fzus61 kbuf 130802
glflo 
expires:202608131500;;105123

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 13 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 trough averaging 29.7 inches lingers over the lake ontario region 
today. a high pressure ridge averaging 30.2 inches begins to build 
from the canadian prairies tonight before settling over lake ontario 
and vicinity by this saturday. the ridge begins to exit eastward 
saturday night through sunday morning and allows a warm front to 
sweep northeastward across lake ontario as a low of 29.7 inches 
moves eastward across the northern great lakes. this low should move 
generally east-southeastward from near the northern great lakes to 
near the gulf of maine later sunday through this monday. the low 
track should allow a cold front to sweep eastward across lake 
ontario sunday evening through sunday night. behind the cold front, 
a high pressure ridge averaging 30.0 inches should attempt to build 
from the upper midwest through monday.


loz063>065-131500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu aug 13 2026

.today...west winds 5 to 10 knots. waves 1 foot or less. 
.tonight...west winds 10 knots or less becoming north. waves
1 foot or less. 
.friday...northeast winds 10 knots or less. waves 1 foot or less.
.friday night...northeast winds 10 knots or less. waves 1 foot or
less. 
.saturday...northeast winds 10 knots or less becoming southeast.
a chance of showers saturday night. waves 1 foot or less. 
.sunday...south winds 5 to 15 knots becoming northwest. showers
likely with a chance of thunderstorms. waves 1 foot or less. 
.monday...north winds 5 to 15 knots. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 130802
glflo 
expires:202608131500;;105122

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 13 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 trough averaging 29.7 inches lingers over the lake ontario region 
today. a high pressure ridge averaging 30.2 inches begins to build 
from the canadian prairies tonight before settling over lake ontario 
and vicinity by this saturday. the ridge begins to exit eastward 
saturday night through sunday morning and allows a warm front to 
sweep northeastward across lake ontario as a low of 29.7 inches 
moves eastward across the northern great lakes. this low should move 
generally east-southeastward from near the northern great lakes to 
near the gulf of maine later sunday through this monday. the low 
track should allow a cold front to sweep eastward across lake 
ontario sunday evening through sunday night. behind the cold front, 
a high pressure ridge averaging 30.0 inches should attempt to build 
from the upper midwest through monday.


loz062-131500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt thu aug 13 2026

.today...northwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.tonight...west winds 10 knots or less becoming north. waves
1 foot or less. 
.friday...northeast winds less than 10 knots becoming east. waves
1 foot or less. 
.friday night...east winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.saturday...east winds 5 to 10 knots becoming southeast. a chance
of showers saturday night. waves 1 foot or less. 
.sunday...south winds 5 to 10 knots becoming northwest. showers
likely with a chance of thunderstorms. waves 1 foot or less. 
.monday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 131306
glfle 
expires:202608132015;;117259

open lake forecast for lake erie
national weather service cleveland oh
906 am edt thu aug 13 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 frontal boundary will finally push into the ohio valley today as
high pressure 30.00 inches builds into the great lakes. this high
will shift over lake erie friday and strengthen to 30.10 inches
before drifting southeast late saturday to allow a warm front to 
lift north across the lake by sunday morning. low pressure 29.90
inches crossing the central great lakes sunday will pull a cold
front across the lake sunday night.


lez061-168-169-132015-
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-
906 am edt thu aug 13 2026

.this afternoon...northwest winds less than 10 knots becoming
west. waves 1 foot or less. 
.tonight...west winds less than 10 knots becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 10 knots or less. waves 1 foot or less.
.friday night...northeast winds 5 to 10 knots becoming east.
waves 2 feet or less. 
.saturday...east winds 5 to 10 knots becoming south. showers
likely with a chance of thunderstorms saturday night. waves
2 feet or less. 
.sunday...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 sunday night. waves
2 feet or less. 
.monday...north winds 5 to 15 knots. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 131306
glfle 
expires:202608132015;;117258

open lake forecast for lake erie
national weather service cleveland oh
906 am edt thu aug 13 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 frontal boundary will finally push into the ohio valley today as
high pressure 30.00 inches builds into the great lakes. this high
will shift over lake erie friday and strengthen to 30.10 inches
before drifting southeast late saturday to allow a warm front to 
lift north across the lake by sunday morning. low pressure 29.90
inches crossing the central great lakes sunday will pull a cold
front across the lake sunday night.


lez165>167-132015-
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-
906 am edt thu aug 13 2026

.this afternoon...northwest winds less than 10 knots. waves 1 foot
or less. 
.tonight...light and variable winds. waves 1 foot or less. 
.friday...east winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.friday night...northeast winds 5 to 10 knots becoming east.
waves 2 feet or less. 
.saturday...southeast winds 5 to 15 knots becoming south. showers
likely with a chance of thunderstorms saturday night. waves 1 to
2 feet. 
.sunday...southwest winds 15 to 20 knots becoming north 10 to
15 knots. showers likely with a chance of thunderstorms during
the day, then a chance of showers and thunderstorms sunday night.
waves 1 to 2 feet. 
.monday...north winds 5 to 15 knots. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 131306
glfle 
expires:202608132015;;117257

open lake forecast for lake erie
national weather service cleveland oh
906 am edt thu aug 13 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 frontal boundary will finally push into the ohio valley today as
high pressure 30.00 inches builds into the great lakes. this high
will shift over lake erie friday and strengthen to 30.10 inches
before drifting southeast late saturday to allow a warm front to 
lift north across the lake by sunday morning. low pressure 29.90
inches crossing the central great lakes sunday will pull a cold
front across the lake sunday night.


lez162>164-132015-
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-
906 am edt thu aug 13 2026

.this afternoon...northwest winds less than 10 knots. waves 1 foot
or less. 
.tonight...south winds 10 knots or less. waves 1 foot or less. 
.friday...southeast winds 5 to 10 knots becoming east. waves
1 foot or less. 
.friday night...east winds 5 to 10 knots. waves 1 foot or less. 
.saturday...southeast winds 5 to 15 knots becoming south. showers
likely with a chance of thunderstorms saturday night. waves
2 feet or less. 
.sunday...southwest winds 10 to 15 knots becoming north. showers
likely with a chance of thunderstorms during the day, then a
chance of showers sunday night. waves 1 to 2 feet. 
.monday...north winds 5 to 15 knots becoming northeast. waves
2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 130758
glfsc 
expires:202608131600;;104801

lake st clair forecast
national weather service detroit/pontiac mi
358 am edt thu aug 13 2026

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

.synopsis...a quasi-stationary front holds over the southern great
lakes bringing pockets 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.


lcz460-131600-
lake st clair-
358 am edt thu aug 13 2026

.today...light and variable winds. partly sunny. waves 2 feet or
less.
.tonight...east winds 5 to 10 knots. mostly cloudy this evening
becoming partly cloudy. waves 2 feet or less.
.friday...east winds 5 to 10 knots. partly sunny. waves 2 feet or
less.
.friday night...northeast winds 10 to 15 knots diminishing to 5 to
10 knots in the late evening and overnight. mostly clear. waves 2
feet or less.
.saturday...east winds 5 to 10 knots becoming southeast 10 to 15
knots in the afternoon and evening. partly sunny...then partly
cloudy with light showers likely and a chance of thunderstorms in
the evening. waves 2 feet or less.
.sunday...northwest winds 10 to 15 knots. partly cloudy. showers
likely and a chance of thunderstorms. waves 2 feet or less.
.monday...northeast winds 10 to 15 knots. mostly clear. waves 2 feet
or less.

$$

fzus63 kdtx 130757
glflh 
expires:202608131600;;104765

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 am edt thu aug 13 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 bringing pockets 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>464-131600-
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-
357 am edt thu aug 13 2026

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


$$

fzus63 kdtx 130757
glflh 
expires:202608131600;;104764

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 am edt thu aug 13 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 bringing pockets 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.


lhz362-363-131600-
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-
357 am edt thu aug 13 2026

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


$$

fzus63 kdtx 130757
glflh 
expires:202608131600;;104763

open lake forecast for lake huron
national weather service detroit/pontiac mi
357 am edt thu aug 13 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 bringing pockets 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.


lhz361-131600-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
357 am edt thu aug 13 2026

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


$$

fzus63 kmkx 130820
glflm 
expires:202608131530;;106462

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
320 am cdt thu aug 13 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 stalled frontal boundary just to the south of lake michigan will 
remain in place until midday today, before retreating south 
toward the ohio river valley. periodic rain, storms and areas of 
fog will be possible across the southern half of the lake until 
this front moves south. light and variable winds are expected 
across the lake today into tonight. 

high pressure around 30.3 inches is expected to build down from 
ontario into the eastern great lakes tonight into friday. 
northeast to east winds will increase across the lake becoming 
breezy as the high pressure builds in and a low pressure system 
develops across the central plains. as the low pressure around 
29.9 inches moves northeast toward the great lakes region, the 
high pressure will be slowly moving northeast toward the new 
england states. winds will turn to southeasterly and remain breezy
saturday ahead of the approaching low. this low is expected to 
track across the lake late saturday into sunday. rain and 
thunderstorms will be possible across the lake saturday into 
saturday night. as the low exits to the northeast sunday, high 
pressure around 30.2 inches is expected to move in from the 
northern plains for early next week.


lmz261-362-364-366-563-565-567-868-131530-
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-
320 am cdt thu aug 13 2026

sheboygan wi to pentwater mi north...

.today...northeast winds less than 10 kt becoming northwest late
this morning, then becoming southwest early this afternoon
becoming south late. waves 1 ft or less. 
.tonight...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft. 
.friday...northeast winds 10 to 15 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.friday night...northeast winds 10 to 20 kt becoming southeast.
waves 2 to 4 ft. 
.saturday...southeast winds 15 to 25 kt. chance of showers. waves
4 to 6 ft occasionally to 8 ft. 
.saturday night...south winds 10 to 20 kt becoming southwest
10 to 15 kt. showers likely with a chance of thunderstorms. waves
3 to 5 ft subsiding to 2 to 4 ft. 
.sunday...northwest winds 10 to 20 kt becoming north 15 to 25 kt.
waves 1 to 3 ft. 
.monday...north winds 10 to 20 kt backing to west. waves 1 to
3 ft.  

$$

fzus63 kmkx 130820
glflm 
expires:202608131530;;106463

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
320 am cdt thu aug 13 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 stalled frontal boundary just to the south of lake michigan will 
remain in place until midday today, before retreating south 
toward the ohio river valley. periodic rain, storms and areas of 
fog will be possible across the southern half of the lake until 
this front moves south. light and variable winds are expected 
across the lake today into tonight. 

high pressure around 30.3 inches is expected to build down from 
ontario into the eastern great lakes tonight into friday. 
northeast to east winds will increase across the lake becoming 
breezy as the high pressure builds in and a low pressure system 
develops across the central plains. as the low pressure around 
29.9 inches moves northeast toward the great lakes region, the 
high pressure will be slowly moving northeast toward the new 
england states. winds will turn to southeasterly and remain breezy
saturday ahead of the approaching low. this low is expected to 
track across the lake late saturday into sunday. rain and 
thunderstorms will be possible across the lake saturday into 
saturday night. as the low exits to the northeast sunday, high 
pressure around 30.2 inches is expected to move in from the 
northern plains for early next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-131530-
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-
320 am cdt thu aug 13 2026

sheboygan wi to pentwater mi south...

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

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105083

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz162-132000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu aug 13 2026 /301 am cdt thu aug 13 2026/

.early this morning...north winds 5 to 15 knots. patchy fog.
waves calm to 2 feet. 
.today...northeast winds 5 to 15 knots veering east late. a
slight chance of showers through early afternoon. waves calm to
2 feet. 
.tonight...northeast winds 5 to 15 knots. waves calm to 2 feet. 
.friday...northeast winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots becoming east 5 to
15 knots after midnight. a chance of showers after midnight.
waves subsiding to calm to 2 feet. 
.saturday...east winds 10 to 20 knots backing northeast by mid
afternoon. a chance of showers. waves calm to 2 feet. 
.saturday night...north winds 5 to 15 knots backing northwest
after midnight. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105088

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz267-132000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt thu aug 13 2026

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...northwest winds 5 to 15 knots. waves calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots veering north late.
waves calm to 2 feet. 
.friday...north winds 5 to 15 knots backing northwest late. 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 10 to 20 knots. waves calm to 2 feet.
.saturday night...south winds 10 to 20 knots veering southwest
after midnight. showers likely. waves calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105084

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz263-132000-
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 am edt thu aug 13 2026

.early this morning...northwest winds less than 10 knots. waves
calm to 2 feet. 
.today...north winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon, then veering east late. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots diminishing to less than
10 knots after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon, then veering east late. waves building
to 1 to 3 feet. 
.friday night...east winds 15 to 25 knots becoming southeast 5 to
15 knots after midnight. a slight chance of showers after
midnight. waves subsiding to calm to 2 feet. 
.saturday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 
.saturday night...west winds 5 to 15 knots veering northwest
after midnight. a chance of showers. waves calm to 2 feet. 
.sunday...west winds 5 to 15 knots. waves calm to 2 feet. 
.monday...southwest winds 10 to 20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105085

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz264-132000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt thu aug 13 2026

.early this morning...northwest winds less than 10 knots. waves
calm to 2 feet. 
.today...northwest winds less than 10 knots backing southwest
late. waves calm to 2 feet. 
.tonight...west winds less than 10 knots veering north after
midnight, then veering northeast late. waves calm to 2 feet. 
.friday...northeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. waves calm to 2 feet. 
.friday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.saturday...southeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet. 
.saturday night...south winds 5 to 15 knots veering west after
midnight. a chance of showers. waves calm to 2 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots. waves calm to 2 feet. 
.monday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105086

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz265-132000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt thu aug 13 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots veering northeast late.
waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots backing east late. waves
calm to 2 feet. 
.friday...northeast winds 5 to 15 knots becoming east 10 to
20 knots in the 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 increasing to 15 to
25 knots by mid afternoon. a chance of showers. waves building to
1 to 3 feet. 
.saturday night...south winds 10 to 20 knots veering west after
midnight. a chance of showers. waves subsiding to calm to 2 feet.
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.monday...west winds 5 to 15 knots becoming southwest 10 to
20 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 130801
glfls 
expires:202608132000;;105087

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 13 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 holds through this morning 
as a 30.2 inch high is developing over the canadian rockies. this 
high eventually becomes 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 lower 
great lakes. this trough consolidates to a 29.8 inch low as it 
passes over lake superior, reaching the ontario/quebec line by 
sunday evening. sunday night into monday, a 30.1 inch high over the 
plains will weaken to 30.0 inches as it slides south of lake 
superior. by tuesday, this high will be fully south of the great 
lakes as a 29.4 inch low over hudson bay extends a 29.8 inch trough 
over lake superior.




lsz266-132000-
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 am edt thu aug 13 2026

.early this morning...west winds 5 to 15 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 veering north late. waves
calm to 2 feet. 
.friday...northeast winds 5 to 15 knots. 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 10 to 20 knots. a chance of showers.
waves building to 1 to 3 feet. 
.saturday night...south winds 10 to 20 knots veering west after
midnight. a chance of showers through midnight. showers likely
after midnight. waves subsiding to calm to 2 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to calm
to 2 feet. 
.monday...west winds 5 to 15 knots backing southwest. waves calm
to 2 feet. 

$$