fzus61 kbuf 200201
glflo 
expires:202608200900;;022395

open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt wed aug 19 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 averaging 30.1 inches over the upper great 
lakes tonight, will build across the lower great lakes, then into 
new england by friday night. the high will then move into the 
canadian maritimes saturday, while an elongated 29.7 inch low slowly 
makes its way from the central great lakes to western quebec 
saturday and sunday, then wobbles about western quebec through at 
least monday.


loz063>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1001 pm edt wed aug 19 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 200201
glflo 
expires:202608200900;;022394

open lake forecast for lake ontario
national weather service buffalo ny
1001 pm edt wed aug 19 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 averaging 30.1 inches over the upper great 
lakes tonight, will build across the lower great lakes, then into 
new england by friday night. the high will then move into the 
canadian maritimes saturday, while an elongated 29.7 inch low slowly 
makes its way from the central great lakes to western quebec 
saturday and sunday, then wobbles about western quebec through at 
least monday.


loz062-200900-
lake ontario open waters from the niagara river to hamlin beach-
1001 pm edt wed aug 19 2026

.overnight...north winds 5 to 15 knots becoming northwest.
waves 2 feet or less. 
.thursday...north winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.thursday night...west winds less than 10 knots becoming north.
waves 1 foot or less. 
.friday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.friday night...east winds 5 to 10 knots becoming southeast.
waves 2 feet or less. 
.saturday...southeast winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.sunday...west winds 10 to 15 knots. a chance of showers. waves
2 to 3 feet. 
.monday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200128
glfle 
expires:202608200815;;021584

open lake forecast for lake erie
national weather service cleveland oh
928 pm edt wed aug 19 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a cold front will settle south of lake erie this evening as 
high pressure 30.10 inches builds into the region through friday.
low pressure 29.90 inches moves into the great lakes region on 
saturday with a cold front crossing late saturday night into 
sunday.


lez162>164-200815-
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-
928 pm edt wed aug 19 2026

.rest of tonight...east winds 10 knots or less becoming
northeast. a slight chance of showers and thunderstorms late this
evening, then a chance of showers with a slight chance of
thunderstorms after midnight. waves 1 foot or less. 
.thursday...northeast winds 10 to 15 knots. a chance of showers
with a slight chance of thunderstorms early. waves 1 to 3 feet. 
.thursday night...east winds 5 to 10 knots becoming southeast.
waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...southeast winds 10 knots or less becoming east. waves
1 foot or less. 
.friday night...east winds 5 to 10 knots becoming southwest.
waves 1 foot or less. 
.saturday...southwest winds 5 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 2 feet or less. 
.sunday...northwest winds 10 to 15 knots. waves 1 to 2 feet. 
.monday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200128
glfle 
expires:202608200815;;021586

open lake forecast for lake erie
national weather service cleveland oh
928 pm edt wed aug 19 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a cold front will settle south of lake erie this evening as 
high pressure 30.10 inches builds into the region through friday.
low pressure 29.90 inches moves into the great lakes region on 
saturday with a cold front crossing late saturday night into 
sunday.


lez061-168-169-200815-
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-
928 pm edt wed aug 19 2026

.rest of tonight...northwest winds 5 to 10 knots becoming
northeast. a slight chance of showers late this evening. waves
1 to 3 feet. 
.thursday...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.thursday night...northeast winds 10 knots or less becoming east.
waves 2 feet or less. 
.friday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.friday night...northeast winds 5 to 10 knots becoming south.
waves 1 foot or less. 
.saturday...south winds 5 to 15 knots becoming west. showers with
a chance of thunderstorms. waves 1 to 3 feet. 
.sunday...northwest winds 10 to 15 knots. a chance of showers.
waves 1 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming west. waves 1 to
2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200128
glfle 
expires:202608200815;;021585

open lake forecast for lake erie
national weather service cleveland oh
928 pm edt wed aug 19 2026

for waters beyond five nautical miles of shore on lake erie

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

.synopsis...
a cold front will settle south of lake erie this evening as 
high pressure 30.10 inches builds into the region through friday.
low pressure 29.90 inches moves into the great lakes region on 
saturday with a cold front crossing late saturday night into 
sunday.


lez165>167-200815-
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-
928 pm edt wed aug 19 2026

.rest of tonight...north winds 10 knots or less becoming
northeast. a slight chance of showers and thunderstorms after
midnight. a slight chance of showers late. waves 2 feet or less. 
.thursday...east winds 10 to 15 knots becoming northeast. a
chance of showers with a slight chance of thunderstorms early,
then a slight chance of showers and thunderstorms late in the
morning. waves 1 to 3 feet. 
.thursday night...northeast winds 5 to 15 knots becoming east.
waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...southeast winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.friday night...east winds 5 to 10 knots becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms during the day,
then a chance of showers and thunderstorms saturday night. waves
1 to 3 feet. 
.sunday...northwest winds 10 to 15 knots. waves 2 to 3 feet. 
.monday...northwest winds 5 to 15 knots becoming south. waves
1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 200151
glfsc 
expires:202608201000;;022095

lake st clair forecast
national weather service detroit/pontiac mi
951 pm edt wed aug 19 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lcz460-201000-
lake st clair-
951 pm edt wed aug 19 2026

.rest of tonight...northeast winds 5 to 10 knots. partly cloudy.
waves 2 feet or less.
.thursday...northeast winds 5 to 10 knots. mostly sunny. waves 2
feet or less.
.thursday night...northeast winds 10 to 15 knots becoming east 5 to
10 knots in the late evening and overnight. clear. waves 2 feet or
less.
.friday...southeast winds 5 to 10 knots. mostly sunny. waves 2 feet
or less.
.friday night...southeast winds 5 to 10 knots. mostly clear. waves 2
feet or less.
.saturday...southwest winds 5 to 10 knots veering to the northwest
in the evening. mostly sunny becoming partly cloudy. a chance of
light showers. a chance of thunderstorms in the afternoon and
evening. waves 2 feet or less.
.sunday...north winds 10 to 15 knots. mostly clear. waves 2 feet or
less.
.monday...northeast winds 10 to 15 knots. mostly clear. waves 2 feet
or less.

$$

fzus63 kdtx 200149
glflh 
expires:202608201000;;022085

open lake forecast for lake huron
national weather service detroit/pontiac mi
949 pm edt wed aug 19 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lhz362-363-201000-
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-
949 pm edt wed aug 19 2026

.rest of tonight...light and variable winds becoming northwest
5 to 10 knots early in the morning. waves 2 feet or less. 
.thursday...northwest winds 5 to 10 knots early in the morning
becoming light and variable. waves 2 feet or less. 
.thursday night...east winds 5 to 10 knots veering to the
southeast after midnight. waves 2 feet or less. 
.friday...south winds 5 to 10 knots increasing to 10 to 15 knots
in the late morning and afternoon. waves 1 to 3 feet building to
3 to 5 feet early in the afternoon. 
.friday night...southeast winds 10 to 15 knots. a chance of
showers after midnight. waves 2 to 4 feet subsiding to 1 to
3 feet after midnight. 
.saturday...southwest winds 5 to 10 knots becoming west 10 to
15 knots late in the afternoon...then becoming northwest 15 to
20 knots late in the evening. showers likely. a chance of
thunderstorms. waves 1 to 3 feet building to 3 to 5 feet late in
the afternoon. 
.sunday...northwest winds 15 to 20 knots with gusts to around
30 knots increasing to 20 to 25 knots with gusts to 35 knot gales
early in the evening...then decreasing to 15 to 20 knots with
gusts to around 30 knots by midnight. waves 5 to 7 feet. waves
occasionally around 10 feet. 
.monday...northwest winds 10 to 15 knots. waves 3 to 5 feet
subsiding to 1 to 3 feet . 


$$

fzus63 kdtx 200149
glflh 
expires:202608201000;;022086

open lake forecast for lake huron
national weather service detroit/pontiac mi
949 pm edt wed aug 19 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lhz462>464-201000-
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-
949 pm edt wed aug 19 2026

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


$$

fzus63 kdtx 200149
glflh 
expires:202608201000;;022084

open lake forecast for lake huron
national weather service detroit/pontiac mi
949 pm edt wed aug 19 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, builds into the great
lakes through the end of the work week maintaining light winds. a
cold front then sweeps across the area friday into saturday,
bringing the next opportunity for showers and thunderstorms.


lhz361-201000-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
949 pm edt wed aug 19 2026

.rest of tonight...northwest winds 5 to 10 knots by midnight
becoming light and variable. waves 2 feet or less. 
.thursday...light and variable winds. waves 2 feet or less. 
.thursday night...southeast winds 5 to 10 knots becoming south
10 to 15 knots after midnight. waves 2 feet or less. 
.friday...south winds 10 to 15 knots. a chance of showers in the
afternoon. waves 1 to 3 feet building to 2 to 4 feet early in the
afternoon. 
.friday night...southeast winds 10 to 15 knots becoming south
5 to 10 knots in the late evening and overnight. a chance of
showers. waves 2 to 4 feet subsiding to 1 to 3 feet after
midnight. 
.saturday...southwest winds 5 to 10 knots veering to the west
late in the morning...then becoming northwest 15 to 20 knots late
in the afternoon. a chance of showers. a chance of thunderstorms
late in the afternoon. waves 1 to 3 feet building to 3 to 5 feet
late in the afternoon. 
.sunday...northwest winds 15 to 20 knots with gusts to around
30 knots increasing to 20 to 25 knots with gusts to 35 knot gales
early in the evening...then decreasing to 10 to 15 knots with
gusts to around 30 knots by midnight. waves 4 to 6 feet. waves
occasionally around 8 feet. 
.monday...northwest winds 10 to 15 knots becoming west 5 to
10 knots by midnight. waves 2 to 4 feet subsiding to 1 to 3 feet.


$$

fzus63 kmkx 200150
glflm 
expires:202608200945;;022089

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
850 pm cdt wed aug 19 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...

light to modest winds are expected tonight into thursday, as high
pressure around 30.0 inches tracks through the western great 
lakes region. as the high exits to the southeast later thursday 
into thursday night, south to southwest winds will develop. gusty 
southwest winds, as well as shower and thunderstorm chances, 
return friday into friday night, as low pressure around 29.8 
inches moves across the region and drags a cold front through. 
gusty winds will shift to the northwest later friday night into 
saturday after the front moves through. high pressure around 30.2 
inches moving toward the region later in the weekend may help 
maintain gusty north winds.


lmz080-669-671-673-675-777-779-870-872-874-876-878-200945-
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-
850 pm cdt wed aug 19 2026

sheboygan wi to pentwater mi south...

.rest of tonight...northeast winds 10 to 15 kt. waves 1 to 3 ft. 
.thursday...northeast winds 5 to 10 kt backing to northwest.
waves 1 to 2 ft. 
.thursday night...north winds 10 to 15 kt backing to south 10 to
20 kt. waves 1 to 3 ft. 
.friday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.friday night...southwest winds 10 to 20 kt becoming west 10 to
15 kt. chance of showers. waves 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft. 
.saturday night...north winds 10 to 20 kt. waves 1 to 3 ft
building to 3 to 5 ft. 
.sunday...north winds 15 to 25 kt increasing to 30 kt. waves 4 to
6 ft occasionally to 8 ft. 
.monday...northeast winds 10 to 15 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 200150
glflm 
expires:202608200945;;022088

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
850 pm cdt wed aug 19 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...

light to modest winds are expected tonight into thursday, as high
pressure around 30.0 inches tracks through the western great 
lakes region. as the high exits to the southeast later thursday 
into thursday night, south to southwest winds will develop. gusty 
southwest winds, as well as shower and thunderstorm chances, 
return friday into friday night, as low pressure around 29.8 
inches moves across the region and drags a cold front through. 
gusty winds will shift to the northwest later friday night into 
saturday after the front moves through. high pressure around 30.2 
inches moving toward the region later in the weekend may help 
maintain gusty north winds.


lmz261-362-364-366-563-565-567-868-200945-
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-
850 pm cdt wed aug 19 2026

sheboygan wi to pentwater mi north...

.rest of tonight...southeast winds 5 to 10 kt becoming east.
waves 1 to 2 ft. 
.thursday...southeast winds 5 to 10 kt becoming south late in the
morning, then increasing to 10 to 15 kt early in the afternoon
increasing to 10 to 20 kt late. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt. waves 2 to 4 ft. 
.friday...south winds 10 to 20 kt increasing to 15 to 25 kt.
chance of showers. waves 3 to 5 ft. 
.friday night...southwest winds 10 to 20 kt veering to northwest
10 to 15 kt. chance of showers. waves 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 30 kt in
the afternoon. waves 1 to 3 ft. 
.saturday night...north winds to 30 kt diminishing to 15 to
25 kt. waves 2 to 4 ft. 
.sunday...northwest winds to 30 kt becoming north gales to 35 kt.
waves 3 to 5 ft. 
.monday...north winds 10 to 20 kt becoming northwest. waves 1 to
2 ft.  

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022387

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt wed aug 19 2026 /901 pm cdt wed aug 19 2026/

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

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022388

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz263-200800-
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-
1001 pm edt wed aug 19 2026

.rest of tonight...south winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast in
the afternoon, then backing east late. a chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet. 
.thursday night...southeast winds 5 to 15 knots backing northeast
late. a chance of showers and a slight chance of thunderstorms
through midnight. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.friday night...southwest winds 5 to 15 knots veering west after
midnight. a slight chance of showers after midnight. waves calm
to 2 feet. 
.saturday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. 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 south 5 to
15 knots. waves calm to 2 feet. 
.monday...southeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022389

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz264-200800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 pm edt wed aug 19 2026

.rest of tonight...south winds less than 10 knots increasing to
5 to 15 knots late. waves calm to 2 feet. 
.thursday...southeast winds 5 to 15 knots diminishing to less
than 10 knots in the afternoon, then increasing to 5 to 15 knots
late. a slight chance of showers by mid afternoon. waves calm to
2 feet. 
.thursday night...southeast winds 5 to 15 knots. a slight chance
of thunderstorms through midnight. a chance of showers. waves
calm to 2 feet. 
.friday...north winds 5 to 15 knots backing west by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. a slight chance of
showers after midnight. waves calm to 2 feet. 
.saturday...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...northwest winds 10 to 20 knots veering north
after midnight. waves building to 1 to 3 feet. 
.sunday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots backing southeast. a chance
of showers. waves calm to 2 feet. 

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022390

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz265-200800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 pm edt wed aug 19 2026

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

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022391

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz266-200800-
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-
1001 pm edt wed aug 19 2026

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

$$

fzus63 kmqt 200201
glfls 
expires:202608200800;;022392

open lake forecast for lake superior
national weather service marquette mi
1000 pm edt wed aug 19 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...

30.0 inch high pressure remains over the upper great lakes tonight 
before expanding into the rest of the great lakes at 30.1 inches on 
thursday. a weakening shortwave low of 29.8 inches moves towards 
western lake superior on thursday, eventually bringing 29.9 inch 
troughing back over the lake thursday night. friday into this 
weekend, a low pressure of around 29.8 inches transits across 
northern ontario, reinforcing 29.9 inch troughing over lake superior 
friday into saturday morning. this is quickly followed by 30.1 inch 
ridging for the latter part of the weekend into early next week via 
a 30.2 inch parent high from canada that drops down into the ohio 
river valley by late monday.




lsz267-200800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 pm edt wed aug 19 2026

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

$$