fzus61 kbuf 182009
glflo 
expires:202604190300;;598719

open lake forecast for lake ontario
national weather service buffalo ny
409 pm 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 29.5 inch low east of lake superior this afternoon 
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. a warm front will then approach the lake by friday.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 pm edt sat apr 18 2026

.tonight...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. rain showers this evening, then rain showers
likely after midnight. rain showers late. 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 early. waves 2 to 4 feet building to
3 to 5 feet. 
.sunday night...west winds 15 to 20 knots. waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.monday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots. waves 1 to 2 feet. 
.wednesday...north winds 5 to 15 knots becoming northwest. waves
2 feet or less. 
.thursday...north winds 10 knots or less becoming east. waves
1 foot or less. 

$$

fzus61 kbuf 182009
glflo 
expires:202604190300;;598718

open lake forecast for lake ontario
national weather service buffalo ny
409 pm 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 29.5 inch low east of lake superior this afternoon 
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. a warm front will then approach the lake by friday.


loz062-190300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt sat apr 18 2026

.tonight...west winds 15 to 20 knots becoming northwest 10 to
15 knots. rain showers early, then a chance of rain showers. a
chance of rain and snow showers late. waves 2 to 3 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of rain showers late. waves 2 to 4 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest. a
chance of rain showers in the evening. waves 2 to 4 feet. 
.monday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming southwest.
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 knots or less. waves 1 foot or less. 
.thursday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 

$$

fzus61 kcle 181950
glfle 
expires:202604190230;;597631

open lake forecast for lake erie
national weather service cleveland oh
350 pm 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 lifts into quebec tonight, dragging a
cold front east of the region. a trough averaging 29.90 inches 
moves across the lake sunday afternoon before high pressure 30.40
inches moves overhead sunday night into monday. another cold front
will cross the lake tuesday night or early wednesday before high 
pressure returns wednesday and thursday. 


lez162>164-190230-
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-
350 pm edt sat apr 18 2026

.tonight...west winds 15 to 20 knots. a slight chance of showers
this evening. waves 2 to 4 feet. 
.sunday...west winds 15 to 25 knots. a chance of showers in the
afternoon. waves 2 to 4 feet. 
.sunday night...northwest winds 15 to 25 knots becoming north and
diminishing to 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 northwest less than
10 knots. waves 2 feet or less. 
.monday night...southeast winds 10 knots or less becoming south
and increasing to 15 to 20 knots overnight. waves 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. a chance of rain showers tuesday night. waves 1 to
3 feet. 
.wednesday...north winds 10 to 15 knots becoming southeast
10 knots or less. waves 2 feet or less. 
.thursday...southeast winds 5 to 15 knots becoming south 15 to
20 knots. waves 2 feet or less. 

$$

fzus61 kcle 181950
glfle 
expires:202604190230;;597632

open lake forecast for lake erie
national weather service cleveland oh
350 pm 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 lifts into quebec tonight, dragging a
cold front east of the region. a trough averaging 29.90 inches 
moves across the lake sunday afternoon before high pressure 30.40
inches moves overhead sunday night into monday. another cold front
will cross the lake tuesday night or early wednesday before high 
pressure returns wednesday and thursday. 


lez165>168-190230-
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-
350 pm edt sat apr 18 2026

.tonight...west winds 15 to 20 knots. a slight chance of showers
early, then a chance of showers late this evening. waves 2 to
4 feet. 
.sunday...west winds 15 to 20 knots. a slight chance of rain
showers late. 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. waves 1 to 3 feet. 
.monday night...southwest 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. a chance of rain showers tuesday night. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming east 10 knots
or less. waves 1 to 3 feet subsiding to 1 foot or less. 
.thursday...southeast winds 5 to 15 knots becoming south. waves
2 feet or less. 

$$

fzus61 kcle 181950
glfle 
expires:202604190230;;597633

open lake forecast for lake erie
national weather service cleveland oh
350 pm 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 lifts into quebec tonight, dragging a
cold front east of the region. a trough averaging 29.90 inches 
moves across the lake sunday afternoon before high pressure 30.40
inches moves overhead sunday night into monday. another cold front
will cross the lake tuesday night or early wednesday before high 
pressure returns wednesday and thursday. 


lez061-169-190230-
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-
350 pm edt sat apr 18 2026

.tonight...west winds 10 to 15 knots. a chance of rain showers
with a slight chance of thunderstorms early, then a chance of
rain showers from late evening on. waves 2 to 4 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
a slight chance of rain and snow showers late. waves 2 to 4 feet.
.sunday night...west winds 15 to 20 knots becoming northwest
10 to 15 knots. a chance of rain and snow showers in the evening.
waves 2 to 4 feet subsiding to 1 to 2 feet. 
.monday...northwest winds around 10 knots becoming west. waves
1 to 2 feet. 
.monday night...west winds 10 knots or less becoming south. waves
around 1 foot. 
.tuesday...south winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.wednesday...north winds 5 to 10 knots becoming light and
variable. waves 2 feet or less. 
.thursday...east winds 10 knots or less becoming southeast. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 181933
glfsc 
expires:202604190400;;597257

lake st clair forecast
national weather service detroit/pontiac mi
333 pm 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...colder air filters into the region this weekend,
maintaining gusty northwesterly winds. a secondary cold front
passes across the region on sunday, then high pressure settles in
on monday. milder southerly flow early tuesday precedes the next
cold front set to pass through late tuesday.


lcz460-190400-
lake st clair-
333 pm edt sat apr 18 2026

...small craft advisory in effect from sunday morning through
sunday evening...

.tonight...west winds 15 to 20 knots diminishing to 10 to 15 knots
after midnight. mostly cloudy this evening becoming partly cloudy.
waves 2 feet or less.
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots in
the afternoon. gusts to 25 knots. sunny in the morning...then 
partly sunny with a chance of light showers 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 late morning and afternoon. mostly sunny. waves 2 feet
or less.
.monday night...south winds 5 to 10 knots increasing to 10 to 15
knots in the late evening and overnight. mostly clear. waves 2 feet
or less.
.tuesday...south winds 15 to 20 knots becoming southwest 10 to 15
knots in the evening. partly sunny becoming mostly sunny in the
afternoon becoming partly cloudy. waves 1 to 3 feet.
.wednesday...northeast winds 10 to 15 knots. partly cloudy. waves 2
feet or less.
.thursday...southeast winds 10 to 15 knots. mostly clear. waves 2
feet or less.

$$

fzus63 kdtx 181933
glflh 
expires:202604190400;;597253

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 pm 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...colder air filters into the region this weekend,
maintaining gusty northwesterly winds. a secondary cold front
passes across the region on sunday, then high pressure settles in
on monday. milder southerly flow early tuesday precedes the next
cold front set to pass through late tuesday.


lhz361>363-190400-
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-
333 pm edt sat apr 18 2026

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


$$

fzus63 kdtx 181933
glflh 
expires:202604190400;;597254

open lake forecast for lake huron
national weather service detroit/pontiac mi
333 pm 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...colder air filters into the region this weekend,
maintaining gusty northwesterly winds. a secondary cold front
passes across the region on sunday, then high pressure settles in
on monday. milder southerly flow early tuesday precedes the next
cold front set to pass through late tuesday.


lhz462>464-190400-
lake huron from port austin to harbor beach beyond 5nm off shore-
lake huron from harbor beach to port sanilac beyond 5nm off shore-
lake huron from port sanilac to port huron beyond 5nm off shore-
333 pm edt sat apr 18 2026

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


$$

fzus63 kmkx 181943
glflm 
expires:202604190315;;597492

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
243 pm 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 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.

high pressure around 30.2 inches will pass by to the northeast of
the region wednesday, with winds weakening. winds should become 
southeast to south and increase later in the week, as strong low 
pressure around 29.2 inches develops in the northern plains.


lmz080-669-671-673-675-777-779-870-872-874-876-878-190315-
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-
243 pm cdt sat apr 18 2026

sheboygan wi to pentwater mi south...

.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. chance of
rain showers and slight chance of snow showers in the morning,
then chance of rain showers in the afternoon. waves 3 to 5 ft. 
.sunday night...north winds 10 to 20 kt diminishing to 10 to
15 kt late in the evening, then becoming northeast after midnight
diminishing to 5 to 10 kt late. waves 2 to 4 ft. 
.monday...east winds 5 to 10 kt becoming southeast 10 to 20 kt in
the afternoon. waves 1 to 3 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 15 to 25 kt diminishing to 10 to 20 kt.
waves 4 to 7 ft occasionally to 9 ft. 
.tuesday night...west winds 10 to 15 kt veering to north. waves
2 to 4 ft. 
.wednesday...northeast winds 10 to 15 kt becoming north 5 to
10 kt. waves 1 to 3 ft. 
.thursday...south winds 15 to 25 kt. waves 4 to 6 ft occasionally
to 8 ft building to 4 to 7 ft occasionally to 9 ft.  

$$

fzus63 kmkx 181943
glflm 
expires:202604190315;;597491

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
243 pm 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 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.

high pressure around 30.2 inches will pass by to the northeast of
the region wednesday, with winds weakening. winds should become 
southeast to south and increase later in the week, as strong low 
pressure around 29.2 inches develops in the northern plains.


lmz261-362-364-366-563-565-567-868-190315-
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-
243 pm cdt sat apr 18 2026

sheboygan wi to pentwater mi north...

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

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597861

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sat apr 18 2026 /300 pm cdt sat apr 18 2026/

.late this afternoon...west winds to 30 knots with a few gale
force gusts to 35 knots possible. waves 4 to 7 feet occasionally
to 9 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 10 to 20 knots becoming north
5 to 15 knots after midnight. waves calm to 2 feet. 
.monday...south winds 10 to 20 knots. waves building to 2 to
4 feet. 
.monday night...southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. waves subsiding to calm to 2 feet.
.tuesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.tuesday night...northeast winds 5 to 15 knots. waves 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 6 feet
occasionally to 8 feet. 
.thursday...east winds 15 to 25 knots. a chance of rain showers,
then rain showers likely. waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 6 to 9 feet occasionally
to 11 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597862

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz263-190800-
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 pm edt sat apr 18 2026

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

.late this afternoon...west gales to 35 knots. flurries. waves
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 3 to 6 feet occasionally to
8 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 5 to 15 knots veering north after
midnight, then backing northwest late. 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 15 to 25 knots veering west after
midnight. waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet. 
.tuesday...west winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.tuesday night...east winds less than 10 knots. waves 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. 
.thursday...east winds 15 to 25 knots becoming southeast 20 to
30 knots. a chance of rain showers, then rain showers likely.
waves building to 7 to 10 feet occasionally to 13 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597863

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz264-190800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt sat apr 18 2026

...gale warning in effect until midnight edt tonight...

.late this afternoon...west gales to 35 knots. flurries. waves
9 to 12 feet occasionally to 15 feet subsiding to 8 to 11 feet
occasionally to 14 feet. 
.tonight...northwest winds 20 to 30 knots. flurries 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 5 to 15 knots veering north after
midnight, then backing northwest late. 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 15 to 25 knots veering west after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...west winds less than 10 knots backing east after
midnight. waves calm to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots. a chance of rain showers, then rain showers likely.
waves building to 8 to 11 feet occasionally to 14 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597864

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz265-190800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt sat apr 18 2026

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

.late this afternoon...west gales to 40 knots. flurries. waves
6 to 9 feet occasionally to 11 feet. 
.tonight...west gales to 35 knots veering northwest after
midnight. flurries through midnight. waves subsiding to 4 to
7 feet occasionally to 9 feet. 
.sunday...northwest winds 20 to 30 knots. flurries through early
afternoon. waves subsiding to 3 to 6 feet occasionally to 8 feet.
.sunday night...northwest winds 15 to 25 knots diminishing to
5 to 15 knots. waves subsiding to calm to 2 feet. 
.monday...southwest winds 10 to 20 knots backing southeast by mid
afternoon. waves building to 1 to 3 feet. 
.monday night...south winds 20 to 30 knots veering southwest
after midnight. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.tuesday...northwest winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.tuesday night...northwest winds 5 to 15 knots veering east after
midnight. waves 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. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots. a chance of rain showers, then rain showers likely.
waves building to 6 to 9 feet occasionally to 11 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597865

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz266-190800-
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 pm edt sat apr 18 2026

...gale warning in effect until midnight edt tonight...

.late this afternoon...west gales to 35 knots. flurries. waves
10 to 14 feet occasionally to 18 feet. 
.tonight...west gales to 35 knots becoming northwest 20 to
30 knots after midnight, then increasing to gales to 35 knots
late. flurries. waves subsiding to 7 to 10 feet occasionally to
13 feet. 
.sunday...northwest gales to 35 knots diminishing to 20 to
30 knots late. a chance of snow showers. waves subsiding to 6 to
9 feet occasionally to 11 feet. 
.sunday night...northwest winds 15 to 25 knots veering north
after midnight, then diminishing to 5 to 15 knots late. waves
subsiding to 2 to 4 feet. 
.monday...southwest winds 5 to 15 knots becoming south 15 to
25 knots by mid afternoon. waves subsiding to calm to 2 feet,
then building to 2 to 4 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 10 to
20 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 10 to 20 knots becoming
northeast 5 to 15 knots after midnight. waves subsiding to calm
to 2 feet. 
.wednesday...southeast winds 5 to 15 knots increasing to 20 to
30 knots. waves building to 3 to 6 feet occasionally to 8 feet. 
.thursday...southeast winds 20 to 30 knots increasing to gales to
35 knots. a chance of rain showers. waves building to 8 to
11 feet occasionally to 14 feet. 

$$

fzus63 kmqt 182001
glfls 
expires:202604190800;;597866

open lake forecast for lake superior
national weather service marquette mi
400 pm 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...

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 30.0 
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. the low deepens to 29.1 inches on thursday over north 
dakota, then likely moves northeast to northern ontario through 
friday. this sends a 29.5 inch trough across the lake.



lsz267-190800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt sat apr 18 2026

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

.late this afternoon...west gales to 40 knots. flurries. waves
10 to 14 feet occasionally to 18 feet. 
.tonight...west gales to 35 knots becoming northwest 20 to
30 knots after midnight. a chance of snow showers. waves
subsiding to 7 to 10 feet occasionally to 13 feet, then building
to 8 to 11 feet occasionally to 14 feet. 
.sunday...northwest gales to 35 knots. a chance of snow showers.
waves subsiding to 6 to 9 feet occasionally to 11 feet. 
.sunday night...northwest winds 20 to 30 knots becoming north
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. waves subsiding to 2 to 4 feet. 
.monday...west winds 5 to 15 knots becoming south 10 to 20 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. waves building to 4 to
8 feet occasionally to 10 feet. 
.tuesday...west winds 15 to 25 knots veering northwest by mid
afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 5 to 15 knots veering northeast
after midnight. 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. 
.thursday...southeast winds 15 to 25 knots increasing to gales to
35 knots. a chance of rain showers. waves building to 6 to 9 feet
occasionally to 11 feet. 

$$