National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FZUS53 KDLH 220239
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
939 PM CDT Sun Apr 21 2024

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-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Mostly clear.
Waves 1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the late morning and afternoon. Slight chance of rain in the
afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest wind 5 to 10 knots becoming northwest
with gusts to around 20 knots early in the morning. Rain likely.
Waves 1 to 2 feet.
.TUESDAY...Northeast wind 20 to 25 knots. Gusts up to 30 knots
increasing to 35 knots late in the morning, then decreasing to
30 knots early in the afternoon decreasing to 25 knots late in
the afternoon. Chance of rain in the morning. Chance of snow
through the day. Waves 2 to 4 feet building to 4 to 6 feet in the
late morning and afternoon. Waves occasionally to 8 feet. A gale
warning may be needed.

$$

LSZ142-143-221015-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Mostly clear.
Waves 1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the afternoon. Chance of rain in the afternoon. Waves 1 to
2 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots becoming west 5 to
10 knots early in the morning. Chance of rain. Waves 1 to 2 feet.
.TUESDAY...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming northeast 15 to 20 knots with gusts to around
25 knots late in the morning, then rising to up to 30 knots in
the afternoon. Chance of rain and snow likely in the morning,
then slight chance of rain and snow in the afternoon. Waves
1 foot or less building to 4 to 7 feet. Waves occasionally to
9 feet. A small craft advisory may be needed.

$$

LSZ144-145-221015-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Clear in the
late evening and early morning then becoming partly cloudy. Waves
1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the late morning and afternoon. Chance of rain in the afternoon.
Waves 1 to 2 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots becoming west 5 to 10 knots early in the morning.
Chance of rain through the night. Slight chance of thunderstorms
after midnight. Waves 1 to 2 feet.
.TUESDAY...West wind 5 to 10 knots becoming north 15 to 20 knots
with gusts to around 25 knots late in the morning, then becoming
northeast up to 30 knots with gales to around 35 knots in the
afternoon. Slight chance of thunderstorms in the morning. Rain
likely through the day. Chance of snow in the afternoon. Waves
1 to 2 feet building to 5 to 8 feet in the afternoon. Waves
occasionally to 10 feet. A gale warning may be needed.

$$

LSZ146-221015-
Port Wing to Sand Island WI-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...Southwest wind 5 to 10 knots. Mostly clear.
Waves 1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots. Chance of rain in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots easing to 5 to
10 knots in the late evening and overnight. Chance of rain
through the night. Slight chance of thunderstorms after midnight.
Waves 1 to 2 feet.
.TUESDAY...West wind 10 knots becoming north 15 to 20 knots with
gusts to around 30 knots late in the morning, then becoming
northeast up to 30 knots in the afternoon. Snow likely in the
morning. Rain likely through the day. Slight chance of snow in
the afternoon. Waves 1 foot or less building to 5 to 8 feet.
Waves occasionally to 10 feet. A small craft advisory may be
needed.

$$

LSZ147-221015-
Sand Island to Bayfield WI-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...South wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots. Chance of rain in the afternoon. Waves 1 foot or less.
.MONDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots easing to 10 knots late in the evening, then
becoming west after midnight. Rain likely. Waves 1 to 2 feet.
.TUESDAY...West wind 10 to 15 knots with gusts to around 20 knots
becoming northeast 20 to 25 knots with gusts to around 30 knots
in the late morning and afternoon. Rain and snow likely. Waves
1 foot or less building to 4 to 7 feet. Waves occasionally to
9 feet. A small craft advisory may be needed.

$$

LSZ121-221015-
Chequamegon Bay-Bayfield to Oak Point WI-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...West wind 5 knots becoming southwest after
midnight. Mostly clear. Waves 1 foot or less.
.MONDAY...Southwest wind 10 to 15 knots with gusts to around
25 knots. Chance of rain in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots easing to 5 to 10 knots in the late evening and
overnight. Rain likely. Waves 1 foot or less.
.TUESDAY...West wind 10 knots becoming northeast 15 to 20 knots
with gusts to around 30 knots in the late morning and afternoon.
Rain and snow likely. Waves 1 to 3 feet.

$$

LSZ148-221015-
Oak Point to Saxon Harbor WI-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...South wind 5 to 10 knots. Mostly clear. Waves
1 foot or less.
.MONDAY...Southwest wind 10 knots rising to 10 to 15 knots with
gusts to around 20 knots in the late morning and afternoon.
Chance of rain in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots easing to 10 knots early in the morning. Rain
likely. Waves 1 to 2 feet.
.TUESDAY...West wind 10 knots becoming northeast 20 to 25 knots
with gusts to around 30 knots in the late morning and afternoon.
Rain and snow likely. Waves 1 foot or less building to 5 to
8 feet. Waves occasionally to 11 feet. A small craft advisory may
be needed.

$$

LSZ150-221015-
Outer Apostle Islands Beyond 5 NM from Mainland-
939 PM CDT Sun Apr 21 2024

.REST OF TONIGHT...South wind 10 to 15 knots. Mostly clear. Waves
1 to 2 feet.
.MONDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the late morning and afternoon. Chance of rain in the afternoon.
Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots becoming west early in the morning. Rain likely.
Waves 1 to 3 feet.
.TUESDAY...West wind 10 to 15 knots with gusts to around 20 knots
becoming northeast 20 to 25 knots with gusts to around 30 knots
in the late morning and afternoon. Rain and snow likely. Waves
1 to 2 feet building to 5 to 8 feet. Waves occasionally to
11 feet. A small craft advisory may be needed.

$$

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

Britt