FZUS53 KDLH 180503 NSHDLH Nearshore Marine Forecast National Weather Service Duluth MN 1203 AM 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. LSZ140-181600- Grand Portage to Grand Marais MN- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 10 to 15 knots. Gusts up to 20 knots in the late morning and early afternoon. Chance of rain showers and slight chance of thunderstorms early in the morning, then slight chance of rain showers late in the morning. Waves 2 to 4 feet. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots. Chance of rain showers in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 4 to 6 feet. Waves occasionally to 8 feet. A small craft advisory may be needed. .TUESDAY...North wind 20 to 25 knots with gusts to around 30 knots becoming northwest 15 to 20 knots with gusts to around 25 knots in the afternoon. Chance of rain showers in the morning. Waves 4 to 7 feet subsiding to 1 to 2 feet. Waves occasionally to 9 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 10 to 15 knots. Gusts up to 20 knots in the evening. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ141-181600- Grand Marais to Taconite Harbor MN- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots becoming west late in the morning, then becoming southeast early in the afternoon becoming northeast late in the afternoon. Chance of rain showers and slight chance of thunderstorms early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots after midnight. Chance of rain showers and slight chance of thunderstorms in the evening, then rain showers after midnight. Waves 1 to 3 feet building to 2 to 4 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 5 to 10 knots with gusts to around 20 knots becoming northwest in the afternoon. Chance of rain showers in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ142-181600- Taconite Harbor to Silver Bay Harbor MN- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming northwest late in the morning, then becoming southeast early in the afternoon becoming northeast late in the afternoon. Slight chance of showers and thunderstorms early in the morning. Waves 3 to 5 feet subsiding to 1 to 2 feet late in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots with gusts to around 20 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 2 to 4 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 5 to 10 knots becoming northwest in the afternoon. Chance of rain showers through the day. Waves 2 to 4 feet subsiding to 1 to 3 feet late in the afternoon. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 knots in the evening becoming variable 10 knots or less. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ143-181600- Silver Bay Harbor to Two Harbors MN- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of showers and thunderstorms early in the morning. Waves 3 to 5 feet subsiding to 1 to 2 feet late in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 2 to 4 feet after midnight. A small craft advisory may be needed. .TUESDAY...North wind 5 to 10 knots becoming northwest in the late morning and afternoon. Chance of rain showers through the day. Waves 2 to 4 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 knots in the evening becoming variable 10 knots or less, then becoming northwest 5 knots early in the morning. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ144-181600- Two Harbors to Duluth MN- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely 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 in the late evening and overnight. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots becoming northwest 5 to 10 knots in the late morning and afternoon. Chance of rain showers. Waves 2 to 4 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ145-181600- Duluth MN to Port Wing WI- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 20 knots late in the evening increasing to 25 knots, then decreasing to 20 knots early in the morning. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet in the late evening and overnight. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest with gusts to around 20 knots in the late morning and afternoon. Chance of rain showers. Waves 2 to 4 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 10 to 15 knots easing to 5 knots after midnight. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ146-181600- Port Wing to Sand Island WI- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...Northeast wind 5 to 10 knots. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 10 to 15 knots. Gusts up to 25 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 3 to 5 feet after midnight. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY...Northeast wind 5 to 10 knots with gusts to around 20 knots becoming northwest in the late morning and afternoon. Chance of rain showers through the day. Waves 3 to 5 feet. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 knots. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ147-181600- Sand Island to Bayfield WI- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming east late in the afternoon. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots with gusts to around 25 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 2 feet building to 3 to 5 feet in the late evening and overnight. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest 5 to 10 knots in the late morning and afternoon. Chance of rain showers in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. Waves occasionally to 7 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 knots. Mostly cloudy. Waves 1 to 2 feet. $$ LSZ150-181600- Outer Apostle Islands Beyond 5 NM from Mainland- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 to 10 knots becoming northeast late in the afternoon. Slight chance of showers and thunderstorms early in the morning. Waves 3 to 5 feet subsiding to 1 to 3 feet late in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 20 knots increasing to 25 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 3 feet building to 5 to 8 feet. Waves occasionally to 10 feet. A small craft advisory may be needed. .TUESDAY...Northeast wind 10 to 15 knots with gusts to around 25 knots becoming northwest 5 to 10 knots in the afternoon. Rain showers likely through the day. Waves 6 to 9 feet subsiding to 4 to 6 feet in the afternoon. Waves occasionally to 11 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 knots. Mostly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. $$ LSZ121-181600- Chequamegon Bay-Bayfield to Oak Point WI- 1203 AM CDT Mon May 18 2026 .TODAY...North wind 5 knots becoming northeast in the afternoon. Slight chance of rain showers early in the morning. Waves 1 to 3 feet. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots in the late evening and early morning decreasing to 20 knots. Rain showers likely in the evening. Slight chance of thunderstorms through the night. Rain showers after midnight. Waves 1 to 3 feet building to 5 to 8 feet. Waves occasionally to 10 feet. A small craft advisory may be needed. .TUESDAY...North wind 10 to 15 knots with gusts to around 20 knots becoming northwest with gusts to around 20 knots in the late morning and afternoon. Rain showers likely through the day. Waves 1 to 2 feet. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy. Waves 1 foot or less. $$ LSZ148-181600- Oak Point to Saxon Harbor WI- 1203 AM CDT Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING... .TODAY...North wind 5 knots becoming northeast in the afternoon. Slight chance of rain showers early in the morning. Waves 2 to 4 feet subsiding to 1 to 3 feet in the afternoon. .TONIGHT...Northeast wind 15 to 20 knots. Gusts up to 25 knots in the late evening and early morning decreasing to 20 knots. Rain showers likely 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. .TUESDAY...North wind 15 to 20 knots with gusts to around 25 knots becoming northwest 10 to 15 knots with gusts to around 20 knots in the late morning and afternoon. Rain showers likely through the day. Waves 5 to 8 feet subsiding to 3 to 5 feet late in the afternoon. Waves occasionally to 10 feet. A small craft advisory may be needed. .TUESDAY NIGHT...Northwest wind 5 to 10 knots. Mostly cloudy. Waves 2 to 4 feet subsiding to 1 to 3 feet in the late evening and overnight. $$ Graphical marine forecasts are available online at: weather.gov/greatlakes WFO DLH