fzus61 kbuf 212003
glflo 
expires:202605220300;;417233

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu may 21 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region through tonight, 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 an attendant warm front will 
then slowly approach the lake late friday night and saturday, before 
weakening and sliding eastward sunday. a 30.1 inch high will settle 
across the region monday through tuesday. a cold front associated 
with a 29.8 inch low over new england will drop south across the 
lake on wednesday.


loz063>065-220300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt thu may 21 2026

.tonight...northwest winds 5 to 10 knots becoming northeast.
waves 1 foot or less. 
.friday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 10 to 15 knots becoming southeast and
increasing to 15 to 25 knots. showers. waves 1 to 3 feet building
to 3 to 5 feet. 
.saturday night...southeast winds 15 to 25 knots. showers. waves
3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south. showers
during the day, then a chance of showers sunday night. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.monday...southwest winds 5 to 10 knots becoming light and
variable. a chance of showers during the day. waves 2 feet or
less. 
.tuesday...west winds 10 knots or less. waves 1 foot or less. 

$$

fzus61 kbuf 212003
glflo 
expires:202605220300;;417232

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt thu may 21 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 large 30.4 inch area of surface high pressure will 
build across the entire great lakes region through tonight, 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 an attendant warm front will 
then slowly approach the lake late friday night and saturday, before 
weakening and sliding eastward sunday. a 30.1 inch high will settle 
across the region monday through tuesday. a cold front associated 
with a 29.8 inch low over new england will drop south across the 
lake on wednesday.


loz062-220300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt thu may 21 2026

.tonight...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers
overnight. waves 2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.saturday night...east winds 15 to 25 knots. showers. waves 5 to
8 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 15 to 20 knots becoming southwest and
diminishing to less than 10 knots. showers during the day, then a
chance of showers sunday night. waves 3 to 6 feet subsiding to
2 feet or less. 
.monday...light and variable winds. a chance of showers during
the day. waves 1 foot or less. 
.tuesday...west winds less than 10 knots. waves 1 foot or less. 

$$

fzus61 kcle 211945
glfle 
expires:202605220215;;416692

open lake forecast for lake erie
national weather service cleveland oh
345 pm edt thu may 21 2026

for waters beyond five nautical miles of shore on lake erie

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...
high pressure 30.40 inches will shift northeast of lake erie
during the day friday. low pressure 30.00 inches will lift
northeast from the ohio valley friday night into saturday with a
warm front lifting across the lake by late saturday. a cold front
will move east across the lake sunday before high pressure 30.00
inches builds over the region as the front slows over the ohio 
valley early next week.


lez164>168-220215-
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-
345 pm edt thu may 21 2026

.tonight...northeast winds 15 to 25 knots becoming east. waves
5 to 8 feet. waves occasionally around 10 feet. 
.friday...east winds 15 to 25 knots. waves 5 to 8 feet. waves
occasionally around 10 feet. 
.friday night...east winds 15 to 25 knots. a chance of showers
overnight. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.saturday...east winds 15 to 20 knots becoming southeast.
showers. waves 3 to 6 feet. 
.saturday night...southeast winds 15 to 20 knots becoming south
10 to 15 knots. showers. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.sunday...southwest winds 10 knots or less becoming southeast. a
chance of showers sunday night. waves 2 feet or less. 
.monday...northeast winds less than 10 knots becoming east. waves
1 foot or less. 
.tuesday...east winds less than 10 knots becoming southeast.
waves 1 foot or less. 

$$

fzus61 kcle 211945
glfle 
expires:202605220215;;416693

open lake forecast for lake erie
national weather service cleveland oh
345 pm edt thu may 21 2026

for waters beyond five nautical miles of shore on lake erie

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...
high pressure 30.40 inches will shift northeast of lake erie
during the day friday. low pressure 30.00 inches will lift
northeast from the ohio valley friday night into saturday with a
warm front lifting across the lake by late saturday. a cold front
will move east across the lake sunday before high pressure 30.00
inches builds over the region as the front slows over the ohio 
valley early next week.


lez061-169-220215-
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-
345 pm edt thu may 21 2026

.tonight...northeast winds 15 to 20 knots becoming east. waves
3 to 5 feet. 
.friday...east winds 15 to 20 knots becoming northeast. waves
3 to 6 feet. 
.friday night...northeast winds 15 to 20 knots becoming east. a
chance of showers overnight. waves 3 to 5 feet subsiding to 1 to
3 feet. 
.saturday...east winds 15 to 20 knots. showers. waves 2 to
4 feet. 
.saturday night...southeast winds 15 to 20 knots. showers. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...south winds 10 to 15 knots becoming light and variable.
a chance of showers. waves 2 feet or less. 
.monday...light and variable winds. waves 1 foot or less. 
.tuesday...light and variable winds. waves 1 foot or less. 

$$

fzus61 kcle 211945
glfle 
expires:202605220215;;416691

open lake forecast for lake erie
national weather service cleveland oh
345 pm edt thu may 21 2026

for waters beyond five nautical miles of shore on lake erie

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...
high pressure 30.40 inches will shift northeast of lake erie
during the day friday. low pressure 30.00 inches will lift
northeast from the ohio valley friday night into saturday with a
warm front lifting across the lake by late saturday. a cold front
will move east across the lake sunday before high pressure 30.00
inches builds over the region as the front slows over the ohio 
valley early next week.


lez162-163-220215-
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-
345 pm edt thu may 21 2026

.tonight...east winds 15 to 25 knots. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 
.friday...east winds 20 to 25 knots. waves 3 to 6 feet building
to 4 to 7 feet. waves occasionally around 9 feet. 
.friday night...east winds 20 to 25 knots. a chance of showers in
the evening, then showers overnight. waves 4 to 7 feet subsiding
to 3 to 6 feet. waves occasionally around 9 feet. 
.saturday...east winds 15 to 25 knots diminishing to 10 to
15 knots. showers. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.saturday night...east winds 5 to 15 knots becoming west. showers
in the evening, then a chance of showers overnight. waves 1 to
2 feet. 
.sunday...west winds 10 knots or less becoming east. a chance of
showers sunday night. waves 1 foot or less. 
.monday...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.tuesday...east winds 5 to 10 knots becoming southeast. waves
1 foot or less. 

$$

fzus63 kdtx 211935
glfsc 
expires:202605220345;;416458

lake st clair forecast
national weather service detroit/pontiac mi
335 pm edt thu may 21 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 continue to slowly
shift from the northern great lakes to the eastern great lakes
through friday. northeast wind veers east and strengthen into
saturday as low pressure tracks in from the mid-mississippi
valley.


lcz460-220345-
lake st clair-
335 pm edt thu may 21 2026

...small craft advisory in effect from late tonight through
saturday morning...

.tonight...northeast winds 15 to 20 knots. partly cloudy. waves 1 to
3 feet.
.friday...east winds 20 to 25 knots diminishing to 15 to 20 knots in
the afternoon. partly sunny. waves 2 to 4 feet.
.friday night...east winds 20 to 25 knots. gusts to 30 knots in the
late evening and overnight. a chance of light showers by midnight.
rain showers after midnight. waves 2 to 4 feet.
.saturday...east winds to 30 knots diminishing to 20 to 25 knots
with gusts to 30 knots in the late morning and afternoon. showers.
waves 2 to 4 feet.
.saturday night...east winds 15 to 20 knots diminishing to 10 to 15
knots by midnight...then backing to the northeast after midnight.
showers early in the evening...then a chance of light showers by
midnight. waves 1 to 3 feet.
.sunday...west winds 5 to 10 knots backing to the southeast in the
evening. partly sunny...then partly cloudy with a chance of showers
in the evening. waves 2 feet or less.
.monday...southeast winds 5 to 10 knots. partly cloudy. a chance of
showers. waves 2 feet or less.
.tuesday...south winds 5 to 10 knots. partly cloudy. waves 2 feet or
less.

$$

fzus63 kdtx 211935
glflh 
expires:202605220345;;416454

open lake forecast for lake huron
national weather service detroit/pontiac mi
335 pm edt thu may 21 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 continue to slowly
shift from the northern great lakes to the eastern great lakes
through friday. northeast wind veers east and strengthen into
saturday as low pressure tracks in from the mid-mississippi
valley.


lhz361-220345-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
335 pm edt thu may 21 2026

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


$$

fzus63 kdtx 211935
glflh 
expires:202605220345;;416455

open lake forecast for lake huron
national weather service detroit/pontiac mi
335 pm edt thu may 21 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 continue to slowly
shift from the northern great lakes to the eastern great lakes
through friday. northeast wind veers east and strengthen into
saturday as low pressure tracks in from the mid-mississippi
valley.


lhz362-363-220345-
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-
335 pm edt thu may 21 2026

.tonight...northeast winds 5 to 10 knots becoming east 10 to
15 knots early in the morning. waves 1 to 3 feet. 
.friday...east winds 10 to 15 knots becoming northeast 15 to
20 knots late in the afternoon. waves 1 to 3 feet building to
2 to 4 feet late in the afternoon. 
.friday night...east winds 15 to 20 knots. a chance of showers
after midnight. waves 4 to 6 feet. waves occasionally around
8 feet. 
.saturday...east winds 20 to 25 knots. gusts to 30 knots in the
late morning and afternoon. showers likely. waves 6 to 9 feet.
waves occasionally around 12 feet. 
.saturday night...east winds 20 to 25 knots with gusts to around
30 knots becoming northeast 10 to 15 knots. showers likely in the
evening. waves 6 to 9 feet. waves occasionally around 12 feet. 
.sunday...east winds 5 to 10 knots veering to the southeast late
in the morning...then becoming light and variable late in the
evening. waves 3 to 5 feet subsiding to 2 feet or less late in
the afternoon. 
.monday...light and variable winds becoming southeast 5 to
10 knots. waves 2 feet or less. 
.tuesday...south winds 5 to 10 knots backing to the southeast .
waves 2 feet or less. 


$$

fzus63 kdtx 211935
glflh 
expires:202605220345;;416456

open lake forecast for lake huron
national weather service detroit/pontiac mi
335 pm edt thu may 21 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 continue to slowly
shift from the northern great lakes to the eastern great lakes
through friday. northeast wind veers east and strengthen into
saturday as low pressure tracks in from the mid-mississippi
valley.


lhz462>464-220345-
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-
335 pm edt thu may 21 2026

.tonight...north winds 15 to 20 knots becoming northeast 10 to
15 knots in the late evening and overnight. waves 3 to 5 feet
subsiding to 1 to 3 feet early in the morning. 
.friday...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.friday night...northeast winds 10 to 15 knots becoming east
15 to 20 knots in the late evening and overnight. a chance of
showers after midnight. waves 3 to 5 feet. 
.saturday...east winds 15 to 20 knots increasing to 20 to
25 knots in the late morning and afternoon. gusts to 30 knots.
showers likely in the morning...then showers in the afternoon.
waves 5 to 7 feet. waves occasionally around 10 feet. 
.saturday night...east winds 20 to 25 knots with gusts to around
30 knots decreasing to 10 to 15 knots. showers in the evening.
waves 4 to 6 feet. 
.sunday...south winds 5 to 10 knots backing to the north late in
the afternoon...then becoming light and variable late in the
evening. waves 2 to 4 feet subsiding to 2 feet or less. waves
occasionally around 8 feet. 
.monday...light and variable winds becoming east 5 to 10 knots
until early evening...then becoming light and variable by
midnight. waves 2 feet or less. 
.tuesday...light and variable winds becoming southeast 5 to
10 knots early in the evening...then becoming light and variable
by midnight. waves 2 feet or less. 


$$

fzus63 kmkx 211943
glflm 
expires:202605220315;;416687

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
243 pm cdt thu may 21 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...

high pressure of 30.4 inches centered over lake superior will 
will gradually shift eastward through the end of the week. 
persistent east to northeast winds of 10 to 20 knots are expected 
through friday, with winds becoming northerly on saturday as low 
pressure of 29.8 inches over far southern illinois lifts into 
southern michigan. winds should increase a bit friday afternoon 
into saturday, though winds will remain below gale force. 
southerly winds are then expected to develop early next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-220315-
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 thu may 21 2026

sheboygan wi to pentwater mi south...

.tonight...northeast winds 15 to 25 kt becoming east. waves 3 to
5 ft. 
.friday...east winds 15 to 25 kt becoming northeast. waves 3 to
5 ft. 
.friday night...east winds 15 to 25 kt. chance of showers
overnight. waves 4 to 6 ft occasionally to 8 ft. 
.saturday...northeast winds 15 to 25 kt becoming north 10 to
20 kt. chance of showers in the morning. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.saturday night...north winds 10 to 15 kt veering to south. waves
1 to 3 ft. 
.sunday...south winds 5 to 10 kt. waves 1 ft or less. 
.sunday night...southeast winds 5 to 10 kt becoming south. waves
1 ft or less. 
.monday...south winds 5 to 10 kt becoming southeast. waves 1 to
2 ft. 
.tuesday...south winds 5 to 10 kt becoming southeast. waves 1 to
2 ft.  

$$

fzus63 kmkx 211943
glflm 
expires:202605220315;;416686

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
243 pm cdt thu may 21 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...

high pressure of 30.4 inches centered over lake superior will 
will gradually shift eastward through the end of the week. 
persistent east to northeast winds of 10 to 20 knots are expected 
through friday, with winds becoming northerly on saturday as low 
pressure of 29.8 inches over far southern illinois lifts into 
southern michigan. winds should increase a bit friday afternoon 
into saturday, though winds will remain below gale force. 
southerly winds are then expected to develop early next week.


lmz261-362-364-366-563-565-567-868-220315-
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 thu may 21 2026

sheboygan wi to pentwater mi north...

.tonight...northeast winds 15 to 25 kt becoming east 10 to 20 kt.
waves 2 to 4 ft. 
.friday...east winds 10 to 20 kt becoming northeast to 30 kt.
waves 1 to 3 ft building to 4 to 6 ft occasionally to 8 ft. 
.friday night...east winds to 30 kt. waves 4 to 6 ft occasionally
to 8 ft subsiding to 3 to 5 ft. 
.saturday...east winds to 30 kt becoming northeast. chance of
showers. waves 4 to 6 ft occasionally to 8 ft. 
.saturday night...northeast winds to 30 kt veering to south 10 to
15 kt overnight. waves 3 to 5 ft subsiding to 1 to 3 ft. 
.sunday...south winds 5 to 10 kt becoming southwest 10 to 15 kt.
waves 1 to 2 ft. 
.sunday night...south winds 10 to 15 kt diminishing to 5 to
10 kt. waves 1 ft or less. 
.monday...south winds 10 to 15 kt. waves 1 to 2 ft. 
.tuesday...south winds 10 to 15 kt becoming southwest. waves 1 to
2 ft.  

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417108

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz264-220800-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 pm edt thu may 21 2026

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

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417109

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz265-220800-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 pm edt thu may 21 2026

.late this afternoon...east winds 15 to 25 knots. waves calm to
2 feet. 
.tonight...southeast winds 10 to 20 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.friday...southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 20 to 30 knots veering southeast after
midnight, then becoming east 15 to 25 knots late. waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.saturday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. a chance of rain showers. waves
building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. a chance of rain showers. waves
subsiding to calm to 2 feet. 
.sunday...south winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...south winds 10 to 20 knots veering southwest
after midnight. waves calm to 2 feet. 
.monday...southeast winds 10 to 20 knots veering south. waves
calm to 2 feet. 
.tuesday...east winds 5 to 15 knots veering southeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417106

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt thu may 21 2026 /300 pm cdt thu may 21 2026/

.late this afternoon...northeast winds 10 to 20 knots. waves 1 to
3 feet building to 2 to 4 feet. 
.tonight...northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. waves subsiding
to calm to 2 feet. 
.friday...east winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon, then increasing to 20 to 30 knots
late. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday night...east winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. a slight chance of rain showers through
midnight, then rain showers likely after midnight. waves
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots backing northeast by mid
afternoon. rain showers through early afternoon, then a chance of
rain showers by mid afternoon. waves subsiding to 1 to 3 feet. 
.saturday night...northeast winds 5 to 15 knots becoming north
less than 10 knots after midnight. waves subsiding to calm to
2 feet. 
.sunday...southwest winds less than 10 knots becoming south 5 to
15 knots by mid afternoon. waves calm to 2 feet. 
.sunday night...south winds 5 to 15 knots backing north after
midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots backing north. waves calm to
2 feet. 
.tuesday...southwest winds 5 to 15 knots backing northeast. waves
calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417111

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz267-220800-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 pm edt thu may 21 2026

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

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417110

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz266-220800-
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 thu may 21 2026

.late this afternoon...east winds 10 to 20 knots. waves calm to
2 feet. 
.tonight...east winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. waves building to 1 to 3 feet, then
subsiding to calm to 2 feet. 
.friday...southeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon. waves building to 2 to 4 feet. 
.friday night...east winds 15 to 25 knots. waves building to 3 to
5 feet occasionally to 7 feet. 
.saturday...southeast winds 15 to 25 knots. a chance of showers.
waves building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.sunday...south winds 5 to 15 knots. waves subsiding to calm to
2 feet. 
.sunday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.monday...south winds 5 to 15 knots increasing to 10 to 20 knots.
waves building to 1 to 3 feet, then subsiding to calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing south. waves
calm to 2 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202605220800;;417107

open lake forecast for lake superior
national weather service marquette mi
400 pm edt thu may 21 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... 

high pressure of 30.3 to 30.4 inches remains over lake superior this 
afternoon and tonight before shifting east through friday into new 
england and quebec. meanwhile, a 29.7 inch low develops over the 
plains and lifts toward the great lakes. the low gradually weakens 
to 29.9 inches as it lifts over lower michigan and the eastern great 
lakes saturday into sunday. weak troughing of 30.0 inches passes 
northward over lake superior saturday night into sunday night before 
ridging of around 30.0 inches returns on monday.



lsz263-220800-
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 thu may 21 2026

.late this afternoon...east winds 10 to 20 knots. waves calm to
2 feet building to 1 to 3 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight. waves subsiding to calm to 2 feet. 
.friday...east winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 3 to 5 feet occasionally to 7 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of rain showers after midnight.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots. rain showers likely. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...east winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. a chance of rain showers. waves
subsiding to 1 to 3 feet. 
.sunday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves subsiding to calm to 2 feet. 
.sunday night...southwest winds 5 to 15 knots. waves calm to
2 feet. 
.monday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.tuesday...southwest winds 5 to 15 knots backing east. waves calm
to 2 feet. 

$$