fzus61 kbuf 180202
glflo 
expires:202605180900;;741003

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun may 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...high pressure will weaken to 30.0 inches across the 
lake tonight. an area of low pressure will develop over the central 
plains monday. the low will weaken from 29.4 inches to 29.6 inches 
as it tracks northeast to the upper great lakes monday night into 
tuesday morning, then to central quebec wednesday while 
strengthening to 29.4 inches. a cold front attendant to this low 
will cross the lake late tuesday night into wednesday morning. a 
large 30.4 inch high will then build across the entire great lakes 
region wednesday night through thursday. high pressure will move to 
the east and weaken to 30.1 inches friday.


loz063>065-180900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun may 17 2026

.overnight...southeast winds 5 to 10 knots. patchy fog
after midnight. a chance of showers and thunderstorms.
waves 1 foot or less. 
.monday...south winds 5 to 15 knots. waves 2 feet or less. 
.monday night...south winds 5 to 10 knots. a chance of showers.
waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. a chance of showers in
the morning. waves 1 to 3 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest. a
chance of showers during the day. waves 3 to 6 feet. 
.thursday...north winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 10 knots becoming southeast. a chance
of showers friday night. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 180202
glflo 
expires:202605180900;;741002

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun may 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...high pressure will weaken to 30.0 inches across the 
lake tonight. an area of low pressure will develop over the central 
plains monday. the low will weaken from 29.4 inches to 29.6 inches 
as it tracks northeast to the upper great lakes monday night into 
tuesday morning, then to central quebec wednesday while 
strengthening to 29.4 inches. a cold front attendant to this low 
will cross the lake late tuesday night into wednesday morning. a 
large 30.4 inch high will then build across the entire great lakes 
region wednesday night through thursday. high pressure will move to 
the east and weaken to 30.1 inches friday.


loz062-180900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sun may 17 2026

.overnight...southeast winds 5 to 10 knots becoming east. a
chance of showers and thunderstorms. waves 1 foot or less. 
.monday...southeast winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots in the afternoon. waves 1 foot or
less building to 2 to 4 feet. 
.monday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. a chance of showers overnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
25 knots. a chance of showers in the morning. waves 1 to 3 feet
building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots becoming west.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming north 10 to
15 knots. a chance of showers during the day. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday...east winds 10 to 15 knots. a chance of showers friday
night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180125
glfle 
expires:202605180830;;740123

open lake forecast for lake erie
national weather service cleveland oh
925 pm edt sun may 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...
a stalled frontal boundary will waver north of lake erie tonight
before lifting northeast as a warm front on monday. low pressure 
of 29.60 inches will track from the upper midwest through the 
upper great lakes tuesday with a trailing cold front that will 
push across lake erie early wednesday morning. high pressure of 
30.20 inches will build over lake erie wednesday night and 
thursday.


lez061-167>169-180830-
ripley to buffalo ny extending from 5nm 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-
925 pm edt sun may 17 2026

.overnight...southeast winds 5 to 10 knots becoming south.
waves 2 feet or less. 
.monday...south winds 10 to 15 knots becoming southwest. waves
2 feet or less. 
.monday night...southwest winds 10 to 15 knots. waves 1 to
3 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers in the afternoon. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. showers with a chance of thunderstorms. waves
2 to 4 feet. 
.wednesday...northwest winds 10 to 15 knots becoming northeast.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.friday...east winds 5 to 15 knots becoming southeast. a chance
of showers. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180125
glfle 
expires:202605180830;;740122

open lake forecast for lake erie
national weather service cleveland oh
925 pm edt sun may 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...
a stalled frontal boundary will waver north of lake erie tonight
before lifting northeast as a warm front on monday. low pressure 
of 29.60 inches will track from the upper midwest through the 
upper great lakes tuesday with a trailing cold front that will 
push across lake erie early wednesday morning. high pressure of 
30.20 inches will build over lake erie wednesday night and 
thursday.


lez162>166-180830-
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-
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-
925 pm edt sun may 17 2026

.overnight...south winds 10 to 15 knots. waves 2 feet or
less. 
.monday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a slight chance of showers late. waves 1 to 3 feet. 
.monday night...southwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. showers likely in the afternoon.
waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. showers with a chance of thunderstorms. waves
2 to 4 feet. 
.wednesday...north winds 10 to 15 knots becoming northeast. waves
1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.friday...east winds 10 to 15 knots. a chance of showers. waves
2 to 4 feet subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 180135
glfsc 
expires:202605180945;;740306

lake st clair forecast
national weather service detroit/pontiac mi
935 pm edt sun may 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...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lcz460-180945-
lake st clair-
935 pm edt sun may 17 2026

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

.rest of tonight...south winds 10 to 15 knots. partly cloudy. waves
2 feet or less.
.monday...south winds 10 to 15 knots increasing to 20 to 25 knots.
mostly sunny. a chance of showers and thunderstorms late in the
afternoon. waves 1 to 3 feet building to 2 to 4 feet late in the
afternoon.
.monday night...southwest winds 15 to 20 knots diminishing to 10 to
15 knots after midnight. partly cloudy becoming mostly cloudy by
midnight becoming partly cloudy. a chance of showers and
thunderstorms . waves 1 to 3 feet.
.tuesday...south winds 15 to 20 knots becoming southwest 20 to 25
knots with gusts to 30 knots in the late morning and afternoon.
light showers and a chance of thunderstorms early in the afternoon.
waves 1 to 3 feet building to 2 to 4 feet in the late morning and
afternoon.
.tuesday night...west winds 15 to 20 knots veering to the northwest
after midnight. light showers in the evening. a chance of
thunderstorms. light showers likely after midnight. waves 2 to 4
feet subsiding to 1 to 3 feet in the late evening and overnight.
.wednesday...north winds 15 to 20 knots diminishing to 10 to 15
knots in the afternoon and evening. partly sunny in the morning
becoming mostly clear. waves 2 feet or less.
.thursday...northeast winds 10 to 15 knots. mostly clear. waves 2
feet or less.
.friday...east winds 10 to 15 knots. partly cloudy. waves 2 feet or
less.

$$

fzus63 kdtx 180135
glflh 
expires:202605180945;;740302

open lake forecast for lake huron
national weather service detroit/pontiac mi
935 pm edt sun may 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...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz361-180945-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
935 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 20 knots decreasing to 10 to
15 knots early in the morning. showers this evening...then
scattered showers and thunderstorms after midnight. waves 3 to
5 feet. 
.monday...southeast winds 10 to 15 knots becoming south 5 to
10 knots late in the afternoon. a chance of showers and
thunderstorms in the afternoon. waves 3 to 5 feet. 
.monday night...south winds 5 to 10 knots backing to the
southeast in the late evening and overnight. a chance of showers.
waves 2 to 4 feet subsiding to 1 to 3 feet after midnight. 
.tuesday...southeast winds 10 to 15 knots becoming south 15 to
20 knots in the late morning and early afternoon...then veering
to the southwest early in the afternoon. showers. waves 3 to
5 feet building to 5 to 7 feet early in the afternoon. waves
occasionally around 10 feet. 
.tuesday night...west winds 20 to 25 knots. gusts to 30 knots in
the late evening and overnight. waves 6 to 9 feet. waves
occasionally around 12 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots becoming north 5 to 10 knots. waves 6 to 9 feet
subsiding to 3 to 5 feet late in the afternoon. waves
occasionally around 12 feet. 
.thursday...light and variable winds becoming east 5 to 10 knots
. waves 2 feet or less. 
.friday...southeast winds 5 to 10 knots becoming east 10 to
15 knots until early evening...then decreasing to 5 to 10 knots
by midnight. waves 1 to 3 feet. 


$$

fzus63 kdtx 180135
glflh 
expires:202605180945;;740303

open lake forecast for lake huron
national weather service detroit/pontiac mi
935 pm edt sun may 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...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz362-363-180945-
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-
935 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 20 knots decreasing to 10 to
15 knots after midnight. showers and scattered thunderstorms this
evening...then scattered showers and thunderstorms after
midnight. waves 3 to 5 feet. 
.monday...south winds 15 to 20 knots. a chance of showers and
thunderstorms in the afternoon. waves 4 to 6 feet building to
5 to 7 feet late in the afternoon. waves occasionally around
10 feet. 
.monday night...south winds 15 to 20 knots decreasing to 10 to
15 knots in the late evening and overnight. a chance of showers
and thunderstorms in the evening...then a chance of showers after
midnight. waves 4 to 6 feet. waves occasionally around 8 feet. 
.tuesday...south winds 15 to 20 knots increasing to 20 to
25 knots in the late morning and afternoon. a chance of showers
in the morning...then showers likely in the afternoon. waves 4 to
6 feet building to 6 to 9 feet early in the afternoon. waves
occasionally around 12 feet. 
.tuesday night...southwest winds 20 to 25 knots becoming
northwest 15 to 20 knots with gusts to around 30 knots in the
late evening and overnight. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.wednesday...northwest winds 15 to 20 knots. waves 6 to 9 feet
subsiding to 3 to 5 feet late in the evening. waves occasionally
around 12 feet. 
.thursday...north winds 5 to 10 knots early in the morning
becoming light and variable...then becoming northeast 5 to
10 knots . waves 1 to 3 feet. 
.friday...east winds 5 to 10 knots becoming northeast 10 to
15 knots early in the evening...then decreasing to 5 to 10 knots
by midnight. waves 2 feet or less. 


$$

fzus63 kdtx 180135
glflh 
expires:202605180945;;740304

open lake forecast for lake huron
national weather service detroit/pontiac mi
935 pm edt sun may 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...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz462>464-180945-
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-
935 pm edt sun may 17 2026

.rest of tonight...east winds 10 to 15 knots veering to the
southeast after midnight. scattered showers and thunderstorms
this evening...then scattered showers after midnight. waves 1 to
3 feet building to 2 to 4 feet after midnight. 
.monday...south winds 10 to 15 knots increasing to 15 to 20 knots
in the late morning and afternoon. a chance of showers and
thunderstorms in the afternoon. waves 3 to 5 feet. 
.monday night...south winds 15 to 20 knots decreasing to 10 to
15 knots in the late evening and overnight. showers likely and a
chance of thunderstorms in the evening...then a chance of showers
and thunderstorms after midnight. waves 3 to 5 feet. 
.tuesday...south winds 15 to 20 knots. a chance of showers in the
morning...then showers and a chance of thunderstorms in the
afternoon. waves 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots veering to the
west by midnight...then becoming northwest 10 to 15 knots after
midnight. a chance of showers and thunderstorms in the evening.
waves 4 to 6 feet. waves occasionally around 8 feet. 
.wednesday...northwest winds 10 to 15 knots. waves 3 to 5 feet. 
.thursday...northeast winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.friday...east winds 5 to 10 knots backing to the northeast by
midnight. waves 2 feet or less. 


$$

fzus63 kmkx 180144
glflm 
expires:202605180915;;740580

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
844 pm cdt sun may 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...

a warm front will move from southern lake michigan to northern
lake michigan throughout the night. east to northeast winds will 
become breezy out of the south. areas of dense fog may occur at 
times until the front passes. breezy south winds will then 
continue through monday and into tuesday followed by a wind shift 
to the northwest late tuesday afternoon and evening with the 
passage of a cold front. high pressure and light and variable 
winds will then take hold from late wednesday into thursday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-180915-
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-
844 pm cdt sun may 17 2026

sheboygan wi to pentwater mi south...

.rest of tonight...variable winds 10 to 20 knots becoming southeast
winds to 30 kt becoming south. areas of fog through early 
evening, then patchy dense fog overnight. chance of rain showers 
and thunderstorms overnight. waves 3 to 5 ft building to 5 to 8 ft
occasionally to 10 ft. 
.monday...south winds to 30 kt diminishing to 15 to 25 kt. chance
of showers and thunderstorms. waves 5 to 8 ft occasionally to
10 ft. 
.monday night...south winds 15 to 25 kt increasing to 30 kt.
chance of showers and thunderstorms. waves 4 to 7 ft occasionally
to 9 ft. 
.tuesday...south winds to 30 kt becoming southwest. chance of
showers and thunderstorms in the morning, then chance of showers
in the afternoon. waves 5 to 8 ft occasionally to 10 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north.
waves 4 to 6 ft occasionally to 8 ft. 
.wednesday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
10 to 15 kt. waves 3 to 5 ft subsiding to 2 to 4 ft. 
.thursday...east winds 10 to 15 kt becoming northeast 10 to
20 kt. waves 1 to 3 ft. 
.friday...east winds 10 to 15 kt becoming northeast. waves 1 to
3 ft.  

$$

fzus63 kmkx 180144
glflm 
expires:202605180915;;740579

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
844 pm cdt sun may 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...

a warm front will move from southern lake michigan to northern
lake michigan throughout the night. east to northeast winds will 
become breezy out of the south. areas of dense fog may occur at 
times until the front passes. breezy south winds will then 
continue through monday and into tuesday followed by a wind shift 
to the northwest late tuesday afternoon and evening with the 
passage of a cold front. high pressure and light and variable 
winds will then take hold from late wednesday into thursday.


lmz261-362-364-366-563-565-567-868-180915-
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-
844 pm cdt sun may 17 2026

sheboygan wi to pentwater mi north...

.rest of tonight...east winds to 30 kt becoming south. patchy
fog. rain showers likely with a chance of thunderstorms through
early evening, then chance of rain showers and thunderstorms
overnight. waves 3 to 5 ft building to 5 to 8 ft occasionally to
10 ft. 
.monday...south winds to 30 kt. patchy fog. chance of showers and
thunderstorms. waves 6 to 9 ft occasionally to 12 ft. 
.monday night...south winds 15 to 25 kt. patchy fog in the
evening, then areas of fog overnight. chance of showers and
thunderstorms in the evening, then showers with a chance of
thunderstorms overnight. waves 5 to 8 ft occasionally to 10 ft. 
.tuesday...south winds to 30 kt becoming west. showers with a
chance of thunderstorms in the morning. waves 5 to 8 ft
occasionally to 10 ft. 
.tuesday night...northwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft. 
.wednesday...north winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 3 to 5 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
5 to 10 kt. waves 1 to 3 ft subsiding to 1 to 2 ft. 
.thursday...east winds 5 to 10 kt becoming northeast 10 to 20 kt.
waves 1 ft or less. 
.friday...southeast winds 10 to 15 kt becoming northeast 10 to
20 kt. waves 1 to 3 ft.  

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741163

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz162-180800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1005 pm edt sun may 17 2026 /905 pm cdt sun may 17 2026/

...gale warning in effect until 11 pm edt /10 pm cdt/ this
evening...

.rest of tonight...east winds 20 to 30 knots with a few gale force
gusts up to 35 knots early backing northeast after midnight, then 
diminishing to 15 to 25 knots late. a chance of rain showers by 
midnight, then rain showers likely and a slight chance of 
thunderstorms after midnight. waves 7 to 10 feet occasionally to 13 
feet subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...north winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. a slight chance of rain showers. waves subsiding to 2 to
4 feet. 
.monday night...northeast 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, then rain
showers after midnight. waves building to 6 to 9 feet
occasionally to 11 feet. 
.tuesday...north winds 20 to 30 knots becoming west 10 to
20 knots by mid afternoon. rain showers likely through early
afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots veering south. waves
building to 1 to 3 feet. 
.friday...south winds 5 to 15 knots backing east. waves subsiding
to calm to 2 feet. 

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741164

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz263-180800-
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-
1005 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 25 knots. a chance of rain
showers by midnight, then rain showers and a chance of
thunderstorms after midnight. waves 4 to 7 feet occasionally to
9 feet subsiding to 3 to 6 feet occasionally to 8 feet. 
.monday...north winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then becoming northeast 10 to 20 knots late. a
slight chance of rain showers. waves subsiding to 2 to 4 feet. 
.monday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of rain showers through
midnight. a slight chance of thunderstorms. rain showers after
midnight. waves building to 6 to 9 feet occasionally to 11 feet. 
.tuesday...north winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. rain showers likely through early
afternoon. waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots becoming southwest
10 to 20 knots by mid afternoon. waves building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...south winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.friday...south winds 5 to 15 knots backing southeast. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741165

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz264-180800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1005 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 25 knots. a slight chance of
rain showers by midnight, then rain showers and a chance of
thunderstorms after midnight. waves 2 to 4 feet building to 3 to
6 feet occasionally to 8 feet. 
.monday...east winds 10 to 20 knots becoming north 5 to 15 knots
in the afternoon, then increasing to 10 to 20 knots late. a
chance of rain showers through early afternoon. waves subsiding
to 2 to 4 feet. 
.monday night...northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. a chance of rain showers through
midnight. a slight chance of thunderstorms. rain showers after
midnight. waves building to 6 to 9 feet occasionally to 11 feet. 
.tuesday...north winds 20 to 30 knots backing northwest by mid
afternoon. rain showers through early afternoon. waves building
to 7 to 10 feet occasionally to 13 feet, then subsiding to 4 to
7 feet occasionally to 9 feet. 
.tuesday night...north winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. waves subsiding to calm to
2 feet. 
.wednesday night...southwest winds 5 to 15 knots backing south
after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 2 to 4 feet. 
.friday...southeast winds 5 to 15 knots. waves subsiding to 1 to
3 feet. 

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741166

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz265-180800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1005 pm edt sun may 17 2026

.rest of tonight...east winds 15 to 25 knots veering southeast
late. a chance of rain showers by midnight, then rain showers and
a chance of thunderstorms after midnight. waves 2 to 4 feet
building to 3 to 6 feet occasionally to 8 feet. 
.monday...southeast winds 10 to 20 knots veering northwest in the
afternoon, then becoming north 15 to 25 knots late. a slight
chance of showers. waves subsiding to 1 to 3 feet. 
.monday night...north winds 10 to 20 knots veering northeast
after midnight. a chance of rain showers through midnight. a
slight chance of thunderstorms. rain showers after midnight.
waves building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. rain showers and a slight chance of
thunderstorms through early afternoon. waves building to 6 to
9 feet occasionally to 11 feet. 
.tuesday 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. 
.wednesday...northwest winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds 10 to 20 knots becoming south 15 to
25 knots. waves building to 2 to 4 feet, then subsiding to 1 to
3 feet. 
.friday...southeast winds 10 to 20 knots veering south. waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741167

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz266-180800-
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-
1005 pm edt sun may 17 2026

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

$$

fzus63 kmqt 180205 cca
glfls 
expires:202605180800;;741168

open lake forecast for lake superior...corrected
national weather service marquette mi
1005 pm edt sun may 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 29.5 inch low over the plains this evening weakens to 29.6 inches 
as it pushes into lake superior monday morning. another low pressure 
follows it, reaching lake superior by tuesday morning at 29.6 
inches. afterwards, a 30.2 inch high over the northern plains builds 
to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz267-180800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1005 pm edt sun may 17 2026

.rest of tonight...southeast winds 20 to 30 knots backing east
after midnight, then veering southeast late. rain showers. a
chance of thunderstorms after midnight. waves 2 to 4 feet
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet. 
.monday...southeast winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon, then veering northwest late. showers
likely and a slight chance of thunderstorms through early
afternoon, then a slight chance of showers by mid afternoon.
waves subsiding to calm to 2 feet. 
.monday night...west winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight, then becoming southeast 15 to 25 knots
late. a chance of rain showers through midnight. a slight chance
of thunderstorms. rain showers likely after midnight. waves
building to 3 to 5 feet occasionally to 7 feet. 
.tuesday...south winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. rain showers through early afternoon.
a slight chance of thunderstorms. a slight chance of rain showers
by mid afternoon. waves building to 8 to 11 feet occasionally to
14 feet. 
.tuesday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.wednesday night...west winds 5 to 15 knots backing south after
midnight. waves subsiding to calm to 2 feet. 
.thursday...southeast winds 5 to 15 knots. waves building to 1 to
3 feet. 
.friday...southeast winds 10 to 20 knots. waves subsiding to calm
to 2 feet. 

$$