fzus61 kbuf 311402
glflo 
expires:202608312100;;666123

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt mon aug 31 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 frontal boundary will remain stalled near the lake 
today through tuesday before moving northeast across the lake 
tuesday night as a warm front. a 29.8 inch low will then move from 
northwest ontario province tuesday night to western quebec by 
wednesday night before reaching northern new england and the 
canadian maritimes thursday night. a trailing cold front will move 
south across the lake thursday.


loz063>065-312100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt mon aug 31 2026

.rest of today...southeast winds 5 to 15 knots. a chance of
showers late this morning, then showers with a chance of
thunderstorms this afternoon. waves 2 feet or less. 
.tonight...southeast winds 10 knots or less becoming south.
showers with a chance of thunderstorms. waves 1 foot or less. 
.tuesday...southwest winds 10 knots or less becoming north.
showers likely in the morning, then a chance of showers in the
afternoon. waves 1 foot or less. 
.tuesday night...east winds 10 knots or less becoming south.
showers likely with a chance of thunderstorms overnight. waves
1 foot or less. 
.wednesday...south winds 5 to 15 knots becoming west. showers
likely with a chance of thunderstorms. waves 1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming north. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 311402
glflo 
expires:202608312100;;666122

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt mon aug 31 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 frontal boundary will remain stalled near the lake 
today through tuesday before moving northeast across the lake 
tuesday night as a warm front. a 29.8 inch low will then move from 
northwest ontario province tuesday night to western quebec by 
wednesday night before reaching northern new england and the 
canadian maritimes thursday night. a trailing cold front will move 
south across the lake thursday.


loz062-312100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt mon aug 31 2026

.rest of today...southeast winds 5 to 10 knots. showers late this
morning, then showers with a chance of thunderstorms this
afternoon. waves 1 foot or less. 
.tonight...southeast winds 10 knots or less becoming southwest.
showers with a chance of thunderstorms through the early
overnight, then a chance of showers and thunderstorms late. waves
1 foot or less. 
.tuesday...west winds 5 to 10 knots becoming east. a chance of
showers. waves 1 foot or less. 
.tuesday night...east winds 5 to 10 knots becoming south. a
chance of showers and thunderstorms in the evening, then showers
likely with a chance of thunderstorms overnight. waves 1 foot or
less. 
.wednesday...southwest winds 5 to 10 knots becoming west. showers
likely with a chance of thunderstorms. waves 2 feet or less. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 1 foot or less. 
.friday...northwest winds 10 knots or less becoming north. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 311348
glflh 
expires:202608312200;;665697

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt mon aug 31 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...developing warm front lifts over the great lakes
today, bringing an unsettled period with showers and storms. low
pressure forming over the dakotas slowly tracks across northern
ontario through the midweek. its cold front is likely to stall
across the area on wednesday.


lhz362-363-312200-
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-
948 am edt mon aug 31 2026

.rest of today...southeast winds 5 to 10 knots. showers late in
the morning...then showers and a chance of thunderstorms in the
afternoon. waves 2 feet or less. 
.tonight...southeast winds 5 to 10 knots veering to the southwest
after midnight. scattered showers and a chance of thunderstorms
in the evening. waves 2 feet or less. 
.tuesday...light and variable winds. waves 2 feet or less. 
.tuesday night...south winds 5 to 10 knots veering to the west
after midnight. a chance of showers and thunderstorms in the
evening. waves 2 feet or less. 
.wednesday...southwest winds 5 to 10 knots. a chance of showers.
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. 
.friday...light and variable winds becoming north 5 to 10 knots
in the late morning and early afternoon...then becoming light and
variable . waves 2 feet or less. 


$$

fzus63 kdtx 311348
glflh 
expires:202608312200;;665698

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt mon aug 31 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...developing warm front lifts over the great lakes
today, bringing an unsettled period with showers and storms. low
pressure forming over the dakotas slowly tracks across northern
ontario through the midweek. its cold front is likely to stall
across the area on wednesday.


lhz462>464-312200-
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-
948 am edt mon aug 31 2026

.rest of today...south winds 5 to 10 knots increasing to 10 to
15 knots late in the afternoon. showers and a chance of
thunderstorms late in the morning...then numerous showers and a
chance of thunderstorms in the afternoon. waves 2 feet or less. 
.tonight...south winds 5 to 10 knots veering to the southwest
after midnight. scattered showers and a chance of thunderstorms
in the evening. waves 2 feet or less. 
.tuesday...west winds 5 to 10 knots early in the morning becoming
light and variable...then becoming northeast 5 to 10 knots early
in the afternoon. a chance of showers in the afternoon. waves
2 feet or less. 
.tuesday night...northeast winds 5 to 10 knots veering to the
southwest in the late evening and overnight. a chance of showers.
waves 2 feet or less. 
.wednesday...southwest winds 5 to 10 knots veering to the
northeast late in the evening. a chance of waterspouts in the
morning. a chance of showers. waves 2 feet or less. 
.thursday...north winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.friday...north winds 5 to 10 knots. waves 2 feet or less. 


$$

fzus63 kdtx 311348
glfsc 
expires:202608312200;;665701

lake st clair forecast
national weather service detroit/pontiac mi
948 am edt mon aug 31 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...developing warm front lifts over the great lakes
today, bringing an unsettled period with showers and storms. low
pressure forming over the dakotas slowly tracks across northern
ontario through the midweek. its cold front is likely to stall
across the area on wednesday.


lcz460-312200-
lake st clair-
948 am edt mon aug 31 2026

.rest of today...southwest winds 5 to 10 knots becoming south 10 to
15 knots late in the afternoon. cloudy in the late morning and early
afternoon becoming partly sunny. scattered light showers. waves 2
feet or less.
.tonight...southwest winds 10 to 15 knots diminishing to 5 to 10
knots after midnight. partly cloudy. waves 2 feet or less.
.tuesday...southwest winds 5 to 10 knots. mostly sunny. waves 2 feet
or less.
.tuesday night...west winds 5 to 10 knots. partly cloudy. waves 2
feet or less.
.wednesday...southwest winds 5 to 10 knots. mostly sunny in the
morning...then a chance of showers and thunderstorms in the
afternoon. partly cloudy with light showers likely and a chance of
thunderstorms in the evening. waves 2 feet or less.
.thursday...northeast winds 5 to 10 knots. partly cloudy. light
showers likely and a chance of thunderstorms. waves 2 feet or less.
.friday...northeast winds 10 to 15 knots. partly cloudy. waves 2
feet or less.

$$

fzus63 kdtx 311348
glflh 
expires:202608312200;;665696

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt mon aug 31 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...developing warm front lifts over the great lakes
today, bringing an unsettled period with showers and storms. low
pressure forming over the dakotas slowly tracks across northern
ontario through the midweek. its cold front is likely to stall
across the area on wednesday.


lhz361-312200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
948 am edt mon aug 31 2026

.rest of today...east winds 5 to 10 knots. showers late in the
morning...then showers and a chance of thunderstorms in the
afternoon. waves 2 feet or less. 
.tonight...east winds 5 to 10 knots in the evening becoming light
and variable. scattered showers in the evening. waves 2 feet or
less. 
.tuesday...light and variable winds. a chance of showers in the
afternoon. waves 2 feet or less. 
.tuesday night...southeast winds 5 to 10 knots veering to the
west after midnight. a chance of showers. waves 2 feet or less. 
.wednesday...west winds 5 to 10 knots veering to the northwest
late in the evening. a chance of showers late 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. 
.friday...light and variable winds. waves 2 feet or less. 


$$

fzus63 kmkx 311405
glflm 
expires:202608312130;;666331

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
905 am cdt mon aug 31 2026

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

south-southwest winds will become breezy once again this 
afternoon, when 25-30 knot gusts are anticipated over at least the
southern two-thirds of the waters. gales are not anticipated.
winds weaken overnight as 29.5 inch low pressure shifts from the 
canadian prairies into ontario into tuesday, reaching the 
southern shores of the hudson bay by wednesday. low pressure will
pull a slow-moving cold front over lake michigan in the process, 
with north-northeast winds establishing in the wake of the 
boundary wednesday. the front may stall over the lake, but exact
location uncertain. with the front in the vicinity, shower and 
storm chances continue tonight through at least midweek. a few 
stronger storms with gusty winds and hail are possible. if the 
front remains close to stationary through the first half of the 
week, it will ultimately clear south of lake michigan by thursday,
bringing northeast winds for the end of the week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-312130-
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-
905 am cdt mon aug 31 2026

sheboygan wi to pentwater mi south...

.rest of today...south winds 10 to 20 kt increasing to 15 to
25 kt. slight chance of showers and thunderstorms. waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft. 
.tonight...southwest winds 15 to 25 kt diminishing to 10 to
15 kt. slight chance of showers in the evening. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.tuesday...southwest winds 10 to 15 kt. waves 1 to 2 ft. 
.tuesday night...southwest winds 10 to 15 kt. waves 1 to 2 ft. 
.wednesday...south winds 10 to 15 kt. waves 1 to 2 ft. 
.wednesday night...northwest winds 10 to 15 kt becoming north.
chance of showers and thunderstorms. waves 1 to 2 ft. 
.thursday...northeast winds 5 to 10 kt becoming north 10 to
15 kt. chance of showers. waves 1 to 2 ft. 
.friday...east winds 10 to 15 kt becoming northeast. waves 1 to
2 ft.  

$$

fzus63 kmkx 311405
glflm 
expires:202608312130;;666330

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
905 am cdt mon aug 31 2026

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

south-southwest winds will become breezy once again this 
afternoon, when 25-30 knot gusts are anticipated over at least the
southern two-thirds of the waters. gales are not anticipated.
winds weaken overnight as 29.5 inch low pressure shifts from the 
canadian prairies into ontario into tuesday, reaching the 
southern shores of the hudson bay by wednesday. low pressure will
pull a slow-moving cold front over lake michigan in the process, 
with north-northeast winds establishing in the wake of the 
boundary wednesday. the front may stall over the lake, but exact
location uncertain. with the front in the vicinity, shower and 
storm chances continue tonight through at least midweek. a few 
stronger storms with gusty winds and hail are possible. if the 
front remains close to stationary through the first half of the 
week, it will ultimately clear south of lake michigan by thursday,
bringing northeast winds for the end of the week.


lmz261-362-364-366-563-565-567-868-312130-
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-
905 am cdt mon aug 31 2026

sheboygan wi to pentwater mi north...

.rest of today...south winds 10 to 20 kt increasing to 30 kt.
chance of showers and slight chance of thunderstorms through mid
morning. waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft. 
.tonight...south winds 15 to 25 kt diminishing to 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight becoming northwest late. waves 3 to 5 ft subsiding to
2 to 4 ft. 
.tuesday...northeast winds 5 to 10 kt veering to 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 3 ft. 
.tuesday night...southwest winds 10 to 15 kt becoming west 5 to
10 kt. chance of showers overnight. waves 1 to 2 ft. 
.wednesday...northwest winds 10 to 15 kt becoming north. chance
of showers in the morning. waves 1 to 2 ft. 
.wednesday night...northeast winds 5 to 10 kt. waves 1 ft or
less. 
.thursday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 ft or less. 
.friday...east winds 5 to 10 kt becoming northeast 10 to 15 kt.
waves 1 ft or less.  

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666007

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz162-312000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon aug 31 2026 /901 am cdt mon aug 31 2026/

.rest of today...east winds 5 to 15 knots backing northeast in
the afternoon, then backing west late. waves calm to 2 feet. 
.tonight...west winds 5 to 15 knots backing southwest after
midnight. waves calm to 2 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. waves building
to 1 to 3 feet. 
.tuesday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.friday...northeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666008

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz263-312000-
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 am edt mon aug 31 2026

.rest of today...southeast winds 10 to 20 knots becoming east
5 to 15 knots in the afternoon, then veering west late. patchy
fog. a chance of showers and a slight chance of thunderstorms.
waves 1 to 3 feet. 
.tonight...west winds 5 to 15 knots backing southwest after
midnight. patchy fog. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. waves building
to 2 to 4 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...east winds less than 10 knots. waves calm to
2 feet. 
.thursday...east winds 10 to 20 knots. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666009

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz264-312000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt mon aug 31 2026

.rest of today...southeast winds 10 to 20 knots diminishing to
5 to 15 knots late. patchy fog. a chance of showers. a slight
chance of thunderstorms by mid afternoon. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots backing southwest late.
patchy fog. waves subsiding to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots increasing to 15 to
25 knots. patchy fog through early afternoon. waves building to
1 to 3 feet. 
.tuesday night...west winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming west less
than 10 knots by mid afternoon. waves calm to 2 feet. 
.wednesday night...west winds less than 10 knots veering north
after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday...east winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666010

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz265-312000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt mon aug 31 2026

.rest of today...southeast winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon, then backing east late. patchy
fog by late morning. a slight chance of showers and thunderstorms
by mid afternoon. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...west winds 10 to 20 knots backing southwest late.
patchy fog. waves calm to 2 feet. 
.tuesday...south winds 10 to 20 knots veering west late. patchy
fog through early afternoon. waves calm to 2 feet. 
.tuesday night...west winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering north by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...east winds 5 to 15 knots veering southeast. waves
calm to 2 feet. 
.friday...east winds 10 to 20 knots veering southeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666011

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz266-312000-
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 am edt mon aug 31 2026

.rest of today...southeast winds 10 to 20 knots. patchy fog. a
chance of showers and a slight chance of thunderstorms. waves
1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.tonight...southeast winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. a slight chance
of showers and thunderstorms through midnight. patchy fog through
midnight, then areas of dense fog after midnight. waves subsiding
to calm to 2 feet. 
.tuesday...south winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then veering southwest late. patchy dense fog
through early afternoon. waves building to 1 to 3 feet. 
.tuesday night...west winds 10 to 20 knots. waves subsiding to
calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering northwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots veering east. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots veering southeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202608312000;;666012

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon aug 31 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis...

a 29.4 inch low over southern saskatchewan will weaken to 29.6 
inches as it moves to east-central manitoba late tonight. this will 
bring a weak, broad 29.9 inch trough over the upper great lakes. 
weak troughing remains over the lake until ridging of around 29.9 
inches builds over the lake on wednesday and strengthens to 30.1 
inches through friday. ridging will continue to build to 30.2 inches 
by sunday morning as a high pressure center over eastern canada 
moves southward over the weekend.




lsz267-312000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt mon aug 31 2026

.rest of today...southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. patchy fog. a chance of showers and a slight
chance of thunderstorms. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.tonight...southeast winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. a slight chance
of showers and thunderstorms through midnight. patchy fog through
midnight, then areas of dense fog after midnight. waves subsiding
to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing south in the
afternoon, then increasing to 10 to 20 knots late. widespread
dense fog through early afternoon. waves calm to 2 feet. 
.tuesday night...west winds 10 to 20 knots. a slight chance of
showers through midnight. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. 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 veering north. waves
calm to 2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 

$$