1001 am edt sun may 17 2026

.rest of today...east winds 10 to 20 knots backing northeast
late. a slight chance of rain showers by mid afternoon. waves
1 to 3 feet building to 2 to 4 feet. 
.tonight...east winds 20 to 30 knots veering southeast after
midnight. a chance of rain showers through midnight. a chance of
thunderstorms. rain showers after midnight. waves building to
5 to 8 feet occasionally to 10 feet. 
.monday...south winds 15 to 25 knots backing north late. a chance
of showers through early afternoon. a chance of thunderstorms.
showers by mid afternoon. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.monday night...north winds 20 to 30 knots veering northeast
after midnight. a chance of rain showers through midnight. a
slight chance of thunderstorms. rain showers after midnight.
waves building to 5 to 8 feet occasionally to 10 feet. 
.tuesday...north gales to 35 knots backing northwest by mid
afternoon. rain showers and a slight chance of thunderstorms
through early afternoon, then a slight chance of rain showers by
mid afternoon. waves building to 8 to 11 feet occasionally to
14 feet. 
.tuesday night...northwest gales to 35 knots. waves subsiding to
6 to 9 feet occasionally to 11 feet. 
.wednesday...northwest winds 20 to 30 knots becoming southwest
5 to 15 knots. waves subsiding to calm to 2 feet. 
.thursday...south winds 10 to 20 knots. waves building to 1 to
3 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712463

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz267-172000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt sun may 17 2026

.rest of today...northeast winds 5 to 15 knots increasing to
10 to 20 knots late. waves 1 to 3 feet subsiding to calm to
2 feet. 
.tonight...east winds 15 to 25 knots becoming southeast 20 to
30 knots after midnight, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. a chance of rain
showers through midnight. a chance of thunderstorms. rain showers
likely after midnight. waves building to 4 to 8 feet occasionally
to 10 feet. 
.monday...south winds 20 to 30 knots diminishing to 10 to
20 knots. a chance of showers through early afternoon. a chance
of thunderstorms. showers by mid afternoon. waves subsiding to
calm to 2 feet. 
.monday night...west winds 10 to 20 knots becoming east 15 to
25 knots after midnight. a chance of rain showers through
midnight. a slight chance of thunderstorms. rain showers after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...south winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. rain showers and a slight chance of
thunderstorms through early afternoon, then a chance of rain
showers by mid afternoon. waves building to 8 to 11 feet
occasionally to 14 feet. 
.tuesday night...northwest gales to 35 knots. waves subsiding to
7 to 10 feet occasionally to 13 feet. 
.wednesday...northwest winds 20 to 30 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712458

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt sun may 17 2026 /901 am cdt sun may 17 2026/

...gale warning in effect from 2 pm edt /1 pm cdt/ this afternoon
through this evening...

.rest of today...east winds 20 to 30 knots becoming northeast
gales to 35 knots in the afternoon. a chance of rain showers by
mid afternoon. waves 3 to 6 feet occasionally to 8 feet building
to 8 to 11 feet occasionally to 14 feet. 
.tonight...northeast gales to 35 knots diminishing to 15 to
25 knots. rain showers through midnight. a chance of
thunderstorms. a chance of rain showers after midnight. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...northeast winds 10 to 20 knots. a chance of rain
showers through early afternoon. a slight chance of
thunderstorms. rain showers likely by mid afternoon. waves
subsiding to 2 to 4 feet. 
.monday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers
through midnight. a slight chance of thunderstorms. rain showers
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.tuesday...north gales to 35 knots becoming northwest 10 to
20 knots by mid afternoon. rain showers likely through early
afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots. waves calm to 2 feet.
.thursday...southeast winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 171402
glfls 
expires:202605172000;;712459

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sun may 17 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... 

ridging of 30.1 inches over lake superior this morning will push 
east as a 29.2 inch low moves out of colorado. this low will weaken 
to 29.7 inches as it reaches lake superior late tonight. another low 
pressure will follow it, reaching lake superior by tuesday morning 
at 29.7 inches. thereafter a 30.1 inch high will build into the 
midwest wednesday, strengthening to 30.4 inches over lake superior 
wednesday night. the high pressure will shift east on thursday with 
weaker ridging of 30.1 inches over the lake by thursday night.



lsz263-172000-
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-
1001 am edt sun may 17 2026

.rest of today...east winds 10 to 20 knots becoming northeast
20 to 30 knots in the afternoon, then increasing to 30 knots with
a few gale force gusts to 35 knots possible late. a slight chance
of rain showers by mid afternoon. waves 2 to 4 feet building to
6 to 9 feet occasionally to 11 feet. 
.tonight...east winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. a chance of rain showers through
midnight. a chance of thunderstorms. rain showers after midnight.
waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...north winds 10 to 20 knots veering northeast late. a
chance of rain showers through early afternoon. a slight chance
of thunderstorms. rain showers likely by mid afternoon. waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.monday night...northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. a chance of rain showers
through midnight. a slight chance of thunderstorms. rain showers
after midnight. waves building to 7 to 10 feet occasionally to
13 feet. 
.tuesday...north gales to 35 knots becoming northwest 15 to
25 knots by mid afternoon. rain showers through early afternoon.
waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...north winds 10 to 20 knots backing northwest
after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...southwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet, then building to
1 to 3 feet. 
.thursday...southwest winds 5 to 15 knots backing south. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$