FZUS53 KDLH 212328 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 627 PM CDT Tue Apr 21 2026 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. LSZ140-221000- Grand Portage to Grand Marais MN- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southwest wind 5 to 10 knots becoming east toward daybreak. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 10 to 15 knots. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots with gusts to around 20 knots. Chance of rain and slight chance of thunderstorms after midnight. Waves 1 to 3 feet building to 2 to 4 feet after midnight. .THURSDAY...Northeast wind 15 to 20 knots. Gusts up to 25 knots in the afternoon. Slight chance of rain in the afternoon. Waves 3 to 5 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. $$ LSZ141-221000- Grand Marais to Taconite Harbor MN- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southwest wind 5 to 10 knots early in the evening becoming variable 10 knots or less, then becoming northeast 5 knots toward daybreak. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots with gusts to around 20 knots. Slight chance of rain in the evening. Slight chance of thunderstorms through the night. Chance of rain after midnight. Waves 1 to 2 feet building to 2 to 4 feet in the late evening and overnight. .THURSDAY...East wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 knots in the late morning and afternoon. Slight chance of rain in the afternoon. Waves 3 to 5 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. $$ LSZ142-221000- Taconite Harbor to Silver Bay Harbor MN- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less, then becoming northeast 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 5 to 10 knots. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots after midnight. Chance of rain and slight chance of thunderstorms through the night. Waves 1 to 3 feet building to 2 to 4 feet after midnight. .THURSDAY...Northeast wind 15 to 20 knots. Chance of rain. Waves 3 to 5 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. $$ LSZ143-221000- Silver Bay Harbor to Two Harbors MN- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southeast wind 5 knots becoming northeast in the late evening and overnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 10 to 15 knots. Sunny. Waves 1 to 2 feet. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots until early morning. Chance of rain in the evening. Slight chance of thunderstorms through the night. Slight chance of rain after midnight. Waves 1 to 2 feet building to 1 to 3 feet after midnight. .THURSDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in the afternoon. Chance of rain and slight chance of thunderstorms in the afternoon. Waves 2 to 4 feet. A small craft advisory may be needed. $$ LSZ144-221000- Two Harbors to Duluth MN- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Northeast wind 5 knots. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 10 to 15 knots. Sunny. Waves 1 to 2 feet. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots until early morning. Slight chance of rain and thunderstorms. Waves 1 to 3 feet. .THURSDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in the late morning and afternoon. Chance of rain and slight chance of thunderstorms in the afternoon. Waves 1 to 3 feet. $$ LSZ145-221000- Duluth MN to Port Wing WI- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Northeast wind 5 knots. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 10 to 15 knots. Sunny. Waves 1 to 2 feet. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots until early morning. Slight chance of rain and thunderstorms. Waves 1 to 3 feet. .THURSDAY...Northeast wind 10 to 15 knots. Gusts up to 25 knots. Chance of rain and slight chance of thunderstorms in the afternoon. Waves 1 to 3 feet. $$ LSZ146-221000- Port Wing to Sand Island WI- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...East wind 5 knots early in the evening becoming variable 10 knots or less, then becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 10 to 15 knots. Sunny. Waves 1 to 2 feet. .WEDNESDAY NIGHT...Northeast wind 10 to 15 knots. Slight chance of rain and thunderstorms through the night. Waves 1 to 2 feet. .THURSDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in the afternoon. Chance of rain and slight chance of thunderstorms in the afternoon. Waves 1 to 2 feet building to 2 to 4 feet late in the afternoon. $$ LSZ147-221000- Sand Island to Bayfield WI- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less, then becoming southeast 5 knots toward daybreak. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...East wind 5 to 10 knots. Slight chance of rain and thunderstorms through the night. Waves 1 to 2 feet. .THURSDAY...East wind 5 to 10 knots. Slight chance of rain. Waves 1 to 3 feet building to 2 to 4 feet late in the afternoon. $$ LSZ150-221000- Outer Apostle Islands Beyond 5 NM from Mainland- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southeast wind 5 knots becoming east in the late evening and overnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming northeast in the afternoon. Sunny. Waves 1 to 2 feet. .WEDNESDAY NIGHT...East wind 10 to 15 knots. Gusts up to 20 knots early in the evening. Slight chance of rain and thunderstorms through the night. Waves 1 to 2 feet building to 1 to 3 feet in the late evening and overnight. .THURSDAY...East wind 10 to 15 knots. Gusts up to 20 knots in the afternoon. Slight chance of rain in the afternoon. Waves 3 to 5 feet. A small craft advisory may be needed. $$ LSZ121-221000- Chequamegon Bay-Bayfield to Oak Point WI- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...East wind 5 knots early in the evening becoming variable 10 knots or less, then becoming southeast 5 knots toward daybreak. Clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...East wind 5 knots becoming southeast after midnight. Slight chance of rain and thunderstorms through the night. Waves 1 foot or less. .THURSDAY...Southeast wind 5 to 10 knots. Gusts up to 20 knots in the afternoon. Slight chance of rain. Waves 1 foot or less. $$ LSZ148-221000- Oak Point to Saxon Harbor WI- 627 PM CDT Tue Apr 21 2026 .REST OF TONIGHT...Southeast wind 5 knots. Clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming east in the late morning and afternoon. Sunny. Waves 1 foot or less. .WEDNESDAY NIGHT...East wind 5 to 10 knots becoming southeast after midnight. Slight chance of rain and thunderstorms through the night. Waves 1 to 2 feet. .THURSDAY...Southeast wind 10 to 15 knots. Gusts up to 20 knots in the afternoon. Slight chance of rain. Waves 1 to 2 feet. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH