Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

788
FZUS53 KDLH 152126
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
426 PM CDT Tue Apr 15 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>142-160415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
Taconite Harbor to Silver Bay Harbor MN-
426 PM CDT Tue Apr 15 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.TONIGHT...Northwest wind 15 to 20 knots with gusts to around
25 knots easing to 5 to 10 knots with gusts to around 20 knots
after midnight. Mostly clear. Waves 1 to 2 feet.
.WEDNESDAY...North wind 5 to 10 knots becoming southeast in the
late morning and afternoon. Sunny. Waves 1 foot or less.
.WEDNESDAY NIGHT...East wind 10 to 15 knots. Gusts up to 20 knots
in the late evening and overnight. Partly cloudy in the evening
then becoming mostly cloudy. Waves 1 to 3 feet.
.THURSDAY...East wind 10 to 15 knots. Gusts up to 25 knots
decreasing to 20 knots in the late morning and afternoon. Rain
likely in the afternoon. Waves 2 to 4 feet.

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

$$

LSZ143-160415-
Silver Bay Harbor to Two Harbors MN-
426 PM CDT Tue Apr 15 2025

.TONIGHT...North wind 5 to 10 knots with gusts to around 20 knots
until early morning becoming variable 10 knots or less. Mostly
clear. Waves 1 foot or less.
.WEDNESDAY...North wind 5 knots becoming east in the late morning
and early afternoon, then rising to 10 to 15 knots with gusts to
around 20 knots late in the afternoon. Sunny. Waves 1 to 2 feet.
.WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots in the evening then 20 knots early in the morning.
Partly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northeast wind 10 to 15 knots with gusts to around
20 knots. Slight chance of rain in the morning, then rain and
slight chance of thunderstorms in the afternoon. Waves 1 to
2 feet.

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

$$

LSZ144-145-160415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
426 PM CDT Tue Apr 15 2025

.TONIGHT...North wind 10 to 15 knots with gusts to around
20 knots easing to 5 knots after midnight. Mostly clear. Waves
1 to 2 feet.
.WEDNESDAY...East wind 5 to 10 knots becoming northeast 15 to
20 knots in the afternoon. Sunny. Waves 1 to 2 feet.
.WEDNESDAY NIGHT...Northeast wind 15 to 20 knots. Partly cloudy.
Waves 1 to 3 feet subsiding to 1 to 2 feet after midnight.
.THURSDAY...East wind 10 to 15 knots. Gusts up to 20 knots in the
afternoon. Slight chance of rain in the morning, then rain and
slight chance of thunderstorms in the afternoon. Waves 1 to
2 feet.

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

$$

LSZ146-160415-
Port Wing to Sand Island WI-
426 PM CDT Tue Apr 15 2025

.TONIGHT...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming north 5 knots after midnight. Mostly clear.
Waves 1 to 2 feet.
.WEDNESDAY...Northeast wind 10 to 15 knots. Sunny. Waves 1 to
2 feet.
.WEDNESDAY NIGHT...East wind 10 to 15 knots. Partly cloudy. Waves
1 to 2 feet.
.THURSDAY...East wind 5 to 10 knots. Slight chance of rain in the
morning, then rain and slight chance of thunderstorms in the
afternoon. Waves 1 to 2 feet.

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

$$

LSZ147-160415-
Sand Island to Bayfield WI-
426 PM CDT Tue Apr 15 2025

.TONIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots
early in the evening. Mostly clear. Waves 1 to 2 feet.
.WEDNESDAY...North wind 5 knots becoming east in the late morning
and afternoon. Sunny. Waves 1 foot or less.
.WEDNESDAY NIGHT...East wind 5 to 10 knots. Gusts up to 20 knots
early in the evening. Partly cloudy. Waves 1 foot or less.
.THURSDAY...East wind 5 to 10 knots. Gusts up to 20 knots early
in the morning. Slight chance of rain in the morning, then rain
and slight chance of thunderstorms in the afternoon. Waves 1 to
2 feet.

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

$$

LSZ150-160415-
Outer Apostle Islands Beyond 5 NM from Mainland-
426 PM CDT Tue Apr 15 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

.TONIGHT...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming north 5 knots late in the night. Mostly clear.
Waves 1 to 3 feet.
.WEDNESDAY...North wind 5 knots becoming southeast in the late
morning and early afternoon, then becoming east 10 to 15 knots
late in the afternoon. Sunny. Waves 1 foot or less.
.WEDNESDAY NIGHT...East wind 10 to 15 knots. Gusts up to 20 knots
in the evening. Mostly clear in the evening then becoming mostly
cloudy. Waves 1 to 2 feet.
.THURSDAY...East wind 10 to 15 knots with gusts to around
20 knots easing to 5 to 10 knots in the afternoon. Rain likely
and slight chance of thunderstorms in the afternoon. Waves 1 to
2 feet.

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

$$

LSZ121-160415-
Chequamegon Bay-Bayfield to Oak Point WI-
426 PM CDT Tue Apr 15 2025

.TONIGHT...Northwest wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.WEDNESDAY...West wind 5 knots becoming southeast late in the
morning, then becoming east in the afternoon. Sunny. Waves 1 foot
or less.
.WEDNESDAY NIGHT...East wind 5 to 10 knots becoming southeast
after midnight. Partly cloudy. Waves 1 foot or less.
.THURSDAY...Southeast wind 5 to 10 knots. Gusts up to 20 knots in
the late morning and afternoon. Rain and slight chance of
thunderstorms in the afternoon. Waves 1 foot or less.

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

$$

LSZ148-160415-
Oak Point to Saxon Harbor WI-
426 PM CDT Tue Apr 15 2025

.TONIGHT...Northwest wind 10 to 15 knots with gusts to around
20 knots easing to 5 knots after midnight. Mostly clear. Waves
1 to 2 feet.
.WEDNESDAY...Northwest wind 5 knots becoming southeast late in
the morning, then becoming east in the afternoon. Sunny. Waves
1 foot or less.
.WEDNESDAY NIGHT...East wind 10 to 15 knots becoming southeast
with gusts to around 20 knots after midnight. Partly cloudy.
Waves 1 to 2 feet.
.THURSDAY...Southeast wind 10 to 15 knots easing to 5 to 10 knots
in the afternoon. Gusts up to 20 knots. Rain and slight chance of
thunderstorms in the afternoon. Waves 1 to 2 feet.

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

$$

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

Wolfe

Open Waters Forecast

501
FZUS63 KMQT 152003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 PM EDT Tue Apr 15 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...This afternoon, Lake Superior is sandwiched between a
eastward departing 29.2 inch low pressure over Quebec and a 30.2
inch ridge extending over the eastern end of the Plains. This 30.2
inch ridging passes east over Lake Superior Wednesday into Wednesday
night while troughing develops over the Plains. The 30.2 inch
ridging continues east over the Lower Great Lakes Thursday into
Thursday night. Meanwhile, a 29.4 inch low over the Northern Plains
gradually lifts northeast over the Upper Great Lakes as it weakens
to 29.6 inches and a Colorado low pressure system develops and moves
out over the Central Plains around 29.5 inches. This second low
lifts over the southern end of the Great Lakes on Friday, weakening
from 29.5 inches to 29.8 inches by Saturday morning. High pressure
around 30.2 inches looks to pass over the Upper Great Lakes the
remainder of the weekend.

LSZ162-160415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Tue Apr 15 2025 /303 PM CDT Tue Apr 15 2025/

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering southeast in
the afternoon, then becoming east 10 to 20 knots late. Waves
building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. A slight chance of rain
showers through early afternoon, then rain showers likely and a
slight chance of thunderstorms by mid afternoon. Waves building
to 2 to 4 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing north after
midnight. Rain showers through midnight, then a chance of rain
showers after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 15 to 25 knots. A chance of rain
showers. Waves 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers. Waves building to 1 to 3 feet.

$$

LSZ263-160415-
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-
403 PM EDT Tue Apr 15 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers and a slight
chance of thunderstorms by mid afternoon. Waves building to 4 to
7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. Rain showers through midnight,
then a chance of rain showers after midnight. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of rain showers. Waves subsiding to 2 to
4 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves building to 2 to 4 feet.

$$

LSZ264-160415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Tue Apr 15 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 6 to
10 feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight, then increasing to 10 to 20 knots late. Waves
building to 2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots. A chance of rain
showers by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Rain showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots backing southeast. Waves
building to 2 to 4 feet.

$$

LSZ265-160415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Tue Apr 15 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots with a few
gale force gusts to 35 knots possible. Waves 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then veering north late. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots late. Waves calm to 2 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots becoming south
15 to 25 knots after midnight. Rain showers. Waves 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ266-160415-
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-
403 PM EDT Tue Apr 15 2025

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 45 knots. Waves 12 to
17 feet occasionally to 21 feet subsiding to 11 to 15 feet
occasionally to 19 feet.
.TONIGHT...Northwest gales to 40 knots becoming north gales to
35 knots after midnight, then diminishing to 20 to 30 knots late.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots backing south
after midnight, then becoming southeast 10 to 20 knots late.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South winds 15 to 25 knots veering northwest by mid
afternoon. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ267-160415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Tue Apr 15 2025

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. A slight
chance of snow showers. Waves 12 to 17 feet occasionally to 21
feet subsiding to 11 to 15 feet occasionally to 19 feet.
.TONIGHT...Northwest gales to 40 knots becoming north gales to
35 knots after midnight, then diminishing to 20 to 30 knots late.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight, then backing south late. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots. Rain showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 15 to 25 knots veering west by mid
afternoon. Rain showers likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots becoming southeast 15 to
25 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ261-160415-
MAFOR 1521/
Superior West 11730 11720 11820 12810 11100 12300. Waves 3 to 5
feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Wednesday.

Superior North Central 11750 11740 11840 12830 11820 11710 11700.
Waves 5 to 9 feet subsiding to 4 to 7 feet tonight. Waves 3 to 6
feet subsiding to 1 to 3 feet Wednesday.

Superior South Central...GALE WARNING IN EFFECT...12750 11740
11840 11830 11720 12710. Waves 9 to 13 feet subsiding to 6 to 9
feet tonight. Waves 5 to 8 feet subsiding to 1 to 3 feet
Wednesday.

Superior East...GALE WARNING IN EFFECT...12750 11850 12840 11830
11730 11720. Waves 10 to 15 feet subsiding to 7 to 11 feet
tonight. Waves 6 to 9 feet subsiding to 3 to 5 feet Wednesday.

$$

Jablonski

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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