fzus61 kbuf 210803
glflo 
expires:202605211500;;390272

open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 and 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.


loz062-211500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt thu may 21 2026

.today...northeast winds 15 to 20 knots becoming east 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.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 5 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.sunday...southeast winds 15 to 20 knots becoming southwest and
diminishing to 10 knots or less. showers likely during the day,
then a chance of showers sunday night. waves 3 to 5 feet
subsiding to 1 foot or less. 
.monday...north winds less than 10 knots. a chance of showers
during the day. waves 1 foot or less. 

$$

fzus61 kbuf 210803
glflo 
expires:202605211500;;390273

open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 and 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.


loz063>065-211500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt thu may 21 2026

.today...northeast winds 15 to 20 knots diminishing to 5 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.tonight...north winds 5 to 10 knots becoming east. waves 1 foot
or less. 
.friday...east winds 5 to 15 knots becoming northeast. waves
2 feet or less. 
.friday night...northeast winds 10 to 15 knots becoming east.
waves 1 to 3 feet. 
.saturday...east winds 15 to 25 knots becoming southeast.
showers. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...southeast winds 15 to 25 knots becoming south. showers.
waves 3 to 6 feet subsiding to 1 to 3 feet. 
.monday...south winds 10 knots or less becoming west. showers
likely during the day. waves 2 feet or less. 

$$

fzus61 kcle 210751
glfle 
expires:202605211415;;389795

open lake forecast for lake erie
national weather service cleveland oh
351 am 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 moves across the great lakes today 
before shifting into new england on friday. low pressure 30.00 
inches will lift northeast towards lake erie on friday night and
saturday, lifting a warm front onto the lake on saturday. a cold 
front will cross lake erie on sunday before high pressure 30.20 
inches builds overhead on monday.


lez061-169-211415-
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-
351 am edt thu may 21 2026

.today...northeast winds 15 to 25 knots. waves 1 to 3 feet
building to 3 to 6 feet. 
.tonight...northeast winds 15 to 25 knots becoming east. waves
3 to 5 feet. 
.friday...east winds 15 to 25 knots becoming northeast. waves
3 to 6 feet. 
.friday night...east winds 15 to 20 knots. a chance of showers in
the evening, then showers overnight. waves 3 to 5 feet subsiding
to 1 to 3 feet. 
.saturday...east winds 15 to 25 knots becoming south. showers.
waves 2 to 4 feet. 
.sunday...south winds 5 to 15 knots diminishing to less than
10 knots. a chance of showers during the day, then showers likely
sunday night. waves 2 feet or less. 
.monday...west winds less than 10 knots. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 210751
glfle 
expires:202605211415;;389794

open lake forecast for lake erie
national weather service cleveland oh
351 am 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 moves across the great lakes today 
before shifting into new england on friday. low pressure 30.00 
inches will lift northeast towards lake erie on friday night and
saturday, lifting a warm front onto the lake on saturday. a cold 
front will cross lake erie on sunday before high pressure 30.20 
inches builds overhead on monday.


lez164>168-211415-
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-
351 am edt thu may 21 2026

.today...northeast winds 15 to 25 knots. waves 2 to 4 feet
building to 5 to 8 feet. waves occasionally around 10 feet. 
.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. showers likely in the
evening, then showers overnight. waves 5 to 8 feet subsiding to
3 to 6 feet. waves occasionally around 10 feet. 
.saturday...southeast winds 15 to 25 knots becoming south.
showers during the day, then showers likely saturday night. waves
3 to 6 feet subsiding to 2 to 4 feet. 
.sunday...southwest winds 10 knots or less becoming south. a
chance of showers. waves 2 feet or less. 
.monday...northwest winds 10 knots or less becoming east. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 210751
glfle 
expires:202605211415;;389793

open lake forecast for lake erie
national weather service cleveland oh
351 am 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 moves across the great lakes today 
before shifting into new england on friday. low pressure 30.00 
inches will lift northeast towards lake erie on friday night and
saturday, lifting a warm front onto the lake on saturday. a cold 
front will cross lake erie on sunday before high pressure 30.20 
inches builds overhead on monday.


lez162-163-211415-
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-
351 am edt thu may 21 2026

.today...northeast winds 15 to 25 knots becoming east. waves 2 to
4 feet building to 4 to 7 feet. waves occasionally around 9 feet.
.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. a chance of showers in the
afternoon. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.friday night...east winds 20 to 25 knots. showers likely in the
evening, then showers overnight. waves 4 to 7 feet subsiding to
3 to 6 feet. waves occasionally around 9 feet. 
.saturday...southeast winds 15 to 25 knots becoming west and
diminishing to 5 to 15 knots. showers during the day. waves 3 to
5 feet subsiding to 2 feet or less. 
.sunday...southwest winds 5 to 10 knots becoming northwest. a
chance of showers and thunderstorms during the day, then a chance
of showers sunday night. waves 1 foot or less. 
.monday...north winds 10 knots or less becoming east. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 210754
glfsc 
expires:202605211600;;389903

lake st clair forecast
national weather service detroit/pontiac mi
354 am 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 slowly track
eastward across the northern great lakes through friday morning.
northeast wind veers east then strengthens late friday into
saturday as low pressure tracks in from the mid mississippi
valley.


lcz460-211600-
lake st clair-
354 am edt thu may 21 2026

.today...northeast winds 10 to 15 knots. mostly sunny. waves 2 feet
or less.
.tonight...northeast winds 15 to 20 knots diminishing to 10 to 15
knots by midnight...then becoming east 15 to 20 knots early in the
morning. mostly clear. waves 1 to 3 feet.
.friday...east winds 15 to 20 knots. partly sunny. waves 2 to 4
feet.
.friday night...east winds 15 to 20 knots increasing to 20 to 25
knots with gusts to 30 knots after midnight. a chance of light
showers ...then showers after midnight. waves 2 to 4 feet. a small
craft advisory may be needed.
.saturday...east winds to 30 knots becoming southeast 15 to 20 
knots. showers...then a chance of light showers in the evening. 
waves 2 to 4 feet subsiding to 1 to 3 feet in the evening.
.sunday...south winds 10 to 15 knots. mostly cloudy with a chance of
showers. waves 2 feet or less.
.monday...east winds 5 to 10 knots. partly cloudy. a chance of
showers. waves 2 feet or less.

$$

fzus63 kdtx 210754
glflh 
expires:202605211600;;389898

open lake forecast for lake huron
national weather service detroit/pontiac mi
354 am 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 slowly track
eastward across the northern great lakes through friday morning.
northeast wind veers east then strengthens late friday into
saturday as low pressure tracks in from the mid mississippi
valley.


lhz362-363-211600-
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-
354 am edt thu may 21 2026

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


$$

fzus63 kdtx 210754
glflh 
expires:202605211600;;389897

open lake forecast for lake huron
national weather service detroit/pontiac mi
354 am 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 slowly track
eastward across the northern great lakes through friday morning.
northeast wind veers east then strengthens late friday into
saturday as low pressure tracks in from the mid mississippi
valley.


lhz361-211600-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
354 am edt thu may 21 2026

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


$$

fzus63 kdtx 210754
glflh 
expires:202605211600;;389899

open lake forecast for lake huron
national weather service detroit/pontiac mi
354 am 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 slowly track
eastward across the northern great lakes through friday morning.
northeast wind veers east then strengthens late friday into
saturday as low pressure tracks in from the mid mississippi
valley.


lhz462>464-211600-
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-
354 am edt thu may 21 2026

.today...northeast winds 10 to 15 knots. waves 2 to 4 feet. 
.tonight...northeast winds 10 to 15 knots veering to the east
early in the morning. waves 2 to 4 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...east winds 10 to 15 knots increasing to 15 to
20 knots after midnight. showers likely after midnight. waves
4 to 6 feet. 
.saturday...east winds 20 to 25 knots with gusts to 30 knots  
becoming southeast 10 to 15 knots late in the evening. showers. a 
chance of showers late in the afternoon. waves 5 to 7 feet. waves 
occasionally around 10 feet. 
.sunday...southwest winds 5 to 10 knots backing to the southeast
. a chance of showers. waves 2 feet or less. 
.monday...light and variable winds becoming north 5 to 10 knots
early in the evening...then becoming light and variable by
midnight. waves 2 feet or less. 


$$

fzus63 kmkx 210835
glflm 
expires:202605211515;;391700

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
335 am 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...

no major changes to the going 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 lifts northeast into southern michigan. 
winds could increase a bit friday night into saturday, depending 
on the exact track and strength of the low, though winds are 
likely to stay below gale force. southerly winds are then expected
to develop early next week.


lmz080-669-671-673-675-777-779-870-872-874-876-878-211515-
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-
335 am cdt thu may 21 2026

sheboygan wi to pentwater mi south...

.today...northeast winds 10 to 20 kt becoming north 15 to 25 kt.
waves 3 to 5 ft subsiding to 2 to 4 ft. 
.tonight...northeast winds 15 to 25 kt becoming east 10 to 20 kt.
waves 3 to 5 ft. 
.friday...east winds 10 to 20 kt becoming northeast 15 to 25 kt.
waves 3 to 5 ft. 
.friday night...east winds 15 to 25 kt. chance of showers in the
evening, then 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. waves 4 to 6 ft occasionally to 8 ft
subsiding to 3 to 5 ft. 
.saturday night...north winds 10 to 15 kt veering to south. waves
1 to 3 ft subsiding to 1 to 2 ft. 
.sunday...south winds 5 to 10 kt. waves 1 to 2 ft. 
.monday...northeast winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft.  

$$

fzus63 kmkx 210835
glflm 
expires:202605211515;;391699

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
335 am 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...

no major changes to the going 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 lifts northeast into southern michigan. 
winds could increase a bit friday night into saturday, depending 
on the exact track and strength of the low, though winds are 
likely to stay below gale force. southerly winds are then expected
to develop early next week.


lmz261-362-364-366-563-565-567-868-211515-
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-
335 am cdt thu may 21 2026

sheboygan wi to pentwater mi north...

.today...northeast winds 10 to 20 kt. waves 1 to 3 ft. 
.tonight...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.
showers likely overnight. waves 4 to 6 ft occasionally to 8 ft. 
.saturday...east winds to 30 kt becoming northeast. showers
likely in the morning, then chance of showers in the afternoon.
waves 4 to 7 ft occasionally to 9 ft. 
.saturday night...northeast winds to 30 kt veering to south 10 to
15 kt. waves 4 to 6 ft occasionally to 8 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. 
.monday...southwest winds 5 to 10 kt increasing to 10 to 15 kt.
waves 1 to 2 ft.  

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390123

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz266-212000-
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 am edt thu may 21 2026

.early this morning...south winds 5 to 15 knots. waves calm to
2 feet. 
.today...south winds 5 to 15 knots backing east in the afternoon.
waves calm to 2 feet. 
.tonight...southeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves 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. a slight chance of
rain showers after midnight. waves building to 3 to 5 feet
occasionally to 7 feet. 
.saturday...east winds 15 to 25 knots. showers likely through
early afternoon, then a chance of showers by mid afternoon. waves
building to 3 to 6 feet occasionally to 8 feet. 
.saturday night...southeast winds 15 to 25 knots becoming south
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to 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. 

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390124

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz267-212000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
400 am edt thu may 21 2026

.early this morning...north winds less than 10 knots. waves calm
to 2 feet. 
.today...southeast winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. waves calm to
2 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight, then increasing to 10 to 20 knots late. waves calm to
2 feet. 
.friday...east winds 10 to 20 knots. waves building to 1 to
3 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 20 to 30 knots veering southeast by mid
afternoon. 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 calm to 2 feet. 
.sunday...south winds 5 to 15 knots veering southwest. waves calm
to 2 feet. 
.monday...southeast winds 5 to 15 knots veering south. waves calm
to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390121

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz264-212000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
400 am edt thu may 21 2026

.early this morning...south winds less than 10 knots. waves calm
to 2 feet. 
.today...south winds less than 10 knots becoming southeast 5 to
15 knots in the afternoon. 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 1 to 3 feet. 
.friday night...east winds 10 to 20 knots. waves building to 2 to
4 feet. 
.saturday...east winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. rain showers likely. 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...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.monday...south winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390120

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz263-212000-
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 am edt thu may 21 2026

.early this morning...south winds 5 to 15 knots. waves calm to
2 feet. 
.today...south winds 5 to 15 knots backing northeast in the
afternoon, then veering east late. waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots veering southeast after
midnight. waves building to 1 to 3 feet, then 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 through early
afternoon, then a chance of rain showers by mid afternoon. waves
building to 3 to 5 feet occasionally to 7 feet. 
.saturday night...east winds 5 to 15 knots veering west after
midnight. waves subsiding to 1 to 3 feet. 
.sunday...southwest winds 5 to 15 knots. waves subsiding to calm
to 2 feet. 
.monday...southwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390119

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz162-212000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt thu may 21 2026 /300 am cdt thu may 21 2026/

.early this morning...northeast winds 5 to 15 knots. waves calm
to 2 feet. 
.today...east winds 5 to 15 knots increasing to 10 to 20 knots
late. waves building to 1 to 3 feet. 
.tonight...northeast winds 5 to 15 knots 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. waves building to 3 to 6 feet
occasionally to 8 feet. 
.friday night...east winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. a chance of rain showers. waves
subsiding to 2 to 4 feet. 
.saturday...east winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. rain showers likely 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 west
less than 10 knots after midnight. waves subsiding to calm to
2 feet. 
.sunday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots backing northeast. waves calm
to 2 feet. 

$$

fzus63 kmqt 210801
glfls 
expires:202605212000;;390122

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

a 30.4 inch high pressure remains over lake superior 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 before ridging of around 30.0 inches 
returns on monday.



lsz265-212000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
400 am edt thu may 21 2026

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

$$