FZUS53 KDLH 202309 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 608 PM CDT Mon Apr 20 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. LSZ140-211000- Grand Portage to Grand Marais MN- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots becoming west 10 to 15 knots with gusts to around 20 knots after midnight. Mostly cloudy early in the evening then clearing. Waves 2 to 4 feet. .TUESDAY...West wind 5 to 10 knots becoming southwest in the afternoon. Sunny. Waves 1 to 2 feet. .TUESDAY NIGHT...Southwest wind 5 to 10 knots becoming west late in the evening, then becoming northeast after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ141-211000- Grand Marais to Taconite Harbor MN- 608 PM CDT Mon Apr 20 2026 .REST OF TONIGHT...South wind 5 to 10 knots becoming west in the late evening and overnight. Mostly clear. Waves 1 to 2 feet. .TUESDAY...West wind 5 knots becoming southwest in the afternoon. Sunny. Waves 1 to 2 feet. .TUESDAY NIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ142-211000- Taconite Harbor to Silver Bay Harbor MN- 608 PM CDT Mon Apr 20 2026 .REST OF TONIGHT...South wind 5 to 10 knots becoming northwest toward daybreak. Mostly clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming southwest in the late morning and early afternoon, then becoming variable 10 knots or less late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ143-211000- Silver Bay Harbor to Two Harbors MN- 608 PM CDT Mon Apr 20 2026 .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 to 10 knots after midnight. Mostly clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming west late in the morning, then becoming variable 10 knots or less in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming northeast 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ144-211000- Two Harbors to Duluth MN- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 25 knots becoming west 5 knots toward daybreak. Mostly clear. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. .TUESDAY...Northwest wind 5 knots becoming north late in the morning, then becoming south in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming northeast 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ145-211000- Duluth MN to Port Wing WI- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 25 knots becoming west 5 knots toward daybreak. Partly cloudy early in the evening then becoming clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming south early in the afternoon, then becoming southeast late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ146-211000- Port Wing to Sand Island WI- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 knots toward daybreak. Mostly clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots in the morning becoming variable 10 knots or less. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Northeast wind 5 to 10 knots. Sunny. Waves 1 foot or less. $$ LSZ147-211000- Sand Island to Bayfield WI- 608 PM CDT Mon Apr 20 2026 .REST OF TONIGHT...Southwest wind 5 to 10 knots with gusts to around 20 knots becoming west toward daybreak. Mostly clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots in the morning becoming variable 10 knots or less, then becoming south 5 knots late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less, then becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...East wind 5 knots becoming northeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ150-211000- Outer Apostle Islands Beyond 5 NM from Mainland- 608 PM CDT Mon Apr 20 2026 .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 to 10 knots toward daybreak. Partly cloudy in the evening then becoming clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming west early in the afternoon, then becoming south late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Southeast wind 5 knots becoming east after midnight. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming northeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ121-211000- Chequamegon Bay-Bayfield to Oak Point WI- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 10 to 15 knots with gusts to around 25 knots becoming west 5 knots toward daybreak. Partly cloudy in the evening then becoming clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...East wind 5 knots early in the evening becoming variable 10 knots or less. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ148-211000- Oak Point to Saxon Harbor WI- 608 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 20 knots until early morning. Partly cloudy in the evening then becoming clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots becoming east late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Southeast wind 5 knots becoming south early in the morning. Mostly clear. Waves 1 foot or less. .WEDNESDAY...Southeast wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH