Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

552
FZUS53 KDLH 302058
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
Issued by National Weather Service Twin Cities/Chanhassen MN
358 PM CDT Wed Apr 30 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.

LSZ140-141-010415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
358 PM CDT Wed Apr 30 2025

.TONIGHT...East wind 5 to 10 knots. Mostly cloudy. Waves 1 to
2 feet.
.THURSDAY...Northeast wind 10 to 15 knots with gusts to around
20 knots. Slight chance of rain in the morning, then chance of
rain in the afternoon. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northeast wind 10 to 15 knots with gusts to
around 20 knots. Rain likely through the night. Slight chance of
snow after midnight. Waves 1 to 3 feet.
.FRIDAY...North wind 10 to 15 knots with gusts to around 20 knots
becoming northwest 5 to 10 knots late in the afternoon. Chance of
snow in the morning. Slight chance of rain through the day. Waves
1 to 3 feet.

$$

LSZ142-143-010415-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
358 PM CDT Wed Apr 30 2025

.TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy then
becoming mostly cloudy after midnight then becoming partly
cloudy. Waves 1 to 2 feet.
.THURSDAY...Northeast wind 5 to 10 knots. Chance of rain in the
morning, then rain likely in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Rain likely in the
evening, then chance of rain after midnight. Waves 1 to 3 feet.
.FRIDAY...North wind 5 knots. Chance of rain in the morning.
Waves 1 to 3 feet.

$$

LSZ144-145-010415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
358 PM CDT Wed Apr 30 2025

.TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy until
early morning then becoming mostly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northeast wind 5 to 10 knots. Slight chance of rain
in the morning, then rain in the afternoon. Waves 1 to 2 feet.
.THURSDAY NIGHT...Northeast wind 5 to 10 knots. Rain in the
evening, then rain likely after midnight. Waves 1 to 3 feet.
.FRIDAY...North wind 5 to 10 knots. Chance of rain in the
morning. Waves 1 to 3 feet.

$$

LSZ146-010415-
Port Wing to Sand Island WI-
358 PM CDT Wed Apr 30 2025

.TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy early in
the evening then becoming mostly cloudy. Waves 1 to 2 feet.
.THURSDAY...Northeast wind 5 to 10 knots. Slight chance of rain
in the morning, then rain likely in the afternoon. Waves 1 to
2 feet.
.THURSDAY NIGHT...Northeast wind 5 to 10 knots. Rain likely in
the evening, then chance of rain after midnight. Waves 1 to
3 feet building to 2 to 4 feet in the late evening and overnight.
A small craft advisory may be needed.
.FRIDAY...Northeast wind 5 to 10 knots. Chance of rain through
the day. Waves 2 to 4 feet subsiding to 1 to 3 feet in the
afternoon. A small craft advisory may be needed.

$$

LSZ147-010415-
Sand Island to Bayfield WI-
358 PM CDT Wed Apr 30 2025

.TONIGHT...East wind 5 to 10 knots becoming southeast after
midnight. Partly cloudy early in the evening then becoming mostly
cloudy. Waves 1 foot or less.
.THURSDAY...Southeast wind 5 knots becoming northeast in the
afternoon. Chance of rain in the afternoon. Waves 1 to 2 feet.
.THURSDAY NIGHT...North wind 5 to 10 knots. Gusts up to 20 knots
until early morning. Rain likely through the night. Slight chance
of snow after midnight. Waves 2 to 4 feet. A small craft advisory
may be needed.
.FRIDAY...North wind 5 to 10 knots becoming east late in the
afternoon. Rain likely and chance of snow in the morning. Waves
2 to 4 feet subsiding to 1 to 3 feet in the afternoon. A small
craft advisory may be needed.

$$

LSZ121-010415-
Chequamegon Bay-Bayfield to Oak Point WI-
358 PM CDT Wed Apr 30 2025

.TONIGHT...South wind 5 to 10 knots. Partly cloudy early in the
evening then becoming mostly cloudy. Waves 1 foot or less.
.THURSDAY...Southeast wind 5 knots becoming northeast in the
afternoon. Rain likely in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Rain likely. Waves
1 foot or less.
.FRIDAY...North wind 5 to 10 knots. Chance of rain through the
day. Waves 1 foot or less.

$$

LSZ148-010415-
Oak Point to Saxon Harbor WI-
358 PM CDT Wed Apr 30 2025

.TONIGHT...South wind 5 to 10 knots. Partly cloudy early in the
evening then becoming mostly cloudy. Waves 1 foot or less.
.THURSDAY...Southeast wind 5 knots becoming northeast in the
afternoon. Chance of rain in the afternoon. Waves 1 foot or less.
.THURSDAY NIGHT...North wind 5 to 10 knots. Chance of rain in the
evening, then rain likely after midnight. Waves 1 to 2 feet
building to 3 to 5 feet in the late evening and overnight. Waves
occasionally to 7 feet. A small craft advisory may be needed.
.FRIDAY...North wind 5 to 10 knots. Rain likely in the morning.
Waves 3 to 5 feet. Waves occasionally to 7 feet. A small craft
advisory may be needed.

$$

LSZ150-010415-
Outer Apostle Islands Beyond 5 NM from Mainland-
358 PM CDT Wed Apr 30 2025

.TONIGHT...Southeast wind 5 to 10 knots becoming south after
midnight. Partly cloudy early in the evening then becoming mostly
cloudy. Waves 1 to 2 feet.
.THURSDAY...Southeast wind 5 knots becoming northeast in the
afternoon. Chance of rain in the afternoon. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northeast wind 10 to 15 knots with gusts to
around 20 knots becoming north 5 to 10 knots with gusts to around
20 knots after midnight. Rain in the evening, then rain and snow
likely after midnight. Waves 4 to 6 feet. Waves occasionally to
8 feet. A small craft advisory may be needed.
.FRIDAY...North wind 5 to 10 knots becoming southeast late in the
afternoon. Chance of snow in the morning. Chance of rain through
the day. Waves 4 to 6 feet subsiding to 1 to 3 feet late in the
afternoon. Waves occasionally to 8 feet. A small craft advisory
may be needed.

$$

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

WFO DLH/MPX

Open Waters Forecast

349
FZUS63 KMQT 302002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Wed Apr 30 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...30.3 inch high pressure approaching southern Quebec
tonight while 29.7 inch low pressure spins northeast through the mid
Mississippi Valley Thursday while extending 29.8 inch troughing into
Lake Superior. The low will track into southern Ontario and Quebec
Friday while 30.0 inch ridging gradually builds back over Lake
Superior. This ridge builds to 30.2 inches as it slowly shifts
across the Great Lakes Basin this weekend. On Monday, the ridge
weakens to 30.1 inches over Lake Superior as low pressure at 29.6
inches organizes over the Dakotas.


LSZ162-010800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Wed Apr 30 2025 /301 PM CDT Wed Apr 30 2025/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east late. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of rain showers by mid afternoon. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots backing north
late. Rain showers. Snow showers after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 5 to 15 knots
by mid afternoon. A chance of snow and rain showers through early
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots backing
northeast after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.

$$

LSZ263-010800-
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-
401 PM EDT Wed Apr 30 2025

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing northeast in
the afternoon, then increasing to 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves building to 2 to
4 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots. A chance of
rain showers through midnight, then rain showers, possibly mixed
with snow after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers, possibly
mixed with rain. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-010800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Wed Apr 30 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then diminishing to 5 to 15 knots late. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A slight chance of rain showers by mid afternoon.
Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots. A slight chance
of rain showers through midnight, then snow showers with rain
showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers,
possibly mixed with rain. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast. Waves
building to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-010800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Wed Apr 30 2025

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then becoming southeast 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. A slight
chance of rain showers by mid afternoon. Waves subsiding to calm
to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A chance of rain showers through midnight, then
rain showers, possibly mixed with snow after midnight. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. Rain showers, possibly
mixed with snow through early afternoon, then a chance of snow
showers, possibly mixed with rain by mid afternoon. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.

$$

LSZ266-010800-
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-
401 PM EDT Wed Apr 30 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...South winds 10 to 20 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...Southeast winds 10 to 20 knots backing east late. A
slight chance of rain showers. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. A chance of rain showers. Waves building to 2 to
4 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of rain showers, possibly mixed with
snow. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming south 10 to 20 knots.
Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-010800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Wed Apr 30 2025

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southeast 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots backing north after
midnight. A chance of rain showers. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of rain showers. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ261-010200-
MAFOR 3021/
Superior West 11110 11210 11310 13300 11200 11110. Waves 2 feet
or less.

Superior North Central 11320 11330 12420 11410 12310 11210. Waves
2 to 4 feet building to 3 to 5 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Thursday.

Superior South Central 12320 12420 11410 13310. Waves 2 to 4 feet
tonight. Waves 1 to 3 feet Thursday.

Superior East 12310 11420 14320 11310. Waves 2 to 4 feet.

$$

WFO MQT

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