322
FZUS53 KDLH 180910
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
410 AM CDT Mon Aug 18 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.

LSZ140-141-181615-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
410 AM CDT Mon Aug 18 2025

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

.TODAY...East wind 10 to 15 knots. Gusts up to 30 knots in the
late morning and early afternoon, then decreasing to 25 knots late
in the afternoon. Chance of rain showers and slight chance of
thunderstorms in the morning, then rain showers likely and chance
of thunderstorms in the afternoon. Waves 3 to 5 feet.
.TONIGHT...Northeast wind 10 to 15 knots with gusts to around
20 knots becoming north 5 to 10 knots after midnight. Chance of
showers and thunderstorms in the evening. Patchy fog through the
night. Waves 2 to 4 feet subsiding to 1 to 3 feet early in the
morning.
.TUESDAY...North wind 5 to 10 knots. Partly sunny. Waves 1 to
2 feet.
.TUESDAY NIGHT...North wind 5 knots. Partly cloudy. Waves 1 foot
or less.

$$

LSZ142-143-181615-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
410 AM CDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING...

.TODAY...East wind 10 to 15 knots. Gusts up to 20 knots until
late afternoon. Chance of showers and thunderstorms. Waves 3 to
5 feet subsiding to 1 to 3 feet late in the afternoon.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest after
midnight. Slight chance of showers in the evening. Patchy fog
through the night. Waves 1 to 2 feet.
.TUESDAY...North wind 5 knots becoming northeast late in the
afternoon. Patchy fog in the morning. Waves 1 foot or less.
.TUESDAY NIGHT...Northeast wind 5 knots early in the evening
becoming variable 10 knots or less, then becoming north 5 knots
after midnight becoming variable 10 knots or less. Mostly clear.
Waves 1 foot or less.

$$

LSZ144-145-181615-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
410 AM CDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 7 AM CDT THIS MORNING...

.TODAY...East wind 10 to 15 knots. Chance of showers and
thunderstorms until late afternoon, then slight chance of showers
and thunderstorms late in the afternoon. Waves 2 to 5 feet
subsiding to 1 to 3 feet in the late morning and afternoon.
.TONIGHT...North wind 5 to 10 knots becoming northwest after
midnight. Patchy fog after midnight. Waves 1 foot or less.
.TUESDAY...Northwest wind 5 knots becoming northeast late in the
afternoon. Patchy fog in the morning. Waves 1 foot or less.
.TUESDAY NIGHT...Northeast wind 5 knots. Patchy fog after
midnight. Waves 1 foot or less.

$$

LSZ146-181615-
Port Wing to Sand Island WI-
410 AM CDT Mon Aug 18 2025

.TODAY...East wind 10 to 15 knots becoming northeast 5 to
10 knots late in the afternoon. Rain showers likely in the
morning. Chance of thunderstorms through the day. Chance of rain
showers in the afternoon. Waves 1 to 3 feet.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest in the
late evening and overnight. Patchy fog after midnight. Waves
1 foot or less.
.TUESDAY...Northwest wind 5 knots becoming northeast late in the
afternoon. Patchy fog in the morning. Waves 1 foot or less.
.TUESDAY NIGHT...East wind 5 knots early in the evening becoming
variable 10 knots or less. Patchy fog after midnight. Waves
1 foot or less.

$$

LSZ147-181615-
Sand Island to Bayfield WI-
410 AM CDT Mon Aug 18 2025

.TODAY...East wind 10 to 15 knots. Gusts up to 20 knots in the
late morning and early afternoon. Showers likely early in the
morning. Chance of thunderstorms through the day. Chance of
showers in the late morning and afternoon. Waves 1 to 2 feet.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest in the
late evening and overnight. Slight chance of showers and
thunderstorms in the evening. Patchy fog through the night. Waves
1 foot or less.
.TUESDAY...Northwest wind 5 to 10 knots becoming northeast late
in the afternoon. Patchy fog in the morning. Waves 1 foot or
less.
.TUESDAY NIGHT...East wind 5 knots until early morning becoming
variable 10 knots or less. Mostly clear. Waves 1 foot or less.

$$

LSZ150-181615-
Outer Apostle Islands Beyond 5 NM from Mainland-
410 AM CDT Mon Aug 18 2025

.TODAY...East wind 10 to 15 knots. Gusts up to 20 knots until
late afternoon. Showers likely early in the morning. Chance of
thunderstorms through the day. Chance of showers in the late
morning and afternoon. Waves 2 to 4 feet subsiding to 1 to 2 feet
in the afternoon.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest in the
late evening and overnight. Slight chance of showers and
thunderstorms in the evening. Patchy fog after midnight. Waves
1 to 2 feet.
.TUESDAY...North wind 5 to 10 knots becoming northeast late in
the afternoon. Patchy fog in the morning. Waves 1 to 2 feet.
.TUESDAY NIGHT...East wind 5 knots becoming north early in the
morning. Mostly clear. Waves 1 to 2 feet.

$$

LSZ121-181615-
Chequamegon Bay-Bayfield to Oak Point WI-
410 AM CDT Mon Aug 18 2025

.TODAY...Southeast wind 5 to 10 knots. Gusts up to 20 knots in
the late morning and early afternoon. Rain showers likely early
in the morning. Chance of thunderstorms through the day. Chance
of rain showers in the late morning and afternoon. Waves 1 to
2 feet.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest in the
late evening and overnight. Slight chance of showers and
thunderstorms in the evening. Patchy fog through the night. Waves
1 foot or less.
.TUESDAY...North wind 5 knots becoming northeast late in the
afternoon. Patchy fog in the morning. Waves 1 foot or less.
.TUESDAY NIGHT...East wind 5 knots until early morning becoming
variable 10 knots or less. Patchy fog after midnight. Waves
1 foot or less.

$$

LSZ148-181615-
Oak Point to Saxon Harbor WI-
410 AM CDT Mon Aug 18 2025

.TODAY...Southeast wind 5 to 10 knots with gusts to around
20 knots. Showers likely early in the morning. Chance of
thunderstorms through the day. Chance of showers in the late
morning and afternoon. Waves 1 to 2 feet.
.TONIGHT...Northeast wind 5 to 10 knots becoming northwest in the
late evening and overnight. Slight chance of showers and
thunderstorms in the evening. Patchy fog through the night. Waves
1 foot or less.
.TUESDAY...Northwest wind 5 to 10 knots becoming northeast late
in the afternoon. Patchy fog in the morning. Waves 1 to 2 feet.
.TUESDAY NIGHT...East wind 5 knots. Patchy fog after midnight.
Waves 1 to 2 feet.

$$

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

HA