Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

456
FZUS53 KDLH 161919
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
219 PM CDT Sun Mar 16 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.

LSZ140-141-170415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
219 PM CDT Sun Mar 16 2025

.TONIGHT...Northwest wind 5 to 10 knots becoming west after
midnight, then becoming southeast late in the night. Chance of
flurries late in the night. Waves 1 foot or less.
.MONDAY...Southeast wind 10 to 15 knots with gusts to around
20 knots becoming east with gusts to around 20 knots late in the
afternoon. Chance of snow. Waves 1 to 3 feet.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots in the late evening and early morning. Slight chance of
snow in the evening. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in
the late morning and afternoon. Slight chance of snow in the
afternoon. Waves 1 to 3 feet.

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

$$

LSZ142-143-170415-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming southeast after
midnight. Chance of flurries in the late evening and overnight.
Waves 1 foot or less.
.MONDAY...East wind 10 to 15 knots becoming northeast with gusts
to around 25 knots in the afternoon. Chance of snow. Waves 1 to
3 feet.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots early in the evening. Mostly cloudy in the evening then
becoming partly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in
the late morning and afternoon. Slight chance of snow in the
afternoon. Waves 1 to 3 feet.

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

$$

LSZ144-145-170415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming southeast after
midnight. Chance of flurries late in the evening. Chance of
flurries late in the night. Waves 1 foot or less.
.MONDAY...East wind 10 to 15 knots becoming northeast with gusts
to around 25 knots late in the afternoon. Slight chance of snow
through the day. Chance of sprinkles in the afternoon. Waves 1 to
2 feet building to 1 to 3 feet late in the afternoon.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots early in the evening. Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in
the afternoon. Chance of snow in the afternoon. Waves 1 to 3 feet
building to 2 to 4 feet in the afternoon.

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

$$

LSZ146-170415-
Port Wing to Sand Island WI-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming south after midnight.
Chance of flurries in the late evening and overnight. Waves
1 foot or less.
.MONDAY...Southeast wind 5 to 10 knots becoming northeast 10 to
15 knots with gusts to around 20 knots in the afternoon. Slight
chance of snow through the day. Chance of sprinkles in the
afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots early in the evening. Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
late in the afternoon. Slight chance of snow in the afternoon.
Waves 1 to 3 feet.

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

$$

LSZ147-170415-
Sand Island to Bayfield WI-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming south after midnight.
Mostly clear early in the evening then becoming mostly cloudy.
Waves 1 foot or less.
.MONDAY...Southeast wind 5 to 10 knots becoming northeast 10 to
15 knots with gusts to around 20 knots late in the afternoon.
Slight chance of snow. Waves 1 to 2 feet.
.MONDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to
20 knots early in the evening. Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 5 to 10 knots. Gusts up to 20 knots in
the afternoon. Slight chance of snow in the afternoon. Waves 1 to
3 feet.

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

$$

LSZ150-170415-
Outer Apostle Islands Beyond 5 NM from Mainland-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 10 to 15 knots becoming south 5 to 10 knots
after midnight. Partly cloudy in the evening then becoming mostly
cloudy. Waves 1 to 2 feet.
.MONDAY...Southeast wind 10 to 15 knots becoming northeast with
gusts to around 20 knots late in the afternoon. Chance of
flurries in the morning, then slight chance of snow in the
afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Northeast wind 15 to 20 knots with gusts to
around 25 knots easing to 5 to 10 knots early in the morning.
Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in
the afternoon. Slight chance of snow in the afternoon. Waves 2 to
4 feet.

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

$$

LSZ121-170415-
Chequamegon Bay-Bayfield to Oak Point WI-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming south after midnight.
Partly cloudy in the evening then becoming mostly cloudy. Waves
1 foot or less.
.MONDAY...South wind 5 to 10 knots with gusts to around 20 knots
becoming northeast 10 to 15 knots late in the afternoon. Chance
of flurries in the morning, then chance of sprinkles and slight
chance of snow in the afternoon. Waves 1 foot or less.
.MONDAY NIGHT...Northeast wind 15 to 20 knots becoming north 5 to
10 knots after midnight. Mostly cloudy. Waves 1 foot or less.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
late in the afternoon. Slight chance of snow in the afternoon.
Waves 1 to 2 feet.

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

$$

LSZ148-170415-
Oak Point to Saxon Harbor WI-
219 PM CDT Sun Mar 16 2025

.TONIGHT...West wind 5 to 10 knots becoming south after midnight.
Partly cloudy in the evening then becoming mostly cloudy. Waves
1 foot or less.
.MONDAY...South wind 5 to 10 knots with gusts to around 20 knots
becoming northeast 10 to 15 knots late in the afternoon. Chance
of flurries in the morning. Chance of sprinkles through the day.
Slight chance of snow in the afternoon. Waves 1 to 2 feet.
.MONDAY NIGHT...Northeast wind 15 to 20 knots becoming north 5 to
10 knots after midnight. Mostly cloudy. Waves 1 to 3 feet.
.TUESDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots
late in the afternoon. Slight chance of rain and snow in the
afternoon. Waves 1 to 3 feet building to 2 to 4 feet late in the
afternoon.

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

$$

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

Wolfe

Open Waters Forecast

186
FZUS63 KMQT 161956
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
356 PM EDT Sun Mar 16 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...A low pressure at 29.2 inches is over the Quebec and
Ontario line this afternoon. 30.0 inch ridging passes over Lake
Superior tonight while 29.6 inch low pressure forms over the
Dakotas/Montana region. This low will reorganize into a Colorado
Low Tuesday morning at 29.4 inches which will approach the Lower
Great Lakes late Wednesday at around 29.3 inches, eventually
tracking northeastward into southeast Ontario by Thursday morning.
Broad 30.2 inch high over the Texas and Louisiana coastline will
extend 29.9 inch ridging over the lake Thursday.

LSZ162-170400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
356 PM EDT Sun Mar 16 2025 /256 PM CDT Sun Mar 16 2025/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then backing southeast late. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east in the
afternoon, then becoming northeast 15 to 25 knots late. A chance
of snow showers. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. A slight chance
of snow showers through midnight. Waves 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A slight chance of snow showers by mid
afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots. A chance of snow
showers. Waves 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots backing northeast. Waves
building to 1 to 3 feet.

$$

LSZ263-170400-
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-
356 PM EDT Sun Mar 16 2025

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then backing south late. Waves subsiding
to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east late. A
chance of snow showers. Waves building to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. A slight chance
of snow showers through midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.TUESDAY...Northeast winds 10 to 20 knots. A slight chance of
snow showers by mid afternoon. Waves 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...North gales to 35 knots. Waves building to
6 to 10 feet occasionally to 13 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming southwest
10 to 20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ264-170400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
356 PM EDT Sun Mar 16 2025

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Freezing
spray. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing south late. Waves subsiding
to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots backing southeast in the
afternoon. A chance of snow showers. Waves building to 4 to
8 feet occasionally to 10 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots backing northeast
after midnight. A chance of snow showers through midnight. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of rain showers through
midnight. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...North gales to 35 knots. A chance of snow
showers. Waves building to 8 to 12 feet occasionally to 15 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming southwest
10 to 20 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ265-170400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
356 PM EDT Sun Mar 16 2025

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Freezing
spray. Waves 5 to 9 feet occasionally to 11 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots after midnight, then backing south late. Waves subsiding
to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots backing southeast in the
afternoon. A slight chance of snow showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight, then veering northeast late. A
slight chance of snow showers through midnight. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain and snow showers.
Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. A chance of snow showers through early
afternoon. Snow showers likely by mid afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...North gales to 40 knots. Snow showers likely
through midnight, then a chance of snow showers after midnight.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 9 to 12 feet occasionally to 15 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming southwest
15 to 25 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots backing northeast. Waves
building to 1 to 3 feet.

$$

LSZ266-170400-
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-
356 PM EDT Sun Mar 16 2025

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Freezing
spray. Isolated snow showers. Waves 10 to 14 feet occasionally to
18 feet subsiding to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then becoming south 5 to 15 knots late.
Freezing spray through midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. A chance of snow showers. Waves building to
5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then backing northeast late. A
chance of snow showers through midnight. Waves subsiding to 2 to
4 feet.
.TUESDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots. A chance of rain
and snow showers. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. Rain showers likely, possibly mixed
with snow showers through early afternoon, then snow showers by
mid afternoon. Waves building to 5 to 8 feet occasionally to
10 feet.
.WEDNESDAY NIGHT...North gales to 40 knots. Snow showers likely
through midnight, then a chance of snow showers after midnight.
Waves building to 11 to 15 feet occasionally to 19 feet.
.THURSDAY...Northwest gales to 35 knots becoming southwest 15 to
25 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots backing east. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ267-170400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
356 PM EDT Sun Mar 16 2025

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Freezing
spray. Isolated snow showers. Waves 10 to 14 feet occasionally to
18 feet subsiding to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...Northwest winds 20 to 30 knots becoming north 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Freezing spray through midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 10 to 20 knots increasing to 20 to 30 knots
in the afternoon, then backing southeast late. A chance of snow
showers by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming east
10 to 20 knots late. A slight chance of rain and snow showers
through midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...East winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A chance of rain and snow showers. Waves building
to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Rain showers. Snow showers by mid
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...North gales to 40 knots. Snow showers.
Freezing spray after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.THURSDAY...Northwest gales to 35 knots becoming west 15 to
25 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots backing east. Waves
subsiding to 1 to 3 feet.

$$

LSZ261-170400-
MAFOR 1621/
Superior West 12620 11600 11400 11310 12320 11220. Waves 1 to 3
feet.

Superior North Central 11741 11720 11710 11600 11410 11430 12330.
A chance of snow showers Monday. Waves 4 to 7 feet subsiding to 1
to 3 feet tonight. Waves 2 feet or less building to 4 to 7 feet
Monday.

Superior South Central...GALE WARNING IN EFFECT...11751 11731
11720 11600 11410 11430 11440 11340. A chance of snow showers
Monday afternoon. Waves 8 to 12 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 3 feet building to 4 to 7 feet Monday.

Superior East...GALE WARNING IN EFFECT...11751 11741 11730 11810
11200 12430 11340. A chance of snow showers Monday afternoon.
Waves 9 to 13 feet subsiding to 3 to 5 feet tonight. Waves 2 to 3
feet building to 4 to 7 feet Monday.

$$

GS

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

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