fzus61 kbuf 212002
glflo 
expires:202608220300;;125853

open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 will drift east across the canadian 
maritimes tonight through 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 across western quebec through monday, then eject 
northeastward into labrador on tuesday while a 30.1 inch high builds 
eastward across the ohio valley.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri aug 21 2026

.tonight...northeast winds 5 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers and thunderstorms late. waves 2 to
4 feet subsiding to 1 foot or less. 
.saturday night...southeast winds 10 to 15 knots becoming south
15 to 20 knots. showers with a chance of thunderstorms. 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. 
.sunday night...west winds 15 to 20 knots. showers with a chance
of thunderstorms in the evening, then showers overnight. waves
3 to 6 feet. 
.monday...west winds 15 to 25 knots. showers with a chance of
thunderstorms. waves 3 to 6 feet. 
.tuesday...west winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.wednesday...southwest winds 10 knots or less becoming south
10 to 15 knots. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 212002
glflo 
expires:202608220300;;125852

open lake forecast for lake ontario
national weather service buffalo ny
402 pm 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 will drift east across the canadian 
maritimes tonight through 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 across western quebec through monday, then eject 
northeastward into labrador on tuesday while a 30.1 inch high builds 
eastward across the ohio valley.


loz062-220300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211944
glfle 
expires:202608220215;;125071

open lake forecast for lake erie
national weather service cleveland oh
344 pm 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 30.00 inches lingers over the lake this evening 
ahead of a cold front approaching from the west. pressure drops
steadily to 29.80 inches with the passage of the cold front
saturday late afternoon/evening. high pressure slowly builds back
in sunday and monday to 30.00 inches over lake erie on tuesday.



lez165>167-220215-
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-
344 pm edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211944
glfle 
expires:202608220215;;125070

open lake forecast for lake erie
national weather service cleveland oh
344 pm 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 30.00 inches lingers over the lake this evening 
ahead of a cold front approaching from the west. pressure drops
steadily to 29.80 inches with the passage of the cold front
saturday late afternoon/evening. high pressure slowly builds back
in sunday and monday to 30.00 inches over lake erie on tuesday.



lez162>164-220215-
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-
344 pm edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 211944
glfle 
expires:202608220215;;125072

open lake forecast for lake erie
national weather service cleveland oh
344 pm 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 30.00 inches lingers over the lake this evening 
ahead of a cold front approaching from the west. pressure drops
steadily to 29.80 inches with the passage of the cold front
saturday late afternoon/evening. high pressure slowly builds back
in sunday and monday to 30.00 inches over lake erie on tuesday.



lez061-168-169-220215-
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-
344 pm edt fri aug 21 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 211930
glfsc 
expires:202608220330;;124669

lake st clair forecast
national weather service detroit/pontiac mi
330 pm 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...a cold front will move across the great lakes tomorrow
morning which will veer wind direction to the northwest. showers
and thunderstorms are expected just ahead of and along the front.
post-frontal northwest flow leads to gusty winds through the day
on sunday.


lcz460-220330-
lake st clair-
330 pm edt fri aug 21 2026

.tonight...southeast winds 10 to 15 knots becoming south 5 to 10
knots after midnight. partly cloudy in the evening...then mostly
cloudy with scattered light showers and a chance of thunderstorms
after midnight. waves 2 feet or less.
.saturday...southwest winds 5 to 10 knots. mostly cloudy. scattered
light showers early in the morning. numerous showers in the late
morning and afternoon. a chance of thunderstorms 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. partly cloudy until
early morning then clearing. scattered light showers and a chance of
thunderstorms early in the evening. waves 2 feet or less.
.sunday...northwest winds 15 to 20 knots diminishing to 10 to 15
knots early in the afternoon. partly sunny. scattered light showers
early in the afternoon. waves 1 to 3 feet.
.sunday night...northwest winds 10 to 15 knots. mostly cloudy early
in the evening becoming partly cloudy. scattered light showers early
in the evening. waves 2 feet or less.
.monday...northwest winds 10 to 15 knots diminishing to 5 to 10
knots in the evening. sunny in the morning becoming mostly clear.
waves 2 feet or less.
.tuesday...south winds 5 to 10 knots. mostly clear. waves 2 feet or
less.
.wednesday...south winds 10 to 15 knots. partly cloudy. a chance of
showers. waves 2 feet or less.

$$

fzus63 kdtx 211930
glflh 
expires:202608220330;;124664

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm 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...a cold front will move across the great lakes tomorrow
morning which will veer wind direction to the northwest. showers
and thunderstorms are expected just ahead of and along the front.
post-frontal northwest flow leads to gusty winds through the day
on sunday.


lhz361>363-220330-
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-
330 pm edt fri aug 21 2026

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


$$

fzus63 kdtx 211930
glflh 
expires:202608220330;;124665

open lake forecast for lake huron
national weather service detroit/pontiac mi
330 pm 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...a cold front will move across the great lakes tomorrow
morning which will veer wind direction to the northwest. showers
and thunderstorms are expected just ahead of and along the front.
post-frontal northwest flow leads to gusty winds through the day
on sunday.


lhz462>464-220330-
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-
330 pm edt fri aug 21 2026

.tonight...southeast winds 10 to 15 knots. scattered showers
after midnight. a chance of waterspouts 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 early afternoon...then backing
to the southeast late in the afternoon. numerous 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...north winds 10 to 15 knots becoming northwest
15 to 20 knots in the late evening and overnight. a chance of
waterspouts in the evening. numerous showers and a chance of
thunderstorms in the evening...then scattered showers after
midnight. 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 increasing to 20 to
25 knots in the late morning and early afternoon...then
decreasing to 15 to 20 knots early in the afternoon. gusts to
30 knots. numerous showers in the morning...then numerous showers
and a chance of thunderstorms in the afternoon. waves 6 to
9 feet. waves occasionally around 12 feet. 
.sunday night...northwest winds 15 to 20 knots. gusts to 30 knots
early in the evening. numerous showers and a chance of
thunderstorms in the evening...then scattered showers after
midnight. waves 6 to 9 feet. waves occasionally around 12 feet. 
.monday...northwest winds 15 to 20 knots decreasing to 5 to
10 knots late in the afternoon. waves 3 to 5 feet subsiding to
1 to 3 feet late in the evening. 
.tuesday...west winds 5 to 10 knots veering to the northeast
early in the evening...then veering to the south by midnight.
waves 2 feet or less. 
.wednesday...southwest winds 5 to 10 knots becoming south 10 to
15 knots . a chance of showers . waves 1 to 3 feet. 


$$

fzus63 kmkx 212014
glflm 
expires:202608220300;;127317

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 pm 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. ongoing thunderstorms over the far southern 
open waters will vacate this afternoon, with more storm development 
possible into this evening. a few storms could be strong with 
gusty winds, and hail. the aforementioned 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.


lmz261-362-364-366-563-565-567-868-220300-
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-
313 pm cdt fri aug 21 2026

sheboygan wi to pentwater mi north...

.tonight...south winds 10 to 20 kt veering to north. chance of
showers and thunderstorms this evening, then chance of showers
and slight chance of thunderstorms overnight. waves 3 to 5 ft
subsiding to 1 to 3 ft. 
.saturday...north winds 10 to 20 kt becoming northwest to 30 kt.
chance of showers and thunderstorms in the afternoon. waves 3 to
5 ft. 
.saturday night...north winds to 30 kt becoming northwest 15 to
25 kt. 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 winds to 30 kt diminishing to 10 to 20 kt
overnight. waves 3 to 5 ft subsiding to 1 to 3 ft. 
.monday...northwest winds 10 to 20 kt. waves 1 to 2 ft. 
.monday night...southwest winds 10 to 20 kt diminishing to 5 to
10 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. 
.wednesday...southwest winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 3 to 5 ft.  

$$

fzus63 kmkx 212014
glflm 
expires:202608220300;;127318

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 pm 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. ongoing thunderstorms over the far southern 
open waters will vacate this afternoon, with more storm development 
possible into this evening. a few storms could be strong with 
gusty winds, and hail. the aforementioned 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.


lmz080-669-671-673-675-870-872-874-876-878-220300-
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 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-
313 pm cdt fri aug 21 2026

sheboygan wi to pentwater mi south to winthrop harbor il to south
haven mi...

.tonight...south winds 10 to 20 kt veering to northwest. chance
of showers and thunderstorms this evening, then chance of showers
and slight chance of thunderstorms overnight. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. slight chance of showers and thunderstorms in the
afternoon. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...north winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 5 to 8 ft occasionally to
10 ft. 
.sunday night...north winds 15 to 25 kt becoming northwest 10 to
15 kt overnight. waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft. 
.monday...north winds 10 to 15 kt. waves 1 to 2 ft. 
.monday night...east winds 5 to 10 kt veering to south. 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. 
.wednesday...southwest winds 15 to 25 kt. waves 3 to 5 ft.  

$$

fzus63 kmkx 212014
glflm 
expires:202608220300;;127319

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 pm 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. ongoing thunderstorms over the far southern 
open waters will vacate this afternoon, with more storm development 
possible into this evening. a few storms could be strong with 
gusty winds, and hail. the aforementioned 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.


lmz777-779-220300-
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-
313 pm cdt fri aug 21 2026

winthrop harbor il to south haven mi south...

...severe thunderstorm watch 610 in effect until 10 pm cdt this
evening...

.tonight...south winds 10 to 20 kt veering to northwest. chance
of showers and thunderstorms this evening, then chance of showers
and slight chance of thunderstorms overnight. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. slight chance of showers and thunderstorms in the
afternoon. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...north winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 5 to 8 ft occasionally to
10 ft. 
.sunday night...north winds 15 to 25 kt becoming northwest 10 to
15 kt overnight. waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft. 
.monday...north winds 10 to 15 kt. waves 1 to 2 ft. 
.monday night...east winds 5 to 10 kt veering to south. 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. 
.wednesday...southwest winds 15 to 25 kt. waves 3 to 5 ft.  

$$

fzus63 kmkx 211906
glflm 
expires:202608220315;;123646

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
206 pm 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. ongoing thunderstorms over the far southern 
open waters will vacate this afternoon, with more storm development 
possible into this evening. a few storms could be strong with 
gusty winds, and hail. the aforementioned 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.


lmz080-669-671-673-675-777-779-870-872-874-876-878-220315-
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-
206 pm cdt fri aug 21 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 10 to 20 kt veering to northwest. chance
of showers and thunderstorms this evening, then chance of showers
and slight chance of thunderstorms overnight. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt becoming north 15 to
25 kt. slight chance of showers and thunderstorms in the
afternoon. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...north winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...north winds to 30 kt. waves 5 to 8 ft occasionally to
10 ft. 
.sunday night...north winds 15 to 25 kt becoming northwest 10 to
15 kt overnight. waves 4 to 6 ft occasionally to 8 ft subsiding
to 2 to 4 ft. 
.monday...north winds 10 to 15 kt. waves 1 to 2 ft. 
.monday night...east winds 5 to 10 kt veering to south. 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. 
.wednesday...southwest winds 15 to 25 kt. waves 3 to 5 ft.  

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125718

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz264-220800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt fri aug 21 2026

.late this afternoon...northwest winds less than 10 knots. waves
calm to 2 feet. 
.tonight...west winds 5 to 15 knots veering northwest late. waves
calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.saturday night...north winds 10 to 20 knots increasing to 15 to
25 knots late. waves building to 2 to 4 feet. 
.sunday...north winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.monday...northwest winds less than 10 knots becoming west 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.tuesday...south winds 5 to 15 knots veering southwest. showers
likely. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125719

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz265-220800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt fri aug 21 2026

.late this afternoon...northwest winds 10 to 20 knots. a slight
chance of showers and thunderstorms. 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 6 feet occasionally to
8 feet. 
.saturday night...northwest winds 20 to 30 knots veering north
after midnight. waves subsiding to 3 to 6 feet occasionally to
8 feet. 
.sunday...north winds 20 to 30 knots. waves building to 4 to
7 feet occasionally to 9 feet, then subsiding 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...northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.tuesday...southeast winds 5 to 15 knots becoming southwest 15 to
25 knots. a chance of showers, then showers likely. waves calm to
2 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest 10 to
20 knots. a chance of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125720

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz266-220800-
lake superior east of a line from manitou island to marquette mi
and west of a line from grand marais mi to the us/canadian border
beyond 5nm from shore-
401 pm edt fri aug 21 2026

.late this afternoon...northwest winds 5 to 15 knots. a chance of
showers and thunderstorms. 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 and
thunderstorms through midnight. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. waves building to 4 to 7 feet
occasionally to 9 feet. 
.saturday night...northwest winds 20 to 30 knots veering north
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 building to 5 to 8 feet occasionally to 10 feet,
then subsiding 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 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.monday night...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.tuesday...south winds 10 to 20 knots increasing to 15 to
25 knots. showers likely. waves building to 1 to 3 feet. 
.wednesday...west winds 10 to 20 knots veering northwest. a
chance of showers. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125721

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz267-220800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt fri aug 21 2026

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

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125716

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt fri aug 21 2026 /301 pm cdt fri aug 21 2026/

.late this afternoon...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...west winds 5 to 15 knots becoming northwest 10 to
20 knots late. a slight chance of showers and thunderstorms.
waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots backing west late.
waves calm to 2 feet. 
.saturday night...north winds 10 to 20 knots. waves calm to
2 feet. 
.sunday...north winds 5 to 15 knots veering south by mid
afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots becoming north less
than 10 knots after midnight. waves calm to 2 feet. 
.monday...north winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots becoming south less than
10 knots after midnight. waves calm to 2 feet. 
.tuesday...south winds 5 to 15 knots veering west. a chance of
showers and thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202608220800;;125717

open lake forecast for lake superior
national weather service marquette mi
400 pm 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. 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 early wednesday morning. 




lsz263-220800-
lake superior from saxon harbor wi to upper entrance to portage
canal mi 5nm off shore to the us/canadian border including isle
royale national park-
401 pm edt fri aug 21 2026

.late this afternoon...west winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southwest winds 5 to 15 knots veering west after
midnight, then becoming northwest 10 to 20 knots late. a slight
chance of showers and thunderstorms. 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. waves building to
1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. waves building to 2 to 4 feet, then subsiding
to calm to 2 feet. 
.sunday night...west winds 5 to 15 knots veering northwest after
midnight. waves calm to 2 feet. 
.monday...northwest winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. waves calm to 2 feet. 
.monday night...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. a chance of thunderstorms. showers
likely. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$