fzus61 kbuf 180201
glflo 
expires:202608180900;;910673

open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt mon aug 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 ridge of high pressure averaging 30.0 inches will 
build over the lower great lakes tonight through tuesday, then drift 
to the eastern seaboard wednesday. a cold front will cross the lake 
wednesday before another 30.1 inch high builds into the great lakes 
thursday through friday.


loz062-180900-
lake ontario open waters from the niagara river to hamlin beach-
1001 pm edt mon aug 17 2026

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

$$

fzus61 kbuf 180201
glflo 
expires:202608180900;;910674

open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt mon aug 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 ridge of high pressure averaging 30.0 inches will 
build over the lower great lakes tonight through tuesday, then drift 
to the eastern seaboard wednesday. a cold front will cross the lake 
wednesday before another 30.1 inch high builds into the great lakes 
thursday through friday.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt mon aug 17 2026

.overnight...north winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.tuesday...north winds 10 knots or less becoming west. waves
1 foot or less. 
.tuesday night...west winds 5 to 15 knots becoming southwest. a
chance of showers overnight. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming west.
showers likely in the morning, then showers likely with a chance
of thunderstorms in the afternoon. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 15 knots becoming northwest. a
chance of showers in the evening. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.friday...northwest winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers during
the day, then showers likely saturday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180735
glfle 
expires:202608181415;;925317

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez162>164-181415-
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-
335 am edt tue aug 18 2026

.today...west winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tonight...southwest winds 10 to 15 knots becoming west. a chance
of showers with a slight chance of thunderstorms after midnight.
waves 2 feet or less. 
.wednesday...west winds 5 to 15 knots becoming northwest less
than 10 knots. a chance of showers. waves 2 feet or less. 
.wednesday night...north winds 10 knots or less becoming east. a
chance of showers in the evening. waves 1 foot or less. 
.thursday...east winds 5 to 10 knots becoming southeast. waves
1 foot or less. 
.friday...south winds 10 knots or less. waves 1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming northwest. 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 180735
glfle 
expires:202608181415;;925318

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez165>167-181415-
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-
335 am edt tue aug 18 2026

.today...north winds 10 knots or less becoming west. waves 1 foot
or less. 
.tonight...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers with a slight chance of
thunderstorms after midnight. waves 1 to 3 feet building to 2 to
4 feet. 
.wednesday...west winds 5 to 15 knots. a chance of showers. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...north winds 5 to 10 knots becoming east. a
chance of showers in the evening. waves 2 feet or less. 
.thursday...east winds 5 to 10 knots. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming west. a
chance of showers during the day, then showers likely with a
chance of thunderstorms saturday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180735
glfle 
expires:202608181415;;925319

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez061-168-169-181415-
ripley to buffalo ny extending from 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-
335 am edt tue aug 18 2026

.today...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.tonight...southwest winds 10 to 15 knots. a chance of showers
with a slight chance of thunderstorms after midnight. waves 1 to
3 feet building to 2 to 4 feet. 
.wednesday...west winds 10 to 15 knots. showers likely in the
morning, then a chance of showers in the afternoon. waves 2 to
4 feet. 
.wednesday night...west winds 5 to 10 knots becoming northeast.
waves 1 to 2 feet. 
.thursday...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers during the day, then showers likely with a
chance of thunderstorms saturday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925234

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz462>464-181545-
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-
333 am edt tue aug 18 2026

.today...southwest winds 5 to 10 knots becoming south 10 to
15 knots late in the afternoon. waves 2 feet or less. 
.tonight...south winds 10 to 15 knots decreasing to 5 to 10 knots
late in the evening...then veering to the west after midnight
increasing to 10 to 15 knots early in the morning. showers and a
chance of thunderstorms in the evening...then a chance of showers
after midnight. waves 1 to 3 feet. 
.wednesday...northwest winds 10 to 15 knots becoming north 5 to
10 knots in the late morning and afternoon. a chance of showers
in the morning. waves 1 to 3 feet. 
.wednesday night...light and variable winds. waves 2 feet or
less. 
.thursday...north winds 5 to 10 knots veering to the southeast
late in the evening. waves 2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots
by midnight. a chance of showers by midnight. waves 1 to 3 feet. 
.saturday...south winds 10 to 15 knots decreasing to 5 to
10 knots early in the evening...then becoming northwest 10 to
15 knots by midnight. a chance of showers until afternoon. a
chance of thunderstorms. rain showers likely . waves 1 to 3 feet.


$$

fzus63 kdtx 180733
glfsc 
expires:202608181545;;925236

lake st clair forecast
national weather service detroit/pontiac mi
333 am edt tue aug 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lcz460-181545-
lake st clair-
333 am edt tue aug 18 2026

.today...west winds 5 to 10 knots backing to the south early in the
afternoon...then increasing to 10 to 15 knots late in the afternoon.
mostly sunny. waves 2 feet or less.
.tonight...southwest winds 10 to 15 knots veering to the west early
in the morning. partly cloudy becoming mostly cloudy by midnight
becoming partly cloudy. a chance of light showers after midnight.
waves 2 feet or less.
.wednesday...northwest winds 10 to 15 knots becoming north 5 to 10
knots in the late morning and afternoon. mostly sunny. a chance of
light showers in the late morning and early afternoon. waves 2 feet
or less.
.wednesday night...northeast winds 5 to 10 knots. mostly clear.
waves 2 feet or less.
.thursday...east winds 5 to 10 knots. mostly clear. waves 2 feet or
less.
.friday...south winds 10 to 15 knots. mostly clear. waves 2 feet or
less.
.saturday...west winds 5 to 10 knots. partly cloudy. a chance of
showers and thunderstorms. waves 2 feet or less.

$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925232

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz361-181545-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
333 am edt tue aug 18 2026

.today...southwest winds 10 to 15 knots veering to the west late
in the afternoon. a chance of showers in the morning...then a
chance of showers and thunderstorms in the afternoon. waves 1 to
3 feet. 
.tonight...northwest winds 10 to 15 knots decreasing to 5 to
10 knots early in the morning. a chance of showers and
thunderstorms in the evening. waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 10 knots becoming west 10 to
15 knots early in the afternoon. waves 1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots decreasing to
5 to 10 knots in the late evening and overnight. waves 2 feet or
less. 
.thursday...light and variable winds becoming southeast 5 to
10 knots late in the afternoon...then veering to the south late
in the evening. waves 2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots
in the late morning and early afternoon...then decreasing to 5 to
10 knots . a chance of showers early in the morning. rain showers
likely. a chance of thunderstorms by midnight. waves 1 to 3 feet.
.saturday...southwest winds 10 to 15 knots veering to the west
early in the evening...then becoming northwest 15 to 20 knots by
midnight. a chance of showers. a chance of thunderstorms until
early evening. waves 1 to 3 feet building to 2 to 4 feet . 


$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925233

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz362-363-181545-
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-
333 am edt tue aug 18 2026

.today...southwest winds 5 to 10 knots becoming south 10 to
15 knots in the late morning and afternoon. a chance of showers
and thunderstorms in the afternoon. waves 1 to 3 feet. 
.tonight...south winds 5 to 10 knots becoming northwest 10 to
15 knots after midnight. a chance of showers and thunderstorms in
the evening...then a chance of showers after midnight. waves 1 to
3 feet. 
.wednesday...northwest winds 5 to 10 knots. waves 1 to 3 feet. 
.wednesday night...north winds 5 to 10 knots backing to the
northwest after midnight. waves 1 to 3 feet. 
.thursday...northwest winds 5 to 10 knots in the morning becoming
light and variable...then becoming southeast 5 to 10 knots late
in the afternoon. waves 2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots.
a chance of showers. waves 1 to 3 feet. 
.saturday...southwest winds 10 to 15 knots veering to the
northwest by midnight. a chance of showers. a chance of
thunderstorms until early evening. waves 2 to 4 feet. 


$$

fzus63 kmkx 180208
glflm 
expires:202608180930;;911100

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 pm cdt mon aug 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 slow-moving low pressure trough of around 29.9 inches will slide
across lake michigan during the day tuesday. winds will be
predominantly westerly. a few storms are possible within the 
vicinity of the trough/front through tuesday night. an isolated 
stronger storm with gusty winds and hail cannot be ruled out. high
pressure of 30.0 inches will move through the western great lakes
wednesday through thursday, with light and variable winds 
prevailing across the waters. the next thunderstorm chances arrive
friday afternoon and evening, when the next cold front is 
expected to move across lake michigan.


lmz080-669-671-673-675-777-779-870-872-874-876-878-180930-
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-
908 pm cdt mon aug 17 2026

sheboygan wi to pentwater mi south...

.rest of tonight...southwest winds 10 to 15 kt becoming west
10 to 20 kt. waves 1 to 3 ft. 
.tuesday...west winds 10 to 20 kt becoming southwest. chance of
showers and slight chance of thunderstorms in the afternoon.
waves 2 to 4 ft. 
.tuesday night...southwest winds 10 to 20 kt veering to northwest
10 to 15 kt. chance of showers and thunderstorms in the evening.
waves 2 to 4 ft. 
.wednesday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
5 to 10 kt overnight. waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft. 
.thursday night...southeast winds 10 to 20 kt becoming south.
waves 1 to 3 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.saturday...west winds 15 to 25 kt becoming northwest. waves 2 to
4 ft.  

$$

fzus63 kmkx 180208
glflm 
expires:202608180930;;911099

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
908 pm cdt mon aug 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 slow-moving low pressure trough of around 29.9 inches will slide
across lake michigan during the day tuesday. winds will be
predominantly westerly. a few storms are possible within the 
vicinity of the trough/front through tuesday night. an isolated 
stronger storm with gusty winds and hail cannot be ruled out. high
pressure of 30.0 inches will move through the western great lakes
wednesday through thursday, with light and variable winds 
prevailing across the waters. the next thunderstorm chances arrive
friday afternoon and evening, when the next cold front is 
expected to move across lake michigan.


lmz261-362-364-366-563-565-567-868-180930-
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-
908 pm cdt mon aug 17 2026

sheboygan wi to pentwater mi north...

.rest of tonight...south winds 10 to 15 kt becoming southwest
10 to 20 kt. waves 1 to 3 ft. 
.tuesday...southwest winds 10 to 20 kt. slight chance of showers
and thunderstorms in the morning, then chance of showers and
thunderstorms in the afternoon. waves 2 to 4 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north 10 to
15 kt. chance of showers and thunderstorms in the evening. waves
2 to 4 ft. 
.wednesday...northwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 2 ft. 
.wednesday night...east winds 10 to 15 kt becoming northeast.
waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt veering to southeast 10 to
20 kt in the afternoon. waves 1 ft or less building to 1 to 2 ft.
.thursday night...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 1 to 3 ft. 
.friday...southwest winds to 30 kt. chance of showers. waves 2 to
4 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
chance of showers. waves 2 to 4 ft.  

$$