fzus61 kbuf 170804
glflo 
expires:202604171500;;510992

open lake forecast for lake ontario
national weather service buffalo ny
403 am edt fri apr 17 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 30.0 inch high will build across the lower great lakes 
today, and new england tonight. a 29.4 inch low near lake superior 
friday evening will move to james bay and deepen to 29.0 inches 
saturday, while pushing a trailing strong cold front across the lake 
later saturday and saturday evening. a 30.4 inch high will then 
settle southeastward across the great lakes sunday through monday 
night, before sliding off the mid-atlantic coast tuesday. a 29.9 
inch trough will move across the lake tuesday night before a 30.1 
inch high moves across the great lakes region wednesday.


loz063>065-171500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 am edt fri apr 17 2026

.today...north winds 5 to 10 knots becoming northwest. areas of
fog through early afternoon. waves 2 feet or less. 
.tonight...west winds 10 knots or less becoming southeast 10 to
15 knots. waves 1 foot or less. 
.saturday...southeast winds 15 to 20 knots becoming south.
showers in the afternoon. waves 1 to 3 feet building to 3 to
5 feet. 
.saturday night...south winds 15 to 20 knots becoming west. rain
showers. waves 3 to 5 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. rain
showers during the day. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
3 to 6 feet subsiding to 2 to 4 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. a
chance of rain showers tuesday night. waves 1 to 3 feet building
to 2 to 4 feet. 

$$

fzus61 kbuf 170804
glflo 
expires:202604171500;;510991

open lake forecast for lake ontario
national weather service buffalo ny
403 am edt fri apr 17 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 30.0 inch high will build across the lower great lakes 
today, and new england tonight. a 29.4 inch low near lake superior 
friday evening will move to james bay and deepen to 29.0 inches 
saturday, while pushing a trailing strong cold front across the lake 
later saturday and saturday evening. a 30.4 inch high will then 
settle southeastward across the great lakes sunday through monday 
night, before sliding off the mid-atlantic coast tuesday. a 29.9 
inch trough will move across the lake tuesday night before a 30.1 
inch high moves across the great lakes region wednesday.


loz062-171500-
lake ontario open waters from the niagara river to hamlin beach-
404 am edt fri apr 17 2026

.today...northwest winds 10 knots or less becoming east. areas of
fog through early afternoon. waves 1 foot or less. 
.tonight...east winds 10 knots or less becoming southeast. waves
1 foot or less. 
.saturday...southeast winds 10 to 15 knots becoming southwest
15 to 20 knots. a chance of showers in the morning, then showers
in the afternoon. waves 1 to 3 feet building to 2 to 4 feet. 
.saturday night...west winds 15 to 20 knots becoming northwest.
rain showers in the evening, then rain showers likely overnight.
waves 3 to 5 feet. 
.sunday...west winds 15 to 20 knots becoming northwest. a chance
of rain showers. waves 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet. 

$$

fzus61 kcle 170735
glfle 
expires:202604171415;;510017

open lake forecast for lake erie
national weather service cleveland oh
335 am edt fri apr 17 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 build in briefly today. early 
saturday morning, a warm front will move north across the lake as 
low pressure 29.70 inches moves through the great lakes region and
will drag a cold front through that evening. a trough averaging 
29.90 inches will linger over lake erie on sunday and high 
pressure 30.30 inches will build in sunday evening.


lez061-165>169-171415-
ripley to buffalo ny extending from 5nm 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-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
335 am edt fri apr 17 2026

...dense fog advisory in effect until 11 am edt this morning...

.today...northwest winds less than 10 knots. widespread dense fog
this morning. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a slight chance of showers and thunderstorms late.
waves 1 to 3 feet. 
.saturday...south winds 15 to 20 knots becoming southwest.
showers with a chance of thunderstorms. waves 1 to 3 feet
building to 2 to 4 feet. 
.saturday night...west winds 15 to 20 knots becoming northwest.
rain showers in the evening, then a chance of rain showers
overnight. waves 2 to 4 feet. 
.sunday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of rain showers during the day. waves 3 to
5 feet. 
.monday...northwest winds 5 to 15 knots becoming south 15 to
20 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. waves
3 to 5 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 170735
glfle 
expires:202604171415;;510016

open lake forecast for lake erie
national weather service cleveland oh
335 am edt fri apr 17 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 build in briefly today. early 
saturday morning, a warm front will move north across the lake as 
low pressure 29.70 inches moves through the great lakes region and
will drag a cold front through that evening. a trough averaging 
29.90 inches will linger over lake erie on sunday and high 
pressure 30.30 inches will build in sunday evening.


lez162>164-171415-
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 fri apr 17 2026

...dense fog advisory in effect until 11 am edt this morning...

.today...northeast winds 10 knots or less becoming east.
widespread dense fog this morning. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming south 15 to
20 knots. a slight chance of showers and thunderstorms after
midnight. showers likely with a chance of thunderstorms late.
waves 2 feet or less. 
.saturday...south winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms in the morning, then showers in
the afternoon. waves 1 to 3 feet. 
.saturday night...west winds 15 to 20 knots becoming northwest. a
chance of showers. waves 2 to 4 feet. 
.sunday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 2 to 4 feet. 
.monday...northwest winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming southwest. waves
2 to 4 feet subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 170749
glfsc 
expires:202604171600;;510484

lake st clair forecast
national weather service detroit/pontiac mi
349 am edt fri apr 17 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...fog lingers through the morning with high pressure,
30.00 inches, crossing the region. a powerful cold front arrives
on saturday, bringing another round of showers and storms in
addition to stronger winds for the weekend.


lcz460-171600-
lake st clair-
349 am edt fri apr 17 2026

...dense fog advisory in effect until 10 am edt this morning...

.today...light and variable winds becoming southeast 5 to 10 knots
late in the afternoon. partly sunny. widespread dense fog early in
the morning...then areas of dense fog late in the morning. waves 2
feet or less.
.tonight...southeast winds 10 to 15 knots becoming south 15 to 20
knots early in the morning. partly cloudy ...then showers and a
chance of thunderstorms early in the morning. waves 2 feet or less.
.saturday...south winds 15 to 20 knots veering to the west early in
the afternoon. a chance of thunderstorms early in the morning. rain
showers until late afternoon...then a chance of light showers early
in the afternoon. waves 1 to 3 feet.
.saturday night...west winds 15 to 20 knots diminishing to 10 to 15
knots after midnight. mostly cloudy early in the evening becoming
partly cloudy. a chance of light showers . waves 1 to 3 feet.
.sunday...northwest winds 15 to 20 knots. mostly sunny in the
morning...then partly cloudy with a chance of light showers in the
afternoon and evening. waves 1 to 3 feet.
.monday...southeast winds 10 to 15 knots. mostly clear. waves 2 feet
or less.
.tuesday...southwest winds 15 to 20 knots. partly cloudy. waves 2 to
4 feet.

$$

fzus63 kdtx 170749
glflh 
expires:202604171600;;510481

open lake forecast for lake huron
national weather service detroit/pontiac mi
349 am edt fri apr 17 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...fog lingers through the morning with high pressure, 
30.00 inches, crossing the region. a powerful cold front arrives 
on saturday, bringing another round of showers and storms in 
addition to stronger winds for the weekend.


lhz361-362-171600-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
349 am edt fri apr 17 2026

...dense fog advisory in effect until 10 am edt this morning...

.today...light and variable winds becoming east 5 to 10 knots
late in the morning...then increasing to 10 to 15 knots in the
afternoon. widespread dense fog in the morning. waves 2 feet or
less building to 3 to 5 feet late in the afternoon. 
.tonight...east winds 15 to 20 knots becoming southeast 20 to
25 knots with gusts to around 30 knots after midnight. a chance
of showers and thunderstorms after midnight. waves 5 to 7 feet
building to 6 to 9 feet early in the morning. waves occasionally
around 12 feet. 
.saturday...south winds 20 to 25 knots with gusts to around
30 knots becoming west 15 to 20 knots early in the afternoon.
showers likely and a chance of thunderstorms in the morning.
waves 8 to 12 feet. waves occasionally around 15 feet. 
.saturday night...west winds 15 to 20 knots. waves 6 to 9 feet.
waves occasionally around 12 feet. 
.sunday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots late in the evening. waves
8 to 12 feet. waves occasionally around 15 feet. 
.monday...northwest winds 10 to 15 knots becoming west 5 to
10 knots in the late morning and early afternoon...then becoming
southwest 10 to 15 knots early in the evening becoming south
15 to 20 knots by midnight. waves 6 to 9 feet subsiding to 4 to
6 feet in the late morning and early afternoon...then subsiding
to 1 to 3 feet early in the evening building to 6 to 9 feet by
midnight. waves occasionally around 12 feet. 
.tuesday...south winds 20 to 25 knots with gusts to around
30 knots becoming southwest 15 to 20 knots early in the evening...
then becoming west 10 to 15 knots by midnight. waves 8 to 12 feet
subsiding to 4 to 6 feet by midnight. waves occasionally around
15 feet. 


$$

fzus63 kdtx 170749
glflh 
expires:202604171600;;510482

open lake forecast for lake huron
national weather service detroit/pontiac mi
349 am edt fri apr 17 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...fog lingers through the morning with high pressure, 
30.00 inches, crossing the region. a powerful cold front arrives 
on saturday, bringing another round of showers and storms in 
addition to stronger winds for the weekend.


lhz363-462>464-171600-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
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-
349 am edt fri apr 17 2026

...dense fog advisory in effect until 10 am edt this morning...

.today...light and variable winds becoming east 5 to 10 knots in
the afternoon. widespread dense fog in the morning. waves 2 feet
or less. 
.tonight...east winds 10 to 15 knots becoming southeast 20 to
25 knots with gusts to around 30 knots. a chance of showers after
midnight. waves 1 to 3 feet building to 5 to 7 feet. waves
occasionally around 10 feet. 
.saturday...south winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots in the late morning and
early afternoon...then veering to the west early in the
afternoon. showers likely in the morning...then a chance of
showers in the afternoon. waves 6 to 9 feet. waves occasionally
around 12 feet. 
.saturday night...west winds 10 to 15 knots increasing to 15 to
20 knots in the late evening and overnight. a chance of showers
in the evening. waves 5 to 7 feet. waves occasionally around
10 feet. 
.sunday...northwest winds 15 to 20 knots. waves 6 to 9 feet
building to 8 to 12 feet late in the afternoon. waves
occasionally around 15 feet. 
.monday...northwest winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and early afternoon...then veering
to the north early in the evening becoming south 15 to 20 knots
by midnight. waves 6 to 9 feet subsiding to 2 to 4 feet early in
the evening...then building to 4 to 6 feet by midnight. waves
occasionally around 12 feet. 
.tuesday...south winds 20 to 25 knots with gusts to around
30 knots becoming southwest 10 to 15 knots. waves 6 to 9 feet
subsiding to 3 to 5 feet by midnight. waves occasionally around
12 feet. 


$$

fzus63 kmkx 170825
glflm 
expires:202604171515;;512314

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
325 am cdt fri apr 17 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...

winds remain light and variable overnight as a weak surface ridge
moves over the lake. dense fog will continue over the lake 
through this time. winds then come around to southerly this 
morning as a surface low of 29.5 inches approaches from the 
central plains. this surface low will quickly move from omaha to 
duluth from this morning into the afternoon. winds will become 
gusty and southeasterly tonight, and strong to severe storms will 
move east over the lake as a cold front sweeps through the area. 
winds then become northwesterly behind the cold front saturday 
morning. breezy northwesterly winds then continue saturday through
sunday as the low then races northeast toward hudson bay. winds 
ease monday morning as high pressure move southeast over the upper
great lakes.


lmz261-362-364-366-563-565-567-868-171515-
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-
325 am cdt fri apr 17 2026

sheboygan wi to pentwater mi north...

...dense fog advisory in effect until 7 pm cdt this evening...

.today...southeast winds 10 to 15 kt increasing to 30 kt.
widespread dense fog this morning, then patchy dense fog this
afternoon. waves 1 to 2 ft building to 4 to 6 ft occasionally to
8 ft. 
.tonight...southeast winds to 30 kt veering to southwest 15 to
25 kt. patchy fog. rain showers and thunderstorms likely in the
evening, then chance of rain showers and thunderstorms overnight.
waves 5 to 8 ft occasionally to 10 ft. 
.saturday...northwest winds to 30 kt becoming west 15 to 25 kt.
chance of rain showers in the morning. waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft. 
.saturday night...northwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday...northwest winds to 30 kt. waves 3 to 5 ft. 
.sunday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 2 to 4 ft. 
.monday...southwest winds 10 to 15 kt becoming south 10 to 20 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.tuesday...southwest winds to 30 kt diminishing to 15 to 25 kt.
waves 7 to 10 ft occasionally to 13 ft.  

$$

fzus63 kmkx 170825
glflm 
expires:202604171515;;512315

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
325 am cdt fri apr 17 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...

winds remain light and variable overnight as a weak surface ridge
moves over the lake. dense fog will continue over the lake 
through this time. winds then come around to southerly this 
morning as a surface low of 29.5 inches approaches from the 
central plains. this surface low will quickly move from omaha to 
duluth from this morning into the afternoon. winds will become 
gusty and southeasterly tonight, and strong to severe storms will 
move east over the lake as a cold front sweeps through the area. 
winds then become northwesterly behind the cold front saturday 
morning. breezy northwesterly winds then continue saturday through
sunday as the low then races northeast toward hudson bay. winds 
ease monday morning as high pressure move southeast over the upper
great lakes.


lmz080-669-671-673-675-777-779-870-872-874-876-878-171515-
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-
325 am cdt fri apr 17 2026

sheboygan wi to pentwater mi south...

...dense fog advisory in effect until 7 pm cdt this evening...

.today...southeast winds 10 to 15 kt increasing to 30 kt.
widespread dense fog this morning, then patchy dense fog this
afternoon. waves 1 ft or less building to 4 to 6 ft occasionally
to 8 ft. 
.tonight...south winds to 30 kt veering to southwest 15 to 25 kt.
patchy fog. chance of rain showers and thunderstorms in the
evening, then thunderstorms likely with a chance of rain showers
overnight. a few strong to severe thunderstorms possible. waves 4
to 7 ft occasionally to 9 ft.
.saturday...west winds to 30 kt diminishing to 10 to 20 kt.
chance of rain showers in the morning. waves 4 to 7 ft
occasionally to 9 ft. 
.saturday night...west winds 15 to 25 kt. waves 4 to 7 ft
occasionally to 9 ft. 
.sunday...northwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft. 
.sunday night...north winds 10 to 20 kt diminishing to 10 to
15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft. 
.monday...southeast winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.tuesday...south winds to 30 kt diminishing to 15 to 25 kt. waves
6 to 9 ft occasionally to 12 ft.  

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510789

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz266-172000-
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-
400 am edt fri apr 17 2026

...gale warning in effect from 3 pm edt this afternoon through
this evening...
...gale watch in effect from late tonight through saturday
evening...

.early this morning...southeast winds 10 to 20 knots. areas of
dense fog. waves 2 to 4 feet. 
.today...southeast winds 20 to 30 knots becoming south gales to
35 knots late. patchy fog through early afternoon. a slight
chance of rain showers by mid afternoon. waves building to 7 to
10 feet occasionally to 13 feet. 
.tonight...south gales to 40 knots becoming west gales to
35 knots after midnight, then veering northwest late. rain
showers likely and a chance of thunderstorms through midnight,
then a chance of rain showers, possibly mixed with snow after
midnight. waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet. 
.saturday...northwest gales to 35 knots backing west in the
afternoon. a slight chance of rain showers, snow showers and
sleet through early afternoon. waves building to 9 to 12 feet
occasionally to 15 feet. 
.saturday night...northwest gales to 35 knots. a slight chance of
snow showers through midnight. waves subsiding to 8 to 11 feet
occasionally to 14 feet. 
.sunday...northwest winds 20 to 30 knots. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...south winds 20 to 30 knots increasing to gales to
40 knots. waves subsiding to calm to 2 feet, then building to
7 to 10 feet occasionally to 13 feet. 
.tuesday...west winds 20 to 30 knots becoming north 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510790

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz267-172000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt fri apr 17 2026

...gale watch in effect from late tonight through saturday
evening...

.early this morning...southeast winds 5 to 15 knots. areas of
dense fog. waves calm to 2 feet. 
.today...southeast winds 10 to 20 knots increasing to 20 to
30 knots. patchy fog through early afternoon. waves building to
4 to 7 feet occasionally to 9 feet. 
.tonight...southeast winds 20 to 30 knots veering west late. rain
showers likely through midnight. a chance of thunderstorms. a
chance of rain showers, possibly mixed with snow after midnight.
waves subsiding to 3 to 6 feet occasionally to 8 feet, then
building to 7 to 10 feet occasionally to 13 feet. 
.saturday...northwest gales to 35 knots becoming west gales to
40 knots in the afternoon. a slight chance of rain and snow
showers, possibly mixed with sleet through early afternoon. waves
building to 10 to 14 feet occasionally to 18 feet. 
.saturday night...west gales to 35 knots veering northwest after
midnight. a slight chance of snow showers through midnight. waves
subsiding to 8 to 11 feet occasionally to 14 feet. 
.sunday...northwest gales to 35 knots. waves subsiding to 6 to
9 feet occasionally to 11 feet. 
.sunday night...northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots increasing to gales to
35 knots. waves subsiding to calm to 2 feet, then building to
5 to 8 feet occasionally to 10 feet. 
.tuesday...west winds 20 to 30 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510786

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz263-172000-
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-
400 am edt fri apr 17 2026

...gale watch in effect from late tonight through saturday
evening...

.early this morning...east winds 10 to 20 knots. patchy dense
fog. a slight chance of rain showers. waves 2 to 4 feet. 
.today...southeast winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming south 15 to 25 knots
late. patchy dense fog through early afternoon. rain showers
likely and a chance of thunderstorms by mid afternoon. waves
building to 4 to 7 feet occasionally to 9 feet. 
.tonight...west winds 15 to 25 knots increasing to 20 to 30 knots
after midnight. a chance of rain showers and a slight chance of
thunderstorms through midnight. waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.saturday...west winds 20 to 30 knots increasing to gales to
35 knots late. waves building to 8 to 11 feet occasionally to
14 feet. 
.saturday night...northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering north after
midnight. waves calm to 2 feet. 
.monday...south winds 15 to 25 knots becoming southwest 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots becoming east 5 to 15 knots.
waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510787

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz264-172000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt fri apr 17 2026

...gale warning in effect from 3 pm edt this afternoon through
this evening...
...gale watch in effect from late tonight through saturday
evening...

.early this morning...east winds 10 to 20 knots. areas of dense
fog. a slight chance of rain showers. waves 2 to 4 feet building
to 3 to 5 feet occasionally to 7 feet. 
.today...southeast winds 15 to 25 knots increasing to gales to
35 knots. patchy dense fog through early afternoon. a chance of
showers and thunderstorms by mid afternoon. waves building to
8 to 11 feet occasionally to 14 feet. 
.tonight...south gales to 35 knots becoming west 20 to 30 knots
after midnight, then veering northwest late. rain showers and a
chance of thunderstorms through midnight, then a slight chance of
rain and snow showers after midnight. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.saturday...west winds 20 to 30 knots. waves building to 8 to
11 feet occasionally to 14 feet. 
.saturday night...northwest winds 20 to 30 knots. waves subsiding
to 5 to 8 feet occasionally to 10 feet. 
.sunday...northwest winds 15 to 25 knots. waves subsiding to 1 to
3 feet. 
.sunday night...northwest winds 5 to 15 knots veering north after
midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 15 to 25 knots increasing to 20 to
30 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 15 to 25 knots becoming northeast 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510785

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz162-172000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt fri apr 17 2026 /300 am cdt fri apr 17 2026/

.early this morning...east winds 10 to 20 knots. waves 1 to
3 feet building to 2 to 4 feet. 
.today...east winds 10 to 20 knots backing northeast in the
afternoon, then becoming northwest 15 to 25 knots late. rain
showers and a chance of thunderstorms by mid afternoon. waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.tonight...west winds 15 to 25 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible. a slight chance of
rain showers through midnight. waves subsiding to 2 to 4 feet,
then building to 3 to 6 feet occasionally to 8 feet. 
.saturday...west winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots late. waves
building to 4 to 7 feet occasionally to 9 feet. 
.saturday night...northwest winds 15 to 25 knots. waves subsiding
to 1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.sunday night...northwest winds 5 to 15 knots veering north after
midnight. waves calm to 2 feet. 
.monday...south winds 10 to 20 knots becoming southwest 20 to
30 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.tuesday...west winds 10 to 20 knots becoming northeast 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 170801
glfls 
expires:202604172000;;510788

open lake forecast for lake superior
national weather service marquette mi
400 am edt fri apr 17 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 low of around 29.4 inches moves across lake superior late this 
afternoon through this evening. behind it, ridging builds over the 
lake, strengthening to about 30.3 inches sunday night into monday 
morning. this ridging quickly gives way to 29.8 inch troughing 
monday night into tuesday morning as a weakening low swings from the 
hudson bay shoreline of far northern ontario into james bay. high 
pressure ridging builds back to 30.2 inches over lake superior by 
tuesday night.



lsz265-172000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt fri apr 17 2026

...gale warning in effect from 3 pm edt this afternoon through
this evening...
...gale watch in effect from late tonight through saturday
evening...

.early this morning...southeast winds 10 to 20 knots. patchy fog.
waves 1 to 3 feet. 
.today...southeast winds 15 to 25 knots increasing to gales to
35 knots. a slight chance of showers and thunderstorms by mid
afternoon. waves building to 6 to 9 feet occasionally to 11 feet.
.tonight...south gales to 40 knots becoming west gales to
35 knots after midnight. rain showers and a chance of
thunderstorms through midnight, then a chance of rain showers,
possibly mixed with snow after midnight. waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.saturday...west gales to 40 knots. waves building to 6 to 9 feet
occasionally to 11 feet. 
.saturday night...northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.sunday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.sunday night...northwest winds 10 to 20 knots. waves subsiding
to calm to 2 feet. 
.monday...southeast winds 15 to 25 knots becoming south gales to
35 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...northwest winds 15 to 25 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$