FZUS53 KDLH 201821 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 121 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. LSZ140-202200- Grand Portage to Grand Marais MN- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 PM CDT THIS EVENING... .REST OF TODAY...South wind 15 to 20 knots with gusts to around 25 knots. Mostly cloudy. Waves 2 to 4 feet. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots becoming west 5 to 10 knots early in the morning. Mostly clear. 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. $$ LSZ141-202200- Grand Marais to Taconite Harbor MN- 121 PM CDT Mon Apr 20 2026 .REST OF TODAY...South wind 15 to 20 knots. Partly sunny. Waves 1 to 2 feet. .TONIGHT...Southwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 to 10 knots after midnight. Partly cloudy in the evening then becoming clear. Waves 1 to 2 feet. .TUESDAY...West wind 5 knots becoming southwest in the afternoon. Sunny. Waves 1 to 2 feet. .TUESDAY NIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less. Mostly clear. Waves 1 foot or less. $$ LSZ142-202200- Taconite Harbor to Silver Bay Harbor MN- 121 PM CDT Mon Apr 20 2026 .REST OF TODAY...South wind 10 to 15 knots. Partly sunny. Waves 1 foot or less. .TONIGHT...Southwest wind 10 to 15 knots with gusts to around 20 knots becoming west 5 knots after midnight, then becoming northwest early in the morning. 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. $$ LSZ143-202200- Silver Bay Harbor to Two Harbors MN- 121 PM CDT Mon Apr 20 2026 .REST OF TODAY...South wind 15 to 20 knots. Partly sunny. Waves 1 to 3 feet. .TONIGHT...Southwest wind 15 to 20 knots becoming west 5 to 10 knots after midnight. Mostly clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming west late in the morning, then becoming variable 10 knots or less in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming northeast 5 knots after midnight. Mostly clear. Waves 1 foot or less. $$ LSZ144-202200- Two Harbors to Duluth MN- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TODAY...Southwest wind 15 to 20 knots with gusts to around 25 knots. Partly sunny. Waves 1 to 2 feet building to 2 to 4 feet late. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 30 knots becoming west 5 to 10 knots after midnight. 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. $$ LSZ145-202200- Duluth MN to Port Wing WI- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TODAY...Southwest wind 15 to 20 knots. Gusts up to 25 knots increasing to 30 knots late. Mostly cloudy early in the afternoon then becoming mostly sunny. Waves 1 to 2 feet building to 1 to 3 feet late. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 30 knots becoming west 5 to 10 knots after midnight. Mostly clear. Waves 1 to 3 feet. .TUESDAY...Northwest wind 5 knots becoming south early in the afternoon, then becoming southeast late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Variable winds 10 knots or less becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. $$ LSZ146-202200- Port Wing to Sand Island WI- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TODAY...Southwest wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 knots late. Partly sunny. Waves 1 to 3 feet. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots becoming west 5 to 10 knots after midnight. 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. $$ LSZ147-202200- Sand Island to Bayfield WI- 121 PM CDT Mon Apr 20 2026 .REST OF TODAY...Southwest wind 10 to 15 knots with gusts to around 20 knots. Partly sunny. Waves 1 to 2 feet. .TONIGHT...Southwest wind 10 to 15 knots with gusts to around 25 knots becoming west 5 knots early in the morning. Mostly clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots in the morning becoming variable 10 knots or less, then becoming south 5 knots late in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...Southeast wind 5 knots early in the evening becoming variable 10 knots or less, then becoming east 5 knots after midnight. Mostly clear. Waves 1 foot or less. $$ LSZ150-202200- Outer Apostle Islands Beyond 5 NM from Mainland- 121 PM CDT Mon Apr 20 2026 .REST OF TODAY...South wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 knots late. Mostly cloudy. Waves 1 to 2 feet. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots becoming west 5 to 10 knots early in the morning. Mostly 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. $$ LSZ121-202200- Chequamegon Bay-Bayfield to Oak Point WI- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TODAY...Southwest wind 5 to 15 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 25 knots late. Mostly cloudy early in the afternoon then becoming mostly sunny. Waves 1 to 2 feet. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots easing to 5 to 10 knots with gusts to around 20 knots after midnight. Mostly clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. .TUESDAY NIGHT...East wind 5 knots early in the evening becoming variable 10 knots or less. Mostly clear. Waves 1 foot or less. $$ LSZ148-202200- Oak Point to Saxon Harbor WI- 121 PM CDT Mon Apr 20 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .REST OF TODAY...Southwest wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 knots late. Mostly cloudy. Waves 1 to 2 feet. .TONIGHT...Southwest wind 15 to 20 knots with gusts to around 25 knots easing to 5 to 10 knots early in the morning. Mostly clear. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots becoming east late inthe 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. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH