Active Weather Alerts
High Surf Advisory
Issued: 7:15 PM Aug. 20, 2025 – National Weather Service
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 10 PM THURSDAY TO 2 AM EDT FRIDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 10 PM FRIDAY TO 2 AM EDT SATURDAY... * WHAT...For the High Surf Advisory, large breaking waves of 6 to 20 feet in the surf zone. For the first Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.5 to 5.4 feet Mean Lower Low Water). For the second Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.4 to 5.1 feet Mean Lower Low Water). * WHERE...Dukes MA and Nantucket MA Counties. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the first Coastal Flood Advisory, from 10 PM Thursday to 2 AM EDT Friday. For the second Coastal Flood Advisory, from 10 PM Friday to 2 AM EDT Saturday. * IMPACTS...Roads remain passable. Low lying areas and roads near Nantucket Harbor, including Easy Street, may experience pockets of shallow flooding less than one foot deep. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && && Time of high total tides are approximate to the nearest hour. Edgartown MLLW Categories - Minor 4.0 ft, Moderate 5.0 ft, Major 7.0 ft MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 4.3 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/10 PM 3.6/ 4.1 0.9/ 1.4 0.6/ 1.1 4-5 None 21/11 AM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 5-6 None 21/11 PM 4.2/ 4.7 1.5/ 2.0 1.3/ 1.8 7-9 Minor 22/12 PM 3.6/ 4.1 0.9/ 1.4 1.5/ 2.0 6-7 None 23/12 AM 3.7/ 4.2 1.1/ 1.6 1.1/ 1.6 4-5 Minor 23/01 PM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 4 None Vineyard Haven MLLW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/09 PM 2.7/ 3.2 0.8/ 1.3 0.8/ 1.3 3-4 None 21/10 AM 2.2/ 2.7 0.2/ 0.8 0.6/ 1.1 4 None 21/11 PM 3.2/ 3.7 1.3/ 1.8 1.2/ 1.7 5-7 None 22/12 PM 3.2/ 3.7 1.2/ 1.7 1.4/ 1.9 5-6 None 22/11 PM 3.2/ 3.7 1.2/ 1.7 1.2/ 1.7 3-4 None 23/12 PM 2.5/ 3.0 0.5/ 1.0 0.7/ 1.1 3 None Nantucket Harbor MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/11 PM 4.5/ 5.0 0.9/ 1.4 0.5/ 1.0 5 None 21/11 AM 3.4/ 3.9 -0.2/ 0.2 0.5/ 1.0 6 None 22/12 AM 5.2/ 5.7 1.6/ 2.0 1.2/ 1.7 9-11 Minor 22/12 PM 4.5/ 5.0 0.9/ 1.4 1.5/ 2.0 9-10 None 23/12 AM 4.9/ 5.4 1.3/ 1.8 1.1/ 1.6 7-8 Minor 23/01 PM 3.7/ 4.2 0.1/ 0.6 0.6/ 1.1 6 None &&
Coastal Flood Advisory
Issued: 7:15 PM Aug. 20, 2025 – National Weather Service
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 10 PM THURSDAY TO 2 AM EDT FRIDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 10 PM FRIDAY TO 2 AM EDT SATURDAY... * WHAT...For the High Surf Advisory, large breaking waves of 6 to 20 feet in the surf zone. For the first Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.5 to 5.4 feet Mean Lower Low Water). For the second Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.4 to 5.1 feet Mean Lower Low Water). * WHERE...Dukes MA and Nantucket MA Counties. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the first Coastal Flood Advisory, from 10 PM Thursday to 2 AM EDT Friday. For the second Coastal Flood Advisory, from 10 PM Friday to 2 AM EDT Saturday. * IMPACTS...Roads remain passable. Low lying areas and roads near Nantucket Harbor, including Easy Street, may experience pockets of shallow flooding less than one foot deep. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && && Time of high total tides are approximate to the nearest hour. Edgartown MLLW Categories - Minor 4.0 ft, Moderate 5.0 ft, Major 7.0 ft MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 4.3 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/10 PM 3.6/ 4.1 0.9/ 1.4 0.6/ 1.1 4-5 None 21/11 AM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 5-6 None 21/11 PM 4.2/ 4.7 1.5/ 2.0 1.3/ 1.8 7-9 Minor 22/12 PM 3.6/ 4.1 0.9/ 1.4 1.5/ 2.0 6-7 None 23/12 AM 3.7/ 4.2 1.1/ 1.6 1.1/ 1.6 4-5 Minor 23/01 PM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 4 None Vineyard Haven MLLW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/09 PM 2.7/ 3.2 0.8/ 1.3 0.8/ 1.3 3-4 None 21/10 AM 2.2/ 2.7 0.2/ 0.8 0.6/ 1.1 4 None 21/11 PM 3.2/ 3.7 1.3/ 1.8 1.2/ 1.7 5-7 None 22/12 PM 3.2/ 3.7 1.2/ 1.7 1.4/ 1.9 5-6 None 22/11 PM 3.2/ 3.7 1.2/ 1.7 1.2/ 1.7 3-4 None 23/12 PM 2.5/ 3.0 0.5/ 1.0 0.7/ 1.1 3 None Nantucket Harbor MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/11 PM 4.5/ 5.0 0.9/ 1.4 0.5/ 1.0 5 None 21/11 AM 3.4/ 3.9 -0.2/ 0.2 0.5/ 1.0 6 None 22/12 AM 5.2/ 5.7 1.6/ 2.0 1.2/ 1.7 9-11 Minor 22/12 PM 4.5/ 5.0 0.9/ 1.4 1.5/ 2.0 9-10 None 23/12 AM 4.9/ 5.4 1.3/ 1.8 1.1/ 1.6 7-8 Minor 23/01 PM 3.7/ 4.2 0.1/ 0.6 0.6/ 1.1 6 None &&
Coastal Flood Advisory
Issued: 7:15 PM Aug. 20, 2025 – National Weather Service
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY... ...COASTAL FLOOD ADVISORY IN EFFECT FROM 10 PM THURSDAY TO 2 AM EDT FRIDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 10 PM FRIDAY TO 2 AM EDT SATURDAY... * WHAT...For the High Surf Advisory, large breaking waves of 6 to 20 feet in the surf zone. For the first Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.5 to 5.4 feet Mean Lower Low Water). For the second Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.4 to 5.1 feet Mean Lower Low Water). * WHERE...Dukes MA and Nantucket MA Counties. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the first Coastal Flood Advisory, from 10 PM Thursday to 2 AM EDT Friday. For the second Coastal Flood Advisory, from 10 PM Friday to 2 AM EDT Saturday. * IMPACTS...Roads remain passable. Low lying areas and roads near Nantucket Harbor, including Easy Street, may experience pockets of shallow flooding less than one foot deep. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && && Time of high total tides are approximate to the nearest hour. Edgartown MLLW Categories - Minor 4.0 ft, Moderate 5.0 ft, Major 7.0 ft MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 4.3 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/10 PM 3.6/ 4.1 0.9/ 1.4 0.6/ 1.1 4-5 None 21/11 AM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 5-6 None 21/11 PM 4.2/ 4.7 1.5/ 2.0 1.3/ 1.8 7-9 Minor 22/12 PM 3.6/ 4.1 0.9/ 1.4 1.5/ 2.0 6-7 None 23/12 AM 3.7/ 4.2 1.1/ 1.6 1.1/ 1.6 4-5 Minor 23/01 PM 2.7/ 3.2 0.0/ 0.5 0.6/ 1.1 4 None Vineyard Haven MLLW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/09 PM 2.7/ 3.2 0.8/ 1.3 0.8/ 1.3 3-4 None 21/10 AM 2.2/ 2.7 0.2/ 0.8 0.6/ 1.1 4 None 21/11 PM 3.2/ 3.7 1.3/ 1.8 1.2/ 1.7 5-7 None 22/12 PM 3.2/ 3.7 1.2/ 1.7 1.4/ 1.9 5-6 None 22/11 PM 3.2/ 3.7 1.2/ 1.7 1.2/ 1.7 3-4 None 23/12 PM 2.5/ 3.0 0.5/ 1.0 0.7/ 1.1 3 None Nantucket Harbor MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 20/11 PM 4.5/ 5.0 0.9/ 1.4 0.5/ 1.0 5 None 21/11 AM 3.4/ 3.9 -0.2/ 0.2 0.5/ 1.0 6 None 22/12 AM 5.2/ 5.7 1.6/ 2.0 1.2/ 1.7 9-11 Minor 22/12 PM 4.5/ 5.0 0.9/ 1.4 1.5/ 2.0 9-10 None 23/12 AM 4.9/ 5.4 1.3/ 1.8 1.1/ 1.6 7-8 Minor 23/01 PM 3.7/ 4.2 0.1/ 0.6 0.6/ 1.1 6 None &&
Gale Warning
Issued: 6:31 PM Aug. 20, 2025 – National Weather Service
...GALE WARNING IN EFFECT FROM 2 PM THURSDAY TO 8 PM EDT FRIDAY... * WHAT...Northeast winds 25 to 35 kt with gusts up to 40 kt and seas 7 to 10 feet expected. * WHERE...Nantucket Sound. * WHEN...From 2 PM Thursday to 8 PM EDT Friday. * IMPACTS...Strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions. &&
Wind Advisory
Issued: 5:46 PM Aug. 20, 2025 – National Weather Service
...WIND ADVISORY IN EFFECT FROM 5 PM THURSDAY TO 2 PM EDT FRIDAY... * WHAT...Northeast winds 15 to 30 mph with gusts up to 50 mph expected. * WHERE...Barnstable MA, Dukes MA, and Nantucket MA Counties. * WHEN...From 5 PM Thursday to 2 PM EDT Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and some power outages may result. * ADDITIONAL DETAILS...Highest winds expected near Nantucket and the outer portions of Cape Cod. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. &&
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