fzus61 kbuf 181402
glflo 
expires:202509182100;;193865

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu sep 18 2025

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...high pressure averaging 30.0 inches draped from the ohio 
valley to new england will gradually weaken in place today. a weak 
cold front will then cross the lake this evening, with another 30.4 
inch high then settling from central ontario to new england friday 
through saturday night, then off the new england coast sunday and 
monday.


loz062-182100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots becoming southwest.
waves 1 foot or less. 
.tonight...west winds 5 to 15 knots becoming northeast. a chance
of sprinkles after midnight. waves 1 to 3 feet. 
.friday...northeast winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday night...east winds 5 to 15 knots increasing to 15 to
20 knots. waves 2 feet or less building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.sunday...southeast winds 10 to 15 knots becoming south. a chance
of showers sunday night. waves 1 to 3 feet. 
.monday...southwest winds 10 to 15 knots. a chance of showers.
waves 1 to 2 feet. 

$$

fzus61 kbuf 181402
glflo 
expires:202509182100;;193866

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt thu sep 18 2025

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...high pressure averaging 30.0 inches draped from the ohio 
valley to new england will gradually weaken in place today. a weak 
cold front will then cross the lake this evening, with another 30.4 
inch high then settling from central ontario to new england friday 
through saturday night, then off the new england coast sunday and 
monday.


loz063>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots. waves 2 feet or less. 
.tonight...west winds 5 to 15 knots becoming north 15 to
20 knots. a chance of sprinkles from late evening on. waves 1 to
3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday night...north winds 10 to 15 knots becoming northeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...southeast winds 15 to 20 knots becoming south. waves
1 to 3 feet building to 2 to 4 feet. 
.monday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of showers. waves 2 to 4 feet subsiding to
1 to 3 feet. 

$$

fzus61 kcle 181348
glfle 
expires:202509182030;;193239

open lake forecast for lake erie
national weather service cleveland oh
948 am edt thu sep 18 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie for the time being. a cold 
front will sweep southward across the lake this evening through 
tonight. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay to atlantic waters near nova scotia by daybreak 
sunday. a warm front should drift northward across lake erie on 
sunday through early monday. behind the front, another ridge 
averaging 29.95 inches should build from the southern appalachians
through this tuesday.


lez162-163-182030-
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-
948 am edt thu sep 18 2025

.this afternoon...west winds less than 10 knots becoming
southeast. waves 1 foot or less. 
.tonight...southeast winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 10 to 15 knots becoming east. waves
2 feet or less. 
.friday night...east winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 1 to 3 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.sunday...south winds 5 to 10 knots. a chance of showers sunday
night. waves 2 feet or less. 
.monday...southwest winds 10 to 15 knots. a chance of showers.
waves 2 feet or less. 

$$

fzus61 kcle 181348
glfle 
expires:202509182030;;193240

open lake forecast for lake erie
national weather service cleveland oh
948 am edt thu sep 18 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie for the time being. a cold 
front will sweep southward across the lake this evening through 
tonight. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay to atlantic waters near nova scotia by daybreak 
sunday. a warm front should drift northward across lake erie on 
sunday through early monday. behind the front, another ridge 
averaging 29.95 inches should build from the southern appalachians
through this tuesday.


lez164>168-182030-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
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-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
948 am edt thu sep 18 2025

.this afternoon...west winds 10 knots or less. waves 1 foot or
less. 
.tonight...southwest winds 5 to 10 knots becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.friday night...east winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 3 to 6 feet. 
.sunday...south winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers sunday night. waves 1 to 3 feet. 
.monday...south winds 10 to 15 knots becoming southwest. a chance
of showers. waves 1 to 3 feet. 

$$

fzus61 kcle 181348
glfle 
expires:202509182030;;193241

open lake forecast for lake erie
national weather service cleveland oh
948 am edt thu sep 18 2025

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 ridging averaging 30.20 inches and extending from
new england lingers over lake erie for the time being. a cold 
front will sweep southward across the lake this evening through 
tonight. behind the front, another ridge averaging 30.20 inches 
affects lake erie as the parent high pressure center moves from 
near hudson bay to atlantic waters near nova scotia by daybreak 
sunday. a warm front should drift northward across lake erie on 
sunday through early monday. behind the front, another ridge 
averaging 29.95 inches should build from the southern appalachians
through this tuesday.


lez061-169-182030-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
948 am edt thu sep 18 2025

.this afternoon...west winds 5 to 10 knots. waves 2 feet or less. 
.tonight...west winds 5 to 15 knots becoming northeast. waves
1 to 2 feet. 
.friday...northeast winds 10 to 15 knots. waves 1 to 2 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.sunday...south winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers sunday night. waves 1 to 3 feet. 
.monday...south winds 10 to 15 knots becoming southwest. a chance
of showers during the day, then showers likely monday night.
waves 1 to 3 feet. 

$$

fzus63 kdtx 181350
glfsc 
expires:202509182200;;193254

lake st clair forecast
national weather service detroit/pontiac mi
950 am edt thu sep 18 2025

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...dense fog this morning across the northern half of
lake huron will mix out through the afternoon as a weak cold
front drops through the region. another strong high pressure
system then begins to build in from northern ontario, reaching
southern quebec on saturday and new england by sunday.


lcz460-182200-
lake st clair-
950 am edt thu sep 18 2025

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

$$

fzus63 kdtx 181348
glflh 
expires:202509182200;;193249

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt thu sep 18 2025

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...dense fog this morning across the northern half of
lake huron will mix out through the afternoon as a weak cold
front drops through the region. another strong high pressure
system then begins to build in from northern ontario, reaching
southern quebec on saturday and new england by sunday.


lhz462>464-182200-
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 thu sep 18 2025

.rest of today...west winds 5 to 10 knots veering to the
northwest early in the afternoon...then becoming northwest 5 to
10 knots late in the afternoon. waves 2 feet or less. 
.tonight...northeast winds 10 to 15 knots. waves 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...northeast winds 15 to 20 knots becoming east
10 to 15 knots after midnight. waves 3 to 5 feet. 
.saturday...east winds 10 to 15 knots. waves 2 to 4 feet. 
.sunday...southeast winds 10 to 15 knots veering to the south in
the late evening and early morning. a chance of showers early in
the evening. rain showers likely in the late evening and early
morning. waves 2 to 4 feet. 
.monday...south winds 10 to 15 knots decreasing to 5 to 10 knots
until early morning. showers likely...then a chance of showers in
the late evening and early morning. waves 1 to 3 feet. 


$$

fzus63 kdtx 181348
glflh 
expires:202509182200;;193248

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt thu sep 18 2025

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...dense fog this morning across the northern half of
lake huron will mix out through the afternoon as a weak cold
front drops through the region. another strong high pressure
system then begins to build in from northern ontario, reaching
southern quebec on saturday and new england by sunday.


lhz362-363-182200-
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 thu sep 18 2025

.rest of today...northwest winds 5 to 10 knots. areas of dense
fog late in the morning. patchy fog in the afternoon. waves 1 to
3 feet. 
.tonight...north winds 5 to 10 knots becoming northeast 10 to
15 knots after midnight. waves 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...northeast winds 5 to 10 knots becoming east 15 to
20 knots. waves 2 to 4 feet. 
.saturday...east winds 15 to 20 knots decreasing to 10 to
15 knots. waves 3 to 5 feet. 
.sunday...southeast winds 10 to 15 knots. a chance of showers in
the late morning and early afternoon. rain showers likely until
early morning. waves 2 to 4 feet. 
.monday...south winds 10 to 15 knots decreasing to 5 to 10 knots
until early morning. showers likely early in the morning...then a
chance of showers. waves 2 to 4 feet subsiding to 1 to 3 feet. 


$$

fzus63 kdtx 181348
glflh 
expires:202509182200;;193247

open lake forecast for lake huron
national weather service detroit/pontiac mi
948 am edt thu sep 18 2025

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...dense fog this morning across the northern half of
lake huron will mix out through the afternoon as a weak cold
front drops through the region. another strong high pressure
system then begins to build in from northern ontario, reaching
southern quebec on saturday and new england by sunday.


lhz361-182200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
948 am edt thu sep 18 2025

.rest of today...north winds 5 to 10 knots in the late morning
and early afternoon becoming light and variable. widespread dense
fog late in the morning...then areas of fog in the afternoon.
waves 2 feet or less. 
.tonight...light and variable winds becoming northeast 5 to
10 knots late in the evening...then increasing to 10 to 15 knots
after midnight. waves 2 feet or less. 
.friday...northeast winds 10 to 15 knots becoming east 5 to
10 knots in the late morning and afternoon. waves 1 to 3 feet. 
.friday night...east winds 5 to 10 knots increasing to 15 to
20 knots after midnight. waves 2 feet or less building to 2 to
4 feet after midnight. 
.saturday...east winds 15 to 20 knots with gusts to around
30 knots becoming southeast 10 to 15 knots late in the evening. a
chance of showers late in the evening. waves 3 to 5 feet. 
.sunday...southeast winds 10 to 15 knots decreasing to 5 to
10 knots until early morning. a chance of showers early in the
morning...then showers likely until early morning. waves 2 to
4 feet subsiding to 1 to 3 feet in the late evening and early
morning. 
.monday...south winds 5 to 10 knots until afternoon becoming
light and variable. a chance of showers. a chance of
thunderstorms in the late morning and early afternoon. waves
2 feet or less. 


$$

fzus63 kmkx 181419
glflm 
expires:202509182130;;194692

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
919 am cdt thu sep 18 2025

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...

light to modest northeast winds over the northern half of the 
lake will gradually expand into the southern half of the lake this
afternoon with the passage of a weak backdoor cold front. light 
to modest northeast winds are then expected tonight becoming 
easterly on friday. breezy east to southeast winds will then 
prevail friday night through saturday morning as canadian high 
pressure strengthens to around 30.4 inches as it moves into the
lower great lakes and southern quebec, and as low pressure around
29.9 inches moves from the eastern dakotas into minnesota. 
intermittent showers and thunderstorms are expected friday night 
through sunday.



lmz080-669-671-673-675-777-779-870-872-874-876-878-182130-
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-
919 am cdt thu sep 18 2025

sheboygan wi to pentwater mi south...

.rest of today...light and variable winds 10 knots or less
becoming northeast in the afternoon. waves 1 to 2 ft.
.tonight...northeast winds 10 to 15 kt becoming east. waves 1 to
3 ft. 
.friday...east winds 10 to 15 kt becoming northeast. waves 1 to
3 ft. 
.friday night...east winds 10 to 20 kt becoming southeast 15 to
25 kt. waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft. 
.saturday...southeast winds 10 to 20 kt. chance of showers in the
afternoon. waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft. 
.saturday night...southeast winds 10 to 15 kt increasing to 10 to
20 kt. chance of showers. waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...southwest winds 10 to 20 kt becoming south. chance of
showers. waves 1 to 3 ft.  

$$

fzus63 kmkx 181419
glflm 
expires:202509182130;;194691

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
919 am cdt thu sep 18 2025

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...

light to modest northeast winds over the northern half of the 
lake will gradually expand into the southern half of the lake this
afternoon with the passage of a weak backdoor cold front. light 
to modest northeast winds are then expected tonight becoming 
easterly on friday. breezy east to southeast winds will then 
prevail friday night through saturday morning as canadian high 
pressure strengthens to around 30.4 inches as it moves into the
lower great lakes and southern quebec, and as low pressure around
29.9 inches moves from the eastern dakotas into minnesota. 
intermittent showers and thunderstorms are expected friday night 
through sunday.



lmz261-362-364-366-563-565-567-868-182130-
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-
919 am cdt thu sep 18 2025

sheboygan wi to pentwater mi north...

.rest of today...north winds 5 to 10 kt increasing to 10 to
15 kt. patchy fog late this morning. isolated showers. waves 1 to
2 ft. 
.tonight...north winds 10 to 15 kt becoming east. waves 1 to
3 ft. 
.friday...east winds 10 to 15 kt becoming northeast 10 to 20 kt.
waves 2 to 4 ft. 
.friday night...east winds 15 to 25 kt becoming southeast. waves
2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.
.saturday...southeast winds 10 to 20 kt increasing to 15 to
25 kt. chance of showers. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...southeast winds 10 to 20 kt. chance of showers.
waves 2 to 4 ft. 
.sunday...south winds 10 to 20 kt. chance of showers. waves 2 to
4 ft. 
.monday...southwest winds 10 to 15 kt increasing to 10 to 20 kt.
chance of showers. waves 1 to 3 ft.  

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193737

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt thu sep 18 2025

.rest of today...northeast winds 10 to 20 knots. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. waves subsiding to calm to 2 feet, then
building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves 2 to 4 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers
and a slight chance of thunderstorms. waves building to 3 to
6 feet occasionally to 8 feet. 
.saturday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. a chance of showers. waves
subsiding to 2 to 4 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
subsiding to calm to 2 feet. 
.monday...south winds 5 to 15 knots veering southwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193738

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt thu sep 18 2025

.rest of today...northeast winds 10 to 20 knots. waves 1 to
3 feet subsiding to calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 1 to 3 feet. 
.friday...east winds 15 to 25 knots. waves building to 2 to
4 feet. 
.friday night...east winds 15 to 25 knots veering southeast after
midnight. a slight chance of showers after midnight. waves 2 to
4 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves subsiding to 1 to 3 feet. 
.saturday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers through midnight. showers
likely after midnight. waves subsiding to calm to 2 feet. 
.sunday...south winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193739

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



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-
1001 am edt thu sep 18 2025

.rest of today...northeast winds 10 to 20 knots. waves 1 to
3 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 2 to 4 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. waves subsiding to 1 to 3 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. a slight chance of showers after
midnight. waves building to 3 to 5 feet occasionally to 7 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 10 to 20 knots veering south
after midnight. a chance of showers through midnight. showers
likely after midnight. waves subsiding to 2 to 4 feet. 
.sunday...south winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of showers. waves subsiding to calm to 2 feet.
.monday...south winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193740

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt thu sep 18 2025

.rest of today...northeast winds 10 to 20 knots backing north in
the afternoon. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...northeast winds 10 to 20 knots veering east after
midnight. waves building to 1 to 3 feet. 
.friday...east winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing northeast late. waves subsiding to
calm to 2 feet. 
.friday night...east winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...southeast winds 15 to 25 knots. a slight chance of
showers. waves 2 to 4 feet. 
.saturday night...southeast winds 15 to 25 knots. a chance of
showers through midnight. showers likely after midnight. waves
2 to 4 feet. 
.sunday...southeast winds 10 to 20 knots veering south. showers
likely and a chance of thunderstorms. waves subsiding to calm to
2 feet. 
.monday...south winds 10 to 20 knots. a chance of showers. waves
calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193735

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt thu sep 18 2025 /901 am cdt thu sep 18 2025/

.rest of today...northeast winds 20 to 30 knots becoming east
15 to 25 knots late. a slight chance of showers. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots. a slight chance of showers
and thunderstorms. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.friday...east winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. a slight chance of thunderstorms through early
afternoon. a chance of showers. waves building to 5 to 8 feet
occasionally to 10 feet. 
.friday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms. waves subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots. showers likely and a
slight chance of thunderstorms. waves subsiding to calm to
2 feet. 
.saturday night...southeast winds 5 to 15 knots veering south
after midnight. showers likely through midnight. a chance of
thunderstorms. a chance of showers after midnight. waves calm to
2 feet. 
.sunday...south winds 5 to 15 knots backing northeast. a chance
of showers. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots backing north. waves calm to
2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202509182000;;193736

open lake forecast for lake superior
national weather service marquette mi
1001 am edt thu sep 18 2025

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 30.3 inch high over manitoba shifts over northern ontario through 
friday and strengthens to 30.4 inches on saturday over eastern 
ontario and western quebec. the 30.4 inch high will move to new 
england by sunday morning. this brings 30.2 inch ridging back over 
lake superior late today and friday, weakening to 30.1 inches by the 
end of the day saturday. troughing then begins to spread over lake 
superior sunday into the beginning of next week as low pressure 
deepens over the canadian prairie to around 29.5 inches.



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-
1001 am edt thu sep 18 2025

.rest of today...northeast winds 10 to 20 knots increasing to
15 to 25 knots late. a slight chance of showers. waves 3 to
6 feet occasionally to 8 feet. 
.tonight...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a slight chance of showers and
thunderstorms. waves subsiding to 2 to 4 feet. 
.friday...east winds 15 to 25 knots. a slight chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of showers and a slight chance
of thunderstorms. waves subsiding to 2 to 4 feet. 
.saturday...southeast winds 10 to 20 knots. showers likely and a
slight chance of thunderstorms. waves building to 3 to 5 feet
occasionally to 7 feet. 
.saturday night...southeast winds 5 to 15 knots veering south
after midnight. showers likely through midnight. a chance of
showers after midnight. waves subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. a chance of showers. waves
subsiding to calm to 2 feet. 
.monday...southwest winds 5 to 15 knots veering north. waves calm
to 2 feet. 

$$