Active Weather Alerts
Coastal Flood Advisory
Issued: 6:31 PM Sep. 28, 2026 – National Weather Service
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... * WHAT...Up to one half foot of inundation above ground level in low-lying areas near shorelines and tidal waterways. * WHERE...Eastern Massachusetts coast, including Cape Cod, Nantucket and Martha's Vineyard * WHEN...Until midnight EDT tonight. * 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. 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. && && Time of high total tides are approximate to the nearest hour. Gloucester Harbor MLLW Categories - Minor 11.5 ft, Moderate 13.0 ft, Major 15.0 ft MHHW Categories - Minor 1.9 ft, Moderate 3.4 ft, Major 5.4 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 10.0/10.5 0.4/ 0.9 0.6/ 1.1 5 None 29/01 PM 10.8/11.3 1.2/ 1.7 0.6/ 1.1 4 None 30/02 AM 9.9/10.4 0.2/ 0.8 0.6/ 1.1 3 None Merrimack River near Newburyport MA MLLW Categories - Minor 11.0 ft, Moderate 12.0 ft, Major 13.5 ft MHHW Categories - Minor 1.5 ft, Moderate 2.5 ft, Major 4.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/02 AM 9.2/ 9.7 -0.3/ 0.2 0.8/ 1.3 4 None 29/02 PM 9.9/10.4 0.4/ 0.9 0.6/ 1.1 3 None 30/02 AM 8.9/ 9.4 -0.7/-0.2 0.6/ 1.1 2 None Boston Harbor MLLW Categories - Minor 12.5 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 2.2 ft, Moderate 3.7 ft, Major 4.7 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 11.0/11.5 0.7/ 1.1 0.8/ 1.3 1-2 None 29/02 PM 11.6/12.1 1.3/ 1.8 0.6/ 1.1 1 None 30/02 AM 10.6/11.1 0.2/ 0.8 0.6/ 1.1 1 None Revere MLLW Categories - Minor 12.5 ft, Moderate 14.5 ft, Major 16.0 ft MHHW Categories - Minor 2.6 ft, Moderate 4.6 ft, Major 6.1 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 10.6/11.1 0.7/ 1.1 0.7/ 1.1 1 None 29/02 PM 11.3/11.8 1.4/ 1.9 0.6/ 1.1 1 None 30/02 AM 10.4/10.9 0.5/ 1.0 0.6/ 1.1 1 None Green Harbor MLLW Categories - Minor 11.5 ft, Moderate 13.5 ft, Major 15.5 ft MHHW Categories - Minor 1.6 ft, Moderate 3.6 ft, Major 5.6 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 10.2/10.7 0.2/ 0.8 0.7/ 1.1 3-4 None 29/02 PM 11.0/11.5 1.1/ 1.6 0.6/ 1.1 3 None 30/02 AM 10.0/10.5 0.1/ 0.6 0.6/ 1.1 2 None Scituate MA MLLW Categories - Minor 11.5 ft, Moderate 13.5 ft, Major 15.5 ft MHHW Categories - Minor 1.8 ft, Moderate 3.8 ft, Major 5.8 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 10.2/10.7 0.5/ 1.0 0.8/ 1.3 4-5 None 29/02 PM 10.8/11.3 1.1/ 1.6 0.6/ 1.1 3-4 None 30/02 AM 9.9/10.4 0.2/ 0.7 0.6/ 1.1 3 None Buzzards Bay at Woods Hole MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 28/10 PM 2.6/ 3.1 0.6/ 1.1 0.6/ 1.1 2-3 None 29/11 AM 3.2/ 3.7 1.2/ 1.7 0.5/ 1.0 2 None 29/11 PM 2.5/ 3.0 0.5/ 1.0 0.6/ 1.1 1 None 30/11 AM 3.2/ 3.7 1.2/ 1.7 0.6/ 1.1 1 None Chatham MA - East Coast MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft MHHW Categories - Minor 3.8 ft, Moderate 6.3 ft, Major 7.8 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 28/02 PM 6.8/ 7.3 1.6/ 2.0 0.9/ 1.4 4 None 29/02 AM 5.9/ 6.4 0.7/ 1.1 0.6/ 1.1 4 None 29/02 PM 6.6/ 7.1 1.4/ 1.9 0.5/ 1.0 3 None 30/03 AM 5.7/ 6.2 0.5/ 1.0 0.6/ 1.1 3 None Chatham - South side MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/02 AM 4.5/ 5.0 0.0/ 0.5 0.6/ 1.1 3 None 29/03 PM 5.2/ 5.7 0.7/ 1.1 0.6/ 1.1 3 None 30/03 AM 4.5/ 5.0 0.0/ 0.5 0.6/ 1.1 2 None Hyannis Harbor MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.5 ft MHHW Categories - Minor 1.2 ft, Moderate 2.7 ft, Major 4.7 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 28/02 PM 4.9/ 5.4 1.1/ 1.6 1.0/ 1.5 2 Minor 29/02 AM 3.9/ 4.4 0.1/ 0.6 0.6/ 1.1 2 None 29/03 PM 4.6/ 5.1 0.8/ 1.3 0.6/ 1.1 2 None 30/03 AM 3.7/ 4.2 0.0/ 0.5 0.6/ 1.1 1 None Provincetown Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 10.7/11.2 0.6/ 1.1 0.7/ 1.1 4 None 29/02 PM 11.4/11.9 1.3/ 1.8 0.6/ 1.1 3 None 30/02 AM 10.5/11.0 0.4/ 0.9 0.6/ 1.1 3 None Dennis - Sesuit Harbor MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 11.2/11.7 0.7/ 1.1 0.8/ 1.3 2 None 29/02 PM 11.9/12.4 1.4/ 1.9 0.6/ 1.1 2 None 30/02 AM 10.9/11.4 0.4/ 0.9 0.6/ 1.1 2 None Sandwich Harbor MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 29/01 AM 9.4/ 9.9 -1.0/-0.5 0.8/ 1.3 2 None 29/02 PM 10.0/10.5 -0.3/ 0.2 0.6/ 1.1 2 None 30/02 AM 9.1/ 9.6 -1.3/-0.8 0.6/ 1.1 1 None Wings Neck MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft Total Total Departure Day/Time Tide Tide from Norm Waves Flood ft MLLW ft MHHW ft ft Impact -------- --------- --------- --------- ------- -------- 28/10 PM 4.7/ 5.2 0.2/ 0.8 0.6/ 1.1 1-2 None 29/11 AM 5.2/ 5.7 0.9/ 1.4 0.6/ 1.1 1 None 29/11 PM 4.5/ 5.0 0.1/ 0.6 0.6/ 1.1 1 None 30/11 AM 5.2/ 5.7 0.8/ 1.3 0.6/ 1.1 1 None 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 -------- --------- --------- --------- ------- -------- 28/11 PM 2.5/ 3.0 -0.2/ 0.2 0.8/ 1.3 3 None 29/12 PM 3.1/ 3.6 0.4/ 0.9 0.5/ 1.0 2 None 30/03 AM 2.3/ 2.8 -0.3/ 0.2 0.6/ 1.1 1-2 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 -------- --------- --------- --------- ------- -------- 29/01 AM 2.1/ 2.6 0.1/ 0.6 0.6/ 1.1 2 None 29/01 PM 2.5/ 3.0 0.5/ 1.0 0.5/ 1.0 2 None 30/03 AM 2.2/ 2.7 0.2/ 0.7 0.6/ 1.1 1 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 -------- --------- --------- --------- ------- -------- 29/02 AM 3.6/ 4.1 0.0/ 0.5 0.5/ 1.0 4 None 29/03 PM 4.5/ 5.0 0.9/ 1.4 0.6/ 1.1 3 None 30/03 AM 3.7/ 4.2 0.1/ 0.6 0.6/ 1.1 2 None &&
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