fzus61 kbuf 182002
glflo 
expires:202605190300;;785052

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon may 18 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...an area of low pressure developing over the central 
plains today will weaken from 29.4 inches to 29.6 inches as it 
tracks northeast to the upper great lakes tonight 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. high pressure will move to the east and weaken to 
30.1 inches friday. a 29.9 inch low will track across the ohio 
valley and near the lake saturday.


loz062-190300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt mon may 18 2026

.tonight...southwest winds 10 to 15 knots. a chance of showers
after midnight. waves 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms in the evening, then
showers likely overnight. waves 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots. showers likely in the
morning. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots becoming north.
waves 1 to 3 feet. 
.thursday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
showers likely friday night. waves 2 feet or less building to
2 to 4 feet. 
.saturday...east winds 15 to 25 knots diminishing to 10 to
15 knots. showers likely during the day, then a chance of showers
saturday night. waves 3 to 6 feet subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 182002
glflo 
expires:202605190300;;785053

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon may 18 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...an area of low pressure developing over the central 
plains today will weaken from 29.4 inches to 29.6 inches as it 
tracks northeast to the upper great lakes tonight 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. high pressure will move to the east and weaken to 
30.1 inches friday. a 29.9 inch low will track across the ohio 
valley and near the lake saturday.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon may 18 2026

.tonight...south winds 5 to 10 knots becoming southwest. a chance
of showers. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers likely with a chance of thunderstorms in the evening,
then showers likely overnight. waves 2 to 4 feet building to 3 to
5 feet. 
.wednesday...west winds 15 to 25 knots. a chance of showers in
the morning. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday night...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.thursday...north winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 15 knots. a chance of showers friday
night. waves 1 to 3 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 10 to
15 knots. showers likely. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181939
glfle 
expires:202605190215;;784081

open lake forecast for lake erie
national weather service cleveland oh
339 pm edt mon may 18 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...
pressure will fall tonight and tuesday ahead of a cold front late
tuesday into early tuesday night. a ridge averaging 30.30 inches 
will build in wednesday holding through thursday night. a trough
averaging 30.30 inches moves in for the weekend.



lez164-190215-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
339 pm edt mon may 18 2026

.tonight...southwest winds 10 to 15 knots. showers likely with a
chance of thunderstorms this evening, then a slight chance of
showers and thunderstorms after midnight. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers early, then a chance of showers
with a slight chance of thunderstorms late in the morning. a
chance of showers and thunderstorms late. waves 1 to 3 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers with a chance of thunderstorms.
waves 2 to 3 feet. 
.wednesday...northeast winds 10 to 15 knots. showers likely in
the morning. waves 1 to 3 feet. 
.wednesday night...northeast winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. waves 2 to 3 feet. 
.friday...east winds 15 to 20 knots becoming southeast. showers
likely during the day, then showers friday night. waves 1 to
3 feet. 
.saturday...southeast winds 5 to 15 knots becoming south. showers
likely with a chance of thunderstorms during the day, then a
chance of showers saturday night. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181939
glfle 
expires:202605190215;;784083

open lake forecast for lake erie
national weather service cleveland oh
339 pm edt mon may 18 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...
pressure will fall tonight and tuesday ahead of a cold front late
tuesday into early tuesday night. a ridge averaging 30.30 inches 
will build in wednesday holding through thursday night. a trough
averaging 30.30 inches moves in for the weekend.



lez165>168-190215-
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-
339 pm edt mon may 18 2026

.tonight...southwest winds 10 to 15 knots becoming south. a
chance of showers and thunderstorms this evening, then a slight
chance of showers and thunderstorms after midnight. a slight
chance of showers late. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers early, then a slight chance of
showers late in the morning. a slight chance of showers and
thunderstorms late. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers with a chance of thunderstorms.
waves 2 to 4 feet. 
.wednesday...north winds 10 to 15 knots. showers likely in the
morning. waves 1 to 3 feet. 
.wednesday night...north winds 10 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming east. waves
2 to 4 feet. 
.friday...east winds 15 to 20 knots. a chance of showers during
the day, then showers friday night. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.saturday...southeast winds 15 to 20 knots becoming south 5 to
15 knots. showers likely during the day, then a chance of showers
saturday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181939
glfle 
expires:202605190215;;784082

open lake forecast for lake erie
national weather service cleveland oh
339 pm edt mon may 18 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...
pressure will fall tonight and tuesday ahead of a cold front late
tuesday into early tuesday night. a ridge averaging 30.30 inches 
will build in wednesday holding through thursday night. a trough
averaging 30.30 inches moves in for the weekend.



lez162-163-190215-
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-
339 pm edt mon may 18 2026

...severe thunderstorm watch 223 in effect until 9 pm edt this
evening...

.tonight...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers and thunderstorms this evening,
then a chance of showers with a slight chance of thunderstorms
after midnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. a
chance of showers with a slight chance of thunderstorms early,
then a slight chance of showers and thunderstorms. a chance of
showers and thunderstorms late. waves 1 to 3 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers with a chance of thunderstorms.
waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast. a
chance of showers in the morning. waves 1 to 3 feet. 
.wednesday night...northeast winds 10 to 15 knots increasing to
15 to 20 knots. waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming east. waves
1 to 3 feet. 
.friday...east winds 15 to 20 knots. a chance of showers during
the day, then showers friday night. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers and thunderstorms during the day,
then a chance of showers saturday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181939
glfle 
expires:202605190215;;784084

open lake forecast for lake erie
national weather service cleveland oh
339 pm edt mon may 18 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...
pressure will fall tonight and tuesday ahead of a cold front late
tuesday into early tuesday night. a ridge averaging 30.30 inches 
will build in wednesday holding through thursday night. a trough
averaging 30.30 inches moves in for the weekend.



lez061-169-190215-
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-
339 pm edt mon may 18 2026

.tonight...southwest winds 5 to 10 knots. a slight chance of
showers and thunderstorms from late evening on. waves 1 to
2 feet. 
.tuesday...southwest winds 10 to 15 knots. a chance of showers
early, then a slight chance of showers late in the morning. waves
1 to 2 feet. 
.tuesday night...southwest winds 10 to 15 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 3 feet. 
.wednesday...northwest winds 5 to 10 knots becoming west. showers
likely in the morning. waves 1 to 3 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming
northeast. waves 1 to 2 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. waves
2 feet or less. 
.friday...east winds 10 to 15 knots. a chance of showers during
the day, then showers likely friday night. waves 2 feet or less. 
.saturday...east winds 5 to 15 knots becoming southeast. showers
likely. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 181920
glfsc 
expires:202605190330;;783315

lake st clair forecast
national weather service detroit/pontiac mi
320 pm edt mon may 18 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...strong to severe thunderstorms are likely this
afternoon-evening and again possible tuesday as a cold front
sweeps across the region. high pressure, 30.50 inches, then
builds in mid-week.


lcz460-190330-
lake st clair-
320 pm edt mon may 18 2026

...small craft advisory in effect until 10 pm edt this evening...
...severe thunderstorm watch 221 in effect until 8 pm edt this
evening...

.tonight...southwest winds 15 to 20 knots diminishing to 10 to 15
knots after midnight. mostly cloudy becoming partly cloudy after
midnight becoming mostly cloudy. light showers likely early in the
evening. a chance of thunderstorms in the evening. a chance of light
showers in the late evening and overnight. waves 1 to 3 feet.
.tuesday...southwest winds 15 to 20 knots increasing to 20 to 25
knots with gusts to 30 knots in the afternoon. mostly cloudy early
in the morning becoming partly sunny. a chance of light showers
early in the morning. light showers likely and a chance of
thunderstorms late in the afternoon. waves 1 to 3 feet building to 2
to 4 feet in the afternoon.
.tuesday night...southwest winds 15 to 20 knots becoming west 10 to
15 knots by midnight...then becoming north 15 to 20 knots after
midnight. mostly cloudy. showers likely early in the evening. a
chance of thunderstorms. a chance of light showers in the late
evening and overnight. waves 1 to 3 feet.
.wednesday...north winds 15 to 20 knots diminishing to 10 to 15
knots in the late morning and afternoon. partly sunny. a chance of
light showers early in the morning. waves 2 feet or less.
.wednesday night...northeast winds 15 to 20 knots diminishing to 10
to 15 knots after midnight. partly cloudy. waves 1 to 3 feet.
.thursday...northeast winds 10 to 15 knots diminishing to 5 to 10
knots in the afternoon...then increasing to 10 to 15 knots in the
evening. mostly sunny becoming partly cloudy. waves 2 feet or less.
.friday...east winds 20 to 25 knots. mostly cloudy. showers likely.
waves 1 to 3 feet.
.saturday...east winds 20 to 25 knots. mostly cloudy with showers
likely. waves 2 feet or less.

$$

fzus63 kdtx 181920
glflh 
expires:202605190330;;783254

open lake forecast for lake huron
national weather service detroit/pontiac mi
320 pm edt mon may 18 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...strong to severe thunderstorms are likely this
afternoon-evening and again possible tuesday as a cold front
sweeps across the region. high pressure, 30.50 inches, then
builds in mid-week.


lhz361-190330-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
320 pm edt mon may 18 2026

...severe thunderstorm watch 221 in effect until 8 pm edt this
evening...

.tonight...southeast winds 5 to 10 knots backing to the east by
midnight...then veering to the south early in the morning. a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet in
the late evening and overnight. 
.tuesday...southeast winds 10 to 15 knots becoming south 15 to
20 knots in the late morning and early afternoon...then veering
to the southwest late in the afternoon. a chance of showers.
waves 3 to 5 feet building to 4 to 6 feet late in the afternoon.
waves occasionally around 8 feet. 
.tuesday night...west winds 15 to 20 knots becoming northwest
20 to 25 knots with gusts to around 30 knots in the late evening
and overnight. a chance of showers in the evening. waves 6 to
9 feet. waves occasionally around 12 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots in the late morning and
afternoon. waves 5 to 7 feet. waves occasionally around 10 feet. 
.wednesday night...northwest winds 15 to 20 knots decreasing to
5 to 10 knots. waves 3 to 5 feet subsiding to 1 to 3 feet after
midnight. 
.thursday...light and variable winds becoming east 5 to 10 knots
late in the morning...then becoming light and variable late in
the evening. waves 2 feet or less. 
.friday...east winds 5 to 10 knots increasing to 15 to 20 knots.
a chance of. waves 2 feet or less building to 2 to 4 feet. 
.saturday...east winds 20 to 25 knots decreasing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet. 


$$

fzus63 kdtx 181920
glflh 
expires:202605190330;;783255

open lake forecast for lake huron
national weather service detroit/pontiac mi
320 pm edt mon may 18 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...strong to severe thunderstorms are likely this
afternoon-evening and again possible tuesday as a cold front
sweeps across the region. high pressure, 30.50 inches, then
builds in mid-week.


lhz362-363-190330-
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-
320 pm edt mon may 18 2026

...severe thunderstorm watch 221 in effect until 8 pm edt this
evening...

.tonight...south winds 10 to 15 knots increasing to 15 to
20 knots early in the morning. a chance of showers and
thunderstorms in the evening...then a chance of showers after
midnight. waves 4 to 6 feet. waves occasionally around 8 feet. 
.tuesday...south winds 15 to 20 knots increasing to 20 to
25 knots early in the afternoon...then decreasing to 15 to
20 knots late in the afternoon. a chance of showers. waves 4 to
6 feet building to 6 to 9 feet in the afternoon. waves
occasionally around 12 feet. 
.tuesday night...southwest winds 15 to 20 knots veering to the
northwest with gusts to around 30 knots in the late evening and
overnight. a chance of showers in the evening. waves 6 to 9 feet.
waves occasionally around 12 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots in the late morning and
afternoon. waves 6 to 9 feet. waves occasionally around 12 feet. 
.wednesday night...north winds 15 to 20 knots becoming northwest
10 to 15 knots after midnight. waves 4 to 6 feet. waves
occasionally around 8 feet. 
.thursday...northeast winds 5 to 10 knots becoming light and
variable...then becoming northeast 5 to 10 knots late in the
evening. waves 1 to 3 feet. 
.friday...east winds 5 to 10 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet by midnight. 
.saturday...east winds 15 to 20 knots decreasing to 10 to
15 knots . a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet by midnight. 


$$

fzus63 kdtx 181920
glflh 
expires:202605190330;;783256

open lake forecast for lake huron
national weather service detroit/pontiac mi
320 pm edt mon may 18 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...strong to severe thunderstorms are likely this
afternoon-evening and again possible tuesday as a cold front
sweeps across the region. high pressure, 30.50 inches, then
builds in mid-week.


lhz462>464-190330-
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-
320 pm edt mon may 18 2026

...severe thunderstorm watch 221 in effect until 8 pm edt this
evening...

.tonight...south winds 10 to 15 knots. showers likely and a
chance of thunderstorms in the evening...then a chance of showers
after midnight. waves 3 to 5 feet. 
.tuesday...south winds 15 to 20 knots. a chance of showers in the
morning...then a chance of showers and thunderstorms in the
afternoon. waves 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots in the late evening and overnight. a chance of
showers and thunderstorms in the evening...then a chance of
showers after midnight. waves 3 to 5 feet. 
.wednesday...north winds 10 to 15 knots. waves 4 to 6 feet. waves
occasionally around 8 feet. 
.wednesday night...north winds 10 to 15 knots. waves 3 to 5 feet.
.thursday...northeast winds 5 to 10 knots becoming north 10 to
15 knots late in the afternoon...then becoming northeast 5 to
10 knots late in the evening. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.friday...east winds 5 to 10 knots increasing to 15 to 20 knots.
a chance of showers by midnight. waves 1 to 3 feet building to
2 to 4 feet by midnight. 
.saturday...east winds 15 to 20 knots decreasing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 


$$

fzus63 kmkx 181952
glflm 
expires:202605190330;;784558

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
252 pm cdt mon may 18 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...

storms and showers are pushing out as winds behind this remain
breezy from the south. these winds will increase slightly 
across the lake late tonight and remain breezy ahead of the cold
frontal passage expected tuesday afternoon as the low pressure 
system around 29.6 inches swings northeast of the lake into 
ontario. a few storms chances across primarily the south part of
the lake late tonight into tuesday morning ahead of the front. 
high pressure around 30.4 inches will push in behind the front 
with light and variable winds taking hold from late wednesday 
into thursday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-190330-
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-
252 pm cdt mon may 18 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 10 to 20 kt increasing to 30 kt. slight
chance of showers and thunderstorms this evening, then chance of
showers and thunderstorms overnight. patchy fog overnight. waves
3 to 5 ft building to 4 to 7 ft occasionally to 9 ft. 
.tuesday...south winds to 30 kt becoming west 15 to 25 kt. patchy
fog in the morning. slight chance of showers and thunderstorms in
the morning, then chance of showers and slight chance of
thunderstorms in the afternoon. waves 4 to 7 ft occasionally to
9 ft subsiding to 4 to 6 ft occasionally to 8 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north.
waves 3 to 5 ft. 
.wednesday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.wednesday night...northeast winds 15 to 25 kt diminishing to
10 to 20 kt. waves 4 to 6 ft occasionally to 8 ft. 
.thursday...east winds 10 to 20 kt becoming northeast. waves 2 to
4 ft. 
.thursday night...northeast winds 10 to 20 kt becoming east.
waves 2 to 4 ft. 
.friday...east winds 10 to 20 kt becoming northeast. chance of
showers. waves 2 to 4 ft. 
.saturday...northeast winds 10 to 20 kt becoming north 10 to
15 kt. waves 1 to 3 ft.  

$$

fzus63 kmkx 181952
glflm 
expires:202605190330;;784557

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
252 pm cdt mon may 18 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...

storms and showers are pushing out as winds behind this remain
breezy from the south. these winds will increase slightly 
across the lake late tonight and remain breezy ahead of the cold
frontal passage expected tuesday afternoon as the low pressure 
system around 29.6 inches swings northeast of the lake into 
ontario. a few storms chances across primarily the south part of
the lake late tonight into tuesday morning ahead of the front. 
high pressure around 30.4 inches will push in behind the front 
with light and variable winds taking hold from late wednesday 
into thursday.


lmz261-362-364-366-563-565-567-868-190330-
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-
252 pm cdt mon may 18 2026

sheboygan wi to pentwater mi north...

.tonight...south winds 10 to 20 kt increasing to 30 kt. patchy
fog this evening, then areas of dense fog overnight. chance of
showers and thunderstorms overnight. waves 3 to 5 ft building to
4 to 7 ft occasionally to 9 ft. 
.tuesday...south winds to 30 kt becoming west 15 to 25 kt. patchy
fog. slight chance of showers and thunderstorms in the morning,
then chance of showers in the afternoon. waves 4 to 7 ft
occasionally to 9 ft subsiding to 4 to 6 ft occasionally to 8 ft.
.tuesday night...northwest winds 15 to 25 kt. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.wednesday...north winds 15 to 25 kt. waves 2 to 4 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
5 to 10 kt overnight. waves 1 to 3 ft. 
.thursday...east winds 5 to 10 kt becoming northeast 10 to 20 kt
in the afternoon. waves 1 to 2 ft. 
.thursday night...northeast winds 10 to 15 kt becoming east.
waves 1 to 3 ft. 
.friday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 2 to 4 ft. 
.saturday...northeast winds 15 to 25 kt. chance of rain showers.
waves 2 to 4 ft.  

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785035

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt mon may 18 2026 /301 pm cdt mon may 18 2026/

.late this afternoon...northeast winds 5 to 15 knots. patchy fog.
waves 1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight. patchy fog. a chance of showers and
thunderstorms through midnight. rain showers after midnight.
waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 10 to 20 knots. patchy fog through early
afternoon. a chance of rain showers through early afternoon.
waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...east winds 5 to 15 knots. waves building to
1 to 3 feet, then subsiding to calm to 2 feet. 
.friday...east winds 10 to 20 knots backing northeast. a chance
of rain showers. waves building to 1 to 3 feet, then subsiding to
calm to 2 feet. 
.saturday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785036

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz263-190800-
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-
401 pm edt mon may 18 2026

.late this afternoon...northeast winds 10 to 20 knots. patchy
fog. waves 1 to 3 feet. 
.tonight...northeast winds 15 to 25 knots. patchy fog. 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...north winds 10 to 20 knots backing west in the
afternoon. patchy fog through early afternoon. a chance of rain
showers through early afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming south 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 
.saturday...east winds 5 to 15 knots. a chance of rain showers.
waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785037

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz264-190800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt mon may 18 2026

...dense fog advisory in effect until 11 am edt tuesday...

.late this afternoon...northeast winds 5 to 15 knots. patchy fog.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...northeast winds 15 to 25 knots veering east late.
patchy dense fog. 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...north winds 15 to 25 knots backing northwest in the
afternoon. patchy fog through early afternoon. a chance of rain
showers through early afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots. waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to
3 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...south winds 5 to 15 knots backing southeast by mid
afternoon. waves building to 1 to 3 feet. 
.thursday night...southeast winds 5 to 15 knots veering south
after midnight. waves building to 2 to 4 feet, then subsiding to
1 to 3 feet. 
.friday...east winds 5 to 15 knots. waves 1 to 3 feet. 
.saturday...east winds 5 to 15 knots veering southeast. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785038

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz265-190800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt mon may 18 2026

...dense fog advisory in effect until 11 am edt tuesday...

.late this afternoon...north winds 10 to 20 knots. patchy fog.
waves calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
patchy fog through midnight. areas of dense fog after midnight. a
chance of rain showers through midnight. a chance of
thunderstorms. rain showers after midnight. waves building to
1 to 3 feet. 
.tuesday...west winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon, then veering northwest late. patchy fog through
early afternoon. a chance of rain showers through early
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday night...northwest winds 15 to 25 knots. waves building
to 3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...south winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.thursday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. waves subsiding to 1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots veering southeast. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785039

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz266-190800-
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-
401 pm edt mon may 18 2026

...dense fog advisory in effect until 11 am edt tuesday...

.late this afternoon...north winds 10 to 20 knots. patchy fog.
waves 1 to 3 feet. 
.tonight...northeast winds 10 to 20 knots veering southeast late.
areas of dense fog. a chance of rain showers through midnight. a
chance of thunderstorms. rain showers likely after midnight.
waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon. patchy fog through early afternoon. a
chance of rain showers and a slight chance of thunderstorms
through early afternoon. waves building to 5 to 8 feet
occasionally to 10 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves subsiding
to 4 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots backing south after
midnight. waves subsiding to calm to 2 feet. 
.thursday...south winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet. 
.thursday night...southeast winds 10 to 20 knots veering south
after midnight. waves building to 2 to 4 feet, then subsiding to
1 to 3 feet. 
.friday...east winds 10 to 20 knots. waves 1 to 3 feet. 
.saturday...east winds 10 to 20 knots veering southeast. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202605190800;;785040

open lake forecast for lake superior
national weather service marquette mi
401 pm edt mon may 18 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... 

low pressure will weaken to 29.9 inches over lake superior tonight. 
another low will follow, reaching lake superior by tuesday morning 
at 29.6 inches. afterwards, a 30.2 inch high over the northern 
plains builds to 30.4 inches tuesday night into wednesday as it 
tracks eastward into the upper great lakes. the high pressure shifts 
east on thursday while leaving lingering ridging of at least 30.1 
inches over lake superior into friday. a 29.9 inch low lifts into 
the great lakes from the southern plains for saturday, but 30.1 inch 
ridging persists over lake superior.



lsz267-190800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt mon may 18 2026

...dense fog advisory in effect until 2 pm edt tuesday...

.late this afternoon...northeast winds 5 to 15 knots. areas of
dense fog. waves calm to 2 feet. 
.tonight...east winds 10 to 20 knots becoming southeast 15 to
25 knots late. areas of dense fog. a chance of showers and
thunderstorms. waves building to 1 to 3 feet. 
.tuesday...south winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then becoming northwest to 30 knots
with a few gale force gusts to 35 knots possible late. areas of
dense fog through early afternoon. patchy fog by mid afternoon. a
slight chance of thunderstorms through early afternoon. a chance
of rain showers. waves building to 5 to 8 feet occasionally to
10 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves subsiding
to 4 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.wednesday night...northwest winds 5 to 15 knots backing south
after midnight. waves subsiding to calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots.
waves building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.saturday...east winds 10 to 20 knots veering southeast. waves
calm to 2 feet. 

$$