616
FZUS53 KDLH 172015
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
315 PM CDT Sun Aug 17 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.

LSZ140-141-180415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
315 PM CDT Sun Aug 17 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY MORNING...

.TONIGHT...East wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 25 knots late in the night. Slight chance of rain
showers after midnight. Chance of rain showers and slight chance
of thunderstorms late in the night. Waves 4 to 6 feet. Waves
occasionally to 8 feet.
.MONDAY...East wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots in the afternoon. Patchy fog through the
day. Slight chance of thunderstorms in the morning. Rain showers
likely through the day. Chance of thunderstorms in the afternoon.
Waves 3 to 5 feet.
.MONDAY NIGHT...Northeast wind 10 to 15 knots becoming north
after midnight. Gusts up to 20 knots. Chance of showers and
thunderstorms in the evening. Waves 2 to 4 feet subsiding to 1 to
3 feet early in the morning.
.TUESDAY...North wind 10 to 15 knots with gusts to around
20 knots becoming northeast 5 to 10 knots late in the afternoon.
Partly sunny. Waves 1 to 2 feet.

$$

LSZ142-143-180415-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
315 PM CDT Sun Aug 17 2025

...GALE WARNING IN EFFECT UNTIL 10 PM CDT THIS EVENING...

.TONIGHT...Northeast wind 20 to 25 knots with gales to around
35 knots becoming east 10 to 15 knots with gusts to around
20 knots late in the night. Slight chance of rain showers in the
evening, then rain showers and slight chance of thunderstorms
after midnight. Patchy fog after midnight. Waves 4 to 7 feet.
Waves occasionally to 10 feet.
.MONDAY...East wind 10 to 15 knots. Gusts up to 20 knots in the
morning. Patchy fog in the morning. Rain showers likely in the
morning. Chance of thunderstorms through the day. Chance of rain
showers in the afternoon. Waves 3 to 5 feet. A small craft
advisory may be needed.
.MONDAY NIGHT...Northeast wind 5 to 10 knots becoming north after
midnight. Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...North wind 5 to 10 knots becoming east late in the
afternoon. Mostly sunny. Waves 1 to 2 feet.

$$

LSZ144-145-180415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
315 PM CDT Sun Aug 17 2025

...GALE WARNING IN EFFECT UNTIL 10 PM CDT THIS EVENING...

.TONIGHT...Northeast wind 20 to 25 knots with gales to around
35 knots becoming east 10 to 15 knots with gusts to around
20 knots late in the night. Chance of rain showers and slight
chance of thunderstorms late in the evening. Rain showers likely
and chance of thunderstorms after midnight. Patchy fog after
midnight. Waves 4 to 7 feet subsiding to 3 to 5 feet late in the
night. Waves occasionally to 10 feet.
.MONDAY...East wind 10 to 15 knots. Gusts up to 20 knots early in
the morning. Showers likely and chance of thunderstorms in the
morning, then chance of showers and slight chance of
thunderstorms in the afternoon. Waves 2 to 4 feet subsiding to
1 to 3 feet in the late morning and afternoon.
.MONDAY NIGHT...North wind 5 to 10 knots. Mostly cloudy. Waves
1 foot or less.
.TUESDAY...North wind 5 to 10 knots becoming northeast in the
afternoon. Partly sunny. Waves 1 foot or less.

$$

LSZ146-180415-
Port Wing to Sand Island WI-
315 PM CDT Sun Aug 17 2025

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

.TONIGHT...East wind 15 to 20 knots with gusts to around 30 knots
easing to 5 to 10 knots with gusts to around 20 knots late in the
night. Slight chance of showers and thunderstorms in the evening,
then showers and chance of thunderstorms after midnight. Patchy
fog after midnight. Waves 4 to 7 feet subsiding to 2 to 4 feet
late in the night. Waves occasionally to 9 feet.
.MONDAY...East wind 5 to 10 knots becoming northeast late in the
afternoon. Patchy fog in the morning. Showers likely in the
morning. Chance of thunderstorms through the day. Chance of
showers in the afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...North wind 5 to 10 knots. Slight chance of
showers and thunderstorms in the evening. Waves 1 foot or less.
.TUESDAY...North wind 5 to 10 knots becoming northeast in the
afternoon. Mostly cloudy in the morning then becoming mostly
sunny. Waves 1 foot or less.

$$

LSZ147-180415-
Sand Island to Bayfield WI-
315 PM CDT Sun Aug 17 2025

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

.TONIGHT...East wind 15 to 20 knots with gusts to around 30 knots
becoming southeast 10 knots late in the night. Slight chance of
showers late in the evening. Chance of showers and slight chance
of thunderstorms after midnight, then showers likely and chance
of thunderstorms late in the night. Waves 4 to 6 feet subsiding
to 2 to 4 feet late in the night. Waves occasionally to 8 feet.
.MONDAY...East wind 5 to 10 knots. Patchy fog in the morning.
Showers in the morning. Chance of thunderstorms through the day.
Chance of showers in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...North wind 5 to 10 knots. Chance of thunderstorms
and slight chance of showers in the evening. Waves 1 foot or
less.
.TUESDAY...North wind 5 to 10 knots becoming northeast late in
the afternoon. Partly sunny. Waves 1 foot or less.

$$

LSZ150-180415-
Outer Apostle Islands Beyond 5 NM from Mainland-
315 PM CDT Sun Aug 17 2025

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

.TONIGHT...East wind 20 to 25 knots with gusts to around 30 knots
becoming southeast 10 to 15 knots with gusts to around 20 knots
late in the night. Chance of showers and slight chance of
thunderstorms after midnight. Showers likely and chance of
thunderstorms late in the night. Waves 5 to 8 feet subsiding to
3 to 5 feet late in the night. Waves occasionally to 10 feet.
.MONDAY...East wind 10 to 15 knots. Gusts up to 20 knots in the
morning. Patchy fog in the morning. Showers in the morning.
Chance of thunderstorms through the day. Chance of showers in the
afternoon. Waves 2 to 4 feet subsiding to 1 to 2 feet in the
afternoon.
.MONDAY NIGHT...Northeast wind 5 to 10 knots becoming north 10 to
15 knots with gusts to around 20 knots early in the morning.
Chance of showers and thunderstorms in the evening. Waves 1 to
2 feet.
.TUESDAY...North wind 10 to 15 knots with gusts to around
20 knots becoming northeast 5 to 10 knots late in the afternoon.
Partly sunny. Waves 1 to 2 feet.

$$

LSZ121-180415-
Chequamegon Bay-Bayfield to Oak Point WI-
315 PM CDT Sun Aug 17 2025

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

.TONIGHT...Northeast wind 20 to 25 knots becoming east 10 to
15 knots after midnight. Slight chance of showers and
thunderstorms in the evening, then showers likely and chance of
thunderstorms after midnight. Patchy fog late in the night. Waves
1 to 3 feet.
.MONDAY...Southeast wind 5 to 10 knots. Patchy fog through the
day. Rain showers likely in the morning. Chance of thunderstorms
through the day. Chance of rain showers in the afternoon. Waves
1 foot or less.
.MONDAY NIGHT...Northeast wind 5 to 10 knots becoming north in
the late evening and overnight. Chance of showers and
thunderstorms in the evening. Waves 1 foot or less.
.TUESDAY...North wind 5 to 10 knots becoming northeast late in
the afternoon. Mostly cloudy. Waves 1 foot or less.

$$

LSZ148-180415-
Oak Point to Saxon Harbor WI-
315 PM CDT Sun Aug 17 2025

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

.TONIGHT...East wind 20 to 25 knots with gusts to around 30 knots
easing to 10 to 15 knots with gusts to around 20 knots after
midnight. Slight chance of showers in the evening, then showers
likely and chance of thunderstorms after midnight. Waves 4 to
7 feet subsiding to 1 to 3 feet. Waves occasionally to 9 feet.
.MONDAY...Southeast wind 5 to 10 knots. Gusts up to 20 knots late
in the morning. Patchy fog through the day. Showers in the
morning. Chance of thunderstorms through the day. Chance of
showers in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Northeast wind 5 to 10 knots becoming north in
the late evening and overnight. Chance of showers and
thunderstorms in the evening. Waves 1 foot or less.
.TUESDAY...North wind 5 to 10 knots becoming northeast late in
the afternoon. Mostly cloudy. Waves 1 to 2 feet.

$$

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

LE