FZUS53 KDLH 191450

NSHDLH



Nearshore Marine Forecast

National Weather Service Duluth MN

950 AM CDT Tue Aug 19 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.



LSZ140-141-192215-

Grand Portage to Grand Marais MN-

Grand Marais to Taconite Harbor MN-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...South wind 5 knots becoming southwest in the

afternoon. Slight chance of drizzle late in the morning. Waves

1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Patchy dense fog after

midnight. Waves 1 foot or less. 

.WEDNESDAY...North wind 5 knots becoming south in the late

morning and afternoon. Patchy dense fog in the morning. Waves

1 foot or less. 

.WEDNESDAY NIGHT...South wind 5 to 10 knots becoming west after

midnight. Partly cloudy. Waves 1 foot or less. 



$$



LSZ142-143-192215-

Taconite Harbor to Silver Bay Harbor MN-

Silver Bay Harbor to Two Harbors MN-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...Southwest wind 5 knots. Slight chance of drizzle

late in the morning. Waves 1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Patchy dense fog after

midnight. Waves 1 foot or less. 

.WEDNESDAY...North wind 5 knots becoming southeast in the late

morning and afternoon. Patchy dense fog in the morning. Waves

1 foot or less. 

.WEDNESDAY NIGHT...East wind 5 knots becoming northeast after

midnight. Patchy fog after midnight. Waves 1 foot or less. 



$$



LSZ144-145-192215-

Two Harbors to Duluth MN-Duluth MN to Port Wing WI-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...Southwest wind 5 knots becoming east late.

Slight chance of thunderstorms and drizzle late in the morning.

Slight chance of thunderstorms and drizzle late. Waves 1 foot or

less. 

.TONIGHT...Northeast wind 5 knots. Patchy dense fog after

midnight. Waves 1 foot or less. 

.WEDNESDAY...Northeast wind 5 knots. Patchy dense fog in the

morning. Waves 1 foot or less. 

.WEDNESDAY NIGHT...East wind 5 knots. Partly cloudy. Waves 1 foot

or less. 



$$



LSZ146-192215-

Port Wing to Sand Island WI-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...Southwest wind 5 knots becoming north late.

Slight chance of drizzle late in the morning. Waves 1 foot or

less. 

.TONIGHT...Northeast wind 5 knots. Partly cloudy in the evening

then becoming mostly cloudy. Waves 1 foot or less. 

.WEDNESDAY...Northeast wind 5 knots. Mostly sunny. Waves 1 foot

or less. 

.WEDNESDAY NIGHT...East wind 5 knots. Partly cloudy. Waves 1 foot

or less. 



$$



LSZ147-192215-

Sand Island to Bayfield WI-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...West wind 5 knots becoming north late. Partly

sunny. Waves 1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Partly cloudy in the evening

then becoming mostly cloudy. Waves 1 foot or less. 

.WEDNESDAY...Northeast wind 5 knots becoming east in the

afternoon. Mostly sunny. Waves 1 foot or less. 

.WEDNESDAY NIGHT...East wind 5 knots becoming southeast early in

the morning. Partly cloudy. Waves 1 foot or less. 



$$



LSZ150-192215-

Outer Apostle Islands Beyond 5 NM from Mainland-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...West wind 5 knots becoming northwest late.

Partly sunny. Waves 1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Mostly cloudy. Waves 1 foot or

less. 

.WEDNESDAY...Northeast wind 5 knots becoming east in the

afternoon. Mostly sunny. Waves 1 foot or less. 

.WEDNESDAY NIGHT...East wind 5 knots becoming southeast early in

the morning. Partly cloudy. Waves 1 foot or less. 



$$



LSZ121-192215-

Chequamegon Bay-Bayfield to Oak Point WI-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...Northwest wind 5 knots becoming northeast in the

afternoon. Partly sunny. Waves 1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Patchy dense fog after

midnight. Waves 1 foot or less. 

.WEDNESDAY...Northeast wind 5 knots. Patchy dense fog in the

morning. Waves 1 foot or less. 

.WEDNESDAY NIGHT...East wind 5 knots becoming south early in the

morning. Patchy fog after midnight. Waves 1 foot or less. 



$$



LSZ148-192215-

Oak Point to Saxon Harbor WI-

950 AM CDT Tue Aug 19 2025



.REST OF TODAY...Northwest wind 5 knots becoming northeast in the

afternoon. Partly sunny. Waves 1 foot or less. 

.TONIGHT...Northeast wind 5 knots. Partly cloudy in the evening

then becoming mostly cloudy. Waves 1 foot or less. 

.WEDNESDAY...Northeast wind 5 knots. Mostly sunny. Waves 1 foot

or less. 

.WEDNESDAY NIGHT...East wind 5 knots becoming south after

midnight. Mostly clear. Waves 1 foot or less. 



$$



Graphical marine forecasts are available online at: 

weather.gov/greatlakes 



JDS