fzus61 kbuf 190802
glflo 
expires:202608191500;;980641

open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 cold front will cross the lake today. behind the 
front, high pressure averaging 30.1 inches will build from the upper 
great lakes thursday to 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.


loz062-191500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt wed aug 19 2026

.today...southwest winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms this morning, then a chance
of showers early this afternoon. waves 1 to 2 feet. 
.tonight...northwest winds 5 to 10 knots. waves 2 feet or less. 
.thursday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 
.thursday night...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.friday...east winds 5 to 10 knots becoming southeast. waves
2 feet or less. 
.saturday...southeast winds 5 to 15 knots becoming southwest. a
chance of showers and thunderstorms during the day, then showers
likely with a chance of thunderstorms saturday night. waves 1 to
2 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of showers. waves 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 190802
glflo 
expires:202608191500;;980642

open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 cold front will cross the lake today. behind the 
front, high pressure averaging 30.1 inches will build from the upper 
great lakes thursday to 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.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed aug 19 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190827
glfle 
expires:202608191430;;982220

open lake forecast for lake erie
national weather service cleveland oh
427 am 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 sweep across lake erie today followed by high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday night into 
sunday.


lez061-168-169-191430-
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-
427 am edt wed aug 19 2026

.today...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of waterspouts through early afternoon. a
chance of showers with a slight chance of thunderstorms early,
then showers likely with a slight chance of thunderstorms late
this morning. a chance of showers with a slight chance of
thunderstorms early this afternoon. waves 2 to 4 feet. 
.tonight...west winds 5 to 10 knots becoming northeast. waves
1 to 3 feet. 
.thursday...northeast winds 10 knots or less. waves 1 foot or
less. 
.thursday night...northeast winds less than 10 knots becoming
east. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 15 knots becoming west. showers with
a chance of thunderstorms. waves 2 feet or less. 
.sunday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of showers. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190827
glfle 
expires:202608191430;;982219

open lake forecast for lake erie
national weather service cleveland oh
427 am 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 sweep across lake erie today followed by high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday night into 
sunday.


lez165>167-191430-
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-
427 am edt wed aug 19 2026

.today...west winds 15 to 20 knots diminishing to 5 to 10 knots.
a chance of waterspouts through early afternoon. a chance of
showers with a slight chance of thunderstorms this morning, then
a slight chance of showers and thunderstorms early this
afternoon. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 10 knots becoming east. a slight
chance of showers from late evening on. waves 2 feet or less. 
.thursday...east winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.thursday night...northeast winds 5 to 10 knots becoming east.
waves 1 foot or less. 
.friday...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. waves 2 feet or
less. 
.sunday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 190827
glfle 
expires:202608191430;;982218

open lake forecast for lake erie
national weather service cleveland oh
427 am 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 sweep across lake erie today followed by high 
pressure 30.10 inches building into the region thursday through 
friday. low pressure 29.90 inches moves into the great lake on 
saturday with a cold front crossing late saturday night into 
sunday.


lez162>164-191430-
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-
427 am edt wed aug 19 2026

.today...west winds 15 to 20 knots diminishing to 10 knots or
less. a chance of waterspouts early. a chance of showers with a
slight chance of thunderstorms early. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming east. a
slight chance of showers and thunderstorms early, then a chance
of showers with a slight chance of thunderstorms late in the
evening. a chance of showers after midnight. waves 1 foot or
less. 
.thursday...east winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.thursday night...east winds 5 to 10 knots becoming southeast.
waves 1 foot or less. 
.friday...southeast winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming northwest.
showers likely with a chance of thunderstorms during the day.
waves 2 feet or less. 
.sunday...northwest winds 10 to 15 knots. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 190741
glfsc 
expires:202608191545;;979951

lake st clair forecast
national weather service detroit/pontiac mi
341 am 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 in tonight and
thursday providing light winds. showers and thunderstorm chances
increase friday evening and especially saturday ahead of the next
cold front.


lcz460-191545-
lake st clair-
341 am edt wed aug 19 2026

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

$$

fzus63 kdtx 190741
glflh 
expires:202608191545;;979936

open lake forecast for lake huron
national weather service detroit/pontiac mi
341 am 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 in tonight and
thursday providing light winds. showers and thunderstorm chances
increase friday evening and especially saturday ahead of the next
cold front.


lhz361-191545-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
341 am edt wed aug 19 2026

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


$$

fzus63 kdtx 190741
glflh 
expires:202608191545;;979937

open lake forecast for lake huron
national weather service detroit/pontiac mi
341 am 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 in tonight and
thursday providing light winds. showers and thunderstorm chances
increase friday evening and especially saturday ahead of the next
cold front.


lhz362-363-191545-
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-
341 am edt wed aug 19 2026

.today...northwest winds 5 to 10 knots until late afternoon
becoming light and variable. waves 1 to 3 feet. 
.tonight...north winds 5 to 10 knots in the evening becoming
light and variable...then becoming north 5 to 10 knots early in
the morning. waves 2 feet or less. 
.thursday...light and variable winds. 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 10 to 15 knots. a chance of showers late in
the afternoon. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...southwest winds 5 to 10 knots becoming west 10 to
15 knots early in the evening...then becoming northwest 15 to
20 knots by midnight. showers likely early in the morning. a
chance of thunderstorms in the late morning and early afternoon...
then a chance of showers . waves 1 to 3 feet building to 3 to
5 feet . 
.sunday...northwest winds 15 to 20 knots. gusts to 30 knots .
waves 5 to 7 feet. waves occasionally around 10 feet. 


$$

fzus63 kdtx 190741
glflh 
expires:202608191545;;979938

open lake forecast for lake huron
national weather service detroit/pontiac mi
341 am 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 in tonight and
thursday providing light winds. showers and thunderstorm chances
increase friday evening and especially saturday ahead of the next
cold front.


lhz462>464-191545-
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-
341 am edt wed aug 19 2026

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


$$

fzus63 kmkx 190753
glflm 
expires:202608191515;;980319

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
253 am 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...

a cold front continues to slowly work its way southward down lake
michigan through this morning. behind this front expect light 
north-northwesterly winds eventually become more variable as high
pressure around 30.0 inches tracks through the western great 
lakes today through thursday. then as the high pressure exits, 
southwesterly winds and thunderstorm chances return later friday 
as another system drags another cold front across the upper great 
lakes region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-191515-
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-
253 am cdt wed aug 19 2026

sheboygan wi to pentwater mi south...

.today...north winds 5 to 10 kt increasing to 10 to 15 kt. waves
1 to 3 ft subsiding to 1 to 2 ft. 
.tonight...northeast winds 10 to 15 kt becoming east 5 to 10 kt.
waves 1 to 2 ft. 
.thursday...southeast winds 5 to 10 kt becoming south late in the
morning, then becoming south 10 to 15 kt early in the afternoon
increasing to 10 to 20 kt late. waves 1 ft or less building to
1 to 3 ft. 
.thursday night...south winds 10 to 20 kt. waves 1 to 3 ft. 
.friday...southwest winds 10 to 20 kt becoming south to 30 kt in
the afternoon. chance of showers. waves 3 to 5 ft. 
.friday night...southwest winds 15 to 25 kt becoming west 10 to
20 kt. chance of showers. waves 3 to 5 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 2 to 4 ft. 
.sunday...north winds 15 to 25 kt increasing to 30 kt. waves 4 to
6 ft occasionally to 8 ft.  

$$

fzus63 kmkx 190753
glflm 
expires:202608191515;;980318

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
253 am 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...

a cold front continues to slowly work its way southward down lake
michigan through this morning. behind this front expect light 
north-northwesterly winds eventually become more variable as high
pressure around 30.0 inches tracks through the western great 
lakes today through thursday. then as the high pressure exits, 
southwesterly winds and thunderstorm chances return later friday 
as another system drags another cold front across the upper great 
lakes region.


lmz261-362-364-366-563-565-567-868-191515-
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-
253 am cdt wed aug 19 2026

sheboygan wi to pentwater mi north...

.today...northwest winds 5 to 10 kt increasing to 10 to 15 kt
late this morning, then becoming west early this afternoon
becoming southwest 10 to 20 kt late. waves 1 to 2 ft. 
.tonight...south winds 10 to 15 kt diminishing to 5 to 10 kt.
waves 1 to 2 ft. 
.thursday...southwest winds 5 to 10 kt becoming south 10 to
20 kt. waves 1 ft or less building to 1 to 3 ft. 
.thursday night...south winds 10 to 20 kt. waves 2 to 4 ft. 
.friday...southwest winds 15 to 25 kt increasing to 30 kt.
showers likely in the morning, then chance of showers in the
afternoon. waves 3 to 5 ft. 
.friday night...southwest winds 15 to 25 kt veering to northwest
10 to 20 kt. chance of showers. waves 3 to 5 ft subsiding to 2 to
4 ft. 
.saturday...northwest winds 15 to 25 kt becoming north to 30 kt.
waves 1 to 3 ft. 
.sunday...northwest winds to 30 kt becoming north gales to 35 kt.
waves 3 to 5 ft.  

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980515

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz267-192000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt wed aug 19 2026

.early this morning...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. waves calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots backing west after
midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east late. a slight
chance of showers by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a slight chance of showers through
midnight, then showers likely after midnight. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots. showers likely through
early afternoon. a chance of showers by mid afternoon. waves calm
to 2 feet. 
.friday night...southeast 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. waves building to 2 to 4 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980512

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz264-192000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt wed aug 19 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest late.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds less than 10 knots increasing to 5 to
15 knots late. a slight chance of showers. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. a slight chance
of showers. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots veering north. waves
calm to 2 feet. 
.sunday...north winds 10 to 20 knots becoming northwest 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980513

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz265-192000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt wed aug 19 2026

.early this morning...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...northwest winds 10 to 20 knots becoming northeast 5 to
15 knots late. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering south late. waves calm to
2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast in
the afternoon, then increasing to 10 to 20 knots late. a chance
of showers. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots. a chance of
showers through midnight, then showers likely after midnight.
waves calm to 2 feet. 
.friday...southeast winds 10 to 20 knots backing northeast by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.friday night...northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots increasing to 20 to
30 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet. 
.sunday...north gales to 35 knots becoming northwest 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980510

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz162-192000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt wed aug 19 2026 /300 am cdt wed aug 19 2026/

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

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980511

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz263-192000-
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-
400 am edt wed aug 19 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest late.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots becoming east less than
10 knots late. waves calm to 2 feet. 
.thursday...east winds less than 10 knots becoming southeast 5 to
15 knots 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 east
after midnight. a slight chance of thunderstorms through
midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots backing north by mid
afternoon. waves calm to 2 feet. 
.friday night...west winds 5 to 15 knots. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots veering north. waves
calm to 2 feet. 
.sunday...north winds 10 to 20 knots becoming southeast 5 to
15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 190801
glfls 
expires:202608192000;;980514

open lake forecast for lake superior
national weather service marquette mi
400 am 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...

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




lsz266-192000-
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-
400 am edt wed aug 19 2026

.early this morning...northwest winds 10 to 20 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.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 in the
afternoon. a slight chance of showers. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers through
midnight, then showers likely after midnight. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.friday night...northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.saturday...northwest winds 20 to 30 knots veering north. waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet. 
.sunday...northwest gales to 35 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$