fzus61 kbuf 200202
glflo 
expires:202605200900;;322315

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 19 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...an 29.6 inch area of low pressure over western quebec 
this evening will swing a cold front across the lake late tonight. a 
large 30.4 inch area of surface high pressure will then build across 
the entire great lakes region wednesday afternoon through thursday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday.  a 29.9 inch low and attendant warm 
front will then slowly approach the lake later friday night and 
saturday, before weakening and sliding eastward sunday with the 
large area of high pressure over atlantic canada.


loz063>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue may 19 2026

.rest of tonight...southwest winds 15 to 20 knots becoming west.
showers likely with a chance of thunderstorms late this evening,
then showers likely after midnight. waves 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers
early. waves 2 to 4 feet building to 3 to 6 feet. 
.wednesday night...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming west. waves
1 to 3 feet subsiding to 1 foot or less. 
.thursday night...west winds less than 10 knots. waves 1 foot or
less. 
.friday...east winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast. showers
likely. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.sunday...southeast winds 15 to 20 knots becoming south 10 to
15 knots. showers likely during the day, then a chance of showers
sunday night. waves 2 to 4 feet subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 200202
glflo 
expires:202605200900;;322314

open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 19 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...an 29.6 inch area of low pressure over western quebec 
this evening will swing a cold front across the lake late tonight. a 
large 30.4 inch area of surface high pressure will then build across 
the entire great lakes region wednesday afternoon through thursday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday.  a 29.9 inch low and attendant warm 
front will then slowly approach the lake later friday night and 
saturday, before weakening and sliding eastward sunday with the 
large area of high pressure over atlantic canada.


loz062-200900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue may 19 2026

.rest of tonight...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms late this evening, then a
chance of showers after midnight. showers likely late. waves 3 to
5 feet. 
.wednesday...northwest winds 10 to 15 knots becoming west. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots becoming north.
waves 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
waves 2 feet or less. 
.thursday night...east winds 10 knots or less. waves 1 foot or
less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
showers likely friday night. waves 2 feet or less building to
2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers likely. waves 3 to
6 feet. 
.sunday...east winds 5 to 15 knots becoming southwest less than
10 knots. showers likely during the day, then a chance of showers
sunday night. waves 1 to 3 feet subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200738
glfle 
expires:202605201415;;335877

open lake forecast for lake erie
national weather service cleveland oh
338 am edt wed may 20 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 cold front exits to the southeast this morning. high pressure
30.40 inches slides across the northern great lakes tonight and
thursday before shifting into new england on friday. low pressure
30.00 inches approaches from the southwest friday night into
saturday, lifting a warm front across the lake early saturday. a
weak cold front is expected to cross the lake on sunday. 


lez061-169-201415-
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-
338 am edt wed may 20 2026

.today...northwest winds 5 to 15 knots becoming west. a slight
chance of showers this morning. waves 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots becoming northeast.
waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.thursday night...northeast winds 15 to 20 knots becoming east.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.friday...northeast winds 10 to 15 knots becoming east 15 to
20 knots. a chance of rain during the day, then rain friday
night. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. rain with a chance of thunderstorms during the day,
then showers likely saturday night. waves 1 to 3 feet. 
.sunday...south winds 10 knots or less. a chance of showers
during the day, then showers likely sunday night. waves 2 feet or
less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200738
glfle 
expires:202605201415;;335875

open lake forecast for lake erie
national weather service cleveland oh
338 am edt wed may 20 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 cold front exits to the southeast this morning. high pressure
30.40 inches slides across the northern great lakes tonight and
thursday before shifting into new england on friday. low pressure
30.00 inches approaches from the southwest friday night into
saturday, lifting a warm front across the lake early saturday. a
weak cold front is expected to cross the lake on sunday. 


lez162-163-201415-
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-
338 am edt wed may 20 2026

.today...north winds 5 to 15 knots becoming northeast. a chance
of showers early, then a slight chance of showers late this
morning. waves 1 to 3 feet. 
.tonight...northeast winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 5 feet. 
.thursday night...east winds 15 to 20 knots. waves 3 to 5 feet. 
.friday...east winds 15 to 25 knots. rain likely during the day,
then rain with a chance of thunderstorms friday night. waves 3 to
5 feet. 
.saturday...southeast winds 15 to 20 knots becoming south 5 to
15 knots. rain likely with a chance of thunderstorms during the
day. waves 2 to 4 feet subsiding to 1 foot or less. 
.sunday...southwest winds 10 knots or less becoming north. a
chance of showers. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 200738
glfle 
expires:202605201415;;335876

open lake forecast for lake erie
national weather service cleveland oh
338 am edt wed may 20 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 cold front exits to the southeast this morning. high pressure
30.40 inches slides across the northern great lakes tonight and
thursday before shifting into new england on friday. low pressure
30.00 inches approaches from the southwest friday night into
saturday, lifting a warm front across the lake early saturday. a
weak cold front is expected to cross the lake on sunday. 


lez164>168-201415-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
vermilion to avon point oh beyond 5 nm off shoreline to us-
canadian border-
avon point to willowick oh beyond 5 nm off shoreline to us-
canadian border-willowick to geneva-on-the-
lake oh beyond 5nm off shoreline to us-canadian border-geneva-on-
the-lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
338 am edt wed may 20 2026

.today...north winds 15 to 20 knots diminishing to 10 to
15 knots. a slight chance of showers through early afternoon.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tonight...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 2 to 4 feet. 
.thursday...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.thursday night...northeast winds 15 to 20 knots becoming east.
waves 3 to 6 feet. 
.friday...east winds 15 to 20 knots. a chance of rain during the
day, then rain with a chance of thunderstorms friday night. waves
3 to 6 feet. 
.saturday...southeast winds 15 to 20 knots becoming south 10 to
15 knots. rain with a chance of thunderstorms during the day,
then a chance of showers saturday night. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.sunday...south winds 10 knots or less becoming southwest. a
chance of showers. waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 200743
glflh 
expires:202605201600;;336078

open lake forecast for lake huron
national weather service detroit/pontiac mi
343 am edt wed may 20 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...high pressure, 30.40 inches, will start to build in
over the great lakes this morning then slowly move east across
the region through friday morning. as this occurs, northwest flow
will veer to the northeast and persist into friday.


lhz462>464-201600-
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-
343 am edt wed may 20 2026

.today...north winds 10 to 15 knots. waves 3 to 5 feet. 
.tonight...north winds 10 to 15 knots. waves 3 to 5 feet. 
.thursday...northeast winds 10 to 15 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet in the late morning and early
afternoon...then building to 2 to 4 feet early in the afternoon. 
.thursday night...north winds 10 to 15 knots veering to the east
after midnight. waves 2 to 4 feet subsiding to 1 to 3 feet after
midnight. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots
with gusts to around 30 knots late in the afternoon. a chance of
showers late in the afternoon. rain showers likely late in the
evening. waves 3 to 5 feet building to 5 to 7 feet late in the
evening. waves occasionally around 10 feet. 
.saturday...east winds 20 to 25 knots with gusts to around
30 knots becoming southeast 10 to 15 knots. showers likely early
in the morning. rain showers in the late morning and early
afternoon...then a chance of showers early in the evening. waves
5 to 7 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 5 to 10 knots backing to the east by
midnight. waves 1 to 3 feet. 


$$

fzus63 kdtx 200743
glfsc 
expires:202605201600;;336093

lake st clair forecast
national weather service detroit/pontiac mi
343 am edt wed may 20 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...high pressure, 30.40 inches, will start to build in
over the great lakes this morning then slowly move east across
the region through friday morning. as this occurs, northwest flow
will veer to the northeast and persist into friday.


lcz460-201600-
lake st clair-
343 am edt wed may 20 2026

.today...north winds 15 to 20 knots diminishing to 10 to 15 knots
late in the morning...then diminishing to 5 to 10 knots early in the
afternoon becoming northeast 10 to 15 knots late in the afternoon.
mostly cloudy. waves 2 feet or less.
.tonight...northeast winds 15 to 20 knots. mostly cloudy this
evening becoming partly cloudy. waves 1 to 3 feet.
.thursday...northeast winds 10 to 15 knots. mostly sunny. waves 2
feet or less.
.thursday night...northeast winds 10 to 15 knots increasing to 15 to
20 knots after midnight. partly cloudy becoming mostly cloudy. waves
1 to 3 feet.
.friday...east winds 20 to 25 knots increasing to 30 knots in the
evening. mostly cloudy. a chance of light showers in the afternoon.
rain showers likely in the evening. waves 2 to 4 feet. a small craft
advisory may be needed.
.saturday...southeast winds to 30 knots. showers and a chance of
thunderstorms. waves 2 to 4 feet.
.sunday...northeast winds 10 to 15 knots. mostly cloudy. waves 2
feet or less.

$$

fzus63 kdtx 200743
glflh 
expires:202605201600;;336076

open lake forecast for lake huron
national weather service detroit/pontiac mi
343 am edt wed may 20 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...high pressure, 30.40 inches, will start to build in
over the great lakes this morning then slowly move east across
the region through friday morning. as this occurs, northwest flow
will veer to the northeast and persist into friday.


lhz361-201600-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
343 am edt wed may 20 2026

.today...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots in the late morning and
afternoon. waves 4 to 6 feet. 
.tonight...northwest winds 15 to 20 knots becoming north 10 to
15 knots by midnight...then decreasing to 5 to 10 knots early in
the morning. waves 2 to 4 feet subsiding to 1 to 3 feet early in
the morning. waves occasionally around 8 feet. 
.thursday...east winds 5 to 10 knots veering to the southeast
early in the afternoon. waves 2 feet or less. 
.thursday night...east winds 5 to 10 knots early in the evening
becoming light and variable...then becoming east 5 to 10 knots
after midnight. waves 2 feet or less. 
.friday...east winds 5 to 10 knots increasing to 20 to 25 knots
with gusts to around 30 knots. a chance of showers late in the
evening. waves 1 to 3 feet building to 6 to 9 feet. waves
occasionally around 12 feet. 
.saturday...east winds to 30 knots with gusts to 35 knot gales
decreasing to 15 to 20 knots by midnight. showers likely early in
the morning...then a chance of showers. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.sunday...east winds 10 to 15 knots becoming southeast 5 to
10 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 


$$

fzus63 kdtx 200743
glflh 
expires:202605201600;;336077

open lake forecast for lake huron
national weather service detroit/pontiac mi
343 am edt wed may 20 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...high pressure, 30.40 inches, will start to build in
over the great lakes this morning then slowly move east across
the region through friday morning. as this occurs, northwest flow
will veer to the northeast and persist into friday.


lhz362-363-201600-
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-
343 am edt wed may 20 2026

.today...northwest winds 15 to 20 knots veering to the north late
in the afternoon. waves 5 to 7 feet. waves occasionally around
10 feet. 
.tonight...north winds 15 to 20 knots decreasing to 10 to
15 knots after midnight. waves 3 to 5 feet. 
.thursday...northeast winds 10 to 15 knots decreasing to 5 to
10 knots in the late morning and afternoon. waves 2 to 4 feet
subsiding to 1 to 3 feet in the late morning and afternoon. 
.thursday night...northeast winds 5 to 10 knots. waves 1 to
3 feet. 
.friday...east winds 10 to 15 knots becoming northeast 15 to
20 knots late in the afternoon. a chance of showers late in the
evening. waves 1 to 3 feet building to 5 to 7 feet. waves
occasionally around 10 feet. 
.saturday...east winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots. showers likely early in
the morning...then a chance of showers. waves 8 to 12 feet. waves
occasionally around 15 feet. 
.sunday...southeast winds 10 to 15 knots becoming light and
variable. waves 3 to 5 feet subsiding to 1 to 3 feet. 


$$

fzus63 kmkx 200759
glflm 
expires:202605201515;;336496

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
259 am cdt wed may 20 2026

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

winds will come around from northwesterly to northeasterly through
the first half of the day as high pressure around 30.4 inches 
builds into the upper great lakes region today and then lingers 
into thursday. 

still looking at gusty northeast winds through midweek, especially
over the southern half of the lake and building waves along the 
western lakeshore. high pressure continues to build to around 30.5
inches as it lifts northeastward across ontario and quebec friday
through the weekend with easterly winds persisting across lake 
michigan. expecting winds to increase during this timeframe as 
well with a broad low pressure trough around 29.8 inches setting 
up over the plains.


lmz261-362-364-366-563-565-567-868-201515-
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-
259 am cdt wed may 20 2026

sheboygan wi to pentwater mi north...

.today...north winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 2 to 4 ft. 
.tonight...northeast winds 10 to 20 kt diminishing to 10 to
15 kt. waves 2 to 4 ft. 
.thursday...northeast winds 10 to 15 kt increasing to 10 to
20 kt. waves 1 to 3 ft. 
.thursday night...northeast winds 10 to 20 kt becoming east 10 to
15 kt. waves 1 to 3 ft. 
.friday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 1 to 3 ft building to 3 to 5 ft. 
.friday night...east winds 15 to 25 kt increasing to 30 kt.
chance of showers. waves 4 to 6 ft occasionally to 8 ft. 
.saturday...east winds to 30 kt becoming northeast. chance of
showers. waves 4 to 7 ft occasionally to 9 ft. 
.sunday...southwest winds 10 to 15 kt. waves 1 to 2 ft.  

$$

fzus63 kmkx 200759
glflm 
expires:202605201515;;336497

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
259 am cdt wed may 20 2026

for waters beyond five nautical miles of shore on lake michigan.

waves are provided as a range of significant wave heights, which
is the average of the highest 1/3 of the wave, along with the
average height of the highest 10% of the waves which will
occasionally be encountered.

.synopsis...

winds will come around from northwesterly to northeasterly through
the first half of the day as high pressure around 30.4 inches 
builds into the upper great lakes region today and then lingers 
into thursday. 

still looking at gusty northeast winds through midweek, especially
over the southern half of the lake and building waves along the 
western lakeshore. high pressure continues to build to around 30.5
inches as it lifts northeastward across ontario and quebec friday
through the weekend with easterly winds persisting across lake 
michigan. expecting winds to increase during this timeframe as 
well with a broad low pressure trough around 29.8 inches setting 
up over the plains.


lmz080-669-671-673-675-777-779-870-872-874-876-878-201515-
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-
259 am cdt wed may 20 2026

sheboygan wi to pentwater mi south...

.today...north winds 10 to 20 kt increasing to 15 to 25 kt. waves
3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.tonight...north winds 15 to 25 kt becoming northeast 10 to
20 kt. waves 4 to 6 ft occasionally to 8 ft. 
.thursday...east winds 10 to 20 kt becoming north. waves 3 to
5 ft subsiding to 2 to 4 ft. 
.thursday night...northeast winds 10 to 20 kt becoming east.
waves 3 to 5 ft. 
.friday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
chance of showers in the afternoon. waves 3 to 5 ft. 
.friday night...east winds 15 to 25 kt. showers likely. waves
4 to 6 ft occasionally to 8 ft. 
.saturday...east winds 10 to 20 kt becoming north 10 to 15 kt.
waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft. 
.sunday...south winds 5 to 10 kt. waves 1 ft or less.  

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336361

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
356 am edt wed may 20 2026 /256 am cdt wed may 20 2026/

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...west winds 5 to 15 knots backing south in the afternoon.
waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots backing northeast late.
waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves calm to 2 feet. 
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet. 
.friday night...northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...northeast winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves building to 2 to
4 feet, then subsiding to calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336362

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz263-202000-
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-
356 am edt wed may 20 2026

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southwest in the
afternoon, then backing south late. waves calm to 2 feet. 
.tonight...southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming south 5 to 15 knots late.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing east late. waves
calm to 2 feet. 
.thursday night...east winds 5 to 15 knots veering southeast
after midnight. waves calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves subsiding to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots diminishing to 5 to
15 knots. a chance of rain showers. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336363

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz264-202000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
356 am edt wed may 20 2026

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet. 
.today...northwest winds 5 to 15 knots backing southwest late.
waves subsiding to calm to 2 feet. 
.tonight...southwest winds 5 to 15 knots becoming south less than
10 knots after midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing southeast in the
afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves building to 1 to 3 feet. 
.saturday...east winds 10 to 20 knots becoming southeast 5 to
15 knots. a chance of rain showers. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336364

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz265-202000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
356 am edt wed may 20 2026

.early this morning...northwest winds 5 to 15 knots. waves 1 to
3 feet. 
.today...northwest winds 5 to 15 knots veering north in the
afternoon, then veering southeast late. waves subsiding to calm
to 2 feet. 
.tonight...southeast winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. waves calm to 2 feet. 
.thursday night...southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.friday...east winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 15 to 25 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.saturday...east winds 15 to 25 knots becoming southeast 10 to
20 knots. a chance of rain showers. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet. 
.sunday...southwest winds 10 to 20 knots backing south. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336365

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz266-202000-
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-
356 am edt wed may 20 2026

.early this morning...northwest winds 15 to 25 knots. waves 3 to
6 feet occasionally to 8 feet. 
.today...northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. waves
subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots backing south after midnight.
waves calm to 2 feet. 
.thursday...south winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 10 to 20 knots late. waves calm to
2 feet. 
.thursday night...southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. waves calm to 2 feet. 
.friday...southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. waves building to 1 to 3 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. waves building to 2 to 4 feet. 
.saturday...east winds 15 to 25 knots becoming southeast 10 to
20 knots. a chance of rain showers. waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots backing south. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 200757
glfls 
expires:202605202000;;336366

open lake forecast for lake superior
national weather service marquette mi
356 am edt wed may 20 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 30.3 inch high over the northern plains shifts over lake superior 
today and builds to 30.4 inches tonight. the high pressure shifts 
east thursday night while leaving lingering ridging of at least 30.3 
inches over lake superior through friday. a 29.9 inch low then lifts 
into the lower great lakes from the southern plains friday night and 
saturday, but 30.1 inch ridging persists over lake superior the 
remainder of the weekend.



lsz267-202000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
356 am edt wed may 20 2026

.early this morning...northwest winds 20 to 30 knots. waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.today...northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. waves subsiding to 1 to 3 feet. 
.tonight...northwest winds 5 to 15 knots veering north after
midnight, then veering south late. waves subsiding to calm to
2 feet. 
.thursday...south winds 5 to 15 knots backing northeast in the
afternoon, then veering east late. waves calm to 2 feet. 
.thursday night...southeast winds 5 to 15 knots. waves calm to
2 feet. 
.friday...east winds 5 to 15 knots. waves calm to 2 feet. 
.friday night...east winds 10 to 20 knots increasing to 15 to
25 knots after midnight. waves building to 2 to 4 feet. 
.saturday...east winds 15 to 25 knots becoming southeast 10 to
20 knots. a chance of rain showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$