fzus61 kbuf 121402
glflo 
expires:202605122100;;438102

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue may 12 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 30.3 inch high over the lower great lakes today will 
drift to the eastern seaboard through tonight. a 29.7 inch low over 
the central great lakes tonight will move to near the north shore of 
lake ontario by wednesday evening, then weaken into a trough over 
eastern new york and new england thursday. a 30.1 inch high will 
then build from the central great lakes and ohio valley thursday 
night to the lower great lakes and mid atlantic friday, then off the 
carolina coast saturday.


loz062-122100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt tue may 12 2026

.this afternoon...east winds 10 knots or less. waves 1 foot or
less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers early, then showers from late
evening on. waves 2 feet or less building to 2 to 3 feet. 
.wednesday...south winds 15 to 20 knots becoming southwest.
showers. waves 2 to 4 feet. 
.wednesday night...southwest winds 10 to 15 knots becoming west.
a chance of showers in the evening. waves 1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 
.friday...northwest winds 5 to 15 knots becoming southwest. waves
1 to 2 feet. 
.saturday...southwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 

$$

fzus61 kbuf 121402
glflo 
expires:202605122100;;438103

open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt tue may 12 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 30.3 inch high over the lower great lakes today will 
drift to the eastern seaboard through tonight. a 29.7 inch low over 
the central great lakes tonight will move to near the north shore of 
lake ontario by wednesday evening, then weaken into a trough over 
eastern new york and new england thursday. a 30.1 inch high will 
then build from the central great lakes and ohio valley thursday 
night to the lower great lakes and mid atlantic friday, then off the 
carolina coast saturday.


loz063>065-122100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt tue may 12 2026

.this afternoon...northwest winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.tonight...east winds 5 to 15 knots becoming southeast 15 to
20 knots. a chance of showers. showers late. waves 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots becoming south.
showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.wednesday night...southwest winds 5 to 15 knots becoming west.
showers in the evening, then a chance of showers overnight. waves
1 to 3 feet. 
.thursday...west winds 5 to 10 knots becoming northwest. a chance
of showers during the day. waves 2 feet or less. 
.friday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.saturday...south winds 10 to 15 knots becoming west. waves 1 to
3 feet. 

$$

fzus61 kcle 121346
glfle 
expires:202605122030;;437614

open lake forecast for lake erie
national weather service cleveland oh
946 am edt tue may 12 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 warm front will cross the lake today. low pressure 29.60 inches
will move southeast across the great lakes tonight into wednesday.
this low will extend a cold front across the lake by wednesday
night. a trough averaging 29.90 inches will remain across the lake
on thursday. high pressure 30.10 inches will move through the
region thursday night into friday. a warm front will move across
the lake on friday night into saturday.


lez061-168-169-122030-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
946 am edt tue may 12 2026

.this afternoon...east winds less than 10 knots becoming
northeast. waves 1 foot or less. 
.tonight...east winds 5 to 10 knots becoming south and increasing
to 15 to 20 knots. a slight chance of showers early, then a
chance of showers late in the evening. showers with a slight
chance of thunderstorms after midnight. waves 1 foot or less
building to 1 to 3 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west.
showers in the morning. waves 3 to 5 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.wednesday night...west winds 15 to 20 knots. a chance of
showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...northwest winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.friday...northwest winds 10 knots or less becoming south. waves
2 feet or less. 
.saturday...southwest winds 5 to 15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 121346
glfle 
expires:202605122030;;437612

open lake forecast for lake erie
national weather service cleveland oh
946 am edt tue may 12 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 warm front will cross the lake today. low pressure 29.60 inches
will move southeast across the great lakes tonight into wednesday.
this low will extend a cold front across the lake by wednesday
night. a trough averaging 29.90 inches will remain across the lake
on thursday. high pressure 30.10 inches will move through the
region thursday night into friday. a warm front will move across
the lake on friday night into saturday.


lez162>164-122030-
detroit river lt. to maumee bay oh to reno beach oh beyond 5nm
offshoreline to us-canadian border-
reno beach to the islands oh beyond 5nm off shoreline to us-
canadian border-
the islands to vermilion oh beyond 5 nm off shoreline to us-
canadian border-
946 am edt tue may 12 2026

.this afternoon...southeast winds 5 to 10 knots becoming east.
waves 1 foot or less. 
.tonight...southeast winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. a slight chance of showers early,
then a chance of showers with a slight chance of thunderstorms
late in the evening. showers with a slight chance of
thunderstorms after midnight. waves 1 to 3 feet building to 2 to
4 feet. 
.wednesday...southwest winds 15 to 20 knots becoming west. waves
2 to 4 feet building to 3 to 5 feet. 
.wednesday night...northwest winds 15 to 20 knots. a chance of
showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...northwest winds 15 to 20 knots becoming north and
diminishing to less than 10 knots. waves 2 to 4 feet subsiding to
1 foot or less. 
.friday...southwest winds 10 knots or less becoming south 10 to
15 knots. waves 2 feet or less. 
.saturday...southwest winds 5 to 15 knots. a chance of showers
saturday night. waves 1 to 2 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 121346
glfle 
expires:202605122030;;437613

open lake forecast for lake erie
national weather service cleveland oh
946 am edt tue may 12 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 warm front will cross the lake today. low pressure 29.60 inches
will move southeast across the great lakes tonight into wednesday.
this low will extend a cold front across the lake by wednesday
night. a trough averaging 29.90 inches will remain across the lake
on thursday. high pressure 30.10 inches will move through the
region thursday night into friday. a warm front will move across
the lake on friday night into saturday.


lez165>167-122030-
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-
946 am edt tue may 12 2026

.this afternoon...east winds 10 knots or less. waves 1 foot or
less. 
.tonight...southeast winds 5 to 10 knots becoming southwest and
increasing to 15 to 20 knots. a slight chance of showers early,
then a chance of showers with a slight chance of thunderstorms
late in the evening. showers with a slight chance of
thunderstorms after midnight. waves 1 foot or less building to
3 to 6 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west. a
chance of showers in the morning. waves 3 to 6 feet building to
4 to 7 feet. waves occasionally around 9 feet. 
.wednesday night...west winds 15 to 20 knots becoming northwest.
a chance of showers in the evening, then showers likely
overnight. waves 3 to 5 feet. 
.thursday...northwest winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers during the day. waves 3 to 5 feet
subsiding to 1 to 3 feet. 
.friday...west winds 10 knots or less becoming south 10 to
15 knots. waves 2 feet or less. 
.saturday...southwest winds 5 to 15 knots. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 121359
glflh 
expires:202605122200;;437966

open lake forecast for lake huron
national weather service detroit/pontiac mi
959 am edt tue may 12 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...low pressure of 29.70 inches will track west to east
across the northern great lakes through wednesday. this system
will bring increasing south winds this afternoon and evening,
followed by gusty west and northwest winds for wednesday. showers
and a few thunderstorms accompany the arrival of this system this
evening and into the overnight hours.


lhz363-462>464-122200-
lake huron from sturgeon point to alabaster mi beyond 5nm off
shore-
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-
959 am edt tue may 12 2026

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


$$

fzus63 kdtx 121359
glfsc 
expires:202605122200;;437939

lake st clair forecast
national weather service detroit/pontiac mi
959 am edt tue may 12 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...low pressure of 29.70 inches will track west to east
across the northern great lakes through wednesday. this system
will bring increasing south winds this afternoon and evening,
followed by gusty west and northwest winds for wednesday. showers
and a few thunderstorms accompany the arrival of this system this
evening and into the overnight hours.


lcz460-122200-
lake st clair-
959 am edt tue may 12 2026

...small craft advisory in effect from this evening through
wednesday evening...

.rest of today...southeast winds 5 to 10 knots increasing to 10 to
15 knots in the afternoon. mostly cloudy. waves 2 feet or less.
.tonight...south winds 15 to 20 knots veering to the southwest early
in the morning. mostly cloudy. showers likely and a chance of
thunderstorms. waves 1 to 3 feet.
.wednesday...west winds 15 to 20 knots. partly sunny. waves 1 to 3
feet.
.wednesday night...northwest winds 15 to 20 knots. mostly cloudy.
waves 1 to 3 feet.
.thursday...north winds 15 to 20 knots diminishing to 10 to 15 knots
in the evening. partly cloudy then clearing. waves 1 to 3 feet.
.friday...south winds 10 to 15 knots. partly cloudy. waves 2 feet or
less.
.saturday...west winds 10 to 15 knots. mostly clear. waves 2 feet or
less.

$$

fzus63 kdtx 121359
glflh 
expires:202605122200;;437965

open lake forecast for lake huron
national weather service detroit/pontiac mi
959 am edt tue may 12 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...low pressure of 29.70 inches will track west to east
across the northern great lakes through wednesday. this system
will bring increasing south winds this afternoon and evening,
followed by gusty west and northwest winds for wednesday. showers
and a few thunderstorms accompany the arrival of this system this
evening and into the overnight hours.


lhz361-362-122200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
959 am edt tue may 12 2026

.rest of today...southeast winds 10 to 15 knots increasing to
15 to 20 knots in the afternoon. showers in the afternoon. waves
1 to 3 feet building to 4 to 6 feet in the afternoon. waves
occasionally around 8 feet. 
.tonight...southeast winds 20 to 25 knots with gusts to around
30 knots becoming east 15 to 20 knots early in the morning.
showers in the evening...then a chance of showers after midnight.
waves 8 to 12 feet. waves occasionally around 15 feet. 
.wednesday...northwest winds 15 to 20 knots. a chance of showers.
waves 5 to 7 feet. waves occasionally around 10 feet. 
.wednesday night...northwest winds 15 to 20 knots. a chance of
showers in the evening. waves 5 to 7 feet. waves occasionally
around 10 feet. 
.thursday...northwest winds 15 to 20 knots becoming north 10 to
15 knots late in the morning...then becoming west 5 to 10 knots
late in the afternoon. waves 3 to 5 feet subsiding to 1 to 3 feet
late in the evening. 
.friday...south winds 5 to 10 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 3 to 5 feet . 
.saturday...southwest winds 15 to 20 knots veering to the west
early in the evening...then becoming northwest 10 to 15 knots by
midnight. a chance of showers early in the morning. waves 3 to
5 feet. 


$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437972

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz080-673-675-777-779-874-876-878-122130-
lake michigan from michigan city in to st. joseph mi 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 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-
859 am cdt tue may 12 2026

north point light wi to grand haven mi south...

.rest of today...south winds 15 to 25 kt increasing to up to 30 
kt. chance of rain showers through mid morning, then chance of 
rain showers and thunderstorms this afternoon. waves 1 to 3 ft 
building to 5 to 8 ft occasionally to 10 ft. 
.tonight...southwest winds to 30 kt veering to northwest. chance
of showers and thunderstorms in the evening. waves 5 to 8 ft
occasionally to 10 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds to 30 kt diminishing to 10 to
20 kt overnight. waves 5 to 8 ft occasionally to 10 ft subsiding
to 3 to 5 ft. 
.thursday...north winds 10 to 20 kt. waves 2 to 4 ft subsiding to
1 to 3 ft. 
.thursday night...east winds 10 to 15 kt becoming south. waves
1 to 3 ft. 
.friday...south winds 15 to 25 kt. chance of showers. waves 4 to
6 ft occasionally to 8 ft. 
.saturday...southwest winds 10 to 20 kt becoming south 10 to
15 kt. waves 2 to 4 ft subsiding to 1 to 3 ft.  

$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437969

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz261-362-122130-
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-
859 am cdt tue may 12 2026

rock island passage to charlevoix mi north...

.rest of today...south winds 15 to 25 kt becoming southeast to
30 kt. rain showers through mid morning, then rain showers likely
with slight chance of thunderstorms this afternoon. waves 1 to
3 ft building to 6 to 9 ft occasionally to 12 ft. 
.tonight...southeast winds 15 to 25 kt backing to northwest to
30 kt. chance of rain showers and slight chance of thunderstorms
in the evening, then chance of rain showers overnight. waves 6 to
9 ft occasionally to 12 ft subsiding to 4 to 6 ft occasionally to
8 ft. 
.wednesday...northwest winds to 30 kt diminishing to 15 to 25 kt.
waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. 
.wednesday night...northwest winds 15 to 25 kt diminishing to
10 to 20 kt. waves 3 to 5 ft subsiding to 1 to 3 ft. 
.thursday...north winds 10 to 15 kt backing to west. waves 1 to
2 ft. 
.thursday night...southwest winds 5 to 10 kt becoming south 10 to
20 kt. waves 1 to 2 ft. 
.friday...south winds to 30 kt becoming southwest. chance of rain
showers. waves 4 to 6 ft occasionally to 8 ft building to 6 to
9 ft occasionally to 12 ft. 
.saturday...southwest winds 15 to 25 kt becoming west. waves 4 to
7 ft occasionally to 9 ft subsiding to 3 to 5 ft.  

$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437970

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz364-366-563-565-567-868-122130-
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-
859 am cdt tue may 12 2026

rock island passage to charlevoix mi south to sheboygan wi to
pentwater mi...

...gale warning in effect until 5 pm cdt this afternoon...

.rest of today...south winds 15 to 25 kt increasing to gales to
35 kt. rain showers through mid morning, then chance of rain
showers and slight chance of thunderstorms this afternoon. waves
2 to 4 ft building to 8 to 12 ft occasionally to 16 ft. 
.tonight...southwest winds to 30 kt becoming west 10 to 20 kt
late in the evening, then becoming northwest 15 to 25 kt after
midnight increasing to 30 kt late. chance of rain showers and
slight chance of thunderstorms in the evening, then slight chance
of rain showers overnight. waves 7 to 10 ft occasionally to 13 ft
subsiding to 4 to 7 ft occasionally to 9 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds 15 to 25 kt diminishing to 10 to
20 kt. waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft. 
.thursday...north winds 10 to 15 kt increasing to 10 to 20 kt.
waves 1 to 3 ft. 
.thursday night...south winds 5 to 10 kt increasing to 10 to
20 kt. waves 1 ft or less building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally
to 12 ft. 
.saturday...southwest winds 15 to 25 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.  

$$

fzus63 kmkx 121359
glflm 
expires:202605122130;;437971

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
859 am cdt tue may 12 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...

low pressure of 29.7 inches over northern minnesota this morning
will reach northern lake michigan early this evening and lake
huron by early wednesday morning. an associated cold front will
approach the lake today, moving through this evening. south to
southwest winds will increase today as the front approaches, with
a few gales possible across central and northern portions of the 
lake through late afternoon. showers and a few storms will be
possible ahead of and along the front today. 

gusty west to northwest winds will arrive behind the cold front 
tonight into wednesday. gusts could approach gale force for a time
tonight into early wednesday, but are expected to mainly stay 
below gales. lighter northerly winds are then likely thursday as 
high pressure of 30.2 inches moves overhead. breezy southerly 
winds are expected to develop friday ahead of the next approaching
low pressure system. 


lmz669-671-870-872-122130-
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 whitehall to pentwater mi 5 nm offshore to mid
lake-
lake michigan from grand haven to whitehall mi 5 nm offshore to
mid lake-
859 am cdt tue may 12 2026

sheboygan wi to pentwater mi south to north point light wi to
grand haven mi...

...gale warning in effect until 5 pm cdt this afternoon...

.rest of today...south winds 15 to 25 kt increasing to up to 30 
kt. rain showers likely through mid morning, then chance of rain 
showers and thunderstorms this afternoon. waves 1 to 3 ft building
to 8 to 11 ft occasionally to 14 ft. 
.tonight...southwest winds to 30 kt veering to northwest. chance
of rain showers and thunderstorms in the evening. waves 6 to 9 ft
occasionally to 12 ft subsiding to 5 to 8 ft occasionally to
10 ft. 
.wednesday...northwest winds to 30 kt becoming north. waves 6 to
9 ft occasionally to 12 ft. 
.wednesday night...north winds to 30 kt diminishing to 10 to
20 kt overnight. waves 4 to 7 ft occasionally to 9 ft subsiding
to 2 to 4 ft. 
.thursday...north winds 10 to 20 kt. waves 1 to 3 ft. 
.thursday night...east winds 10 to 15 kt becoming south 10 to
20 kt. waves 1 to 2 ft building to 2 to 4 ft. 
.friday...south winds to 30 kt. chance of rain showers. waves
4 to 7 ft occasionally to 9 ft building to 5 to 8 ft occasionally
to 10 ft. 
.saturday...southwest winds 10 to 20 kt. waves 3 to 5 ft
subsiding to 2 to 4 ft.  

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438094

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt tue may 12 2026 /901 am cdt tue may 12 2026/

.rest of today...east winds 10 to 20 knots backing north late. a
chance of rain showers. waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
a slight chance of rain showers. waves subsiding to calm to
2 feet. 
.wednesday...northwest winds 5 to 15 knots backing west in the
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots veering east after
midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. waves calm to 2 feet. 
.thursday night...east winds 10 to 20 knots becoming south 20 to
30 knots after midnight. rain showers likely. waves building to
3 to 5 feet occasionally to 7 feet. 
.friday...southwest winds 15 to 25 knots veering west. waves
subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 25 knots becoming northeast 10 to
20 knots. waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438095

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz263-122000-
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-
1001 am edt tue may 12 2026

.rest of today...southeast winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon, then backing north late. rain
showers by late morning, then a chance of rain showers by mid
afternoon. waves 2 to 4 feet building to 4 to 7 feet occasionally
to 9 feet. 
.tonight...north winds 15 to 25 knots becoming northwest 10 to
20 knots late. a slight chance of rain showers through midnight.
waves subsiding to 2 to 4 feet. 
.wednesday...northwest winds 5 to 15 knots backing west late.
waves subsiding to calm to 2 feet. 
.wednesday night...northwest winds 5 to 15 knots becoming
southeast less than 10 knots after midnight. waves calm to
2 feet. 
.thursday...east winds less than 10 knots increasing to 10 to
20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. rain showers likely after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 15 to 25 knots becoming west 20 to
30 knots. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming east 10 to 20 knots.
waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438096

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz264-122000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...

.rest of today...southeast winds 20 to 30 knots increasing to
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. rain showers. a slight chance of snow showers by
mid afternoon. waves 3 to 6 feet occasionally to 8 feet building
to 5 to 8 feet occasionally to 10 feet. 
.tonight...northeast winds 15 to 25 knots backing north after
midnight. a slight chance of snow showers through midnight. a
chance of rain showers. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.wednesday...northwest winds 10 to 20 knots. waves subsiding to
1 to 3 feet. 
.wednesday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.thursday...east winds less than 10 knots becoming southeast
10 to 20 knots by mid afternoon. waves calm to 2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
20 to 30 knots after midnight. a chance of rain showers after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.friday...south winds 20 to 30 knots veering southwest. a chance
of rain showers. waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet. 
.saturday...west gales to 35 knots becoming northeast 5 to
15 knots. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438097

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz265-122000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...
...gale watch in effect from wednesday morning through wednesday
afternoon...

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

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438098

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz266-122000-
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-
1001 am edt tue may 12 2026

...gale warning in effect until 6 pm edt this evening...
...gale watch in effect from wednesday morning through wednesday
afternoon...

.rest of today...south winds 20 to 30 knots becoming southeast
gales to 35 knots in the afternoon, then diminishing to 20 to
30 knots late. rain showers. waves 4 to 8 feet occasionally to
10 feet. 
.tonight...east winds 20 to 30 knots backing north after
midnight. rain showers likely through midnight, then a chance of
rain showers after midnight. waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet. 
.wednesday...north winds 20 to 30 knots backing northwest in the
afternoon. a slight chance of rain showers through early
afternoon. waves subsiding to 3 to 6 feet occasionally to 8 feet.
.wednesday night...northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. waves subsiding to 1 to 3 feet. 
.thursday...north winds less than 10 knots becoming southeast
10 to 20 knots by mid afternoon. waves subsiding to calm to
2 feet. 
.thursday night...southeast winds 15 to 25 knots becoming south
gales to 35 knots after midnight. a chance of rain showers after
midnight. waves building to 4 to 7 feet occasionally to 9 feet. 
.friday...south gales to 40 knots. a chance of rain showers.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west gales to 35 knots becoming northwest 10 to
20 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 121402
glfls 
expires:202605122000;;438099

open lake forecast for lake superior
national weather service marquette mi
1001 am edt tue may 12 2026

for waters beyond 5 nautical miles of shore on lake superior.

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

.synopsis... 

a 29.7 inch clipper low near duluth this morning will move across 
upper michigan through this evening. as the clipper departs eastward 
early wednesday, ridging moves back over lake superior and builds to 
30.1 inches wednesday night into thursday. this ridging is pressed 
southeast to the lower great lakes late thursday into friday while a 
29.1 inch low emanates off the canadian rockies. this low is 
expected to bring troughing of 29.6 inches over lake superior friday 
into friday night as it tracks to near james bay at 29.3 inches by 
saturday morning. ridging of 30.1 inches builds over the lake from 
northern ontario saturday night into sunday, followed by another 
29.7 inch trough extending from the central plains early next week.



lsz267-122000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt tue may 12 2026

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

$$