FZUS53 KDLH 210537 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 1237 AM CDT Thu May 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. LSZ140-211600- Grand Portage to Grand Marais MN- 1237 AM CDT Thu May 21 2026 .TODAY...Southeast wind 5 to 10 knots. Sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 2 feet. .FRIDAY...East wind 15 to 20 knots with gusts to around 25 knots. Mostly sunny. Waves 1 to 2 feet building to 1 to 3 feet late in the afternoon. .FRIDAY NIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots decreasing to 20 knots after midnight. Slight chance of rain showers after midnight. Waves 2 to 4 feet. $$ LSZ141-211600- Grand Marais to Taconite Harbor MN- 1237 AM CDT Thu May 21 2026 .TODAY...East wind 5 to 10 knots. Mostly sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 2 feet. .FRIDAY...East wind 15 to 20 knots with gusts to around 25 knots. Mostly sunny. Waves 1 to 2 feet building to 1 to 3 feet late in the afternoon. .FRIDAY NIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots decreasing to 20 knots after midnight. Chance of rain showers after midnight. Waves 2 to 4 feet. $$ LSZ142-211600- Taconite Harbor to Silver Bay Harbor MN- 1237 AM CDT Thu May 21 2026 .TODAY...Northeast wind 5 to 10 knots. Mostly 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. .FRIDAY...Northeast wind 10 to 15 knots with gusts to around 25 knots. Mostly sunny. Waves 1 to 2 feet building to 1 to 3 feet late in the afternoon. .FRIDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 25 knots decreasing to 20 knots in the late evening and overnight. Chance of rain showers after midnight. Waves 2 to 4 feet. A small craft advisory may be needed. $$ LSZ143-211600- Silver Bay Harbor to Two Harbors MN- 1237 AM CDT Thu May 21 2026 .TODAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Mostly sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. .FRIDAY...Northeast wind 15 to 20 knots with gusts to around 25 knots. Mostly sunny. Waves 1 to 3 feet. .FRIDAY NIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots decreasing to 20 knots in the late evening and overnight. Chance of rain showers after midnight. Waves 2 to 4 feet. $$ LSZ144-211600- Two Harbors to Duluth MN- 1237 AM CDT Thu May 21 2026 .TODAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Mostly sunny. Waves 1 to 2 feet. .TONIGHT...Northeast wind 10 to 15 knots with gusts to around 20 knots easing to 5 knots early in the morning. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 2 feet. .FRIDAY...Northeast wind 15 to 20 knots with gusts to around 25 knots. Partly sunny. Waves 1 to 2 feet building to 2 to 4 feet in the afternoon. A small craft advisory may be needed. .FRIDAY NIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots early in the evening. Slight chance of rain showers in the evening, then chance of rain showers after midnight. Waves 2 to 4 feet. A small craft advisory may be needed. $$ LSZ145-211600- Duluth MN to Port Wing WI- 1237 AM CDT Thu May 21 2026 .TODAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Mostly sunny. Waves 1 to 2 feet. .TONIGHT...Northeast wind 10 to 15 knots with gusts to around 20 knots easing to 5 knots early in the morning. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 2 feet. .FRIDAY...Northeast wind 15 to 20 knots with gusts to around 25 knots. Partly sunny. Waves 1 to 2 feet building to 2 to 4 feet in the afternoon. A small craft advisory may be needed. .FRIDAY NIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots early in the evening. Slight chance of rain showers in the evening, then chance of rain showers after midnight. Waves 2 to 4 feet. A small craft advisory may be needed. $$ LSZ146-211600- Port Wing to Sand Island WI- 1237 AM CDT Thu May 21 2026 .TODAY...Northeast wind 5 to 10 knots rising to 10 to 15 knots with gusts to around 20 knots in the afternoon. Mostly sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. .FRIDAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Partly sunny. Waves 1 to 2 feet. .FRIDAY NIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots early in the evening. Chance of rain showers after midnight. Waves 2 to 4 feet subsiding to 1 to 3 feet early in the morning. $$ LSZ147-211600- Sand Island to Bayfield WI- 1237 AM CDT Thu May 21 2026 .TODAY...Variable winds 10 knots or less becoming southeast 5 knots late in the morning, then becoming east in the afternoon. Mostly sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots becoming southeast after midnight, then becoming variable 10 knots or less early in the morning. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. .FRIDAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Partly sunny. Waves 1 to 3 feet. .FRIDAY NIGHT...East wind 10 to 15 knots. Gusts up to 20 knots early in the evening. Chance of rain showers after midnight. Waves 2 to 4 feet subsiding to 1 to 2 feet early in the morning. $$ LSZ150-211600- Outer Apostle Islands Beyond 5 NM from Mainland- 1237 AM CDT Thu May 21 2026 .TODAY...Southeast wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. .TONIGHT...East wind 5 to 10 knots becoming southeast after midnight. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 to 2 feet. .FRIDAY...East wind 10 to 15 knots. Gusts up to 25 knots. Partly sunny. Waves 1 to 2 feet building to 2 to 4 feet late in the afternoon. .FRIDAY NIGHT...East wind 10 to 15 knots. Gusts up to 25 knots. Chance of rain showers after midnight. Waves 2 to 4 feet. A small craft advisory may be needed. $$ LSZ121-211600- Chequamegon Bay-Bayfield to Oak Point WI- 1237 AM CDT Thu May 21 2026 .TODAY...Southeast wind 5 knots becoming northeast 10 to 15 knots in the afternoon. Mostly sunny. Waves 1 foot or less. .TONIGHT...Northeast wind 5 to 10 knots becoming south after midnight, then becoming variable 10 knots or less early in the morning. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. .FRIDAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Partly sunny. Waves 1 to 2 feet. .FRIDAY NIGHT...East wind 5 to 10 knots. Chance of rain showers after midnight. Waves 1 to 2 feet. $$ LSZ148-211600- Oak Point to Saxon Harbor WI- 1237 AM CDT Thu May 21 2026 .TODAY...South wind 5 knots becoming east late in the morning, then becoming northeast 10 to 15 knots in the afternoon. Mostly sunny. Waves 1 foot or less. .TONIGHT...East wind 5 to 10 knots becoming south after midnight. Partly cloudy in the evening then becoming mostly cloudy. Waves 1 foot or less. .FRIDAY...Northeast wind 10 to 15 knots with gusts to around 20 knots. Partly sunny. Waves 1 to 3 feet. .FRIDAY NIGHT...East wind 5 to 10 knots. Chance of rain showers after midnight. Waves 1 to 3 feet. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH