fzus63 kdtx 181354
glflh 
expires:202510182200;;343093

open lake forecast for lake huron
national weather service detroit/pontiac mi
954 am edt sat oct 18 2025

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, 29.20 inches, rapidly develops along a
cold front over the mid-mississippi and moves over lower michigan
sunday, bringing the chance for southerly gales sunday morning
across central and southern lake huron with higher probabilities
for northwesterly gales over most of lake huron by late sunday
afternoon. elsewhere, near gale gusts can be expected. high
pressure builds in briefly on monday before another low pressure
moves through the region on tuesday bringing another chance at
gales.


lhz361-182200-
lake huron from 5nm east of mackinac bridge to presque isle lt
beyond 5 nm off shore-
954 am edt sat oct 18 2025

...gale warning in effect from sunday afternoon through late
sunday night...

.rest of today...south winds 10 to 15 knots decreasing to 5 to
10 knots in the afternoon. showers likely and a chance of
thunderstorms late in the morning...then a chance of showers in
the afternoon. waves 3 to 5 feet. 
.tonight...light and variable winds. showers after midnight.
waves 1 to 3 feet. 
.sunday...northeast winds 5 to 10 knots becoming north 15 to
20 knots with gusts to around 30 knots in the late morning and
early afternoon...then becoming northwest to 30 knots with gusts
to 40 knot gales early in the afternoon. showers. waves 1 to 3 
feet building to 10 to 14 feet. waves occasionally around 18 feet.
.sunday night...northwest winds to 30 knots with gusts to 40 knot
gales decreasing to 20 to 25 knots with gusts to around 30 knots 
after midnight. showers in the evening. waves 10 to 14 feet. waves
occasionally around 18 feet. 
.monday...northwest winds 15 to 20 knots becoming west 10 to
15 knots late in the morning...then backing to the south late in
the afternoon becoming southeast 15 to 20 knots late in the
evening. a chance of showers late in the afternoon. rain showers
late in the evening. waves 6 to 9 feet subsiding to 3 to 5 feet
late in the morning...then subsiding to 1 to 3 feet late in the
afternoon building to 3 to 5 feet late in the evening. waves
occasionally around 12 feet. 
.tuesday...south winds 15 to 20 knots increasing to 20 to
25 knots with gusts to 35 knot gales in the late morning and
early afternoon...then veering to the west with gusts to 40 knot
gales until early morning. showers. waves 6 to 9 feet. waves
occasionally around 12 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to 35 knot
gales decreasing to 15 to 20 knots in the late evening and early
morning. showers likely...then a chance of showers in the late
evening and early morning. waves 5 to 7 feet. waves occasionally
around 10 feet. 


$$

fzus63 kdtx 181354
glflh 
expires:202510182200;;343094

open lake forecast for lake huron
national weather service detroit/pontiac mi
954 am edt sat oct 18 2025

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, 29.20 inches, rapidly develops along a
cold front over the mid-mississippi and moves over lower michigan
sunday, bringing the chance for southerly gales sunday morning
across central and southern lake huron with higher probabilities
for northwesterly gales over most of lake huron by late sunday
afternoon. elsewhere, near gale gusts can be expected. high
pressure builds in briefly on monday before another low pressure
moves through the region on tuesday bringing another chance at
gales.


lhz362-182200-
lake huron from presque isle light to sturgeon point mi beyond
5nm off shore-
954 am edt sat oct 18 2025

...gale warning in effect from sunday afternoon through late
sunday night...

.rest of today...south winds 15 to 20 knots decreasing to 10 to
15 knots late in the afternoon. a chance of showers late in the
morning...then showers likely in the afternoon. waves 5 to
7 feet. waves occasionally around 10 feet. 
.tonight...south winds 5 to 10 knots in the evening becoming
light and variable...then becoming southeast 5 to 10 knots early
in the morning. showers likely in the evening...then showers
after midnight. waves 3 to 5 feet subsiding to 1 to 3 feet after
midnight. 
.sunday...southeast winds 15 to 20 knots becoming south at
35 knot gales with gusts to 40 knot gales. showers. waves 6 to
9 feet building to 12 to 16 feet in the late morning and
afternoon. waves occasionally around 20 feet.
.sunday night...northwest at 35 knot gales decreasing to 30 knots
in the late evening and overnight. gusts to 40 knot gales early.
showers in the evening. waves 12 to 16 feet. waves occasionally
around 20 feet. 
.monday...northwest winds 20 to 25 knots with gusts to around
30 knots becoming west 10 to 15 knots late in the morning...then
backing to the southwest late in the afternoon becoming south
15 to 20 knots late in the evening. a chance of showers late in
the afternoon. rain showers late in the evening. waves 10 to
14 feet subsiding to 6 to 9 feet late in the morning...then
subsiding to 2 to 4 feet late in the afternoon building to 5 to
7 feet late in the evening. waves occasionally around 18 feet
early.
.tuesday...south winds 20 to 25 knots with gusts to 35 knot gales
becoming west to 30 knots with gusts to 35 knot gales early in
the evening...then decreasing to 20 to 25 knots with gusts to
around 30 knots in the late evening and early morning. showers.
waves 8 to 12 feet. waves occasionally around 15 feet. 
.wednesday...northwest winds 20 to 25 knots with gusts to around
30 knots decreasing to 15 to 20 knots in the late evening and
early morning. showers likely...then a chance of showers in the
late evening and early morning. waves 8 to 12 feet. waves
occasionally around 15 feet. 


$$

fzus63 kdtx 181354
glflh 
expires:202510182200;;343095

open lake forecast for lake huron
national weather service detroit/pontiac mi
954 am edt sat oct 18 2025

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, 29.20 inches, rapidly develops along a
cold front over the mid-mississippi and moves over lower michigan
sunday, bringing the chance for southerly gales sunday morning
across central and southern lake huron with higher probabilities
for northwesterly gales over most of lake huron by late sunday
afternoon. elsewhere, near gale gusts can be expected. high
pressure builds in briefly on monday before another low pressure
moves through the region on tuesday bringing another chance at
gales.


lhz363-462-463-182200-
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-
954 am edt sat oct 18 2025

...gale warning in effect from sunday morning through late sunday
night...

.rest of today...south winds 15 to 20 knots decreasing to 10 to
15 knots late in the afternoon. a chance of showers late in the
morning...then showers likely in the afternoon. waves 4 to 6 
feet. waves occasionally around 8 feet. 
.tonight...south winds 10 to 15 knots decreasing to 5 to 10 knots
in the late evening and early morning...then increasing to 10 to
15 knots early in the morning. showers likely and a chance of
thunderstorms in the evening...then showers after midnight. waves
3 to 5 feet subsiding to 1 to 3 feet after midnight...then
building to 3 to 5 feet early in the morning. 
.sunday...southeast winds 20 to 25 knots becoming south to
30 knots in the late morning and afternoon. gusts to 35 knot
gales. showers. waves 8 to 12 feet building to 12 to 16 feet in
the late morning and afternoon. waves occasionally around
18 feet. 
.sunday night...west winds to 30 knots with gusts to 40 knot
gales veering to the northwest with gusts to 35 knot gales in the
late evening and overnight. showers in the evening...then a
chance of showers after midnight. waves 12 to 16 feet. waves
occasionally around 20 feet. 
.monday...northwest winds 20 to 25 knots with gusts to around
30 knots becoming west 15 to 20 knots late in the morning...then
becoming southwest 10 to 15 knots late in the afternoon becoming
south 20 to 25 knots late in the evening. a chance of showers...
then showers late in the evening. waves 10 to 14 feet subsiding
to 4 to 6 feet. waves occasionally around 18 feet. 
.tuesday...south winds 20 to 25 knots becoming southwest to
30 knots. gusts to 35 knot gales. showers. waves 8 to 12 feet.
waves occasionally around 15 feet. 
.wednesday...west winds to 30 knots with gusts to 35 knot gales
becoming northwest 20 to 25 knots with gusts to 35 knot gales
until early morning. showers likely...then a chance of showers in
the late evening and early morning. waves 8 to 12 feet. waves
occasionally around 15 feet. 


$$

fzus63 kmkx 181350
glflm 
expires:202510182130;;342983

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
850 am cdt sat oct 18 2025

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...

modest southerly winds are expected today through the early
evening hours. low pressure is expected to move in from the great
plains across il and northern in tonight, and rapidly deepen to 
around 29.2 inches as it lifts into the lower michigan sunday 
morning, reaching lake huron by mid day sunday. this will drag a 
strong cold front across the lake, resulting in northwest gales 
sunday morning into sunday evening. winds briefly weaken for 
monday, but additional gales will be possible on tuesday as 
another deepening low pressure moves through the region.


lmz261-362-364-366-563-565-567-868-182130-
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-
850 am cdt sat oct 18 2025

sheboygan wi to pentwater mi north...

...gale warning in effect from sunday morning through sunday
evening...

.rest of today...southwest winds 15 to 25 kt diminishing to 10 to
20 kt. scattered showers with isolated thunderstorms through mid
morning. waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft. 
.tonight...south winds 10 to 15 kt backing to north 15 to 25 kt
late. showers and slight chance of thunderstorms overnight. waves
3 to 5 ft. 
.sunday...north gales to 35 kt becoming northwest gales to 40 kt.
showers likely in the morning, then chance of showers in the
afternoon. waves 6 to 9 ft occasionally to 12 ft building to
10 to 14 ft occasionally to 18 ft. 
.sunday night...northwest gales to 35 kt diminishing to 30 kt.
chance of showers in the evening. waves 8 to 11 ft occasionally
to 14 ft subsiding to 5 to 8 ft occasionally to 10 ft. 
.monday...west winds 10 to 20 kt becoming south to 30 kt in the
afternoon. waves 2 to 4 ft building to 8 to 11 ft occasionally to
14 ft. 
.monday night...south winds to 30 kt becoming southwest. showers.
waves 8 to 12 ft occasionally to 16 ft. 
.tuesday...west winds to 30 kt increasing to gales to 40 kt.
showers likely. waves 8 to 11 ft occasionally to 14 ft building
to 10 to 14 ft occasionally to 18 ft. 
.wednesday...northwest winds to 30 kt. chance of rain showers.
waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft
occasionally to 9 ft.  

$$

fzus63 kmkx 181350
glflm 
expires:202510182130;;342984

open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
850 am cdt sat oct 18 2025

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...

modest southerly winds are expected today through the early
evening hours. low pressure is expected to move in from the great
plains across il and northern in tonight, and rapidly deepen to 
around 29.2 inches as it lifts into the lower michigan sunday 
morning, reaching lake huron by mid day sunday. this will drag a 
strong cold front across the lake, resulting in northwest gales 
sunday morning into sunday evening. winds briefly weaken for 
monday, but additional gales will be possible on tuesday as 
another deepening low pressure moves through the region.


lmz080-669-671-673-675-777-779-870-872-874-876-878-182130-
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-
850 am cdt sat oct 18 2025

sheboygan wi to pentwater mi south...

...gale warning in effect from sunday morning through sunday
evening...

.rest of today...southwest winds 15 to 25 kt becoming south 10 to
20 kt. scattered showers and thunderstorms through mid morning,
then chance of showers and thunderstorms this afternoon. waves
4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft. 
.tonight...south winds 10 to 15 kt veering to northwest 15 to
25 kt late. patchy fog. chance of showers and slight chance of
thunderstorms in the evening, then showers and slight chance of
thunderstorms overnight. waves 2 to 4 ft building to 3 to 5 ft. 
.sunday...northwest gales to 35 kt increasing to gales to 40 kt.
showers in the morning, then chance of showers in the afternoon.
waves 8 to 11 ft occasionally to 14 ft building to 14 to 18 ft
occasionally to 23 ft. 
.sunday night...northwest gales to 35 kt diminishing to 30 kt.
waves 14 to 18 ft occasionally to 23 ft subsiding to 8 to 12 ft
occasionally to 16 ft. 
.monday...southwest winds 15 to 25 kt becoming south to 30 kt.
waves 4 to 7 ft occasionally to 9 ft building to 8 to 11 ft
occasionally to 14 ft. 
.monday night...south winds to 30 kt becoming west. showers
likely. waves 8 to 12 ft occasionally to 16 ft. 
.tuesday...west gales to 35 kt increasing to gales to 40 kt.
chance of showers. waves 12 to 16 ft occasionally to 21 ft. 
.wednesday...northwest winds to 30 kt. waves 10 to 14 ft
occasionally to 18 ft subsiding to 7 to 10 ft occasionally to
13 ft.  

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343399

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



lsz162-182000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt sat oct 18 2025 /901 am cdt sat oct 18 2025/

.rest of today...west winds 10 to 20 knots. waves calm to 2 feet.
.tonight...west winds 10 to 20 knots becoming northwest 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
a slight chance of showers through midnight. waves calm to
2 feet. 
.sunday...northwest winds 15 to 25 knots. waves building to 2 to
4 feet. 
.sunday night...northwest winds 5 to 15 knots backing west after
midnight. waves subsiding to calm to 2 feet. 
.monday...southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. a chance of showers through early
afternoon, then showers likely by mid afternoon. waves building
to 1 to 3 feet. 
.monday night...south winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. showers likely. waves building to
3 to 5 feet occasionally to 7 feet. 
.tuesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. rain showers likely, then a chance of rain showers.
waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 1 to 3 feet. 
.wednesday...west winds 10 to 20 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343400

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



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-
1001 am edt sat oct 18 2025

.rest of today...southwest winds 5 to 15 knots veering west in
the afternoon. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. a chance of showers. waves building to
1 to 3 feet. 
.sunday...northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. waves building to 3 to 5 feet
occasionally to 7 feet. 
.sunday night...northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots backing southeast by mid
afternoon. a chance of showers. waves building to 1 to 3 feet. 
.monday night...south winds 15 to 25 knots becoming west 20 to
30 knots after midnight. showers likely. waves building to 4 to
7 feet occasionally to 9 feet. 
.tuesday...north gales to 40 knots becoming northwest gales to
35 knots. rain showers likely, then a chance of rain showers.
waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet. 
.wednesday...northwest winds 15 to 25 knots becoming west 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343401

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



lsz264-182000-
lake superior from upper entrance to portage canal to manitou
island mi 5nm off shore to the us/canadian border-
1001 am edt sat oct 18 2025

.rest of today...southwest winds 5 to 15 knots veering west in
the afternoon. waves 1 to 3 feet subsiding to calm to 2 feet. 
.tonight...west winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. a slight chance of showers after
midnight. waves building to 2 to 4 feet. 
.sunday...northwest winds 15 to 25 knots. a slight chance of
showers through early afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.monday...south winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves building to 2 to 4 feet. 
.monday night...southeast winds 15 to 25 knots becoming east
20 to 30 knots after midnight. showers. waves building to 4 to
7 feet occasionally to 9 feet. 
.tuesday...north gales to 40 knots. rain showers, then a chance
of rain showers. waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 4 to 7 feet occasionally to 9 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. a chance of rain showers. waves subsiding to calm to
2 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343402

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



lsz265-182000-
lake superior west of line from manitou island to marquette mi
beyond 5nm from shore-
1001 am edt sat oct 18 2025

.rest of today...southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon, then becoming northwest 10 to
20 knots late. waves calm to 2 feet. 
.tonight...northwest winds 10 to 20 knots increasing to 15 to
25 knots after midnight. a chance of showers after midnight.
waves building to 3 to 5 feet occasionally to 7 feet. 
.sunday...northwest winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible in the
afternoon. a chance of showers. waves building to 4 to 8 feet
occasionally to 10 feet. 
.sunday night...northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. waves subsiding to 1 to 3 feet. 
.monday...south winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves subsiding to calm to 2 feet. 
.monday night...southeast winds 15 to 25 knots becoming west
20 to 30 knots after midnight. showers. waves building to 3 to
5 feet occasionally to 7 feet. 
.tuesday...northwest gales to 35 knots veering north. showers,
then a chance of showers. waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 10 to
20 knots. a chance of showers. waves subsiding to calm to 2 feet.

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343403

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



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-
1001 am edt sat oct 18 2025

...gale watch in effect from sunday morning through sunday
evening...

.rest of today...southwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then veering north late. waves
1 to 3 feet subsiding to calm to 2 feet. 
.tonight...northwest winds 5 to 15 knots becoming north 15 to
25 knots late. a chance of showers after midnight. waves building
to 3 to 5 feet occasionally to 7 feet. 
.sunday...north winds 20 to 30 knots becoming northwest gales to
35 knots in the afternoon. a chance of showers. waves building to
7 to 10 feet occasionally to 13 feet. 
.sunday night...northwest winds 20 to 30 knots diminishing to
10 to 20 knots after midnight. a slight chance of showers through
midnight. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...south winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.monday night...southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. showers. waves building to 4 to
7 feet occasionally to 9 feet. 
.tuesday...north gales to 35 knots. showers. waves building to
6 to 10 feet occasionally to 13 feet. 
.wednesday...northwest winds 15 to 25 knots diminishing to 10 to
20 knots. showers likely, then a chance of showers. waves
subsiding to 2 to 4 feet. 

$$

fzus63 kmqt 181401
glfls 
expires:202510182000;;343404

open lake forecast for lake superior
national weather service marquette mi
1001 am edt sat oct 18 2025

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...

29.1 inch low pressure over far northern ontario was moving onto the 
hudson bay this morning. as a result, 29.5 inch troughing remains 
over lake superior until this afternoon, leaving 29.6 inch troughing 
over the lake until this evening. a 29.6 inch shortwave low develops 
over the mid mississippi valley this evening then deepens to at 
least 29.3 inches on sunday as it crosses lower michigan. this low 
reaches james bay sunday night while a weak 29.8 inch ridge briefly 
extends over lake superior. another low pressure at 29.5 inches 
develops upstream over the northern plains, tracking east over the 
region monday night before coalescing into a compact 29.4 inch low 
over the upper great lakes tuesday morning. this low elongates from 
the great lakes to james bay tuesday night as it weakens to 29.5 
inches, eventually extending from the eastern great lakes to james 
bay by wednesday evening as it moves eastward.



lsz267-182000-
lake superior from grand marais mi to whitefish point mi 5nm off
shore to the us/canadian border-
1001 am edt sat oct 18 2025

...gale watch in effect from sunday morning through sunday
evening...

.rest of today...southwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then backing northeast late.
waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots backing north after midnight,
then increasing to 10 to 20 knots late. a chance of showers after
midnight. waves building to 1 to 3 feet. 
.sunday...north winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then backing northwest late. showers.
waves building to 7 to 10 feet occasionally to 13 feet. 
.sunday night...northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. a chance of showers through midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...west winds 10 to 20 knots becoming southeast 15 to
25 knots by mid afternoon. a chance of showers by mid afternoon.
waves subsiding to 1 to 3 feet. 
.monday night...southeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. showers. waves building to 3 to
6 feet occasionally to 8 feet. 
.tuesday...northwest winds 20 to 30 knots veering north. showers.
waves building to 5 to 8 feet occasionally to 10 feet. 
.wednesday...northwest winds 20 to 30 knots diminishing to 15 to
25 knots. showers likely. waves subsiding to 2 to 4 feet. 

$$