fzus61 kbuf 180802
glflo 
expires:202608181500;;926056

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue aug 18 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 ridge of high pressure averaging 30.0 inches will 
build from the central great lakes today. the ridge exits eastward 
tonight before a cold front sweeps eastward across lake ontario on 
wednesday. behind the front, a ridge averaging 30.1 inches builds 
from the western great lakes and vicinity through friday. this ridge 
should exit eastward friday night through saturday and allow a warm 
front to drift northward across lake ontario.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue aug 18 2026

.today...north winds 10 knots or less becoming southwest. waves
1 foot or less. 
.tonight...southwest winds 10 to 15 knots. a chance of showers
after midnight. showers likely late. waves 1 to 3 feet. 
.wednesday...southwest winds 5 to 10 knots becoming west. a
chance of showers. waves 1 to 2 feet. 
.wednesday night...northwest winds 5 to 10 knots. waves 2 feet or
less. 
.thursday...northwest winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers during the day, then showers likely saturday
night. waves 2 feet or less. 

$$

fzus61 kbuf 180802
glflo 
expires:202608181500;;926057

open lake forecast for lake ontario
national weather service buffalo ny
402 am edt tue aug 18 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 ridge of high pressure averaging 30.0 inches will 
build from the central great lakes today. the ridge exits eastward 
tonight before a cold front sweeps eastward across lake ontario on 
wednesday. behind the front, a ridge averaging 30.1 inches builds 
from the western great lakes and vicinity through friday. this ridge 
should exit eastward friday night through saturday and allow a warm 
front to drift northward across lake ontario.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue aug 18 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180735
glfle 
expires:202608181415;;925318

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 18 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez165>167-181415-
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-
335 am edt tue aug 18 2026

.today...north winds 10 knots or less becoming west. waves 1 foot
or less. 
.tonight...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers with a slight chance of
thunderstorms after midnight. waves 1 to 3 feet building to 2 to
4 feet. 
.wednesday...west winds 5 to 15 knots. a chance of showers. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...north winds 5 to 10 knots becoming east. a
chance of showers in the evening. waves 2 feet or less. 
.thursday...east winds 5 to 10 knots. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming south. waves
1 foot or less. 
.saturday...southwest winds 10 to 15 knots becoming west. a
chance of showers during the day, then showers likely with a
chance of thunderstorms saturday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180735
glfle 
expires:202608181415;;925319

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 18 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez061-168-169-181415-
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-
335 am edt tue aug 18 2026

.today...northwest winds 10 knots or less becoming west. waves
1 foot or less. 
.tonight...southwest winds 10 to 15 knots. a chance of showers
with a slight chance of thunderstorms after midnight. waves 1 to
3 feet building to 2 to 4 feet. 
.wednesday...west winds 10 to 15 knots. showers likely in the
morning, then a chance of showers in the afternoon. waves 2 to
4 feet. 
.wednesday night...west winds 5 to 10 knots becoming northeast.
waves 1 to 2 feet. 
.thursday...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...south winds 5 to 10 knots becoming southwest. a
chance of showers during the day, then showers likely with a
chance of thunderstorms saturday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180735
glfle 
expires:202608181415;;925317

open lake forecast for lake erie
national weather service cleveland oh
335 am edt tue aug 18 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...
high pressure 30.00 inches will move south of lake erie today. a 
cold front will move south across the lake on wednesday. high 
pressure 30.20 inches will build over the lake on thursday and 
friday. low pressure 30.10 inches will enter the central great 
lakes region on saturday with a cold front approaching lake erie 
from the west.


lez162>164-181415-
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-
335 am edt tue aug 18 2026

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

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 180733
glfsc 
expires:202608181545;;925236

lake st clair forecast
national weather service detroit/pontiac mi
333 am edt tue aug 18 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lcz460-181545-
lake st clair-
333 am edt tue aug 18 2026

.today...west winds 5 to 10 knots backing to the south early in the
afternoon...then increasing to 10 to 15 knots late in the afternoon.
mostly sunny. waves 2 feet or less.
.tonight...southwest winds 10 to 15 knots veering to the west early
in the morning. partly cloudy becoming mostly cloudy by midnight
becoming partly cloudy. a chance of light showers after midnight.
waves 2 feet or less.
.wednesday...northwest winds 10 to 15 knots becoming north 5 to 10
knots in the late morning and afternoon. mostly sunny. a chance of
light showers in the late morning and early afternoon. waves 2 feet
or less.
.wednesday night...northeast winds 5 to 10 knots. mostly clear.
waves 2 feet or less.
.thursday...east winds 5 to 10 knots. mostly clear. waves 2 feet or
less.
.friday...south winds 10 to 15 knots. mostly clear. waves 2 feet or
less.
.saturday...west winds 5 to 10 knots. partly cloudy. a chance of
showers and thunderstorms. waves 2 feet or less.

$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925232

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 18 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz361-181545-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
333 am edt tue aug 18 2026

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


$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925233

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 18 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz362-363-181545-
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-
333 am edt tue aug 18 2026

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


$$

fzus63 kdtx 180733
glflh 
expires:202608181545;;925234

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 am edt tue aug 18 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...diffuse area of high pressure, 30.00 inches, will wash
out across the eastern great lakes this morning. a cold front
will then push across the region from north to south this
afternoon and evening. this will bring showers and thunderstorms
and will veer winds from southwest to northwest in the wake of
the front.


lhz462>464-181545-
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-
333 am edt tue aug 18 2026

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


$$

fzus63 kmkx 180813
glflm 
expires:202608181515;;927150

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt tue aug 18 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...

low pressure around 29.6 inches moving across the hudson bay 
region today will drag a cold front southward across lake michigan  
this afternoon and evening. expect prevailing west to 
southwesterly winds ahead of the cold front along with a few 
thunderstorms through this evening. then the cold front will push 
down the lake by wednesday bringing a north-northwesterly winds 
shift. winds will weaken and become more variable as high pressure
around 30.0 inches tracks through the western great lakes through
thursday. southwesterly winds and thunderstorm chances return 
later friday as another system is progged to bring another cold 
front across the upper great lakes region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-181515-
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-
313 am cdt tue aug 18 2026

sheboygan wi to pentwater mi south...

.today...west winds 10 to 20 kt becoming southwest 15 to 25 kt.
chance of showers and slight chance of thunderstorms this
afternoon. waves 2 to 4 ft. 
.tonight...southwest winds 10 to 20 kt veering to north 10 to
15 kt. chance of showers and thunderstorms in the evening, then
slight chance of showers and thunderstorms overnight. waves 3 to
5 ft subsiding to 1 to 3 ft. 
.wednesday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.wednesday night...northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. waves 1 to 2 ft. 
.thursday...southeast winds 5 to 10 kt becoming south 10 to 20 kt
in the afternoon. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt. waves 1 to 3 ft. 
.friday...southwest winds 10 to 20 kt increasing to 15 to 25 kt.
waves 2 to 4 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft.  

$$

fzus63 kmkx 180813
glflm 
expires:202608181515;;927149

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
313 am cdt tue aug 18 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...

low pressure around 29.6 inches moving across the hudson bay 
region today will drag a cold front southward across lake michigan  
this afternoon and evening. expect prevailing west to 
southwesterly winds ahead of the cold front along with a few 
thunderstorms through this evening. then the cold front will push 
down the lake by wednesday bringing a north-northwesterly winds 
shift. winds will weaken and become more variable as high pressure
around 30.0 inches tracks through the western great lakes through
thursday. southwesterly winds and thunderstorm chances return 
later friday as another system is progged to bring another cold 
front across the upper great lakes region.


lmz261-362-364-366-563-565-567-868-181515-
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-
313 am cdt tue aug 18 2026

sheboygan wi to pentwater mi north...

.today...west winds 10 to 20 kt becoming southwest 15 to 25 kt.
slight chance of showers and thunderstorms this morning, then
chance of showers and thunderstorms this afternoon. waves 2 to
4 ft. 
.tonight...northwest winds 10 to 20 kt diminishing to 10 to
15 kt. chance of showers and thunderstorms in the evening. waves
2 to 4 ft subsiding to 1 to 3 ft. 
.wednesday...northwest winds 10 to 15 kt backing to southwest
10 to 20 kt. waves 1 to 2 ft. 
.wednesday night...south winds 10 to 15 kt becoming southeast.
waves 1 to 2 ft. 
.thursday...southwest winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 2 ft. 
.thursday night...south winds 10 to 20 kt increasing to 15 to
25 kt. waves 2 to 4 ft. 
.friday...southwest winds to 30 kt. chance of showers. waves 3 to
5 ft. 
.saturday...northwest winds 10 to 20 kt increasing to 30 kt.
waves 1 to 3 ft.  

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926013

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt tue aug 18 2026 /301 am cdt tue aug 18 2026/

.early this morning...west winds 5 to 15 knots. waves calm to
2 feet. 
.today...northwest winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. waves building to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots veering northwest late. waves
subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming north
less than 10 knots after midnight. waves calm to 2 feet. 
.thursday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. a chance of showers. waves calm to
2 feet. 
.thursday night...east winds 5 to 15 knots backing northeast
after midnight. showers likely through midnight. waves calm to
2 feet. 
.friday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 
.saturday...northwest winds 5 to 15 knots veering north. waves
calm to 2 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926014

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz263-182000-
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 tue aug 18 2026

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

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926015

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt tue aug 18 2026

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

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926016

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt tue aug 18 2026

.early this morning...west winds 20 to 30 knots. a slight chance
of showers and thunderstorms. waves 1 to 3 feet. 
.today...west winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon, then backing west late. waves building
to 2 to 4 feet, then subsiding to calm to 2 feet. 
.tonight...west winds 15 to 25 knots. waves calm to 2 feet. 
.wednesday...west winds 10 to 20 knots veering northwest in the
afternoon, then becoming north 5 to 15 knots late. waves calm to
2 feet. 
.wednesday night...south winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. waves calm to 2 feet. 
.thursday...southwest winds 5 to 15 knots backing southeast by
mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers. waves calm to 2 feet. 
.friday...northeast winds 10 to 20 knots backing northwest. a
chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots. waves building to
2 to 4 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926017

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz266-182000-
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 tue aug 18 2026

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

$$

fzus63 kmqt 180801
glfls 
expires:202608182000;;926018

open lake forecast for lake superior
national weather service marquette mi
401 am edt tue aug 18 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 29.5 inch low will remain over the hudson bay through thursday 
before shifting east away from the region. this will extend 
troughing of 29.9 inches over lake superior through this afternoon, 
then weak 29.9 inch ridging returns to lake superior by tonight. a 
30.0 inch high pressure settles over the northern plains today and 
tonight, eventually moving over lake superior tomorrow evening 
before expanding to cover much of the great lakes by thursday 
afternoon. friday into the weekend, a low pressure of around 29.8 
inches transits across northern ontario quickly followed by 30.2 
inch ridging for the latter part of the weekend into next week.




lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt tue aug 18 2026

.early this morning...southwest winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms. waves 1 to 3 feet. 
.today...west winds 10 to 20 knots. a slight chance of showers
and thunderstorms through early afternoon. waves 1 to 3 feet. 
.tonight...west winds 10 to 20 knots. waves subsiding to calm to
2 feet. 
.wednesday...northwest winds 10 to 20 knots backing west in the
afternoon, then becoming northwest 5 to 15 knots late. waves calm
to 2 feet. 
.wednesday night...west winds 5 to 15 knots backing south after
midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots veering northwest by mid
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of showers. waves calm to
2 feet. 
.friday...southeast winds 10 to 20 knots backing east. showers
likely, then a chance of showers. waves calm to 2 feet. 
.saturday...northwest winds 10 to 20 knots becoming north 15 to
25 knots. waves building to 2 to 4 feet. 

$$