Nearshore Forecast

905
FZUS53 KDLH 112050
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
350 PM CDT Mon Aug 11 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.

LSZ140-141-120415-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
350 PM CDT Mon Aug 11 2025

.TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 20 knots
early in the evening then 20 knots after midnight. Slight chance
of showers and thunderstorms after midnight. Waves 1 to 3 feet.
.TUESDAY...West wind 15 to 20 knots. Gusts up to 25 knots
increasing to 30 knots in the afternoon. Slight chance of showers
and thunderstorms through the day. Waves 2 to 4 feet. A small
craft advisory may be needed.
.TUESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 25 knots.
Areas of smoke in the evening. Waves 1 to 3 feet subsiding to
1 to 2 feet in the late evening and overnight.
.WEDNESDAY...Northwest wind 5 to 10 knots becoming southwest in
the afternoon. Mostly sunny. Waves 1 foot or less.

$$

LSZ142-143-120415-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
350 PM CDT Mon Aug 11 2025

.TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 20 knots
after midnight. Areas of smoke until early morning. Chance of
showers after midnight. Chance of thunderstorms after midnight.
Slight chance of showers late in the night. Waves 1 to 2 feet.
.TUESDAY...Southwest wind 10 to 15 knots becoming west 5 to
10 knots in the late morning and afternoon. Gusts up to 20 knots.
Slight chance of showers through the day. Slight chance of
thunderstorms in the afternoon. Areas of smoke in the afternoon.
Waves 1 to 2 feet.
.TUESDAY NIGHT...West wind 5 to 10 knots. Gusts up to 20 knots
early in the evening. Areas of smoke. Waves 1 foot or less.
.WEDNESDAY...Northwest wind 5 knots becoming south late in the
afternoon. Areas of smoke in the morning. Waves 1 foot or less.

$$

LSZ144-145-120415-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
350 PM CDT Mon Aug 11 2025

.TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 20 knots in
the late evening and overnight. Areas of smoke through the night.
Chance of showers and thunderstorms after midnight. Waves 1 to
2 feet.
.TUESDAY...West wind 10 to 15 knots easing to 10 knots early in
the afternoon, then rising to 10 to 15 knots late in the
afternoon. Gusts up to 20 knots. Mostly sunny. Waves 1 to 2 feet.
.TUESDAY NIGHT...West wind 10 to 15 knots. Gusts up to 20 knots
early in the evening. Areas of smoke. Waves 1 to 2 feet.
.WEDNESDAY...Northwest wind 5 knots. Areas of smoke in the
morning. Waves 1 foot or less.

$$

LSZ146-120415-
Port Wing to Sand Island WI-
350 PM CDT Mon Aug 11 2025

.TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 20 knots
after midnight. Areas of smoke through the night. Chance of
showers and thunderstorms after midnight. Slight chance of
showers and thunderstorms late in the night. Waves 1 to 2 feet.
.TUESDAY...West wind 10 to 15 knots with gusts to around
20 knots. Slight chance of showers. Waves 1 to 2 feet.
.TUESDAY NIGHT...West wind 5 to 10 knots. Gusts up to 20 knots
early in the evening. Areas of smoke through the night. Waves
1 to 2 feet.
.WEDNESDAY...Northwest wind 5 to 10 knots becoming southwest in
the afternoon. Areas of smoke in the morning. Waves 1 foot or
less.

$$

LSZ147-120415-
Sand Island to Bayfield WI-
350 PM CDT Mon Aug 11 2025

.TONIGHT...South wind 10 to 15 knots becoming southwest with
gusts to around 20 knots late in the night. Areas of smoke in the
late evening and overnight. Slight chance of showers and
thunderstorms after midnight. Waves 1 to 2 feet.
.TUESDAY...West wind 10 to 15 knots with gusts to around
20 knots. Areas of smoke in the morning. Slight chance of showers
through the day. Waves 1 to 2 feet.
.TUESDAY NIGHT...West wind 5 to 10 knots. Areas of smoke through
the night. Waves 1 to 2 feet.
.WEDNESDAY...West wind 5 to 10 knots becoming southeast late in
the afternoon. Sunny. Waves 1 foot or less.

$$

LSZ150-120415-
Outer Apostle Islands Beyond 5 NM from Mainland-
350 PM CDT Mon Aug 11 2025

.TONIGHT...South wind 10 to 15 knots with gusts to around
20 knots becoming southwest with gusts to around 20 knots late in
the night. Areas of smoke in the late evening and overnight.
Slight chance of showers and thunderstorms after midnight. Waves
1 to 2 feet.
.TUESDAY...West wind 10 to 15 knots. Gusts up to 20 knots
increasing to 25 knots in the late morning and early afternoon,
then decreasing to 20 knots late in the afternoon. Slight chance
of thunderstorms in the morning. Slight chance of showers through
the day. Waves 1 to 3 feet.
.TUESDAY NIGHT...West wind 10 to 15 knots with gusts to around
20 knots easing to 5 to 10 knots with gusts to around 20 knots in
the late evening and overnight. Areas of smoke. Waves 1 to
2 feet.
.WEDNESDAY...Northwest wind 5 to 10 knots becoming south late in
the afternoon. Sunny. Waves 1 foot or less.

$$

LSZ121-120415-
Chequamegon Bay-Bayfield to Oak Point WI-
350 PM CDT Mon Aug 11 2025

.TONIGHT...Southwest wind 5 to 10 knots. Areas of smoke through
the night. Slight chance of showers and thunderstorms after
midnight. Waves 1 foot or less.
.TUESDAY...West wind 5 to 10 knots with gusts to around 20 knots
becoming 10 knots with gusts to around 20 knots late in the
afternoon. Slight chance of showers. Waves 1 foot or less.
.TUESDAY NIGHT...West wind 5 to 10 knots. Areas of smoke through
the night. Waves 1 foot or less.
.WEDNESDAY...Northwest wind 5 knots becoming northeast late in
the afternoon. Areas of smoke in the morning. Waves 1 foot or
less.

$$

LSZ148-120415-
Oak Point to Saxon Harbor WI-
350 PM CDT Mon Aug 11 2025

.TONIGHT...South wind 10 to 15 knots. Gusts up to 20 knots late
in the night. Areas of smoke through the night. Slight chance of
showers and thunderstorms late in the night. Waves 1 foot or
less.
.TUESDAY...West wind 10 to 15 knots easing to 10 knots late in
the afternoon. Gusts up to 20 knots. Chance of showers and slight
chance of thunderstorms in the morning, then slight chance of
showers in the afternoon. Waves 1 to 2 feet.
.TUESDAY NIGHT...West wind 5 to 10 knots. Areas of smoke through
the night. Waves 1 foot or less.
.WEDNESDAY...Northwest wind 5 to 10 knots becoming northeast late
in the afternoon. Areas of smoke in the morning. Waves 1 foot or
less.

$$

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

BJH

Open Waters Forecast

541
FZUS63 KMQT 112002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon Aug 11 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 29.9 inch trough remains over Lake Superior as a 29.6 inch low
moving into Hudson Bay weakens and a 29.5 inch low over northern
Manitoba digs southeast early this week. This second low moves into
northern Ontario and Hudson Bay late tonight and Tuesday, pulling a
29.7 inch trough through Lake Superior. A 30.1 inch high pressure
then moves out of Manitoba Wednesday while stretching 30.0 inch
ridging into the Upper Great Lakes. This builds to 30.1 inches on
Thursday as the high transits Ontario into Quebec. By Friday, a 29.5
inch low moving over northern Ontario into Hudson Bay is expected to
bring 29.8 inch troughing back over Lake Superior.


LSZ162-120800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon Aug 11 2025 /301 PM CDT Mon Aug 11 2025/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Haze.
Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight. Haze. A slight chance of showers and
thunderstorms after midnight. Waves building to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west late. Haze
through early afternoon. A slight chance of thunderstorms through
early afternoon. A slight chance of showers. Waves 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots veering south after
midnight. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-120800-
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 Mon Aug 11 2025

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots late. Haze after midnight. A slight chance of showers
and thunderstorms after midnight. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west in the
afternoon, then increasing to 20 to 30 knots late. Haze through
early afternoon. A slight chance of showers and thunderstorms
through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves building to 1 to
3 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-120800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon Aug 11 2025

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then increasing to 10 to 20 knots late. Haze after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots late. Haze through early afternoon. A slight chance of
thunderstorms through early afternoon. A slight chance of
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers after midnight. Waves
building to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering northeast.
Waves calm to 2 feet.

$$

LSZ265-120800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon Aug 11 2025

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. Haze through early afternoon. A chance
of showers and a slight chance of thunderstorms. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots veering northwest
late. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots veering northeast. A
chance of showers. Waves calm to 2 feet.

$$

LSZ266-120800-
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 Mon Aug 11 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming west 10 to 20 knots
late. Haze through early afternoon. A chance of showers and
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots veering northwest
late. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots veering north. A
chance of showers. Waves calm to 2 feet.

$$

LSZ267-120800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon Aug 11 2025

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots backing southeast after
midnight, then becoming south 10 to 20 knots late. A slight
chance of showers through midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west late. Haze
through early afternoon. A chance of showers through early
afternoon, then showers likely and a chance of thunderstorms by
mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. A slight chance of
showers and thunderstorms through midnight. Waves building to
2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots veering north. A
chance of showers. Waves calm to 2 feet.

$$

LSZ261-120200-
MAFOR 1121/
Superior West 11510 11410 11420 14530 11530. Waves 1 to 2 feet
building to 2 to 4 feet tonight. Waves 2 to 4 feet Tuesday.

Superior North Central 12510 11410 11420 12520 11530 11640. A
chance of showers Tuesday morning. Waves 1 to 3 feet tonight.
Waves 1 to 3 feet building to 3 to 5 feet Tuesday.

Superior South Central 11100 11300 12410 12510 11520 11620. A
chance of showers and thunderstorms Tuesday afternoon. Waves 2
feet or less tonight. Waves 1 to 3 feet Tuesday.

Superior East 11600 12400 11310 11410 12510 11516. A chance of
thunderstorms Tuesday afternoon. Waves 1 to 3 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

800
FZUS53 KDLH 110834
SRFDLH

Surf Zone Forecast
National Weather Service Duluth MN
334 AM CDT Mon Aug 11 2025

MNZ037-WIZ001-120245-
Carlton/Southern St. Louis-Douglas-
Including the beaches of Minnesota/Park Point and Wisconsin Point
334 AM CDT Mon Aug 11 2025

.TODAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
UV Index**..................Moderate.
Water Temperature...........In the 60s.
Weather.....................Mostly sunny.
High Temperature............In the lower 80s.
Winds.......................Southwest winds 5 to 10 mph.
Sunrise.....................6:01 AM.
Sunset......................8:26 PM.

.TUESDAY...
Swim Risk*..................Low.
Wave Height.................1 foot or less.
Weather.....................Mostly sunny. A slight chance of
showers.
High Temperature............In the upper 70s.
Winds.......................West winds 10 to 15 mph.
Sunrise.....................6:02 AM.
Sunset......................8:25 PM.

.WEDNESDAY...Wave height 1 foot or less. Sunny. Highs in the mid 70s.
Northwest winds around 5 mph.
.THURSDAY...Wave height 1 foot or less. Partly sunny. A chance of
showers and thunderstorms. Highs in the upper 70s. Southeast winds
around 10 mph.
.FRIDAY...Wave height 1 foot or less. Partly sunny. A slight chance
of showers and thunderstorms. Highs around 80. Southwest winds around
10 mph.

&&

Swim Risk Category
* Low Risk - Large waves and dangerous currents are not expected,
however dangerous currents may exist at any time near piers,
breakwalls, and river outlets.
* Moderate Risk - Breaking waves and currents are expected. Stay away
from dangerous areas like piers, breakwalls, and river outlets.
Always have a flotation device with you in the water.
* High Risk - Life-threatening waves and currents are expected. Stay
out of the water and stay away from dangerous areas like piers and
breakwalls.

** For thunderstorm, waterspout, and UV definitions see:
https://www.weather.gov/beach/dlh


$$

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