fzus61 kbuf 150802
glflo 
expires:202608151500;;221100

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat aug 15 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 high pressure ridge averaging 30.2 inches impacts lake ontario 
today before the ridge begins to exit eastward tonight. a low of 
29.7 inches should move generally southeastward from near the 
northern great lakes to near southern new england tonight through 
monday. this low track should allow a warm front to drift 
northeastward across lake ontario later on sunday before a cold 
front sweeps eastward across the lake sunday night. behind the cold 
front, a trough averaging 29.8 inches should linger over lake 
ontario on monday. a high pressure ridge averaging 30.0 inches 
should build from the upper midwest monday night and traverse lake 
ontario on tuesday. this ridge should exit slowly eastward tuesday 
night through wednesday as a cold front approaches from the 
northwest.


loz062-151500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sat aug 15 2026

.today...east winds 5 to 15 knots. waves 1 to 3 feet. 
.tonight...east winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.sunday...southeast winds 5 to 15 knots becoming east. a chance
of showers in the afternoon. waves 1 to 3 feet. 
.sunday night...southeast winds 10 knots or less becoming
northwest. a chance of showers. waves 1 foot or less. 
.monday...northwest winds 5 to 10 knots. waves 1 foot or less. 
.tuesday...west winds 10 knots or less becoming southwest 10 to
15 knots. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming northwest.
showers likely. waves 1 to 3 feet. 

$$

fzus61 kbuf 150802
glflo 
expires:202608151500;;221101

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat aug 15 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 high pressure ridge averaging 30.2 inches impacts lake ontario 
today before the ridge begins to exit eastward tonight. a low of 
29.7 inches should move generally southeastward from near the 
northern great lakes to near southern new england tonight through 
monday. this low track should allow a warm front to drift 
northeastward across lake ontario later on sunday before a cold 
front sweeps eastward across the lake sunday night. behind the cold 
front, a trough averaging 29.8 inches should linger over lake 
ontario on monday. a high pressure ridge averaging 30.0 inches 
should build from the upper midwest monday night and traverse lake 
ontario on tuesday. this ridge should exit slowly eastward tuesday 
night through wednesday as a cold front approaches from the 
northwest.


loz063>065-151500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat aug 15 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 150738
glfle 
expires:202608151415;;220394

open lake forecast for lake erie
national weather service cleveland oh
338 am edt sat aug 15 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 warm front will lift across the region tonight into sunday as 
low pressure 29.90 inches moves east across the upper great lakes.
this low will push a cold front across lake erie as it moves east
into southern quebec. high pressure 30.10 inches will build across
the region monday and tuesday before the next cold front 
approaches from the west on wednesday.


lez162>164-151415-
detroit river lt. to maumee bay oh to reno beach oh beyond 5nm
offshoreline to us-canadian border-
reno beach to the islands oh beyond 5nm off shoreline to us-
canadian border-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
338 am edt sat aug 15 2026

.today...east winds 5 to 10 knots. a slight chance of showers
from late morning on. waves 1 foot or less. 
.tonight...east winds around 10 knots becoming south. showers
likely with a chance of thunderstorms in the evening, then a
chance of showers with a slight chance of thunderstorms after
midnight. waves 2 feet or less. 
.sunday...west winds 10 to 15 knots. a chance of showers in the
morning, then showers likely with a chance of thunderstorms in
the afternoon. waves 1 to 2 feet. 
.sunday night...west winds 10 to 15 knots becoming northwest. a
chance of showers and thunderstorms in the evening. waves 1 to
2 feet. 
.monday...north winds 5 to 15 knots becoming southwest less than
10 knots. waves 2 feet or less. 
.tuesday...west winds 5 to 15 knots becoming southwest. waves
1 foot or less. 
.wednesday...southwest winds 10 to 15 knots becoming north. a
chance of showers and thunderstorms during the day, then a chance
of showers wednesday night. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 150738
glfle 
expires:202608151415;;220395

open lake forecast for lake erie
national weather service cleveland oh
338 am edt sat aug 15 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 warm front will lift across the region tonight into sunday as 
low pressure 29.90 inches moves east across the upper great lakes.
this low will push a cold front across lake erie as it moves east
into southern quebec. high pressure 30.10 inches will build across
the region monday and tuesday before the next cold front 
approaches from the west on wednesday.


lez165>167-151415-
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-
338 am edt sat aug 15 2026

.today...east winds 10 knots or less. a slight chance of showers
early this afternoon. waves 1 foot or less. 
.tonight...east winds 10 to 15 knots becoming southeast. a chance
of showers with a slight chance of thunderstorms in the evening,
then a chance of showers and thunderstorms after midnight. waves
1 to 3 feet. 
.sunday...south winds 10 to 15 knots becoming west. a chance of
showers. waves 1 to 3 feet. 
.sunday night...west winds 10 to 15 knots becoming northwest. a
chance of showers and thunderstorms in the evening, then a chance
of showers overnight. waves 2 to 3 feet. 
.monday...north winds 5 to 15 knots becoming northwest. waves
1 to 3 feet subsiding to 1 foot or less. 
.tuesday...west winds 10 knots or less becoming southwest 10 to
15 knots. waves 2 feet or less. 
.wednesday...southwest winds 15 to 20 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers wednesday night. waves 1 to 3 feet building to 2 to
4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 150738
glfle 
expires:202608151415;;220396

open lake forecast for lake erie
national weather service cleveland oh
338 am edt sat aug 15 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 warm front will lift across the region tonight into sunday as 
low pressure 29.90 inches moves east across the upper great lakes.
this low will push a cold front across lake erie as it moves east
into southern quebec. high pressure 30.10 inches will build across
the region monday and tuesday before the next cold front 
approaches from the west on wednesday.


lez061-168-169-151415-
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-
338 am edt sat aug 15 2026

.today...southeast winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast. a slight
chance of showers after midnight. a slight chance of showers and
thunderstorms late. waves 2 feet or less. 
.sunday...southeast winds 5 to 15 knots becoming southwest. a
chance of showers. waves 1 to 3 feet. 
.sunday night...west winds 5 to 15 knots becoming northwest. a
chance of showers. waves 1 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet. 
.tuesday...west winds 10 knots or less becoming south 10 to
15 knots. waves 2 feet or less. 
.wednesday...southwest winds 10 to 15 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers wednesday night. waves 1 to 3 feet building to 2 to
4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 151344
glflh 
expires:202608152145;;233620

open lake forecast for lake huron
national weather service detroit/pontiac mi
944 am edt sat aug 15 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...high pressure, 30.20 inches, currently centered over
northern lake huron will hold most of the day before sliding
southeast through the eastern lakes. the next low pressure system
will pass through the region tonight and sunday bringing the next
thunderstorm chances.


lhz361-152145-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
944 am edt sat aug 15 2026

.rest of today...east winds 5 to 10 knots increasing to 10 to
15 knots late in the afternoon. waves 2 feet or less. 
.tonight...southeast winds 10 to 15 knots. waves 2 to 4 feet. 
.sunday...south winds 5 to 10 knots veering to the west early in
the afternoon. a chance of showers. waves 2 to 4 feet. 
.sunday night...northwest winds 10 to 15 knots increasing to
15 to 20 knots by midnight...then decreasing to 10 to 15 knots
after midnight. waves 3 to 5 feet. 
.monday...northwest winds 5 to 10 knots. waves 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then veering
to the west . a chance of showers. rain showers likely by
midnight. waves 1 to 3 feet. 
.wednesday...north winds 5 to 10 knots increasing to 15 to
20 knots. showers likely early in the morning...then a chance of
showers until early evening. waves 1 to 3 feet building to 3 to
5 feet . 


$$

fzus63 kdtx 151344
glflh 
expires:202608152145;;233622

open lake forecast for lake huron
national weather service detroit/pontiac mi
944 am edt sat aug 15 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...high pressure, 30.20 inches, currently centered over
northern lake huron will hold most of the day before sliding
southeast through the eastern lakes. the next low pressure system
will pass through the region tonight and sunday bringing the next
thunderstorm chances.


lhz462>464-152145-
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-
944 am edt sat aug 15 2026

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


$$

fzus63 kdtx 151344
glflh 
expires:202608152145;;233621

open lake forecast for lake huron
national weather service detroit/pontiac mi
944 am edt sat aug 15 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...high pressure, 30.20 inches, currently centered over
northern lake huron will hold most of the day before sliding
southeast through the eastern lakes. the next low pressure system
will pass through the region tonight and sunday bringing the next
thunderstorm chances.


lhz362-363-152145-
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-
944 am edt sat aug 15 2026

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


$$

fzus63 kdtx 151344
glfsc 
expires:202608152145;;233624

lake st clair forecast
national weather service detroit/pontiac mi
944 am edt sat aug 15 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...high pressure, 30.20 inches, currently centered over
northern lake huron will hold most of the day before sliding
southeast through the eastern lakes. the next low pressure system
will pass through the region tonight and sunday bringing the next
thunderstorm chances.


lcz460-152145-
lake st clair-
944 am edt sat aug 15 2026

.rest of today...light and variable winds becoming southeast 5 to 10
knots in the afternoon. partly sunny late in the morning becoming
mostly cloudy. waves 2 feet or less.
.tonight...southeast winds 10 to 15 knots becoming south 5 to 10
knots early in the morning. mostly cloudy becoming partly cloudy. a
chance of light showers in the evening. waves 2 feet or less.
.sunday...southwest winds 5 to 10 knots veering to the west early in
the afternoon. partly sunny. a chance of showers and thunderstorms
early in the afternoon. waves 2 feet or less.
.sunday night...northwest winds 5 to 10 knots increasing to 10 to 15
knots in the late evening and overnight. partly cloudy. a chance of
showers and thunderstorms early in the evening. waves 2 feet or
less.
.monday...north winds 10 to 15 knots diminishing to 5 to 10 knots in
the afternoon...then veering to the northeast in the evening. mostly
clear in the morning then clearing. waves 2 feet or less.
.tuesday...southwest winds 10 to 15 knots. mostly clear. waves 2
feet or less.
.wednesday...northwest winds 15 to 20 knots. partly cloudy. showers
likely and a chance of thunderstorms. waves 2 feet or less.

$$

fzus63 kmkx 151322
glflm 
expires:202608152130;;233268

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
822 am cdt sat aug 15 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...

30.2 inch high pressure is centered along the ontario-quebec
border this morning, resulting in generally light easterly winds
across the open waters. the high will progress into the
northeastern united states tonight as a cold front approaches from
the northern great plains, resulting in a brief period of south-
southeasterly winds this afternoon and tonight. the 
aforementioned surface front will move across lake michigan early
sunday morning, with northwest winds becoming established by
sunday afternoon across the entirety of the lake. periods of
scattered showers and thunderstorms continue today into sunday
morning ahead of the front. severe weather is not anticipated. 

a new area of 30.1 inch high pressure will build in from the
northern great plains late sunday night into monday, bringing
light and variable winds to the waters through the majority of
monday and monday evening. a slow-moving cold front will approach
from the northern great plains tuesday into wednesday, bringing
increasing southwest winds and chances for thunderstorms. precise
timing details will continue to be refined over coming forecasts,
though it does appear that a few stronger storms could be possible
over the southern half of the waters tuesday afternoon & night.
winds will trend light and variable behind the front from
wednesday night through the end of next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-152130-
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-
822 am cdt sat aug 15 2026

sheboygan wi to pentwater mi south...

.rest of today...southeast winds 10 to 20 kt. scattered showers
with isolated thunderstorms. waves 3 to 5 ft. 
.tonight...southeast winds 10 to 15 kt becoming southwest 5 to
10 kt. slight chance of showers and thunderstorms overnight.
waves 2 to 4 ft subsiding to 1 to 2 ft. 
.sunday...west winds 10 to 20 kt becoming northwest 10 to 15 kt.
chance of showers in the morning. waves 1 to 2 ft. 
.sunday night...north winds 10 to 20 kt. waves 2 to 4 ft. 
.monday...north winds 10 to 15 kt becoming northwest 10 to 20 kt.
waves 2 to 4 ft. 
.monday night...south winds 10 to 15 kt becoming southwest. waves
1 to 2 ft building to 1 to 3 ft. 
.tuesday...southwest winds 10 to 20 kt. waves 2 to 4 ft. 
.wednesday...west winds 15 to 25 kt becoming north to 30 kt.
chance of showers and thunderstorms. waves 4 to 6 ft occasionally
to 8 ft.  

$$

fzus63 kmkx 151322
glflm 
expires:202608152130;;233267

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
822 am cdt sat aug 15 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...

30.2 inch high pressure is centered along the ontario-quebec
border this morning, resulting in generally light easterly winds
across the open waters. the high will progress into the
northeastern united states tonight as a cold front approaches from
the northern great plains, resulting in a brief period of south-
southeasterly winds this afternoon and tonight. the 
aforementioned surface front will move across lake michigan early
sunday morning, with northwest winds becoming established by
sunday afternoon across the entirety of the lake. periods of
scattered showers and thunderstorms continue today into sunday
morning ahead of the front. severe weather is not anticipated. 

a new area of 30.1 inch high pressure will build in from the
northern great plains late sunday night into monday, bringing
light and variable winds to the waters through the majority of
monday and monday evening. a slow-moving cold front will approach
from the northern great plains tuesday into wednesday, bringing
increasing southwest winds and chances for thunderstorms. precise
timing details will continue to be refined over coming forecasts,
though it does appear that a few stronger storms could be possible
over the southern half of the waters tuesday afternoon & night.
winds will trend light and variable behind the front from
wednesday night through the end of next week.


lmz261-362-364-366-563-565-567-868-152130-
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-
822 am cdt sat aug 15 2026

sheboygan wi to pentwater mi north...

.rest of today...east winds 10 to 20 kt. waves 3 to 5 ft. 
.tonight...east winds 10 to 20 kt veering to south 10 to 15 kt.
slight chance of showers and thunderstorms overnight. waves 1 to
3 ft subsiding to 1 to 2 ft. 
.sunday...west winds 10 to 15 kt becoming northwest 10 to 20 kt
late in the morning, then increasing to 15 to 25 kt early in the
afternoon becoming north to 30 kt late. chance of showers in the
morning. waves 1 to 2 ft building to 2 to 4 ft. 
.sunday night...north winds to 30 kt diminishing to 10 to 20 kt
overnight. waves 2 to 4 ft. 
.monday...northwest winds 10 to 15 kt backing to southwest 10 to
20 kt. waves 1 to 3 ft. 
.monday night...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 3 ft. 
.tuesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 2 to 4 ft. 
.wednesday...north winds 15 to 25 kt increasing to 30 kt. chance
of showers. waves 3 to 5 ft.  

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221027

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz266-152000-
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 am edt sat aug 15 2026

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

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221026

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz265-152000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt sat aug 15 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. waves building to 1 to 3 feet. 
.tonight...southeast winds 15 to 25 knots becoming south 10 to
20 knots after midnight, then veering west late. a chance of
showers and a slight chance of thunderstorms. waves subsiding to
calm to 2 feet. 
.sunday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.sunday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.monday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves calm to 2 feet. 
.monday night...south winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. waves calm to 2 feet. 
.tuesday...west winds 10 to 20 knots veering north. a chance of
showers. waves calm to 2 feet. 
.wednesday...north winds 15 to 25 knots becoming northwest 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221025

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz264-152000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt sat aug 15 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a chance of showers by mid afternoon. waves calm to 2 feet.
.tonight...east winds 10 to 20 knots veering southeast after
midnight, then becoming west 5 to 15 knots late. showers likely
and a slight chance of thunderstorms through midnight, then a
slight chance of showers after midnight. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots backing west late. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet. 
.monday night...southwest winds 10 to 20 knots. a chance of
showers. waves subsiding to calm to 2 feet. 
.tuesday...west winds 5 to 15 knots veering north. waves calm to
2 feet. 
.wednesday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221024

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz263-152000-
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 am edt sat aug 15 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots
late. a chance of showers. a slight chance of thunderstorms by
mid afternoon. waves calm to 2 feet. 
.tonight...east winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then backing west late. a slight chance
of thunderstorms through midnight. a chance of showers. waves
calm to 2 feet. 
.sunday...west winds 10 to 20 knots. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves subsiding to calm to 2 feet.
.tuesday...west winds 5 to 15 knots becoming north 10 to
20 knots. a chance of showers. waves calm to 2 feet. 
.wednesday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221023

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz162-152000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sat aug 15 2026 /301 am cdt sat aug 15 2026/

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 10 to 20 knots backing northeast in the
afternoon. a chance of showers. a slight chance of thunderstorms
by mid afternoon. waves calm to 2 feet. 
.tonight...northeast winds 5 to 15 knots backing north after
midnight, then backing west late. a chance of showers and a
slight chance of thunderstorms through midnight. waves calm to
2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots
late. waves calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.monday night...southwest winds 10 to 20 knots veering west after
midnight. a chance of showers. waves calm to 2 feet. 
.tuesday...west winds 5 to 15 knots veering north. a chance of
showers. waves calm to 2 feet. 
.wednesday...north winds 5 to 15 knots backing northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 150801
glfls 
expires:202608152000;;221028

open lake forecast for lake superior
national weather service marquette mi
401 am edt sat aug 15 2026

for waters beyond 5 nautical miles of shore on lake superior.

waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.synopsis...

30.2 inch high pressure just north and east of lake superior 
eventually gives way to a 29.9 inch low by tonight as the 
aforementioned high moves east towards new england. this low deepens 
to 29.7 inches as it reaches quebec sunday night. into monday, a 
30.1 inch high over the plains weakens to 30.0 inches as it slides 
generally south of the great lakes tuesday. meanwhile tuesday, a 
29.4 inch low over hudson bay extends a 29.8 inch trough over lake 
superior. wednesday into thursday morning, ridging of 30.1 inches 
moves over the upper great lakes from the plains.




lsz267-152000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt sat aug 15 2026

.early this morning...east winds 5 to 15 knots. waves calm to
2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots
late. waves calm to 2 feet. 
.tonight...southeast winds 10 to 20 knots veering south late. a
slight chance of showers through midnight, then showers likely
and a chance of thunderstorms after midnight. waves building to
1 to 3 feet. 
.sunday...west winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. a chance of showers and a slight chance of thunderstorms
through early afternoon. waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.tuesday...west winds 5 to 15 knots veering north. a chance of
showers. waves calm to 2 feet. 
.wednesday...north winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet,
then subsiding to calm to 2 feet. 

$$