FZUS53 KDLH 171000 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 500 AM CDT Sun May 17 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. LSZ140-171600- Grand Portage to Grand Marais MN- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY MORNING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Slight chance of rain showers late in the afternoon. Waves 1 to 2 feet building to 4 to 7 feet. Waves occasionally to 9 feet. .TONIGHT...Northeast wind 20 to 25 knots. Gusts up to 35 knots decreasing to 25 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 4 to 7 feet. Waves occasionally to 9 feet. A gale warning may be needed. .MONDAY...Northeast wind 15 to 20 knots. Gusts up to 25 knots early in the morning. Chance of rain showers and slight chance of thunderstorms. Waves 3 to 5 feet. .MONDAY NIGHT...Northeast wind up to 30 knots with gales to around 35 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 6 to 9 feet. Waves occasionally to 11 feet. A gale warning may be needed. $$ LSZ141-171600- Grand Marais to Taconite Harbor MN- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... ...GALE WARNING IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THIS EVENING... .TODAY...East wind up to 30 knots with gales to around 35 knots. Partly sunny. Waves 1 to 2 feet building to 5 to 8 feet. Waves occasionally to 10 feet. .TONIGHT...Northeast wind 20 to 25 knots. Gusts up to 35 knots decreasing to 25 knots. Chance of rain showers in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 5 to 8 feet subsiding to 4 to 6 feet early in the morning. Waves occasionally to 11 feet. .MONDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots early in the morning. Chance of rain showers and slight chance of thunderstorms. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 15 to 20 knots with gusts to around 30 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 4 to 6 feet in the late evening and overnight. Waves occasionally to 8 feet. A small craft advisory may be needed. $$ LSZ142-171600- Taconite Harbor to Silver Bay Harbor MN- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... ...GALE WARNING IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THIS EVENING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Mostly sunny early in the morning then becoming mostly cloudy. Waves 1 to 2 feet building to 6 to 9 feet. Waves occasionally to 12 feet. .TONIGHT...Northeast wind 20 to 25 knots with gales to around 35 knots easing to 10 to 15 knots with gusts to around 25 knots early in the morning. Chance of rain showers in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 7 to 10 feet subsiding to 4 to 7 feet early in the morning. Waves occasionally to 13 feet. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers through the day. Slight chance of thunderstorms in the afternoon. Waves 3 to 5 feet subsiding to 1 to 3 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 10 to 15 knots with gusts to around 25 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 4 to 7 feet. Waves occasionally to 9 feet. A small craft advisory may be needed. $$ LSZ143-171600- Silver Bay Harbor to Two Harbors MN- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... ...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH THIS EVENING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Partly sunny. Waves 3 to 5 feet building to 6 to 9 feet in the afternoon. Waves occasionally to 12 feet. .TONIGHT...Northeast wind up to 30 knots with gales to around 35 knots easing to 15 to 20 knots with gusts to around 25 knots early in the morning. Rain showers likely in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 7 to 10 feet subsiding to 4 to 7 feet early in the morning. Waves occasionally to 13 feet. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers and slight chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 1 to 3 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 5 to 10 knots rising to 20 to 25 knots with gusts to around 30 knots in the late evening and overnight. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 4 to 7 feet. Waves occasionally to 9 feet. A small craft advisory may be needed. $$ LSZ144-171600- Two Harbors to Duluth MN- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... ...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH THIS EVENING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Partly sunny. Waves 7 to 10 feet. Waves occasionally to 13 feet. .TONIGHT...Northeast wind up to 30 knots with gales to around 35 knots easing to 15 to 20 knots with gusts to around 25 knots early in the morning. Rain showers likely in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 7 to 10 feet subsiding to 4 to 7 feet early in the morning. Waves occasionally to 14 feet. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers and slight chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 1 to 2 feet late in the afternoon. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind up to 30 knots with gales to around 35 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally to 11 feet. A gale warning may be needed. $$ LSZ145-171600- Duluth MN to Port Wing WI- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... ...GALE WARNING IN EFFECT FROM 10 AM CDT THIS MORNING THROUGH THIS EVENING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Partly sunny. Waves 7 to 10 feet. Waves occasionally to 12 feet. .TONIGHT...Northeast wind up to 30 knots with gales to around 40 knots easing to 15 to 20 knots early in the morning. Rain showers likely in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 7 to 10 feet subsiding to 4 to 6 feet early in the morning. Waves occasionally to 14 feet. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers and slight chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 1 to 3 feet in the afternoon. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind up to 30 knots with gales to around 35 knots. Rain showers and slight chance of thunderstorms. Waves 2 to 4 feet building to 6 to 9 feet in the late evening and overnight. Waves occasionally to 11 feet. A gale warning may be needed. $$ LSZ146-171600- Port Wing to Sand Island WI- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...Northeast wind 20 to 25 knots. Gusts up to 25 knots increasing to 35 knots. Partly sunny. Waves 2 to 4 feet building to 5 to 8 feet. Waves occasionally to 11 feet. .TONIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots easing to 10 to 15 knots with gusts to around 20 knots early in the morning. Chance of rain showers in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 6 to 9 feet subsiding to 4 to 6 feet early in the morning. Waves occasionally to 12 feet. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers and slight chance of thunderstorms through the day. Waves 3 to 5 feet subsiding to 1 to 3 feet in the afternoon. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots. Chance of rain showers in the evening. Slight 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. A small craft advisory may be needed. $$ LSZ147-171600- Sand Island to Bayfield WI- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...East wind 10 to 15 knots with gusts to around 25 knots becoming northeast 20 to 25 knots with gales to around 35 knots in the afternoon. Partly sunny. Waves 1 to 2 feet building to 5 to 8 feet. Waves occasionally to 11 feet. .TONIGHT...Northeast wind 20 to 25 knots with gales to around 35 knots easing to 10 to 15 knots with gusts to around 20 knots early in the morning. Rain showers likely in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 5 to 8 feet subsiding to 4 to 6 feet early in the morning. Waves occasionally to 11 feet. A gale warning may be needed. .MONDAY...Northeast wind 5 to 10 knots. Chance of rain showers and slight chance of thunderstorms. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 15 to 20 knots with gusts to around 30 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 3 to 5 feet building to 5 to 8 feet after midnight. Waves occasionally to 11 feet. A small craft advisory may be needed. $$ LSZ150-171600- Outer Apostle Islands Beyond 5 NM from Mainland- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... ...GALE WARNING IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THIS EVENING... .TODAY...Northeast wind up to 30 knots with gales to around 35 knots. Partly sunny. Waves 1 to 3 feet building to 6 to 9 feet. Waves occasionally to 12 feet. .TONIGHT...Northeast wind up to 30 knots with gales to around 35 knots easing to 15 to 20 knots with gusts to around 25 knots after midnight. Chance of rain showers in the evening. Chance of thunderstorms through the night. Rain showers likely after midnight. Waves 7 to 10 feet subsiding to 4 to 7 feet early in the morning. Waves occasionally to 13 feet. .MONDAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the afternoon. Chance of rain showers and slight chance of thunderstorms. Waves 3 to 5 feet subsiding to 2 to 4 feet in the afternoon. Waves occasionally to 7 feet. A small craft advisory may be needed. .MONDAY NIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 3 to 5 feet building to 7 to 10 feet. Waves occasionally to 13 feet. A small craft advisory may be needed. $$ LSZ121-171600- Chequamegon Bay-Bayfield to Oak Point WI- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...Northeast wind 15 to 20 knots. Gusts up to 20 knots increasing to 30 knots. Partly sunny. Waves 1 to 3 feet. .TONIGHT...Northeast wind 15 to 20 knots with gusts to around 30 knots easing to 5 to 10 knots early in the morning. Rain showers likely in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet. .MONDAY...North wind 5 knots becoming northeast in the late morning and afternoon. Chance of showers and thunderstorms. Waves 1 foot or less. .MONDAY NIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots. Chance of rain showers in the evening. Chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet. A small craft advisory may be needed. $$ LSZ148-171600- Oak Point to Saxon Harbor WI- 500 AM CDT Sun May 17 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...Northeast wind 20 to 25 knots with gusts to around 30 knots. Partly sunny. Waves 1 to 2 feet building to 4 to 7 feet. Waves occasionally to 9 feet. .TONIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots easing to 10 to 15 knots with gusts to around 20 knots after midnight. Rain showers likely and chance of thunderstorms through the night. Waves 4 to 7 feet subsiding to 2 to 4 feet early in the morning. Waves occasionally to 9 feet. .MONDAY...Northwest wind 5 to 10 knots becoming northeast in the late morning and afternoon. Slight chance of thunderstorms in the morning. Chance of rain showers through the day. Chance of thunderstorms in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .MONDAY NIGHT...Northeast wind 20 to 25 knots with gusts to around 30 knots. Rain showers likely and chance of thunderstorms in the evening, then rain showers and slight chance of thunderstorms after midnight. Waves 5 to 8 feet. Waves occasionally to 10 feet. A small craft advisory may be needed. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH