FZUS53 KDLH 190143 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 843 PM CDT Mon May 18 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. LSZ140-191000- Grand Portage to Grand Marais MN- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...Northeast wind 10 to 15 knots becoming north toward daybreak. Gusts up to 25 knots. Chance of rain showers late in the evening. Slight chance of thunderstorms in the late evening and overnight. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet in the late evening and overnight. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest 5 to 10 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late morning and afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. .WEDNESDAY...Northwest wind 5 to 10 knots becoming south 10 to 15 knots with gusts to around 20 knots in the afternoon. Sunny. Waves 1 to 3 feet. $$ LSZ141-191000- Grand Marais to Taconite Harbor MN- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...East wind 10 to 15 knots with gusts to around 25 knots becoming north 5 to 10 knots toward daybreak. Chance of rain showers early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet. .TUESDAY...West wind 5 to 10 knots. Gusts up to 20 knots late in the afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 1 to 3 feet. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. .WEDNESDAY...West wind 5 knots becoming south in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ142-191000- Taconite Harbor to Silver Bay Harbor MN- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...Northeast wind 10 to 15 knots with gusts to around 25 knots becoming north 5 to 10 knots toward daybreak. Rain showers likely early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. .TUESDAY...West wind 5 to 10 knots. Gusts up to 20 knots in the afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. .WEDNESDAY...Northwest wind 5 knots becoming west late in the morning, then becoming south in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ143-191000- Silver Bay Harbor to Two Harbors MN- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots increasing to 25 knots in the late evening and early morning. Rain showers likely early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. .TUESDAY...West wind 5 to 10 knots. Gusts up to 20 knots in the afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in the evening then clearing. Waves 1 to 2 feet. .WEDNESDAY...Northwest wind 5 knots becoming southeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ144-191000- Two Harbors to Duluth MN- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .REST OF TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots increasing to 25 knots in the late evening and early morning, then decreasing to 20 knots toward daybreak. Rain showers likely early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 2 to 4 feet after midnight. .TUESDAY...West wind 10 to 15 knots. Gusts up to 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then clearing. Waves 1 to 2 feet. .WEDNESDAY...West wind 5 knots becoming southeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ145-191000- Duluth MN to Port Wing WI- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .REST OF TONIGHT...Northeast wind 5 to 10 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 25 knots in the late evening and early morning, then easing to 5 to 10 knots with gusts to around 20 knots toward daybreak. Chance of rain showers early in the evening. Slight chance of thunderstorms early in the evening. Rain showers in the late evening and overnight. Waves 1 to 2 feet building to 1 to 3 feet in the late evening and overnight. .TUESDAY...West wind 10 to 15 knots. Gusts up to 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 1 to 3 feet. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. .WEDNESDAY...West wind 5 knots becoming southeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ146-191000- Port Wing to Sand Island WI- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .REST OF TONIGHT...Northeast wind 5 to 10 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 25 knots in the late evening and overnight. Slight chance of rain showers early in the evening. Slight chance of thunderstorms through the night. Rain showers in the late evening and overnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. .TUESDAY...West wind 5 to 10 knots. Gusts up to 20 knots in the afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in the evening then clearing. Waves 1 to 2 feet. .WEDNESDAY...West wind 5 knots early in the morning becoming variable 10 knots or less, then becoming southeast 5 knots late in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ147-191000- Sand Island to Bayfield WI- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY MORNING... .REST OF TONIGHT...Northeast wind 5 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 30 knots in the late evening and early morning, then becoming north 10 to 15 knots with gusts to around 20 knots toward daybreak. Rain showers likely early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet after midnight. .TUESDAY...West wind 10 to 15 knots. Gusts up to 20 knots in the afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 2 feet. .WEDNESDAY...Northwest wind 5 knots becoming southeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ150-191000- Outer Apostle Islands Beyond 5 NM from Mainland- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...Northeast wind 5 to 10 knots with gusts to around 25 knots rising to 20 to 25 knots with gales to around 35 knots in the late evening and early morning, then becoming north 15 to 20 knots with gusts to around 25 knots toward daybreak. Rain showers likely early in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 4 to 6 feet. Waves occasionally to 8 feet. .TUESDAY...Northwest wind 5 to 10 knots becoming west 10 to 15 knots with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. Waves occasionally to 7 feet. .TUESDAY NIGHT...Northwest wind 10 to 15 knots easing to 5 to 10 knots in the late evening and overnight. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 3 feet. .WEDNESDAY...Northwest wind 5 knots becoming southeast in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ121-191000- Chequamegon Bay-Bayfield to Oak Point WI- 843 PM CDT Mon May 18 2026 .REST OF TONIGHT...Northeast wind 5 to 10 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 25 knots in the late evening and early morning, then becoming north 5 to 10 knots toward daybreak. Rain showers and chance of thunderstorms. Waves 1 to 2 feet. .TUESDAY...Northwest wind 5 knots becoming west 10 to 15 knots with gusts to around 20 knots in the late morning and afternoon. Rain showers likely in the morning. Chance of sprinkles in the afternoon. Waves 1 foot or less. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 foot or less. .WEDNESDAY...Northwest wind 5 knots becoming east in the afternoon. Sunny. Waves 1 foot or less. $$ LSZ148-191000- Oak Point to Saxon Harbor WI- 843 PM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .REST OF TONIGHT...Northeast wind 5 knots with gusts to around 20 knots rising to 15 to 20 knots with gusts to around 25 knots in the late evening and early morning, then becoming north 10 to 15 knots with gusts to around 20 knots toward daybreak. Rain showers likely early in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally to 10 feet. .TUESDAY...Northwest wind 5 to 10 knots becoming west 10 to 15 knots with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers in the morning. Chance of sprinkles in the afternoon. Waves 2 to 4 feet. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Gusts up to 20 knots early in the evening. Mostly cloudy in the evening then becoming partly cloudy. Waves 1 to 3 feet. .WEDNESDAY...Northwest wind 5 knots becoming north late in the morning, then becoming east in the afternoon. Sunny. Waves 1 foot or less. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH