Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

685
FZUS53 KDLH 210904
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
304 AM CST Tue Jan 21 2025

For waters within five 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.

LSZ140>142-211715-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
Taconite Harbor to Silver Bay Harbor MN-
304 AM CST Tue Jan 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THIS AFTERNOON
THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots with gusts to around 30 knots.
Chance of snow early in the morning, then chance of flurries in
the late morning and afternoon. Heavy freezing spray late in the
afternoon. Waves 1 to 3 feet building to 5 to 8 feet. Waves
occasionally to 10 feet.
.TONIGHT...Southwest wind up to 30 knots easing to 15 to 20 knots
early in the morning. Heavy freezing spray. Snow likely. Waves
7 to 10 feet. Waves occasionally to 14 feet.
.WEDNESDAY...West wind 15 to 20 knots with gusts to around
25 knots becoming northwest with gusts to around 25 knots in the
late morning and afternoon. Chance of snow in the morning, then
chance of flurries in the afternoon. Waves 5 to 8 feet subsiding
to 1 to 3 feet. Waves occasionally to 10 feet.
.WEDNESDAY NIGHT...North wind 15 to 20 knots. Gusts up to
30 knots decreasing to 25 knots early in the morning. Partly
cloudy. Waves 1 to 3 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ143>145-211715-
Silver Bay Harbor to Two Harbors MN-Two Harbors to Duluth MN-
Duluth MN to Port Wing WI-
304 AM CST Tue Jan 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...

.TODAY...Southwest wind 20 to 25 knots with gusts to around
30 knots. Chance of snow in the morning, then chance of flurries
in the afternoon. Waves 3 to 5 feet. Waves occasionally to
7 feet.
.TONIGHT...Southwest wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots early in the morning. Heavy freezing spray
in the evening. Chance of snow through the night. Waves 4 to
7 feet. Waves occasionally to 9 feet.
.WEDNESDAY...West wind 15 to 20 knots with gusts to around
25 knots becoming northwest with gusts to around 25 knots in the
afternoon. Chance of flurries in the morning. Waves 2 to 4 feet
subsiding to 1 to 3 feet in the afternoon.
.WEDNESDAY NIGHT...Northwest wind 15 to 20 knots. Gusts up to
25 knots decreasing to 20 knots after midnight. Mostly cloudy in
the evening then becoming partly cloudy. Waves 1 to 3 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ146-211715-
Port Wing to Sand Island WI-
304 AM CST Tue Jan 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 8 AM CST THIS
MORNING THROUGH THIS AFTERNOON...

.TODAY...Southwest wind 20 to 25 knots with gusts to around
30 knots. Snow likely early in the morning, then chance of snow
late in the morning. Chance of flurries early in the afternoon.
Heavy freezing spray in the late morning and early afternoon.
Waves 4 to 6 feet. Waves occasionally to 8 feet.
.TONIGHT...Southwest wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots early in the morning. Chance of flurries
in the evening, then chance of snow after midnight. Waves 3 to
5 feet.
.WEDNESDAY...Southwest wind 15 to 20 knots with gusts to around
25 knots becoming northwest with gusts to around 25 knots in the
afternoon. Slight chance of snow in the morning, then chance of
flurries in the afternoon. Waves 2 to 4 feet subsiding to 1 to
3 feet late in the afternoon.
.WEDNESDAY NIGHT...Northwest wind 15 to 20 knots with gusts to
around 25 knots becoming north 10 to 15 knots with gusts to
around 25 knots in the late evening and overnight. Slight chance
of snow in the evening. Waves 2 to 4 feet subsiding to 1 to
3 feet early in the morning.

Note...Wave height forecasts are for ice free areas.

$$

LSZ147-211715-
Sand Island to Bayfield WI-
304 AM CST Tue Jan 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 8 AM CST THIS
MORNING THROUGH THIS AFTERNOON...

.TODAY...Southwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 25 knots late in the afternoon. Snow early in the
morning, then chance of snow late in the morning. Chance of
flurries in the afternoon. Waves 4 to 6 feet. Waves occasionally
to 7 feet.
.TONIGHT...South wind 15 to 20 knots with gusts to around
25 knots. Chance of flurries in the evening, then chance of snow
after midnight. Waves 2 to 4 feet.
.WEDNESDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots becoming northwest with gusts to around 25 knots in the
afternoon. Slight chance of snow in the morning, then chance of
flurries in the afternoon. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...North wind 15 to 20 knots. Gusts up to
25 knots decreasing to 20 knots after midnight. Slight chance of
snow. Waves 2 to 4 feet. A small craft advisory may be needed.

Note...Wave height forecasts are for ice free areas.

$$

LSZ148-211715-
Oak Point to Saxon Harbor WI-
304 AM CST Tue Jan 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...

.TODAY...Southwest wind 15 to 20 knots with gusts to around
25 knots. Slight chance of snow early in the morning, then chance
of flurries late in the morning. Waves 1 to 3 feet.
.TONIGHT...South wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots early in the morning. Chance of snow
through the night. Waves 2 to 4 feet subsiding to 1 to 3 feet
early in the morning.
.WEDNESDAY...Southwest wind 15 to 20 knots with gusts to around
25 knots becoming west 10 to 15 knots with gusts to around
20 knots in the afternoon. Slight chance of snow. Waves 1 to
3 feet.
.WEDNESDAY NIGHT...Northwest wind 15 to 20 knots. Gusts up to
25 knots decreasing to 20 knots after midnight. Chance of snow in
the evening, then slight chance of snow after midnight. Waves
2 to 4 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ150-211715-
Outer Apostle Islands Beyond 5 NM from Mainland-
304 AM CST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH LATE TONIGHT...
...SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY AFTERNOON...

.TODAY...Southwest wind 20 to 25 knots with gusts to around
30 knots. Snow early in the morning, then snow likely late in the
morning. Chance of flurries in the afternoon. Heavy freezing
spray in the late morning and early afternoon. Waves 4 to 7 feet.
Waves occasionally to 9 feet.
.TONIGHT...Southwest wind 20 to 25 knots with gusts to around
30 knots. Heavy freezing spray through the night. Chance of
flurries in the evening. Chance of snow after midnight. Waves
4 to 7 feet. Waves occasionally to 9 feet.
.WEDNESDAY...Southwest wind 15 to 20 knots with gusts to around
30 knots becoming northwest 10 to 15 knots with gusts to around
25 knots in the afternoon. Chance of snow in the morning, then
chance of flurries in the afternoon. Waves 3 to 5 feet.
.WEDNESDAY NIGHT...North wind 15 to 20 knots with gusts to around
25 knots. Chance of snow in the evening, then slight chance of
snow after midnight. Waves 3 to 5 feet. A small craft advisory
may be needed.

Note...Wave height forecasts are for ice free areas.

$$

Graphical marine forecasts are available online at:
weather.gov/greatlakes

LE

Open Waters Forecast

351
FZUS63 KMQT 210912
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
412 AM EST Tue Jan 21 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...A 30.8 inch high over the Central Plains will
continue to extend ridging up to 30.5 inches over the west half of
Lake Superior through this morning as it meanders toward Kentucky
for late today. Meanwhile, a 30.3 inch trough will persist over
eastern Lake Superior and a 29.7 inch clipper low develops over
the Canadian Prairie. The low will weaken to around 30 inches by
Wednesday as it passes across Lake Superior. Weak troughing will
persist over the lake into Thursday morning before a 30.2 inch
ridge builds in from the west Thursday night into Friday. Then, a
29.3 inch low over Hudson Bay drags a 29.9 inch trough eastward
over the lake the rest of the weekend.

LSZ162-211715-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
412 AM EST Tue Jan 21 2025 /312 AM CST Tue Jan 21 2025/

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...West winds 15 to 25 knots. Scattered snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...West winds 20 to 30 knots becoming southwest to 30 knots
with a few gale force gusts to 35 knots possible by mid
afternoon. Heavy freezing spray. Scattered snow showers. Waves
building to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots late.
Heavy freezing spray. A chance of snow. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering northwest by
late morning, then veering north by mid afternoon. A chance of
snow showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots. A slight chance of
snow showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. Waves building to
2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-211715-
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-
412 AM EST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...West winds 20 to 30 knots. Heavy freezing
spray. Snow showers. Waves 4 to 8 feet occasionally to 10 feet.
.TODAY...West winds to 30 knots with a few gale force gusts to
35 knots possible backing southwest by mid afternoon. Heavy
freezing spray. Numerous snow showers in the morning. Scattered
snow showers in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots late.
Heavy freezing spray. A chance of snow in the evening. Snow
likely after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering north by mid
afternoon. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. Waves building to
2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots. A chance of snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 20 to 30 knots. Freezing spray. Waves
subsiding to 4 to 7 feet occasionally to 9 feet, then building to
6 to 9 feet occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-211715-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
412 AM EST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Numerous
snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots increasing to 30 knots with a
few gale force gusts to 35 knots possible. Snow showers. Heavy
freezing spray in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. Heavy freezing spray. A chance of snow in the evening.
Snow likely after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering north by mid
afternoon. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. Freezing spray. A
chance of snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots. Freezing spray. A
chance of snow showers. Waves building to 5 to 9 feet
occasionally to 11 feet.
.SATURDAY...West winds 20 to 30 knots veering northwest. A chance
of snow showers. Freezing spray. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-211715-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
412 AM EST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...West winds 20 to 30 knots. Heavy freezing
spray. Numerous snow showers. Waves 3 to 6 feet occasionally to
8 feet building to 4 to 7 feet occasionally to 9 feet.
.TODAY...West winds 20 to 30 knots backing southwest by mid
afternoon. Heavy freezing spray. Scattered snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 20 to 30 knots. A chance of snow after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then becoming west 10 to 20 knots by
mid afternoon. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SATURDAY...West winds 20 to 30 knots. A chance of snow showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-211715-
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-
412 AM EST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...West winds 20 to 30 knots. Heavy freezing
spray. Snow showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...West winds 20 to 30 knots becoming southwest to 30 knots
with a few gale force gusts to 35 knots possible by mid
afternoon. Heavy freezing spray. Numerous snow showers in the
morning. Scattered snow showers in the afternoon. Waves building
to 8 to 11 feet occasionally to 14 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. Heavy freezing spray. A chance of snow. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then veering west by mid afternoon.
Freezing spray in the morning. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots veering north after
midnight. A chance of snow showers. Freezing spray after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 20 to 30 knots veering northwest. A chance
of snow showers. Freezing spray. Waves building to 7 to 11 feet
occasionally to 14 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-211715-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
412 AM EST Tue Jan 21 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Freezing
spray. Snow showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...West winds 20 to 30 knots becoming southwest to 30 knots
with a few gale force gusts to 35 knots possible by mid
afternoon. Heavy freezing spray. Snow showers. Waves building to
5 to 9 feet occasionally to 11 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 20 to 30 knots by
midnight. Heavy freezing spray. A chance of snow. Waves 5 to
8 feet occasionally to 10 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Freezing spray in the morning. Snow
showers likely in the morning, then a chance of snow showers in
the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots veering north after
midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. A chance of snow showers. Waves 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming northwest
gales to 35 knots. A chance of snow showers. Freezing spray.
Waves building to 7 to 11 feet occasionally to 14 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-211715-
MAFOR 2110/
Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...12647
11652 19657 12552 19557 12552 11557. Waves 3 to 6 feet building to
6 to 9 feet today. Waves 5 to 9 feet tonight.

Superior North Central...HEAVY FREEZING SPRAY WARNING IN EFFECT...
12637 11647 11657 12557 11552 11540. Waves 3 to 6 feet building to
8 to 11 feet today. Waves 7 to 11 feet subsiding to 6 to 9 feet
tonight.

Superior South Central...HEAVY FREEZING SPRAY WARNING IN EFFECT...
11657 12642 19647 11542 11540 12530 11540. A chance of snow
overnight. Waves 5 to 8 feet today. Waves 3 to 6 feet tonight.

Superior East...HEAVY FREEZING SPRAY WARNING IN EFFECT...11737
11637 12647 11547 13542. Waves 6 to 9 feet.

$$

Voss

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes

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