fzus61 kbuf 180810
glflo 
expires:202605181500;;757844

open lake forecast for lake ontario
national weather service buffalo ny
410 am edt mon may 18 2026

for waters beyond five nautical miles of shore on lake ontario

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

.synopsis...an area of low pressure will develop over the central 
plains today. the low will weaken from 29.4 inches to 29.6 inches as 
it tracks northeast to the upper great lakes tonight into tuesday 
morning, then to central quebec wednesday while strengthening to 
29.4 inches. a cold front attendant to this low will cross the lake 
late tuesday night into wednesday morning. a large 30.4 inch high 
will then build across the entire great lakes region wednesday night 
through thursday. high pressure will move to the east and weaken to 
30.1 inches friday.


loz063>065-181500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
410 am edt mon may 18 2026

.today...south winds 5 to 15 knots. waves 2 feet or less. 
.tonight...south winds 5 to 10 knots becoming southwest. a chance
of showers late in the evening. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms. waves 2 to 4 feet
building to 3 to 5 feet. 
.wednesday...west winds 15 to 25 knots becoming northwest.
showers likely during the day. waves 3 to 5 feet building to 4 to
7 feet, then subsiding to 3 to 5 feet. waves occasionally around
9 feet. 
.thursday...north winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 15 knots becoming southeast. a chance
of showers friday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kbuf 180810
glflo 
expires:202605181500;;757843

open lake forecast for lake ontario
national weather service buffalo ny
410 am edt mon may 18 2026

for waters beyond five nautical miles of shore on lake ontario

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

.synopsis...an area of low pressure will develop over the central 
plains today. the low will weaken from 29.4 inches to 29.6 inches as 
it tracks northeast to the upper great lakes tonight into tuesday 
morning, then to central quebec wednesday while strengthening to 
29.4 inches. a cold front attendant to this low will cross the lake 
late tuesday night into wednesday morning. a large 30.4 inch high 
will then build across the entire great lakes region wednesday night 
through thursday. high pressure will move to the east and weaken to 
30.1 inches friday.


loz062-181500-
lake ontario open waters from the niagara river to hamlin beach-
410 am edt mon may 18 2026

.today...south winds 5 to 15 knots becoming southwest 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers after midnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tuesday...southwest winds 15 to 25 knots. waves 1 to 3 feet
building to 3 to 6 feet. 
.tuesday night...southwest winds 15 to 25 knots becoming west.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 3 to 6 feet. 
.wednesday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of showers during the day. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.friday...east winds 10 to 15 knots. a chance of showers friday
night. waves 2 feet or less building to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180743
glfle 
expires:202605181415;;756329

open lake forecast for lake erie
national weather service cleveland oh
343 am edt mon may 18 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...
southerly flow continues across the region through tuesday. low
pressure 29.70 inches tracks through the northern great lakes on
tuesday, pulling a cold front southeast across lake erie late
tuesday night and early wednesday morning. high pressure 30.40
inches builds into the great lakes wednesday and thursday, exiting
to the east across new england on friday. 


lez165>168-181415-
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-
343 am edt mon may 18 2026

.today...south winds 10 to 15 knots becoming southwest. waves
1 to 3 feet. 
.tonight...southwest winds 10 to 15 knots. a chance of showers
and thunderstorms late in the evening. a chance of showers with a
slight chance of thunderstorms after midnight. waves 1 to 3 feet.
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of showers and thunderstorms in the afternoon.
waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west
10 to 15 knots. showers with thunderstorms likely in the evening,
then showers overnight. waves 2 to 4 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast 15 to
20 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. waves
1 to 3 feet. 
.friday...east winds 10 to 15 knots becoming southeast. a chance
of showers during the day, then showers likely friday night.
waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180743
glfle 
expires:202605181415;;756330

open lake forecast for lake erie
national weather service cleveland oh
343 am edt mon may 18 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...
southerly flow continues across the region through tuesday. low
pressure 29.70 inches tracks through the northern great lakes on
tuesday, pulling a cold front southeast across lake erie late
tuesday night and early wednesday morning. high pressure 30.40
inches builds into the great lakes wednesday and thursday, exiting
to the east across new england on friday. 


lez061-169-181415-
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-
343 am edt mon may 18 2026

.today...south winds 5 to 15 knots becoming southwest. waves 1 to
2 feet. 
.tonight...southwest winds 5 to 10 knots. a slight chance of
showers and thunderstorms late in the evening. a chance of
showers with a slight chance of thunderstorms after midnight.
waves 1 to 2 feet. 
.tuesday...southwest winds 10 to 15 knots. waves 1 to 3 feet. 
.tuesday night...southwest winds 10 to 15 knots becoming west.
showers with thunderstorms likely in the evening, then showers
overnight. waves 2 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet. 
.thursday...northeast winds 10 to 15 knots becoming east. waves
2 feet or less. 
.friday...east winds 5 to 15 knots becoming southeast. a chance
of showers during the day, then showers likely friday night.
waves 2 feet or less. 

winds and waves higher in and near thunderstorms.

$$

fzus61 kcle 180743
glfle 
expires:202605181415;;756328

open lake forecast for lake erie
national weather service cleveland oh
343 am edt mon may 18 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...
southerly flow continues across the region through tuesday. low
pressure 29.70 inches tracks through the northern great lakes on
tuesday, pulling a cold front southeast across lake erie late
tuesday night and early wednesday morning. high pressure 30.40
inches builds into the great lakes wednesday and thursday, exiting
to the east across new england on friday. 


lez162>164-181415-
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-
343 am edt mon may 18 2026

.today...south winds 10 to 15 knots becoming southwest 15 to
20 knots. a slight chance of showers and thunderstorms late.
waves 1 to 3 feet. 
.tonight...southwest winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers and thunderstorms in the evening,
then a chance of showers with a slight chance of thunderstorms
after midnight. waves 1 to 3 feet. 
.tuesday...south winds 10 to 15 knots becoming southwest 15 to
20 knots. showers and thunderstorms likely in the afternoon.
waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming
northwest 10 to 15 knots. showers with thunderstorms likely in
the evening, then showers overnight. waves 2 to 4 feet subsiding
to 1 to 3 feet. 
.wednesday...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming east. waves
1 to 3 feet. 
.friday...east winds 15 to 20 knots becoming southeast 10 to
15 knots. a chance of showers during the day, then showers likely
friday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$

fzus63 kdtx 180715
glflh 
expires:202605181515;;755522

open lake forecast for lake huron
national weather service detroit/pontiac mi
315 am edt mon may 18 2026

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz361-181515-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
315 am edt mon may 18 2026

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


$$

fzus63 kdtx 180715
glflh 
expires:202605181515;;755523

open lake forecast for lake huron
national weather service detroit/pontiac mi
315 am edt mon may 18 2026

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz362-363-181515-
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-
315 am edt mon may 18 2026

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


$$

fzus63 kdtx 180715
glflh 
expires:202605181515;;755524

open lake forecast for lake huron
national weather service detroit/pontiac mi
315 am edt mon may 18 2026

for waters beyond five nautical miles off shore on lake huron

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

.synopsis...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lhz462>464-181515-
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-
315 am edt mon may 18 2026

.today...south winds 10 to 15 knots increasing to 15 to 20 knots
in the late morning and afternoon. waves 3 to 5 feet. 
.tonight...south winds 10 to 15 knots. showers likely and a
chance of thunderstorms in the evening...then a chance of showers
after midnight. waves 3 to 5 feet. 
.tuesday...south winds 15 to 20 knots. a chance of showers and
thunderstorms in the afternoon. waves 3 to 5 feet. 
.tuesday night...southwest winds 15 to 20 knots. a chance of
showers and thunderstorms in the evening. waves 4 to 6 feet.
waves occasionally around 8 feet. 
.wednesday...north winds 10 to 15 knots. waves 3 to 5 feet. 
.thursday...north winds 5 to 10 knots. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.friday...east winds 5 to 10 knots increasing to 10 to 15 knots .
waves 2 feet or less. 


$$

fzus63 kdtx 180714
glfsc 
expires:202605181515;;755506

lake st clair forecast
national weather service detroit/pontiac mi
314 am edt mon may 18 2026

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

.synopsis...a warm front lifts across lake huron this morning,
with southerly flow expanding across all of the local waters.
strong to severe thunderstorms are possible this afternoon-
evening and again tuesday as a cold front sweeps across the
region. high pressure, 30.50 inches, then builds in mid-week.


lcz460-181515-
lake st clair-
314 am edt mon may 18 2026

...small craft advisory in effect from 10 am edt this morning
through this evening...

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

$$

fzus63 kmkx 180821
glflm 
expires:202605181515;;758003

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
321 am cdt mon may 18 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 at this time. a warm front
will move from southern lake michigan to northern lake michigan 
throughout the night. east to northeast winds will become breezy 
out of the south. areas of dense fog may occur at times until the 
front passes. breezy south winds will then continue through monday
and into tuesday followed by a wind shift to the northwest late 
tuesday afternoon and evening with the passage of a cold front. 
high pressure and light and variable winds will then take hold 
from late wednesday into thursday.


lmz261-362-364-366-563-565-567-868-181515-
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-
321 am cdt mon may 18 2026

sheboygan wi to pentwater mi north...

.today...south winds to 30 kt diminishing to 15 to 25 kt. patchy
fog. chance of rain showers and thunderstorms. waves 4 to 7 ft
occasionally to 9 ft. 
.tonight...south winds 15 to 25 kt increasing to 30 kt. patchy
fog in the evening, then areas of fog overnight. chance of
showers and thunderstorms in the evening, then showers with a
chance of thunderstorms overnight. waves 4 to 7 ft occasionally
to 9 ft building to 5 to 8 ft occasionally to 10 ft. 
.tuesday...south winds to 30 kt veering to west. showers with a
chance of thunderstorms in the morning, then chance of showers
and thunderstorms in the afternoon. waves 7 to 10 ft occasionally
to 13 ft. 
.tuesday night...northwest winds 15 to 25 kt. waves 4 to 7 ft
occasionally to 9 ft subsiding to 3 to 5 ft. 
.wednesday...north winds 15 to 25 kt diminishing to 10 to 20 kt.
waves 2 to 4 ft. 
.wednesday night...northeast winds 10 to 20 kt diminishing to
5 to 10 kt. waves 1 to 3 ft. 
.thursday...east winds 5 to 10 kt becoming northeast 10 to 20 kt.
waves 1 to 2 ft. 
.friday...southeast winds 10 to 20 kt becoming east. waves 1 to
3 ft.  

$$

fzus63 kmkx 180821
glflm 
expires:202605181515;;758004

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
321 am cdt mon may 18 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 at this time. a warm front
will move from southern lake michigan to northern lake michigan 
throughout the night. east to northeast winds will become breezy 
out of the south. areas of dense fog may occur at times until the 
front passes. breezy south winds will then continue through monday
and into tuesday followed by a wind shift to the northwest late 
tuesday afternoon and evening with the passage of a cold front. 
high pressure and light and variable winds will then take hold 
from late wednesday into thursday.


lmz080-669-671-673-675-777-779-870-872-874-876-878-181515-
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-
321 am cdt mon may 18 2026

sheboygan wi to pentwater mi south...

.today...south winds to 30 kt diminishing to 15 to 25 kt. chance
of showers and thunderstorms. waves 4 to 7 ft occasionally to
9 ft. 
.tonight...south winds 10 to 20 kt increasing to 30 kt. chance of
showers and thunderstorms. waves 4 to 7 ft occasionally to 9 ft
building to 5 to 8 ft occasionally to 10 ft. 
.tuesday...south winds to 30 kt becoming west 15 to 25 kt.
showers likely with a chance of thunderstorms in the morning,
then chance of showers and thunderstorms in the afternoon. waves
6 to 9 ft occasionally to 12 ft. 
.tuesday night...northwest winds 10 to 20 kt becoming north.
chance of rain showers and thunderstorms in the evening. waves
4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. 
.wednesday...north winds 10 to 20 kt increasing to 15 to 25 kt.
waves 3 to 5 ft. 
.wednesday night...northeast winds 10 to 20 kt. waves 3 to 5 ft
subsiding to 2 to 4 ft. 
.thursday...east winds 10 to 20 kt becoming northeast. waves 2 to
4 ft. 
.friday...east winds 10 to 20 kt diminishing to 10 to 15 kt.
waves 2 to 4 ft.  

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756711

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
401 am edt mon may 18 2026

...dense fog advisory in effect until 5 pm edt this afternoon...

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

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756712

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
401 am edt mon may 18 2026

...dense fog advisory in effect until 5 pm edt this afternoon...

.early this morning...southeast winds 10 to 20 knots. patchy
dense fog. rain showers and a chance of thunderstorms. waves 3 to
6 feet occasionally to 8 feet. 
.today...southeast winds 10 to 20 knots veering west in the
afternoon, then veering north late. patchy dense fog. a chance of
showers. waves subsiding to calm to 2 feet. 
.tonight...north winds 10 to 20 knots veering east late. areas of
dense fog through midnight. patchy fog after midnight. a chance
of rain showers through midnight. a slight chance of
thunderstorms. rain showers after midnight. waves building to
2 to 4 feet. 
.tuesday...northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. patchy fog through early afternoon.
rain showers likely and a slight chance of thunderstorms through
early afternoon. waves building to 4 to 7 feet occasionally to
9 feet. 
.tuesday night...northwest winds 15 to 25 knots. waves subsiding
to 3 to 5 feet occasionally to 7 feet. 
.wednesday...northwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. waves subsiding to calm to 2 feet. 
.wednesday night...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet. 
.thursday...southeast winds 10 to 20 knots veering south. waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.friday...southeast winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756709

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt mon may 18 2026 /301 am cdt mon may 18 2026/

.early this morning...northeast winds 10 to 20 knots. patchy fog.
rain showers likely and a slight chance of thunderstorms. waves
3 to 6 feet occasionally to 8 feet. 
.today...northeast winds 5 to 15 knots. patchy fog. a slight
chance of rain showers. waves subsiding to 1 to 3 feet. 
.tonight...northeast winds 15 to 25 knots. patchy fog. a chance
of rain showers through midnight. a slight chance of
thunderstorms. rain showers after midnight. waves building to
4 to 7 feet occasionally to 9 feet. 
.tuesday...north winds 10 to 20 knots backing west in the
afternoon. a chance of rain showers through early afternoon.
waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...southwest winds 5 to 15 knots backing south by mid
afternoon. waves calm to 2 feet. 
.wednesday night...southeast winds 5 to 15 knots veering south
after midnight. waves calm to 2 feet. 
.thursday...east winds 5 to 15 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 
.friday...east winds 5 to 15 knots backing northeast. waves
building to 1 to 3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756714

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
401 am edt mon may 18 2026

...dense fog advisory in effect until 8 pm edt this evening...

.early this morning...southeast winds 20 to 30 knots. patchy fog.
rain showers likely and a chance of thunderstorms. waves 3 to
6 feet occasionally to 8 feet. 
.today...southeast winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then becoming north 5 to 15 knots
late. areas of dense fog. a slight chance of thunderstorms
through early afternoon. a chance of showers. waves subsiding to
calm to 2 feet. 
.tonight...east winds 5 to 15 knots becoming southeast 10 to
20 knots late. areas of dense fog. a chance of showers and
thunderstorms. waves building to 2 to 4 feet. 
.tuesday...south winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. areas of dense fog
through early afternoon. a slight chance of thunderstorms through
early afternoon. a chance of rain showers. waves building to 7 to
10 feet occasionally to 13 feet. 
.tuesday night...northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. waves subsiding to 2 to 4 feet. 
.wednesday night...west winds 5 to 15 knots backing south after
midnight. waves subsiding to calm to 2 feet. 
.thursday...east winds 5 to 15 knots veering southeast. waves
calm to 2 feet. 
.friday...southeast winds 10 to 20 knots. waves building to 1 to
3 feet, then subsiding to calm to 2 feet. 

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756713

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz266-182000-
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-
401 am edt mon may 18 2026

...dense fog advisory in effect until 5 pm edt this afternoon...

.early this morning...southeast winds 15 to 25 knots. areas of
dense fog. rain showers and a chance of thunderstorms. waves 3 to
6 feet occasionally to 8 feet. 
.today...south winds 10 to 20 knots veering southwest in the
afternoon, then veering north late. areas of dense fog. a slight
chance of thunderstorms through early afternoon. a chance of
showers. waves subsiding to 2 to 4 feet. 
.tonight...northeast winds 15 to 25 knots veering east after
midnight. areas of dense fog. a chance of rain showers through
midnight. a chance of thunderstorms. rain showers likely after
midnight. waves building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...south winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon, then increasing to 30 knots with a few
gale force gusts to 35 knots possible late. areas of dense fog
through early afternoon. a slight chance of thunderstorms through
early afternoon. a chance of rain showers. waves building to 7 to
10 feet occasionally to 13 feet. 
.tuesday night...northwest winds 20 to 30 knots. waves subsiding
to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 15 to 25 knots becoming west 5 to
15 knots by mid afternoon. waves subsiding to 1 to 3 feet. 
.wednesday night...southwest winds 5 to 15 knots backing south
after midnight. waves subsiding to calm to 2 feet. 
.thursday...south winds 10 to 20 knots. waves building to 2 to
4 feet, then subsiding to 1 to 3 feet. 
.friday...southeast winds 15 to 25 knots diminishing to 10 to
20 knots. waves 1 to 3 feet. 

$$

fzus63 kmqt 180802
glfls 
expires:202605182000;;756710

open lake forecast for lake superior
national weather service marquette mi
401 am edt mon may 18 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... 

low pressure will weaken over the lake today with another low 
pressure following it, reaching lake superior by tuesday morning at 
29.6 inches. afterwards, a 30.2 inch high over the northern plains 
builds to 30.4 inches tuesday night into wednesday as it traverses 
eastwards into the upper great lakes. the high pressure shifts east 
on thursday while leaving lingering ridging of at least 30.1 inches 
over lake superior into friday.



lsz263-182000-
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-
401 am edt mon may 18 2026

.early this morning...east winds 10 to 20 knots. patchy fog. rain
showers and a slight chance of thunderstorms. waves 3 to 5 feet
occasionally to 7 feet. 
.today...north winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then becoming northeast 10 to 20 knots late.
patchy fog. a slight chance of rain showers. waves subsiding to
1 to 3 feet. 
.tonight...northeast winds 15 to 25 knots. patchy fog. a chance
of rain showers through midnight. a slight chance of
thunderstorms. rain showers after midnight. waves building to
5 to 8 feet occasionally to 10 feet. 
.tuesday...north winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. a chance of rain showers through early
afternoon. waves subsiding to 2 to 4 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...northwest winds 5 to 15 knots backing southwest by
mid afternoon. waves building to 1 to 3 feet. 
.wednesday night...south winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.thursday...south winds 5 to 15 knots increasing to 10 to
20 knots. waves building to 1 to 3 feet. 
.friday...east winds 5 to 15 knots. waves subsiding to calm to
2 feet, then building to 1 to 3 feet. 

$$