502
FZUS53 KDLH 050750
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
250 AM CDT Fri Sep 5 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.

LSZ140-141-051615-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and afternoon. Slight
chance of rain showers early in the morning, then chance of rain
showers late in the morning. Slight chance of rain showers in the
afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the late
morning and afternoon.
.TONIGHT...Northwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 25 knots after midnight. Slight chance of rain
showers in the evening. Waves 2 to 4 feet subsiding to 1 to
3 feet after midnight.
.SATURDAY...West wind 10 to 15 knots with gusts to around
20 knots. Partly sunny. Waves 1 to 2 feet.
.SATURDAY NIGHT...Northwest wind 10 to 15 knots with gusts to
around 20 knots. Mostly cloudy in the evening then becoming
partly cloudy. Waves 1 foot or less.

$$

LSZ142-143-051615-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 15 to 20 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and afternoon. Slight
chance of rain showers early in the morning, then chance of rain
showers late in the morning. Slight chance of rain showers in the
afternoon. Waves 1 to 2 feet building to 1 to 3 feet in the late
morning and afternoon.
.TONIGHT...Northwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots. Slight chance of rain showers in the
evening. Waves 1 to 2 feet.
.SATURDAY...West wind 5 to 10 knots. Gusts up to 20 knots early
in the morning. Slight chance of rain showers in the afternoon.
Waves 1 foot or less.
.SATURDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in
the evening then becoming partly cloudy. Waves 1 foot or less.

$$

LSZ144-145-051615-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and afternoon. Slight
chance of rain showers early in the morning, then chance of
sprinkles late in the morning. Slight chance of rain showers in
the afternoon. Waves 3 to 5 feet. Waves occasionally to 7 feet.
.TONIGHT...Northwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots. Slight chance of rain showers in the
evening. Waves 3 to 5 feet subsiding to 1 to 2 feet early in the
morning.
.SATURDAY...West wind 5 to 10 knots. Partly sunny. Waves 1 to
2 feet.
.SATURDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in
the evening then clearing. Waves 1 to 2 feet.

$$

LSZ146-051615-
Port Wing to Sand Island WI-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots with gusts to around 30 knots.
Slight chance of rain showers early in the morning, then chance
of rain showers late in the morning. Slight chance of rain
showers in the afternoon. Waves 4 to 6 feet. Waves occasionally
to 8 feet.
.TONIGHT...West wind 20 to 25 knots with gusts to around 30 knots
becoming northwest 10 to 15 knots with gusts to around 25 knots
after midnight. Slight chance of rain showers in the evening.
Waves 4 to 6 feet subsiding to 1 to 3 feet. Waves occasionally to
7 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots early
in the morning. Partly sunny. Waves 1 to 2 feet.
.SATURDAY NIGHT...Northwest wind 10 to 15 knots. Gusts up to
20 knots late in the evening. Mostly cloudy in the evening then
becoming partly cloudy. Waves 1 to 2 feet.

$$

LSZ147-051615-
Sand Island to Bayfield WI-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots with gusts to around 30 knots.
Chance of rain showers in the morning, then slight chance of rain
showers in the afternoon. Waves 4 to 6 feet. Waves occasionally
to 8 feet.
.TONIGHT...Northwest wind 20 to 25 knots with gusts to around
30 knots easing to 10 to 15 knots with gusts to around 20 knots
early in the morning. Slight chance of rain showers in the
evening. Waves 4 to 6 feet subsiding to 1 to 3 feet early in the
morning. Waves occasionally to 7 feet.
.SATURDAY...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming west 5 to 10 knots in the afternoon. Partly
sunny. Waves 1 to 3 feet.
.SATURDAY NIGHT...Northwest wind 10 to 15 knots. Gusts up to
20 knots early in the morning. Mostly cloudy in the evening then
becoming partly cloudy. Waves 1 to 2 feet.

$$

LSZ150-051615-
Outer Apostle Islands Beyond 5 NM from Mainland-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots with gusts to around 30 knots.
Chance of rain showers in the morning, then slight chance of rain
showers in the afternoon. Waves 5 to 7 feet. Waves occasionally
to 10 feet.
.TONIGHT...Northwest wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots after midnight. Slight chance of rain
showers in the evening. Waves 4 to 7 feet subsiding to 3 to
5 feet early in the morning. Waves occasionally to 9 feet.
.SATURDAY...West wind 10 to 15 knots with gusts to around
20 knots. Partly sunny. Waves 2 to 4 feet subsiding to 1 to
3 feet in the late morning and afternoon.
.SATURDAY NIGHT...Northwest wind 10 to 15 knots with gusts to
around 20 knots. Mostly cloudy in the evening then becoming
partly cloudy. Waves 1 to 3 feet.

$$

LSZ121-051615-
Chequamegon Bay-Bayfield to Oak Point WI-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 15 to 20 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and afternoon. Chance
of rain showers in the morning, then slight chance of rain
showers early in the afternoon. Chance of rain showers late in
the afternoon. Waves 1 to 2 feet.
.TONIGHT...West wind 15 to 20 knots with gusts to around 30 knots
becoming northwest 5 to 10 knots with gusts to around 20 knots
early in the morning. Slight chance of rain showers in the
evening. Waves 1 to 2 feet.
.SATURDAY...West wind 5 to 10 knots. Partly sunny. Waves 1 foot
or less.
.SATURDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in
the evening then becoming partly cloudy. Waves 1 foot or less.

$$

LSZ148-051615-
Oak Point to Saxon Harbor WI-
250 AM CDT Fri Sep 5 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TODAY...West wind 20 to 25 knots. Gusts up to 25 knots
increasing to 30 knots in the late morning and afternoon. Chance
of rain showers. Waves 3 to 5 feet.
.TONIGHT...Northwest wind 20 to 25 knots with gusts to around
30 knots easing to 10 to 15 knots with gusts to around 20 knots
early in the morning. Slight chance of rain showers in the
evening. Waves 3 to 5 feet subsiding to 1 to 3 feet early in the
morning.
.SATURDAY...Northwest wind 10 to 15 knots becoming west 5 to
10 knots in the late morning and afternoon. Partly sunny. Waves
1 to 2 feet.
.SATURDAY NIGHT...Northwest wind 10 to 15 knots. Mostly cloudy in
the evening then becoming partly cloudy. Waves 1 to 2 feet.

$$

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

Rothstein