fzus61 kbuf 211402
glflo 
expires:202608212100;;109954

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt fri aug 21 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 30.1 inch high over southern quebec will slide across new england 
today, then into the canadian maritimes saturday. an elongated 29.7 
inch low will slowly make its way from the central great lakes to 
western quebec saturday and sunday, while pushing its associated 
warm and cold fronts across the lake between saturday night and 
sunday morning. the low will wobble about western quebec through 
monday, then wil eject northeastward into labrador on tuesday while 
a 30.1 inch high builds eastward across the ohio valley.


loz063>065-212100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 211402
glflo 
expires:202608212100;;109953

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt fri aug 21 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 30.1 inch high over southern quebec will slide across new england 
today, then into the canadian maritimes saturday. an elongated 29.7 
inch low will slowly make its way from the central great lakes to 
western quebec saturday and sunday, while pushing its associated 
warm and cold fronts across the lake between saturday night and 
sunday morning. the low will wobble about western quebec through 
monday, then wil eject northeastward into labrador on tuesday while 
a 30.1 inch high builds eastward across the ohio valley.


loz062-212100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt fri aug 21 2026

.this afternoon...east winds 10 knots or less. waves 1 foot or
less. 
.tonight...east winds around 10 knots becoming southeast. waves
1 to 2 feet. 
.saturday...southeast winds 5 to 10 knots becoming east. a chance
of showers and thunderstorms in the afternoon. waves 1 foot or
less. 
.saturday night...southeast winds 5 to 10 knots becoming
southwest. showers with a chance of thunderstorms. waves 1 to
2 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
showers with a chance of thunderstorms. waves 1 to 3 feet
building to 3 to 5 feet, then subsiding to 2 to 4 feet. 
.monday...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers. waves 2 to 4 feet. 
.tuesday...west winds 5 to 15 knots becoming southwest. waves
1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211320
glfle 
expires:202608212015;;108937

open lake forecast for lake erie
national weather service cleveland oh
920 am edt fri aug 21 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 30.10 inches lingers over the region today. low 
pressure 29.90 inches moves into the great lakes region on 
saturday. the low will drag a cold front across the lake saturday 
night into sunday. high pressure 30.00 inches returns for the 
start of next week.


lez061-168-169-212015-
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-
920 am edt fri aug 21 2026

.this afternoon...southeast winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.tonight...northeast winds 5 to 15 knots becoming south. waves
2 feet or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers and thunderstorms in the afternoon. waves
2 feet or less. 
.saturday night...south winds 5 to 15 knots becoming west 15 to
20 knots. showers with thunderstorms likely in the evening, then
showers with a chance of thunderstorms overnight. waves 1 to
3 feet building to 2 to 4 feet. 
.sunday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. showers likely with a chance of thunderstorms during
the day, then showers likely sunday night. waves 3 to 5 feet
subsiding to 2 to 3 feet. 
.monday...west winds 10 to 15 knots diminishing to 5 to 10 knots.
waves 1 to 3 feet. 
.tuesday...west winds 5 to 10 knots becoming south. waves around
1 foot. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211320
glfle 
expires:202608212015;;108935

open lake forecast for lake erie
national weather service cleveland oh
920 am edt fri aug 21 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 30.10 inches lingers over the region today. low 
pressure 29.90 inches moves into the great lakes region on 
saturday. the low will drag a cold front across the lake saturday 
night into sunday. high pressure 30.00 inches returns for the 
start of next week.


lez162>164-212015-
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-
920 am edt fri aug 21 2026

.this afternoon...southeast winds 5 to 10 knots becoming east.
waves 1 foot or less. 
.tonight...east winds 5 to 10 knots becoming south. a slight
chance of showers and thunderstorms. a slight chance of showers
late. waves 1 foot or less. 
.saturday...southwest winds 5 to 10 knots. showers and
thunderstorms likely in the afternoon. waves 1 foot or less. 
.saturday night...west winds 10 to 15 knots becoming northwest
15 to 20 knots. showers and thunderstorms in the evening, then a
chance of showers overnight. waves 1 to 3 feet. 
.sunday...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers during the day. waves 1 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.tuesday...west winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211320
glfle 
expires:202608212015;;108936

open lake forecast for lake erie
national weather service cleveland oh
920 am edt fri aug 21 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 30.10 inches lingers over the region today. low 
pressure 29.90 inches moves into the great lakes region on 
saturday. the low will drag a cold front across the lake saturday 
night into sunday. high pressure 30.00 inches returns for the 
start of next week.


lez165>167-212015-
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-
920 am edt fri aug 21 2026

.this afternoon...southeast winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming south. a slight
chance of showers and thunderstorms after midnight. a slight
chance of showers late. waves 2 feet or less. 
.saturday...south winds 5 to 15 knots becoming southwest. a
chance of showers and thunderstorms in the afternoon. waves
2 feet or less. 
.saturday night...west 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. 
.sunday...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. showers likely during the day, then a chance of showers
sunday night. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.monday...northwest winds 5 to 15 knots becoming west. waves 1 to
3 feet. 
.tuesday...west winds 5 to 10 knots becoming south. waves 2 feet
or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 211358
glflh 
expires:202608212200;;109715

open lake forecast for lake huron
national weather service detroit/pontiac mi
958 am edt fri aug 21 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, 30.00 inches, maintains influence
across the central and eastern great lakes today. the next low
pressure system then arrives saturday, dragging a cold front
across the area and increasing shower and thunderstorm chances.
post-frontal northwest flow leads to gusty winds sunday.


lhz361>363-212200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
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-
958 am edt fri aug 21 2026

.rest of today...southeast winds 10 to 15 knots. a chance of
showers in the afternoon. waves 1 to 3 feet building to 3 to
5 feet in the afternoon. 
.tonight...southeast winds 10 to 15 knots. a chance of showers. a
chance of waterspouts after midnight. waves 3 to 5 feet. 
.saturday...southwest winds 5 to 10 knots veering to the west
early in the afternoon. a chance of waterspouts in the morning. a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet
early in the afternoon. 
.saturday night...northwest winds 10 to 15 knots increasing to
15 to 20 knots in the late evening and overnight. a chance of
showers. waves 4 to 6 feet. 
.sunday...northwest winds 20 to 25 knots decreasing to 15 to
20 knots late in the evening. gusts to 30 knots. a chance of
showers in the morning. a chance of waterspouts in the morning.
waves 6 to 9 feet. waves occasionally around 12 feet. 
.monday...northwest winds 15 to 20 knots decreasing to 5 to
10 knots. waves 3 to 5 feet. 
.tuesday...west winds 5 to 10 knots backing to the south . waves
1 to 3 feet. 


$$

fzus63 kdtx 211358
glflh 
expires:202608212200;;109716

open lake forecast for lake huron
national weather service detroit/pontiac mi
958 am edt fri aug 21 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, 30.00 inches, maintains influence
across the central and eastern great lakes today. the next low
pressure system then arrives saturday, dragging a cold front
across the area and increasing shower and thunderstorm chances.
post-frontal northwest flow leads to gusty winds sunday.


lhz462>464-212200-
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-
958 am edt fri aug 21 2026

.rest of today...southeast winds 5 to 10 knots. waves 1 to
3 feet. 
.tonight...southeast winds 10 to 15 knots. a chance of showers
after midnight. waves 1 to 3 feet building to 2 to 4 feet after
midnight. 
.saturday...south winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and afternoon. a chance of showers
in the morning...then showers and a chance of thunderstorms in
the afternoon. a chance of waterspouts. waves 1 to 3 feet. 
.saturday night...northwest winds 5 to 10 knots increasing to
15 to 20 knots in the late evening and overnight. showers likely.
waves 1 to 3 feet building to 5 to 7 feet in the late evening and
overnight. waves occasionally around 10 feet. 
.sunday...northwest winds 15 to 20 knots with gusts to around
30 knots increasing to 20 to 25 knots with gusts to around
30 knots late in the morning...then decreasing to 15 to 20 knots
with gusts to around 30 knots late in the afternoon. a chance of
waterspouts. showers likely in the morning. a chance of showers.
waves 6 to 9 feet. waves occasionally around 12 feet. 
.monday...northwest winds 15 to 20 knots decreasing to 5 to
10 knots. a chance of showers early in the morning. waves 3 to
5 feet subsiding to 1 to 3 feet by midnight. 
.tuesday...west winds 5 to 10 knots backing to the south early in
the evening...then increasing to 10 to 15 knots by midnight.
waves 2 feet or less. 


$$

fzus63 kdtx 211358
glfsc 
expires:202608212200;;109718

lake st clair forecast
national weather service detroit/pontiac mi
958 am edt fri aug 21 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, 30.00 inches, maintains influence
across the central and eastern great lakes today. the next low
pressure system then arrives saturday, dragging a cold front
across the area and increasing shower and thunderstorm chances.
post-frontal northwest flow leads to gusty winds sunday.


lcz460-212200-
lake st clair-
958 am edt fri aug 21 2026

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

$$

fzus63 kmkx 211230
glflm 
expires:202608212100;;107326

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
730 am cdt fri aug 21 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz261-362-364-366-563-565-567-868-212100-
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-
730 am cdt fri aug 21 2026

sheboygan wi to pentwater mi north...

.rest of today...south winds 10 to 20 kt increasing to 15 to
25 kt. chance of showers and slight chance of thunderstorms this
morning, then chance of showers and thunderstorms this afternoon.
waves 3 to 5 ft. 
.tonight...south winds 15 to 25 kt becoming southwest 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight becoming north 10 to 20 kt late. chance of showers and
thunderstorms in the evening, then chance of showers and slight
chance of thunderstorms overnight. waves 3 to 5 ft subsiding to
2 to 4 ft. 
.saturday...north winds 10 to 20 kt increasing to 30 kt. waves
2 to 4 ft. 
.saturday night...north winds to 30 kt diminishing to 15 to
25 kt. chance of showers in the evening. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 6 ft occasionally to
8 ft. 
.sunday night...north gales to 35 kt diminishing to 10 to 20 kt.
waves 3 to 5 ft subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 2 ft. 
.tuesday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$

fzus63 kmkx 211230
glflm 
expires:202608212100;;107327

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
730 am cdt fri aug 21 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...

south to southwest winds will increase today as a low pressure
trough of 29.8 inches approaches southern wisconsin from the 
minnesota arrowhead. thunderstorms are expected at times today
through tonight. the trough will cross lake michigan from north 
to south tonight and bring a wind shift to the northwest. then look
for gusty northerly winds to develop along a cold front that will
track from north to south down lake michigan saturday evening. a 
few thunderstorms are possible along this front. northerly winds
will persist through sunday as low pressure around 29.6 inches
tracks from lower michigan to ontario. variable winds are 
expected for monday and tuesday as high pressure of 30.1 inches 
crosses the upper great lakes.


lmz080-669-671-673-675-777-779-870-872-874-876-878-212100-
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-
730 am cdt fri aug 21 2026

sheboygan wi to pentwater mi south...

.rest of today...south winds 10 to 20 kt. slight chance of
showers this morning, then chance of showers and thunderstorms
this afternoon. waves 2 to 4 ft. 
.tonight...south winds 10 to 20 kt veering to northwest. chance
of showers and thunderstorms in the evening, then chance of
showers and slight chance of thunderstorms overnight. waves 2 to
4 ft subsiding to 1 to 3 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. waves 3 to 5 ft. 
.saturday night...north winds 15 to 25 kt. waves 3 to 5 ft
building to 4 to 6 ft occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 4 to 7 ft occasionally to
9 ft. 
.sunday night...north winds 15 to 25 kt diminishing to 10 to
15 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.monday...northwest winds 10 to 20 kt becoming north. waves 1 to
2 ft. 
.tuesday...south winds 10 to 20 kt increasing to 15 to 25 kt.
waves 1 to 3 ft building to 2 to 4 ft.  

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109905

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz265-212000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am edt fri aug 21 2026

.rest of today...south winds 10 to 20 knots veering northwest
late. a chance of showers. a slight chance of thunderstorms by
mid afternoon. waves calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots backing west after
midnight, then increasing to 15 to 25 knots late. waves calm to
2 feet. 
.saturday...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. 
.saturday night...northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet. 
.sunday...north winds 15 to 25 knots. waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet. 
.sunday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 
.tuesday...southeast winds 10 to 20 knots becoming south 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109906

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz266-212000-
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 am edt fri aug 21 2026

.rest of today...south winds 10 to 20 knots diminishing to 5 to
15 knots late. a chance of showers. a slight chance of
thunderstorms by mid afternoon. waves 1 to 3 feet subsiding to
calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a slight chance of showers through
midnight. patchy fog after midnight. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. patchy dense fog through early
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...north winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...north winds 20 to 30 knots backing northwest by mid
afternoon. waves subsiding to 3 to 5 feet occasionally to 7 feet.
.sunday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...northwest winds 5 to 15 knots backing southwest. waves
calm to 2 feet. 
.tuesday...south winds 10 to 20 knots increasing to 15 to
25 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109907

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz267-212000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am edt fri aug 21 2026

.rest of today...south winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. a chance of showers by late morning. a
slight chance of thunderstorms. showers likely by mid afternoon.
waves 1 to 3 feet building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.tonight...south winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms through midnight. patchy fog. waves calm to
2 feet. 
.saturday...northwest winds 10 to 20 knots increasing to 15 to
25 knots late. patchy dense fog through early afternoon. waves
building to 2 to 4 feet. 
.saturday night...north winds 20 to 30 knots. waves building to
3 to 5 feet occasionally to 7 feet. 
.sunday...north winds 20 to 30 knots backing northwest by mid
afternoon. waves building to 3 to 6 feet occasionally to 8 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves subsiding to calm to 2 feet. 
.tuesday...southeast winds 5 to 15 knots becoming south 10 to
20 knots. a chance of showers. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109902

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt fri aug 21 2026 /900 am cdt fri aug 21 2026/

.rest of today...north winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest after
midnight, then increasing to 10 to 20 knots late. waves calm to
2 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.sunday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.sunday night...southeast winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering west. a chance of
showers. waves calm to 2 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109903

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz263-212000-
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 am edt fri aug 21 2026

.rest of today...north winds 5 to 15 knots backing west late.
waves calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots veering northwest late.
a slight chance of showers after midnight. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. waves calm to
2 feet. 
.saturday night...north winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.sunday...north winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming west 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 211401
glfls 
expires:202608212000;;109904

open lake forecast for lake superior
national weather service marquette mi
1000 am edt fri aug 21 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...

a 29.9 inch low moves over lake superior today. with reinforcing 
troughing from northern ontario of around 29.9 inches dropping in 
through saturday morning, the low deepens to 29.8 inches over 
eastern lake superior tonight. this is 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 the canadian prairies that drops down into the 
ohio river valley by late monday, weakening to 30.1 inches as it 
does so. a 29.7 inch low over the canadian prairies monday night 
then drops southeast towards lake superior, arriving on wednesday. 




lsz264-212000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 am edt fri aug 21 2026

.rest of today...south winds less than 10 knots becoming north
5 to 15 knots in the afternoon, then backing northwest late. a
slight chance of showers by mid afternoon. waves 1 to 3 feet
subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northwest late.
patchy fog after midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves building to
1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. waves subsiding to 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 backing south. waves calm to
2 feet. 
.tuesday...south winds 5 to 15 knots becoming southwest 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$