Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

671
FZUS53 KDLH 251941
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
241 PM CDT Tue Mar 25 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.

LSZ140-141-260415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
241 PM CDT Tue Mar 25 2025

.TONIGHT...West wind 5 to 10 knots easing to 5 knots after
midnight. Partly cloudy. Waves 1 foot or less.
.WEDNESDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots
in the afternoon. Chance of sprinkles in the afternoon. Waves
1 to 2 feet.
.WEDNESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots early in the morning. Partly cloudy. Waves
1 to 2 feet.
.THURSDAY...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming southeast 5 to 10 knots with gusts to around
20 knots late in the afternoon. Sunny. Waves 1 to 2 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ142-143-260415-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
241 PM CDT Tue Mar 25 2025

.TONIGHT...North wind 5 knots becoming west after midnight.
Partly cloudy until early morning then becoming mostly cloudy.
Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 to 10 knots. Mostly sunny. Waves
1 foot or less.
.WEDNESDAY NIGHT...West wind 5 to 10 knots. Gusts up to 20 knots
after midnight. Partly cloudy. Waves 1 foot or less.
.THURSDAY...Northwest wind 5 to 10 knots with gusts to around
20 knots becoming north late in the morning, then becoming east
with gusts to around 20 knots in the afternoon. Sunny. Waves
1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ144-145-260415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
241 PM CDT Tue Mar 25 2025

.TONIGHT...Northeast wind 5 knots becoming west after midnight.
Partly cloudy until early morning then becoming mostly cloudy.
Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 to 10 knots. Mostly sunny. Waves
1 foot or less.
.WEDNESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
early in the morning. Partly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northwest wind 5 to 10 knots becoming east 10 to
15 knots in the afternoon. Mostly sunny. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ146-260415-
Port Wing to Sand Island WI-
241 PM CDT Tue Mar 25 2025

.TONIGHT...East wind 5 knots early in the evening becoming
variable 10 knots or less, then becoming southwest 5 knots after
midnight. Mostly clear until early morning then becoming mostly
cloudy. Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 to 10 knots. Mostly sunny. Waves
1 foot or less.
.WEDNESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
after midnight. Partly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming east 5 to 10 knots in the afternoon. Mostly
sunny. Waves 1 to 2 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ147-260415-
Sand Island to Bayfield WI-
241 PM CDT Tue Mar 25 2025

.TONIGHT...Southeast wind 5 knots becoming southwest after
midnight. Mostly clear until early morning then becoming mostly
cloudy. Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 to 10 knots. Mostly sunny. Waves
1 foot or less.
.WEDNESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
after midnight. Partly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northwest wind 10 to 15 knots with gusts to around
20 knots becoming north 5 knots late in the morning, then
becoming northeast early in the afternoon becoming east late in
the afternoon. Sunny. Waves 1 to 2 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ150-260415-
Outer Apostle Islands Beyond 5 NM from Mainland-
241 PM CDT Tue Mar 25 2025

.TONIGHT...South wind 5 knots becoming southwest after midnight.
Mostly clear until early morning then becoming mostly cloudy.
Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 to 10 knots. Mostly sunny. Waves
1 to 2 feet.
.WEDNESDAY NIGHT...West wind 10 to 15 knots. Gusts up to
25 knots. Partly cloudy. Waves 1 to 3 feet.
.THURSDAY...Northwest wind 10 to 15 knots with gusts to around
25 knots becoming east 5 to 10 knots late in the afternoon.
Sunny. Waves 1 to 3 feet.

Note...Wave height forecasts are for ice free areas.

$$

LSZ121-260415-
Chequamegon Bay-Bayfield to Oak Point WI-
241 PM CDT Tue Mar 25 2025

.TONIGHT...East wind 5 knots becoming south late in the evening,
then becoming southwest after midnight. Partly cloudy. Waves
1 foot or less.
.WEDNESDAY...Southwest wind 5 knots. Mostly sunny. Waves 1 foot
or less.
.WEDNESDAY NIGHT...West wind 5 to 10 knots. Partly cloudy. Waves
1 foot or less.
.THURSDAY...Northwest wind 5 knots becoming northeast in the
afternoon. Mostly sunny. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ148-260415-
Oak Point to Saxon Harbor WI-
241 PM CDT Tue Mar 25 2025

.TONIGHT...East wind 5 knots becoming southwest after midnight.
Partly cloudy. Waves 1 foot or less.
.WEDNESDAY...Southwest wind 5 knots becoming west late in the
afternoon. Mostly sunny. Waves 1 foot or less.
.WEDNESDAY NIGHT...Southwest wind 5 to 10 knots. Partly cloudy.
Waves 1 foot or less.
.THURSDAY...Northwest wind 5 to 10 knots becoming northeast in
the afternoon. Mostly sunny. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

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

Levens

Open Waters Forecast

276
FZUS63 KMQT 251947
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 PM EDT Tue Mar 25 2025

For waters beyond 5 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.

.SYNOPSIS...30.1 inch ridging over the lake will further
increase to 30.2 inches by Wednesday morning. A 29.8 inch low in
northern Ontario Wednesday night arrives in northern Quebec
Thursday, bringing a weak 30.0 inch trough over the lake into
Thursday morning. Meanwhile, a 30.4 inch high pressure moves into
northern Manitoba late in the day, bringing 30.2 inch ridging over
the lake Thursday and Thursday night. The lake then becomes
sandwiched between the now 30.4 inch high moving over northern
Ontario and a 29.5 inch low over the Central Plains Friday night
and Saturday.

LSZ162-260400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EDT Tue Mar 25 2025 /247 PM CDT Tue Mar 25 2025/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots. Waves building to
2 to 4 feet.
.FRIDAY...East winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. Rain and snow. Waves building to 6 to
9 feet occasionally to 11 feet.
.FRIDAY NIGHT...East gales to 35 knots. Rain, possibly mixed with
snow. Sleet likely after midnight. Waves building to 7 to 11 feet
occasionally to 14 feet.
.SATURDAY...Northeast gales to 35 knots diminishing to 20 to
30 knots. A chance of sleet. A chance of snow. Waves building to
7 to 11 feet occasionally to 14 feet.
.SUNDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ263-260400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
347 PM EDT Tue Mar 25 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west less than
10 knots after midnight, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots late. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots becoming east 5 to
15 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain and snow through early
afternoon, then snow, possibly mixed with rain by mid afternoon.
Waves building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...East gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow, possibly mixed with rain. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northeast winds 20 to 30 knots. A chance of snow.
Waves building to 7 to 11 feet occasionally to 14 feet.
.SUNDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

$$

LSZ264-260400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EDT Tue Mar 25 2025

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming northwest 20 to 30 knots
late. A slight chance of drizzle after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of snow through early afternoon, then
snow, possibly mixed with rain by mid afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots. Snow likely through
midnight. A chance of snow after midnight. Waves building to 7 to
10 feet occasionally to 13 feet.
.SATURDAY...East winds 20 to 30 knots backing northeast. A chance
of snow. Waves subsiding to 6 to 9 feet occasionally to 11 feet,
then building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ265-260400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EDT Tue Mar 25 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming west 10 to 20 knots late.
Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. Waves building to 2 to 4 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots. A chance of snow, possibly
mixed with rain through early afternoon, then snow, possibly
mixed with rain and freezing rain likely by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots. Rain through midnight.
Freezing rain and snow. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...East winds 20 to 30 knots. A chance of freezing rain.
A chance of snow. Waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY...Northeast winds 20 to 30 knots. A chance of snow. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-260400-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
347 PM EDT Tue Mar 25 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming northwest 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. A slight chance of drizzle after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming north 15 to
25 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering southeast
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots. A chance of snow through
early afternoon, then snow, possibly mixed with rain by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots. Freezing rain,
possibly mixed with rain through midnight. Snow. Waves building
to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...East winds 20 to 30 knots. A chance of snow. Freezing
rain likely. Waves subsiding to 4 to 8 feet occasionally to
10 feet.
.SUNDAY...Northeast gales to 35 knots diminishing to 20 to
30 knots. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ267-260400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EDT Tue Mar 25 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Isolated
snow showers. Waves 2 to 4 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. A slight chance of snow showers through midnight. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then veering west late. A slight
chance of drizzle after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of snow through early afternoon, then
snow likely by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Rain through midnight. Freezing rain and
snow. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...East winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...Northeast winds 20 to 30 knots. A chance of snow.
Freezing spray. Waves subsiding to 3 to 6 feet occasionally to
8 feet, then building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ261-260400-
MAFOR 2521/
Superior West 12500 13600 11610 12510. Waves 2 feet or less.

Superior North Central 13710 11600 11500 11610 11510 11520. Waves
1 to 3 feet.

Superior South Central 12720 12710 11600 11610 12510. Waves 2 to
4 feet subsiding to 1 to 3 feet tonight. Waves 2 feet or less
Wednesday.

Superior East 11730 11830 11820 11810 11700 11600 11610 11510.
Waves 2 to 4 feet subsiding to 1 to 3 feet tonight through
Wednesday.


$$

TDUD

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

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

Beach Hazards

This product is only issued between May 26th and October 1st.

Other Information

Great Lakes Water Levels and Forecasts - Provided by USACE

GLERL - NOAA Great Lakes Forecast System

NWS Marine Homepage

Cold Water Safety

Park Point Beach Information

Paddle Safe Twin Ports