fzus61 kbuf 190202
glflo 
expires:202608190900;;965727

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue aug 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...a ridge of high pressure averaging 30.0 inches will 
drift to the eastern seaboard tonight. a cold front will then move 
east across lake ontario on wednesday. behind the front, a ridge of 
high pressure averaging 30.1 inches builds from the upper great 
lakes thursday to the lower great lakes friday. this high will drift 
east to the canadian maritimes saturday as a 29.7 inch low moves 
into northwest ontario province.


loz062-190900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue aug 18 2026

.overnight...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. a chance of showers. waves 1 to
2 feet. 
.wednesday...west winds 5 to 15 knots. showers likely in the
morning, then a chance of showers early in the afternoon. waves
2 feet or less. 
.wednesday night...northwest winds 5 to 10 knots. waves 1 foot or
less. 
.thursday...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.thursday night...northwest winds 10 knots or less becoming
northeast. 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. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.sunday...west winds 10 to 15 knots becoming northwest 15 to
20 knots. showers likely during the day, then a chance of showers
sunday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 190202
glflo 
expires:202608190900;;965728

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue aug 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...a ridge of high pressure averaging 30.0 inches will 
drift to the eastern seaboard tonight. a cold front will then move 
east across lake ontario on wednesday. behind the front, a ridge of 
high pressure averaging 30.1 inches builds from the upper great 
lakes thursday to the lower great lakes friday. this high will drift 
east to the canadian maritimes saturday as a 29.7 inch low moves 
into northwest ontario province.


loz063>065-190900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue aug 18 2026

.overnight...southwest winds 10 to 15 knots. waves 2 feet
or less. 
.wednesday...southwest winds 10 to 15 knots becoming west. a
chance of showers early, then showers likely. a chance of showers
late. waves 1 to 3 feet. 
.wednesday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.thursday...northwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.thursday night...west winds 10 knots or less becoming north.
waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 15 knots. a chance of showers and
thunderstorms during the day, then showers with a chance of
thunderstorms saturday night. waves 2 feet or less. 
.sunday...southwest winds 10 to 15 knots becoming northwest 15 to
20 knots. showers with a chance of thunderstorms. waves 1 to
3 feet building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190152
glfle 
expires:202608190815;;965478

open lake forecast for lake erie
national weather service cleveland oh
952 pm 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...
a cold front will sweep across lake erie on wednesday with high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday into sunday.


lez162>164-190815-
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-
952 pm edt tue aug 18 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190152
glfle 
expires:202608190815;;965479

open lake forecast for lake erie
national weather service cleveland oh
952 pm 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...
a cold front will sweep across lake erie on wednesday with high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday into sunday.


lez165>167-190815-
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-
952 pm edt tue aug 18 2026

.overnight...southwest winds 10 to 15 knots. a chance of
showers late. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers in the morning, then a slight
chance of showers and thunderstorms early in the afternoon. a
chance of showers with a slight chance of thunderstorms late.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...west winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.thursday...northeast winds 5 to 10 knots. waves 1 foot or less. 
.thursday night...east winds 5 to 10 knots becoming southeast.
waves 1 foot or less. 
.friday...southeast winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms. waves 1 to 2 feet.
.sunday...northwest winds 10 to 15 knots. a chance of showers
during the day. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190152
glfle 
expires:202608190815;;965480

open lake forecast for lake erie
national weather service cleveland oh
952 pm 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...
a cold front will sweep across lake erie on wednesday with high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday into sunday.


lez061-168-169-190815-
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-
952 pm edt tue aug 18 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 190135
glfsc 
expires:202608190945;;965025

lake st clair forecast
national weather service detroit/pontiac mi
935 pm 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...a cold front will push across the region from north 
to south this evening. this will bring showers and thunderstorms 
and will veer winds from southwest to northwest in the wake of the
front. high pressure, 30.00 inches, will fill in behind the front
through the midweek period.


lcz460-190945-
lake st clair-
935 pm edt tue aug 18 2026

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

$$

fzus63 kdtx 190134
glflh 
expires:202608190945;;965023

open lake forecast for lake huron
national weather service detroit/pontiac mi
934 pm 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...a cold front will push across the region from north 
to south this evening. this will bring showers and thunderstorms 
and will veer winds from southwest to northwest in the wake of the
front. high pressure, 30.00 inches, will fill in behind the front
through the midweek period.


lhz462>464-190945-
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-
934 pm edt tue aug 18 2026

.rest of tonight...southwest winds 5 to 10 knots veering to the
west early in the morning. showers and a chance of thunderstorms
this evening...then a chance of showers and thunderstorms after
midnight. waves 1 to 3 feet. 
.wednesday...north winds 5 to 10 knots. a chance of showers in
the morning. waves 2 feet or less. 
.wednesday night...light and variable winds becoming north 5 to
10 knots in the late evening and overnight. waves 2 feet or less.
.thursday...north winds 5 to 10 knots. waves 2 feet or less. 
.thursday night...northeast winds 5 to 10 knots veering to the
southeast in the late evening and overnight. waves 2 feet or
less. 
.friday...south winds 5 to 10 knots becoming southeast 10 to
15 knots late in the afternoon. a chance of showers late in the
evening. waves 1 to 3 feet. 
.saturday...south winds 10 to 15 knots becoming southwest 5 to
10 knots in the late morning and early afternoon...then veering
to the west early in the evening becoming northwest 10 to
15 knots by midnight. a chance of showers early in the morning. a
chance of thunderstorms. rain showers likely . waves 1 to 3 feet
building to 2 to 4 feet by midnight. 
.sunday...northwest winds 15 to 20 knots becoming north 10 to
15 knots by midnight. a chance of showers until afternoon. waves
4 to 6 feet. waves occasionally around 8 feet. 


$$

fzus63 kdtx 190134
glflh 
expires:202608190945;;965022

open lake forecast for lake huron
national weather service detroit/pontiac mi
934 pm 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...a cold front will push across the region from north 
to south this evening. this will bring showers and thunderstorms 
and will veer winds from southwest to northwest in the wake of the
front. high pressure, 30.00 inches, will fill in behind the front
through the midweek period.


lhz362-363-190945-
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-
934 pm edt tue aug 18 2026

.rest of tonight...northwest winds 5 to 10 knots. showers and a
chance of thunderstorms this evening...then a chance of showers
after midnight. waves 1 to 3 feet. 
.wednesday...north winds 5 to 10 knots backing to the west in the
late morning and early afternoon...then veering to the west 5 to
10 knots late in the afternoon. 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...north winds 5 to 10 knots early in the morning
becoming light and variable...then becoming east 5 to 10 knots
early in the afternoon. waves 2 feet or less. 
.thursday night...southeast winds 5 to 10 knots. waves 2 feet or
less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots.
a chance of showers late in the afternoon. waves 1 to 3 feet. 
.saturday...south winds 10 to 15 knots becoming southwest 5 to
10 knots in the late morning and early afternoon...then becoming
northwest 10 to 15 knots early in the evening increasing to 15 to
20 knots by midnight. showers likely early in the morning. a
chance of thunderstorms until early evening. a chance of showers
. waves 1 to 3 feet building to 3 to 5 feet . 
.sunday...northwest winds 15 to 20 knots. gusts to 30 knots . a
chance of showers early in the morning. waves 4 to 6 feet. waves
occasionally around 8 feet. 


$$

fzus63 kdtx 190134
glflh 
expires:202608190945;;965021

open lake forecast for lake huron
national weather service detroit/pontiac mi
934 pm 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...a cold front will push across the region from north 
to south this evening. this will bring showers and thunderstorms 
and will veer winds from southwest to northwest in the wake of the
front. high pressure, 30.00 inches, will fill in behind the front
through the midweek period.


lhz361-190945-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
934 pm edt tue aug 18 2026

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


$$

fzus63 kmkx 190203
glflm 
expires:202608190915;;965751

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
903 pm cdt tue aug 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...

thundestorms will be possible over lake michigan until a cold 
front exits from north to south by wednesday morning. north- 
northwesterly winds will weaken and become more variable as high 
pressure around 30.0 inches tracks through the western great lakes
through thursday. southwesterly winds and thunderstorm chances 
return later friday as another system drags another cold front 
across the upper great lakes region.


lmz261-362-364-366-563-565-567-868-190915-
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-
903 pm cdt tue aug 18 2026

sheboygan wi to pentwater mi north...

.rest of tonight...north winds 10 to 15 kt. chance of showers and
thunderstorms late this evening. waves 2 to 4 ft subsiding to
1 to 3 ft. 
.wednesday...northwest winds 5 to 10 kt increasing to 10 to 15 kt
late in the morning, then becoming west early in the afternoon and
becoming southwest 10 to 20 kt late. waves 1 to 2 ft. 
.wednesday night...south winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft. 
.thursday...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 ft or less building to 1 to 3 ft. 
.thursday night...south winds 10 to 20 kt increasing to 15 to
25 kt. showers likely overnight. waves 1 to 3 ft. 
.friday...southwest winds to 30 kt. chance of showers in the
morning, then chance of showers and thunderstorms in the
afternoon. waves 2 to 4 ft building to 3 to 5 ft. 
.friday night...southwest winds 15 to 25 kt veering to northwest
10 to 20 kt. chance of showers. waves 3 to 5 ft subsiding to 2 to
4 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 2 to 4 ft. 
.sunday...north winds to 30 kt. waves 4 to 6 ft occasionally to
8 ft.  

$$

fzus63 kmkx 190203
glflm 
expires:202608190915;;965752

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
903 pm cdt tue aug 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...

thundestorms will be possible over lake michigan until a cold 
front exits from north to south by wednesday morning. north- 
northwesterly winds will weaken and become more variable as high 
pressure around 30.0 inches tracks through the western great lakes
through thursday. southwesterly winds and thunderstorm chances 
return later friday as another system drags another cold front 
across the upper great lakes region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-190915-
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-
903 pm cdt tue aug 18 2026

sheboygan wi to pentwater mi south...

.rest of tonight...west winds 10 to 20 kt veering to northwest
10 to 15 kt. chance of showers and thunderstorms late this
evening, then slight chance of showers and thunderstorms
overnight. waves 2 to 4 ft. 
.wednesday...north winds 10 to 15 kt. waves 1 to 3 ft. 
.wednesday night...northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. waves 1 to 2 ft. 
.thursday...southeast winds 5 to 10 kt becoming south 10 to 20 kt
in the afternoon. waves 1 ft or less building to 1 to 3 ft. 
.thursday night...south winds 10 to 20 kt becoming southwest.
waves 1 to 3 ft. 
.friday...southwest winds 10 to 20 kt increasing to 30 kt in the
afternoon. chance of showers. waves 2 to 4 ft building to 3 to
5 ft. 
.friday night...southwest winds 15 to 25 kt becoming west 10 to
20 kt. chance of showers. waves 3 to 5 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 3 to 5 ft. 
.sunday...north winds to 30 kt. waves 4 to 7 ft occasionally to
9 ft.  

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965645

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




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-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 10 to 20 knots veering northwest
late. waves 1 to 3 feet subsiding to calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots veering southwest
late. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing southeast by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. a slight
chance of thunderstorms after midnight. waves calm to 2 feet. 
.friday...southeast winds 10 to 20 knots backing east by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.friday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.saturday...northwest winds 20 to 30 knots becoming north 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 
.sunday...north winds 15 to 25 knots becoming northwest 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965646

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz267-190800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 10 to 20 knots. waves calm to
2 feet. 
.wednesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.wednesday night...west winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing northeast by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots. showers likely. waves
calm to 2 feet. 
.friday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.saturday...northwest winds 10 to 20 knots becoming north 15 to
25 knots. waves building to 2 to 4 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965641

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 pm edt tue aug 18 2026 /900 pm cdt tue aug 18 2026/

.rest of tonight...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots backing
northeast after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. a chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet. 
.thursday night...east winds 5 to 15 knots backing northeast
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.sunday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965643

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz264-190800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 5 to 15 knots veering northwest
after midnight. waves 1 to 3 feet subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. a slight chance
of showers. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering south. waves calm to
2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965642

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




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-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 5 to 15 knots veering northwest
late. waves 1 to 3 feet subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest
late. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds less than 10 knots becoming southeast
5 to 15 knots by mid afternoon. a slight chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet. 
.thursday night...southeast winds 5 to 15 knots backing east
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering southeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 190201
glfls 
expires:202608190800;;965644

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

weak 29.9 inch ridging over lake superior tonight and early 
wednesday morning builds to 30.0 inches wednesday afternoon as high 
pressure over the canadian prairies and northern plains tonight 
moves into the upper great lakes. this high then expands into the 
rest of the great lakes by thursday as it strengthens to 30.1 
inches. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario, bringing 29.9 inch 
troughing over lake superior friday into saturday. this is quickly 
followed by 30.1 inch ridging for the latter part of the weekend 
into early next week via a 30.2 inch parent high from canada.




lsz265-190800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 pm edt tue aug 18 2026

.rest of tonight...west winds 15 to 25 knots. waves calm to
2 feet. 
.wednesday...northwest winds 10 to 20 knots veering north in the
afternoon, then becoming northeast 5 to 15 knots late. waves calm
to 2 feet. 
.wednesday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. waves calm
to 2 feet. 
.thursday...southwest winds 5 to 15 knots becoming southeast
10 to 20 knots by mid afternoon. a slight chance of showers by
mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers. waves calm to 2 feet. 
.friday...southeast winds 10 to 20 knots backing east by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.friday night...northwest winds 10 to 20 knots. waves calm to
2 feet. 
.saturday...northwest winds 20 to 30 knots becoming north 15 to
25 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.sunday...north winds 15 to 25 knots becoming south 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$