fzus61 kbuf 181410
glflo 
expires:202604182100;;583290

open lake forecast for lake ontario
national weather service buffalo ny
1009 am edt sat apr 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 30.0 inch high will push northeast across the 
canadian maritimes today. meanwhile, a 29.4 inch low north of lake 
superior today will move to james bay and deepen to 29.0 inches, 
while pushing a trailing strong cold front across the lake this 
afternoon and evening. a 30.4 inch high will then settle southeast 
across the great lakes sunday through monday night, before sliding 
off the mid-atlantic coast tuesday. a 29.4 inch low over lower 
hudson bay tuesday, will weaken to 29.9 inches by wednesday, while 
pushing an attendant weak cold front across the lake tuesday night. 
a 30.2 inch high will then build across the great lakes region 
wednesday and thursday.


loz063>065-182100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1009 am edt sat apr 18 2026

.this afternoon...southeast winds 15 to 20 knots becoming south.
showers likely late. waves 2 to 4 feet building to 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers with a chance of thunderstorms
early, then rain showers from late evening on. some thunderstorms
may produce gusty winds early. waves 3 to 5 feet subsiding to
2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
rain and snow showers likely in the morning, then a chance of
snow showers in the afternoon. waves 1 to 3 feet building to 3 to
6 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest.
waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 3 to 6 feet subsiding to 1 to
3 feet. 
.tuesday...south winds 10 to 15 knots becoming west. a chance of
rain showers. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots. waves 1 to 3 feet
subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 181410
glflo 
expires:202604182100;;583289

open lake forecast for lake ontario
national weather service buffalo ny
1009 am edt sat apr 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 30.0 inch high will push northeast across the 
canadian maritimes today. meanwhile, a 29.4 inch low north of lake 
superior today will move to james bay and deepen to 29.0 inches, 
while pushing a trailing strong cold front across the lake this 
afternoon and evening. a 30.4 inch high will then settle southeast 
across the great lakes sunday through monday night, before sliding 
off the mid-atlantic coast tuesday. a 29.4 inch low over lower 
hudson bay tuesday, will weaken to 29.9 inches by wednesday, while 
pushing an attendant weak cold front across the lake tuesday night. 
a 30.2 inch high will then build across the great lakes region 
wednesday and thursday.


loz062-182100-
lake ontario open waters from the niagara river to hamlin beach-
1009 am edt sat apr 18 2026

.this afternoon...south winds 15 to 20 knots becoming southwest.
showers likely early. showers with a chance of
thunderstorms late. some thunderstorms may produce gusty winds
late. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers likely. waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain and snow showers in the afternoon. waves 1 to
3 feet building to 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest. a
chance of rain showers in the evening. waves 3 to 5 feet. 
.monday...northwest winds 15 to 20 knots becoming southwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of rain showers. waves 1 to 3 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet. 
.wednesday...north winds 10 knots or less. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181352
glfle 
expires:202604182015;;582570

open lake forecast for lake erie
national weather service cleveland oh
952 am edt sat apr 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...
low pressure 29.40 inches will drag a cold front east through the
great lakes and ohio valley this evening. a trough averaging 
29.90 inches moves across the lake on sunday before high pressure
30.40 inches moves overhead sunday night into monday.


lez061-169-182015-
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-
952 am edt sat apr 18 2026

.rest of today...south winds 15 to 20 knots becoming southwest. a
slight chance of showers late this morning, then a chance of
showers with a slight chance of thunderstorms early this
afternoon. showers with a chance of thunderstorms late. waves
2 to 4 feet. 
.tonight...west winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of rain showers through the early overnight.
waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain and snow showers in the afternoon. waves 2 to
4 feet. 
.sunday night...west winds 10 to 15 knots becoming northwest. a
chance of rain showers in the evening. waves 2 to 4 feet
subsiding to 1 to 2 feet. 
.monday...northwest winds 5 to 10 knots becoming south. waves
1 to 2 feet. 
.tuesday...south winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.wednesday...north winds 10 knots or less becoming northeast.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181352
glfle 
expires:202604182015;;582568

open lake forecast for lake erie
national weather service cleveland oh
952 am edt sat apr 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...
low pressure 29.40 inches will drag a cold front east through the
great lakes and ohio valley this evening. a trough averaging 
29.90 inches moves across the lake on sunday before high pressure
30.40 inches moves overhead sunday night into monday.


lez162>164-182015-
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-
952 am edt sat apr 18 2026

.rest of today...southwest winds 15 to 20 knots becoming west.
showers likely with a slight chance of thunderstorms late this
morning, then showers with a chance of thunderstorms early this
afternoon. a slight chance of showers late. waves 1 to 3 feet
building to 2 to 4 feet. 
.tonight...west winds 15 to 20 knots. a slight chance of showers
early. waves 2 to 4 feet. 
.sunday...west winds 15 to 20 knots. a chance of showers in the
afternoon. waves 2 to 4 feet. 
.sunday night...northwest winds 15 to 20 knots becoming north
10 to 15 knots. a chance of rain showers in the evening. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.monday...north winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet. 
.wednesday...north winds 10 to 15 knots becoming east 10 knots or
less. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 181352
glfle 
expires:202604182015;;582569

open lake forecast for lake erie
national weather service cleveland oh
952 am edt sat apr 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...
low pressure 29.40 inches will drag a cold front east through the
great lakes and ohio valley this evening. a trough averaging 
29.90 inches moves across the lake on sunday before high pressure
30.40 inches moves overhead sunday night into monday.


lez165>168-182015-
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-
952 am edt sat apr 18 2026

.rest of today...south winds 15 to 20 knots becoming west. a
chance of showers with a slight chance of thunderstorms late this
morning, then showers with a chance of thunderstorms early this
afternoon. showers likely with a slight chance of thunderstorms
late. waves 2 to 4 feet. 
.tonight...west winds 15 to 20 knots. a slight chance of showers
early, then a chance of showers late in the evening. waves 2 to
4 feet. 
.sunday...west winds 15 to 20 knots. a chance of rain showers in
the afternoon. waves 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming north 10 to
15 knots. a chance of rain showers in the evening. waves 2 to
4 feet. 
.monday...northwest winds 5 to 15 knots becoming south. waves
1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots becoming east 10 knots or
less. waves 1 to 3 feet subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 181317
glfsc 
expires:202604182130;;581718

lake st clair forecast
national weather service detroit/pontiac mi
917 am edt sat apr 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...low pressure, 29.30 inches, lifting into northern
ontario drags a respectable cold front through the central great
lakes this morning supporting another round of showers and a few
thunderstorms. colder air filters into the region the rest of the
weekend maintaining moderate to strong northwesterly winds.


lcz460-182130-
lake st clair-
917 am edt sat apr 18 2026

.rest of today...southwest winds 10 to 15 knots becoming west 15 to
20 knots in the afternoon. light showers likely late in the
morning...then light showers early in the afternoon. waves 1 to 3
feet.
.tonight...west winds 15 to 20 knots diminishing to 10 to 15 knots
after midnight. partly cloudy. waves 1 to 3 feet.
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots
early in the afternoon. partly sunny. a chance of light showers
early in the afternoon. waves 1 to 3 feet.
.sunday night...northwest winds 15 to 20 knots becoming north 10 to
15 knots in the late evening and overnight. mostly clear. a chance
of light showers early in the evening. waves 2 feet or less.
.monday...northwest winds 10 to 15 knots diminishing to 5 to 10
knots in the afternoon...then veering to the southeast in the
evening. mostly clear. waves 2 feet or less.
.tuesday...west winds 15 to 20 knots. partly cloudy. waves 1 to 3
feet.
.wednesday...northeast winds 10 to 15 knots. mostly clear. waves 2
feet or less.

$$

fzus63 kdtx 181316
glflh 
expires:202604182130;;581711

open lake forecast for lake huron
national weather service detroit/pontiac mi
916 am edt sat apr 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...low pressure, 29.30 inches, lifting into northern
ontario drags a respectable cold front through the central great
lakes this morning supporting another round of showers and a few
thunderstorms. colder air filters into the region the rest of the
weekend maintaining moderate to strong northwesterly winds.


lhz361>363-182130-
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-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
916 am edt sat apr 18 2026

.rest of today...southwest winds 15 to 20 knots with gusts to
around 30 knots becoming west 10 to 15 knots late in the
afternoon. a chance of showers late in the morning. waves 8 to
12 feet. waves occasionally around 15 feet. 
.tonight...west winds 10 to 15 knots decreasing to 5 to 10 knots
after midnight. waves 4 to 6 feet. waves occasionally around
8 feet. 
.sunday...west winds 10 to 15 knots becoming northwest 15 to
20 knots with gusts to around 30 knots in the late morning and
afternoon. waves 5 to 7 feet. waves occasionally around 10 feet. 
.sunday night...northwest winds 20 to 25 knots with gusts to
around 30 knots decreasing to 15 to 20 knots after midnight.
waves 8 to 12 feet. waves occasionally around 15 feet. 
.monday...northwest winds 10 to 15 knots becoming west 5 to
10 knots late in the morning...then becoming southeast 10 to
15 knots late in the afternoon becoming south 15 to 20 knots late
in the evening. waves 4 to 6 feet subsiding to 1 to 3 feet late
in the afternoon...then building to 6 to 9 feet late in the
evening. waves occasionally around 12 feet. 
.tuesday...south winds 20 to 25 knots with gusts to around
30 knots becoming southwest 15 to 20 knots in the late morning
and early afternoon...then becoming south 10 to 15 knots early in
the evening veering to the northwest by midnight. waves 6 to
9 feet subsiding to 3 to 5 feet by midnight. waves occasionally
around 12 feet. 
.wednesday...north winds 10 to 15 knots becoming northeast 5 to
10 knots. waves 2 to 4 feet subsiding to 1 to 3 feet . 


$$

fzus63 kdtx 181316
glflh 
expires:202604182130;;581712

open lake forecast for lake huron
national weather service detroit/pontiac mi
916 am edt sat apr 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...low pressure, 29.30 inches, lifting into northern
ontario drags a respectable cold front through the central great
lakes this morning supporting another round of showers and a few
thunderstorms. colder air filters into the region the rest of the
weekend maintaining moderate to strong northwesterly winds.


lhz462>464-182130-
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-
916 am edt sat apr 18 2026

.rest of today...south winds 15 to 20 knots becoming southwest
10 to 15 knots early in the afternoon...then becoming west 5 to
10 knots late in the afternoon. a chance of showers. waves 4 to
6 feet. 
.tonight...west winds 5 to 10 knots increasing to 10 to 15 knots
late in the evening...then decreasing to 5 to 10 knots after
midnight. waves 2 to 4 feet. waves occasionally around 8 feet. 
.sunday...west winds 5 to 10 knots increasing to 10 to 15 knots
in the late morning and afternoon. a chance of snow showers in
the afternoon. waves 2 to 4 feet. 
.sunday night...northwest winds 15 to 20 knots. waves 6 to
9 feet. waves occasionally around 12 feet. 
.monday...northwest winds 10 to 15 knots decreasing to 5 to
10 knots late in the morning...then veering to the northeast late
in the afternoon becoming south 15 to 20 knots late in the
evening. waves 4 to 6 feet subsiding to 1 to 3 feet late in the
afternoon...then building to 4 to 6 feet late in the evening.
waves occasionally around 8 feet. 
.tuesday...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 decreasing to 10 to 15 knots early in the
evening backing to the south 10 to 15 knots by midnight. waves
6 to 9 feet subsiding to 3 to 5 feet . waves occasionally around
12 feet. 
.wednesday...north winds 10 to 15 knots decreasing to 5 to
10 knots. waves 2 to 4 feet subsiding to 1 to 3 feet . 


$$

fzus63 kmkx 181412
glflm 
expires:202604182115;;583638

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
912 am cdt sat apr 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...

breezy west northwest winds are expected today into tonight, as
strong low pressure around 29.0 inches continues to move well to
the northeast of the region, with high pressure around 30.2 inches
over south central canada. the high will move southeast across the
region sunday into monday, with winds gradually weakening. as the
high shifts east monday night into tuesday, breezy southerly 
winds should develop over the region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-182115-
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-
912 am cdt sat apr 18 2026

sheboygan wi to pentwater mi south...

.rest of today...northwest winds to 30 kt becoming west 15 to
25 kt. waves 4 to 6 ft occasionally to 8 ft. 
.tonight...west winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.sunday...west winds 10 to 20 kt becoming northwest. waves 3 to
5 ft. 
.sunday night...north winds 10 to 20 kt becoming northeast 10 to
15 kt. waves 2 to 4 ft. 
.monday...east winds 5 to 10 kt becoming southeast 10 to 20 kt in
the afternoon. waves 1 to 2 ft building to 2 to 4 ft. 
.monday night...southeast winds 15 to 25 kt becoming south to
30 kt. waves 4 to 7 ft occasionally to 9 ft. 
.tuesday...south winds to 30 kt diminishing to 10 to 20 kt. waves
4 to 7 ft occasionally to 9 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 2 to 4 ft.  

$$

fzus63 kmkx 181412
glflm 
expires:202604182115;;583637

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
912 am cdt sat apr 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...

breezy west northwest winds are expected today into tonight, as
strong low pressure around 29.0 inches continues to move well to
the northeast of the region, with high pressure around 30.2 inches
over south central canada. the high will move southeast across the
region sunday into monday, with winds gradually weakening. as the
high shifts east monday night into tuesday, breezy southerly 
winds should develop over the region.


lmz261-362-364-366-563-565-567-868-182115-
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-
912 am cdt sat apr 18 2026

sheboygan wi to pentwater mi north...

.rest of today...west winds 15 to 25 kt increasing to 30 kt.
waves 4 to 6 ft occasionally to 8 ft. 
.tonight...west winds to 30 kt diminishing to 15 to 25 kt. waves
4 to 6 ft occasionally to 8 ft. 
.sunday...west winds 15 to 25 kt becoming north. waves 2 to 4 ft.
.sunday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.monday...west winds 10 to 15 kt becoming south 10 to 20 kt.
waves 1 to 2 ft building to 2 to 4 ft. 
.monday night...south winds to 30 kt. waves 5 to 8 ft
occasionally to 10 ft. 
.tuesday...southwest winds to 30 kt diminishing to 10 to 20 kt.
waves 5 to 8 ft occasionally to 10 ft subsiding to 4 to 6 ft
occasionally to 8 ft. 
.wednesday...northeast winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 to 2 ft.  

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582810

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1000 am edt sat apr 18 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...west gales to 40 knots. a slight chance of snow
showers. waves 4 to 7 feet occasionally to 9 feet building to
6 to 9 feet occasionally to 11 feet. 
.tonight...west gales to 40 knots becoming northwest gales to
35 knots after midnight, then diminishing to 20 to 30 knots late.
a chance of snow showers. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.sunday...northwest winds 20 to 30 knots. waves subsiding to 3 to
6 feet occasionally to 8 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.monday...southwest winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.monday night...south gales to 35 knots veering southwest after
midnight. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 
.tuesday...northwest winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582811

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



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-
1000 am edt sat apr 18 2026

...gale warning in effect through this evening...

.rest of today...west gales to 35 knots. a slight chance of snow
showers. waves 7 to 10 feet occasionally to 13 feet building to
10 to 14 feet occasionally to 18 feet. 
.tonight...west gales to 35 knots veering northwest after
midnight. a chance of snow showers. waves subsiding to 8 to
11 feet occasionally to 14 feet. 
.sunday...northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then diminishing to 20 to 30 knots
late. waves subsiding to 6 to 9 feet occasionally to 11 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 2 to 4 feet. 
.monday...southwest winds 5 to 15 knots becoming south 20 to
30 knots by mid afternoon. waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.monday night...south gales to 40 knots veering southwest after
midnight. waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet. 
.tuesday...northwest winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582812

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1000 am edt sat apr 18 2026

...gale warning in effect from 2 pm this afternoon to 8 pm edt
this evening...

.rest of today...west gales to 40 knots. a slight chance of snow
showers. waves 8 to 11 feet occasionally to 14 feet subsiding to
7 to 10 feet occasionally to 13 feet, then building to 10 to
14 feet occasionally to 18 feet. 
.tonight...west gales to 35 knots veering northwest after
midnight. a chance of snow showers. 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 diminishing to
5 to 15 knots after midnight. waves subsiding to 2 to 4 feet. 
.monday...west winds 5 to 15 knots becoming south 15 to 25 knots
by mid afternoon. waves subsiding to calm to 2 feet, then
building to 1 to 3 feet. 
.monday night...south gales to 35 knots veering southwest after
midnight. waves building to 5 to 9 feet occasionally to 11 feet. 
.tuesday...west winds 15 to 25 knots becoming northwest 5 to
15 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 15 to
25 knots. waves building to 2 to 4 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582807

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt sat apr 18 2026 /900 am cdt sat apr 18 2026/

.rest of today...west winds to 30 knots with a few gale force
gusts to 35 knots possible. a slight chance of freezing rain by
late morning. a slight chance of snow showers. a slight chance of
rain showers by mid afternoon. waves 4 to 8 feet occasionally to
10 feet. 
.tonight...west winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight. waves subsiding to 2 to 4 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the 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 increasing to 15 to 25 knots
by mid afternoon. waves building to 2 to 4 feet. 
.monday night...southwest winds 15 to 25 knots veering west after
midnight. waves subsiding to 1 to 3 feet. 
.tuesday...west winds 5 to 15 knots veering northeast. waves
subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots increasing to 10 to
20 knots. a chance of rain showers. waves building to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582808

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



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-
1000 am edt sat apr 18 2026

...gale warning in effect until 8 pm edt this evening...

.rest of today...west winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. a slight chance of snow showers. waves
6 to 9 feet occasionally to 11 feet building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 8 to 11 feet
occasionally to 14 feet. 
.tonight...west winds 20 to 30 knots veering northwest after
midnight, then diminishing to 15 to 25 knots late. flurries
through midnight. waves subsiding to 4 to 7 feet occasionally to
9 feet. 
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. waves subsiding to 1 to 3 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...southwest winds 15 to 25 knots backing south by mid
afternoon. waves building to 3 to 5 feet occasionally to 7 feet. 
.monday night...southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. waves building to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...west winds 10 to 20 knots becoming east less than
10 knots. waves subsiding to calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming southeast 15 to
25 knots. a chance of rain showers. waves building to 3 to 5 feet
occasionally to 7 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202604182000;;582809

open lake forecast for lake superior
national weather service marquette mi
1000 am edt sat apr 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 29.1 inch low over james bay this morning continues departing 
northward, deepening to 28.9 inches. behind it, ridging builds over 
lake superior, strengthening to about 30.3 inches sunday night into 
monday morning. this ridging 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 towards northern quebec. high 
pressure ridging builds back to 30.1 inches over lake superior by 
tuesday night. the high shifts east on wednesday as a 29.2 inch low 
pressure develops over the northern plains.



lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1000 am edt sat apr 18 2026

...gale warning in effect through this evening...

.rest of today...west winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. a slight chance of snow showers. waves
6 to 9 feet occasionally to 11 feet building to 9 to 12 feet
occasionally to 15 feet. 
.tonight...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. a chance of snow showers through
midnight. waves subsiding to 5 to 8 feet occasionally to 10 feet.
.sunday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. waves subsiding to 3 to 5 feet occasionally to
7 feet. 
.sunday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...southwest winds 10 to 20 knots becoming south 15 to
25 knots by mid afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.monday night...south winds 20 to 30 knots becoming west 15 to
25 knots after midnight. 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 10 to 20 knots becoming north less than
10 knots. waves subsiding to calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 15 to
25 knots. waves building to 3 to 6 feet occasionally to 8 feet. 

$$