fzus63 kdtx 111945
glflh 
expires:202608120345;;015803

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt tue aug 11 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 quasi-stationary front holds over the southern great
lakes through mid-week, bringing waves of showers and
thunderstorms across the waters. high pressure, 30.00 inches,
will dominate the region to the north of the front. light winds
will be variable over the next 2 days, but maintain an overall
northerly trend over lake huron and southerly toward western lake
erie.


lhz361-120345-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
345 pm edt tue aug 11 2026

.tonight...light and variable winds. waves 2 feet or less. 
.wednesday...light and variable winds becoming west 5 to 10 knots
late in the afternoon. waves 2 feet or less. 
.wednesday night...west winds 5 to 10 knots. waves 2 feet or
less. 
.thursday...northwest winds 5 to 10 knots. waves 2 feet or less. 
.thursday night...northwest winds 5 to 10 knots becoming north
10 to 15 knots in the late evening and overnight. waves 2 feet or
less. 
.friday...north winds 5 to 10 knots in the morning becoming light
and variable. waves 2 feet or less. 
.saturday...southeast winds 5 to 10 knots increasing to 10 to
15 knots . a chance of showers . waves 2 feet or less building to
2 to 4 feet . 
.sunday...southeast winds 5 to 10 knots becoming south 10 to
15 knots in the late morning and early afternoon...then becoming
west 5 to 10 knots early in the evening becoming northwest 10 to
15 knots by midnight. a chance of showers until afternoon. waves
1 to 3 feet. 


$$

fzus63 kdtx 111945
glflh 
expires:202608120345;;015804

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt tue aug 11 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 quasi-stationary front holds over the southern great
lakes through mid-week, bringing waves of showers and
thunderstorms across the waters. high pressure, 30.00 inches,
will dominate the region to the north of the front. light winds
will be variable over the next 2 days, but maintain an overall
northerly trend over lake huron and southerly toward western lake
erie.


lhz362-363-120345-
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-
345 pm edt tue aug 11 2026

.tonight...light and variable winds. waves 2 feet or less. 
.wednesday...light and variable winds. waves 2 feet or less. 
.wednesday night...light and variable winds becoming west 5 to
10 knots after midnight. waves 2 feet or less. 
.thursday...northwest winds 5 to 10 knots veering to the north in
the late morning and afternoon. waves 2 feet or less. 
.thursday night...north winds 5 to 10 knots increasing to 10 to
15 knots after midnight. waves 2 feet or less. 
.friday...north winds 10 to 15 knots becoming light and variable.
waves 2 feet or less. 
.saturday...southeast winds 5 to 10 knots increasing to 10 to
15 knots by midnight. a chance of showers . waves 2 feet or less.
.sunday...south winds 10 to 15 knots becoming west 5 to 10 knots
. a chance of showers. waves 1 to 3 feet. 


$$

fzus63 kdtx 111945
glflh 
expires:202608120345;;015805

open lake forecast for lake huron
national weather service detroit/pontiac mi
345 pm edt tue aug 11 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 quasi-stationary front holds over the southern great
lakes through mid-week, bringing waves of showers and
thunderstorms across the waters. high pressure, 30.00 inches,
will dominate the region to the north of the front. light winds
will be variable over the next 2 days, but maintain an overall
northerly trend over lake huron and southerly toward western lake
erie.


lhz462>464-120345-
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-
345 pm edt tue aug 11 2026

.tonight...light and variable winds. waves 2 feet or less. 
.wednesday...light and variable winds becoming north 5 to
10 knots late in the morning...then becoming light and variable
early in the afternoon becoming north 5 to 10 knots late in the
afternoon. a chance of showers in the afternoon. waves 2 feet or
less. 
.wednesday night...northeast winds 5 to 10 knots early in the
evening becoming light and variable. waves 2 feet or less. 
.thursday...north winds 5 to 10 knots. waves 2 feet or less. 
.thursday night...north winds 5 to 10 knots. waves 2 feet or
less. 
.friday...north winds 5 to 10 knots increasing to 10 to 15 knots
late in the morning...then becoming northeast 5 to 10 knots late
in the evening. waves 1 to 3 feet building to 2 to 4 feet late in
the afternoon. 
.saturday...east winds 5 to 10 knots becoming southeast 10 to
15 knots by midnight. a chance of showers by midnight. waves
2 feet or less. 
.sunday...south winds 10 to 15 knots becoming southwest 5 to
10 knots early in the evening...then veering to the northwest by
midnight. a chance of showers. a chance of thunderstorms until
early evening. waves 1 to 3 feet. 


$$

fzus63 kmkx 111944
glflm 
expires:202608120315;;015797

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
244 pm cdt tue aug 11 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...

predominantly light and variable winds are expected to continue 
today through thursday, with periodic chances for showers and 
thunderstorms for the southern third of the lake (near a stalled 
frontal boundary). patchy fog is also possible along and south
of the frontal boundary.

high pressure around 30.3 inches builds into the great lakes region 
thursday night, resulting in a 10 to 20 kt northeast breeze across 
lake michigan and pushing the frontal boundary south of the lake. 
these winds will continue into friday, with dry weather expected. 

winds veer southeast and accelerate into saturday as high pressure 
shifts over the lower great lakes and low pressure lifts northeast 
from the central plains. this system will bring chances for showers 
and thunderstorms at times saturday morning through sunday morning. 
decelerating northwest winds expected into early next week behind 
the associated cold front. 


lmz080-669-671-673-675-777-779-870-872-874-876-878-120315-
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-
244 pm cdt tue aug 11 2026

sheboygan wi to pentwater mi south...

.tonight...south winds 5 to 10 kt becoming east. chance of
thunderstorms and slight chance of showers. patchy fog overnight.
waves 1 ft or less. 
.wednesday...southeast winds 5 to 10 kt becoming southwest.
patchy fog in the morning. chance of thunderstorms and slight
chance of showers in the afternoon. waves 1 ft or less. 
.wednesday night...northeast winds 5 to 10 kt becoming east.
waves nearly calm. 
.thursday...east winds 5 to 10 kt becoming northeast 10 to 20 kt
in the afternoon. chance of showers. waves 1 to 2 ft. 
.thursday night...northeast winds 10 to 20 kt. chance of showers
in the evening. waves 2 to 4 ft building to 3 to 5 ft. 
.friday...northeast winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft. 
.friday night...northeast winds 10 to 20 kt becoming southeast
15 to 25 kt. waves 2 to 4 ft building to 3 to 5 ft. 
.saturday...southeast winds to 30 kt. chance of showers and
thunderstorms. waves 5 to 8 ft occasionally to 10 ft. 
.sunday...west winds 10 to 20 kt becoming northwest. chance of
showers. waves 2 to 4 ft.  

$$

fzus63 kmkx 111944
glflm 
expires:202608120315;;015796

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
244 pm cdt tue aug 11 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...

predominantly light and variable winds are expected to continue 
today through thursday, with periodic chances for showers and 
thunderstorms for the southern third of the lake (near a stalled 
frontal boundary). patchy fog is also possible along and south
of the frontal boundary.

high pressure around 30.3 inches builds into the great lakes region 
thursday night, resulting in a 10 to 20 kt northeast breeze across 
lake michigan and pushing the frontal boundary south of the lake. 
these winds will continue into friday, with dry weather expected. 

winds veer southeast and accelerate into saturday as high pressure 
shifts over the lower great lakes and low pressure lifts northeast 
from the central plains. this system will bring chances for showers 
and thunderstorms at times saturday morning through sunday morning. 
decelerating northwest winds expected into early next week behind 
the associated cold front. 


lmz261-362-364-366-563-565-567-868-120315-
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-
244 pm cdt tue aug 11 2026

sheboygan wi to pentwater mi north...

.tonight...east winds 5 to 10 kt becoming northeast. patchy fog
overnight. slight chance of showers and thunderstorms overnight.
waves nearly calm. 
.wednesday...east winds less than 10 kt veering to south late in
the morning, then becoming southwest early in the afternoon
becoming south late. patchy fog in the morning. waves 1 ft or
less. 
.wednesday night...southwest winds 5 to 10 kt backing to
northeast. waves 1 ft or less. 
.thursday...northeast winds 5 to 10 kt becoming north 10 to 20 kt
in the afternoon. waves 1 to 2 ft. 
.thursday night...north winds 10 to 20 kt becoming northeast.
waves 2 to 4 ft. 
.friday...northeast winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.friday night...northeast winds 15 to 25 kt becoming southeast.
waves 2 to 4 ft building to 3 to 5 ft. 
.saturday...southeast winds to 30 kt. chance of showers. waves
5 to 8 ft occasionally to 10 ft. 
.sunday...west winds 10 to 20 kt becoming northwest. chance of
showers. waves 2 to 4 ft.  

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016341

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz266-120800-
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 tue aug 11 2026

.late this afternoon...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...southwest winds 5 to 15 knots backing south late.
waves calm to 2 feet. 
.wednesday...south winds 5 to 15 knots veering west in the
afternoon, then veering northwest late. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.friday...north winds 5 to 15 knots veering northeast by mid
afternoon. waves calm to 2 feet. 
.friday night...east winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 15 to 25 knots veering south. a
chance of showers, then showers likely. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016342

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz267-120800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 pm edt tue aug 11 2026

.late this afternoon...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.tonight...northwest winds 5 to 15 knots becoming west less than
10 knots after midnight. waves calm to 2 feet. 
.wednesday...south winds 5 to 15 knots backing north in the
afternoon, then backing northwest late. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet. 
.friday...north winds 5 to 15 knots backing northwest by mid
afternoon. waves calm to 2 feet. 
.friday night...north winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet. 
.saturday...southeast winds 10 to 20 knots. a chance of showers.
waves calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016337

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz162-120800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt tue aug 11 2026 /301 pm cdt tue aug 11 2026/

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots backing northeast after
midnight, then becoming northwest less than 10 knots late. patchy
fog after midnight. waves calm to 2 feet. 
.wednesday...northwest winds less than 10 knots becoming
southwest 5 to 15 knots in the afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots. a slight chance
of showers after midnight. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 10 to 20 knots becoming northwest 5 to
15 knots. a chance of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016338

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz263-120800-
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 tue aug 11 2026

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots becoming southwest less than
10 knots after midnight, then veering west late. waves calm to
2 feet. 
.wednesday...west winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing south late. waves calm to
2 feet. 
.wednesday night...east winds 5 to 15 knots becoming northeast
less than 10 knots after midnight. a slight chance of showers
after midnight. waves calm to 2 feet. 
.thursday...northeast winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots increasing to 15 to 25 knots
by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. waves calm to 2 feet. 
.saturday...east winds 5 to 15 knots backing northwest. a chance
of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016339

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz264-120800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 pm edt tue aug 11 2026

.late this afternoon...south winds less than 10 knots. waves calm
to 2 feet. 
.tonight...southwest winds less than 10 knots veering west late.
waves calm to 2 feet. 
.wednesday...west winds less than 10 knots veering northwest
late. waves calm to 2 feet. 
.wednesday night...west winds less than 10 knots veering
northwest late. waves calm to 2 feet. 
.thursday...north winds less than 10 knots. waves calm to 2 feet.
.thursday night...north winds less than 10 knots. waves calm to
2 feet. 
.friday...northeast winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.saturday...southeast winds 10 to 20 knots. a chance of showers.
waves building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.sunday...northwest winds 5 to 15 knots backing west. waves calm
to 2 feet. 

$$

fzus63 kmqt 112001
glfls 
expires:202608120800;;016340

open lake forecast for lake superior
national weather service marquette mi
401 pm edt tue aug 11 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...

lake superior remains under weak 29.9 inch ridging broadly 
associated with 30.1 inch high pressure over the southern 
appalachians while 29.6 inch low pressure is over labrador and 29.8 
inch low pressure is over the central plains. by tonight, the 
labrador low descends to the gulf of st lawrence and deepens to 29.5 
inches while the plains low deepens to 29.7 inches, eroding the 
ridge over lake superior to 29.8 inches. this pattern holds until 
thursday morning, when a 30.2 inch high over the canadian rockies 
begins to extend stronger ridging over lake superior before 
eventually becoming centered over the lake at 30.2 inches friday 
afternoon. a 29.9 inch trough then moves over the western end of the 
lake saturday afternoon as the 30.2 inch high moves over the eastern 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching ontario by sunday afternoon, 
with 30.1 inch ridging to follow.




lsz265-120800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 pm edt tue aug 11 2026

.late this afternoon...east winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...southeast winds 5 to 15 knots veering southwest late.
waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering northeast in the
afternoon. waves calm to 2 feet. 
.wednesday night...east winds 5 to 15 knots veering west after
midnight. a slight chance of showers after midnight. waves calm
to 2 feet. 
.thursday...north winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.friday...northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.saturday...southeast winds 15 to 25 knots veering south. a
chance of showers, then showers likely. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots backing west. waves calm
to 2 feet. 

$$