027
FZUS53 KDLH 220133
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
833 PM CDT Thu Aug 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.

LSZ140-141-221015-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Northeast wind 5 knots becoming south late in
the evening, then becoming southwest after midnight. Chance of
showers and thunderstorms through the night. Waves 1 foot or
less.
.FRIDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the afternoon. Slight chance of showers and thunderstorms in the
afternoon. Waves 1 to 2 feet.
.FRIDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
early in the evening then 20 knots after midnight, then
increasing to 25 knots early in the morning. Partly cloudy. Waves
1 to 2 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots late in the afternoon. Slight chance of
rain showers in the afternoon. Waves 1 to 2 feet.

$$

LSZ142-143-221015-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Northeast wind 5 knots becoming west after
midnight. Slight chance of showers early in the evening. Slight
chance of thunderstorms through the night. Chance of showers
after midnight. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Patchy fog in the
morning. Slight chance of showers and thunderstorms in the
afternoon. Waves 1 foot or less.
.FRIDAY NIGHT...Southwest wind 5 to 10 knots becoming west 10 to
15 knots with gusts to around 25 knots after midnight. Mostly
clear. Waves 1 foot or less.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots late in the afternoon. Mostly sunny. Waves
1 to 2 feet.

$$

LSZ144-145-221015-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Northwest wind 5 knots becoming southeast late
in the evening, then becoming southwest after midnight. Slight
chance of showers early in the evening. Slight chance of
thunderstorms through the night. Chance of showers after
midnight. Patchy fog toward daybreak. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Patchy fog in the
morning. Slight chance of showers and thunderstorms through the
day. Waves 1 foot or less.
.FRIDAY NIGHT...West wind 10 to 15 knots. Gusts up to 25 knots.
Mostly clear. Waves 1 to 2 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots late in the afternoon. Mostly sunny. Waves
1 to 3 feet.

$$

LSZ146-221015-
Port Wing to Sand Island WI-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Northeast wind 5 knots becoming southeast late
in the evening, then becoming southwest after midnight. Slight
chance of showers and thunderstorms in the late evening and
overnight. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Patchy fog in the
morning. Slight chance of thunderstorms in the morning. Slight
chance of showers through the day. Chance of thunderstorms in the
afternoon. Waves 1 foot or less.
.FRIDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
after midnight. Mostly clear. Waves 1 to 2 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots late in the afternoon. Mostly sunny. Waves
1 to 3 feet.

$$

LSZ147-221015-
Sand Island to Bayfield WI-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Southeast wind 5 knots becoming southwest
after midnight. Slight chance of showers and thunderstorms after
midnight. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Chance of thunderstorms
and slight chance of showers in the afternoon. Waves 1 foot or
less.
.FRIDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots becoming west with gusts to around 25 knots early
in the morning. Mostly clear. Waves 1 to 3 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 25 knots
decreasing to 20 knots late in the morning, then increasing to
25 knots in the afternoon. Sunny. Waves 1 to 3 feet.

$$

LSZ150-221015-
Outer Apostle Islands Beyond 5 NM from Mainland-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...South wind 5 to 10 knots becoming southwest
after midnight. Slight chance of showers and thunderstorms after
midnight. Waves 1 to 2 feet.
.FRIDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots
early in the afternoon. Chance of thunderstorms and slight chance
of showers in the afternoon. Waves 1 to 2 feet.
.FRIDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots becoming west 15 to 20 knots with gusts to around
25 knots early in the morning. Mostly clear. Waves 1 to 2 feet
building to 1 to 3 feet early in the morning.
.SATURDAY...West wind 15 to 20 knots with gusts to around
25 knots. Mostly sunny. Waves 2 to 4 feet.

$$

LSZ121-221015-
Chequamegon Bay-Bayfield to Oak Point WI-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Slight chance of
showers and thunderstorms after midnight. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Slight chance of showers
and thunderstorms in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 1 foot or less.
.FRIDAY NIGHT...Southwest wind 5 to 10 knots becoming west with
gusts to around 20 knots early in the morning. Mostly clear.
Waves 1 foot or less.
.SATURDAY...West wind 10 knots rising to 10 to 15 knots in the
late morning and afternoon. Gusts up to 20 knots. Sunny. Waves
1 foot or less.

$$

LSZ148-221015-
Oak Point to Saxon Harbor WI-
833 PM CDT Thu Aug 21 2025

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY NIGHT THROUGH
SATURDAY EVENING...

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Slight chance of
showers and thunderstorms after midnight. Waves 1 foot or less.
.FRIDAY...Southwest wind 5 to 10 knots. Slight chance of showers
and thunderstorms in the morning, then chance of showers and
thunderstorms in the afternoon. Waves 1 foot or less.
.FRIDAY NIGHT...Southwest wind 5 to 10 knots with gusts to around
20 knots becoming west 10 to 15 knots with gusts to around
20 knots early in the morning. Mostly clear. Waves 1 to 2 feet.
.SATURDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots in the afternoon. Sunny. Waves 1 to
3 feet.

$$

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

NLy