Active Weather Alerts
Coastal Flood Watch
Issued: 7:09 PM Sep. 23, 2026 – National Weather Service
...COASTAL FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH SATURDAY AFTERNOON... * WHAT...Up to one foot of inundation above ground level possible in low-lying areas near shorelines and tidal waterways (3.7 to 12.9 feet Mean Lower Low Water). * WHERE...Eastern Essex, Suffolk, Eastern Norfolk, Eastern Plymouth, Barnstable, Dukes and Nantucket Counties. * WHEN...From Friday afternoon through Saturday afternoon. * 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. * ADDITIONAL DETAILS...The exact timing for an approaching coastal low pressure remains uncertain. That will become important for peak surge around the times of high tides. Multiple tide cycles will be impacted, which combined with strong onshore flow may result in tides not lowering as well. Beach erosion will also be a concern, mainly for east-facing beaches. 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 -------- --------- --------- --------- ------- -------- 23/10 PM 8.8/ 9.3 -0.9/-0.4 0.0/ 0.5 5-6 None 24/10 AM 8.3/ 8.8 -1.4/-0.9 0.1/ 0.6 6-7 None 24/11 PM 9.2/ 9.7 -0.5/ 0.0 0.2/ 0.8 7 None 25/11 AM 9.6/10.1 0.0/ 0.5 0.8/ 1.3 11-13 None 25/11 PM 10.8/11.3 1.2/ 1.7 1.6/ 2.0 14-16 None 26/12 PM 10.8/11.3 1.2/ 1.7 1.7/ 2.2 17 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 -------- --------- --------- --------- ------- -------- 23/10 PM 8.1/ 8.6 -1.5/-1.0 0.0/ 0.5 4 None 24/10 AM 7.6/ 8.1 -2.0/-1.5 0.1/ 0.6 4-5 None 24/11 PM 8.5/ 9.0 -1.1/-0.6 0.2/ 0.8 5 None 25/11 AM 8.8/ 9.3 -0.8/-0.2 0.8/ 1.3 7-10 None 26/12 AM 10.0/10.5 0.5/ 1.0 1.7/ 2.2 10-12 None 26/12 PM 10.1/10.6 0.6/ 1.1 1.7/ 2.2 11 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.7/10.2 -0.7/-0.2 0.1/ 0.6 2 None 24/10 AM 9.4/ 9.9 -1.0/-0.5 0.2/ 0.7 2 None 24/10 PM 10.2/10.7 -0.2/ 0.3 0.4/ 0.9 2 None 25/11 AM 10.6/11.1 0.2/ 0.8 0.9/ 1.4 2 None 25/11 PM 11.9/12.4 1.6/ 2.0 1.7/ 2.2 2 None 26/12 PM 11.9/12.4 1.6/ 2.0 1.8/ 2.2 2 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.4/ 9.9 -0.6/-0.1 0.1/ 0.6 2 None 24/10 AM 9.0/ 9.5 -1.0/-0.5 0.2/ 0.7 2 None 24/10 PM 9.8/10.3 -0.2/ 0.3 0.4/ 0.9 2 None 25/11 AM 10.3/10.8 0.4/ 0.9 0.9/ 1.4 2 None 25/11 PM 11.6/12.1 1.7/ 2.2 1.7/ 2.2 2 None 26/12 PM 11.5/12.0 1.6/ 2.0 1.7/ 2.2 2 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.1/ 9.6 -0.9/-0.4 0.1/ 0.6 4 None 24/10 AM 8.6/ 9.1 -1.4/-0.9 0.2/ 0.7 4 None 24/11 PM 9.6/10.1 -0.3/ 0.2 0.4/ 0.9 4 None 25/11 AM 9.9/10.4 0.0/ 0.5 1.0/ 1.5 6-8 None 25/11 PM 11.1/11.6 1.2/ 1.7 1.8/ 2.2 10-11 None 26/12 PM 11.5/12.0 1.6/ 2.0 2.1/ 2.6 11-12 Minor 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.0/ 9.5 -0.8/-0.2 0.1/ 0.6 5 None 24/10 AM 8.5/ 9.0 -1.3/-0.8 0.2/ 0.7 5 None 24/11 PM 9.4/ 9.9 -0.3/ 0.2 0.4/ 0.9 6 None 25/11 AM 9.7/10.2 0.0/ 0.5 0.9/ 1.4 8-11 None 25/11 PM 10.9/11.4 1.2/ 1.7 1.7/ 2.2 12-13 None 26/12 PM 11.0/11.5 1.3/ 1.8 1.8/ 2.2 14 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 -------- --------- --------- --------- ------- -------- 23/07 PM 2.7/ 3.2 0.7/ 1.1 0.6/ 1.1 4 None 24/07 AM 2.3/ 2.8 0.4/ 0.9 0.5/ 1.0 4 None 24/07 PM 2.6/ 3.1 0.6/ 1.1 0.5/ 1.0 4 None 25/08 AM 2.8/ 3.4 0.9/ 1.4 0.8/ 1.3 4-6 None 25/08 PM 3.7/ 4.2 1.8/ 2.2 1.6/ 2.0 6 None 26/08 AM 3.7/ 4.2 1.8/ 2.2 1.5/ 2.0 6-7 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 -------- --------- --------- --------- ------- -------- 23/11 PM 5.1/ 5.6 -0.2/ 0.3 0.1/ 0.6 6-7 None 24/11 AM 4.9/ 5.4 -0.3/ 0.2 0.2/ 0.7 7 None 24/11 PM 5.5/ 6.0 0.2/ 0.8 0.4/ 0.9 7-8 None 25/12 PM 6.0/ 6.5 0.8/ 1.3 1.0/ 1.5 12-13 None 26/12 AM 7.3/ 7.8 2.1/ 2.6 2.0/ 2.5 14 None 26/12 PM 7.2/ 7.7 2.0/ 2.5 1.9/ 2.3 13 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 -------- --------- --------- --------- ------- -------- 23/10 PM 4.2/ 4.7 -0.3/ 0.2 0.2/ 0.7 5-6 None 24/11 AM 3.7/ 4.2 -0.9/-0.4 0.2/ 0.7 6 None 24/11 PM 4.4/ 4.9 -0.2/ 0.3 0.4/ 0.9 6-7 None 25/12 PM 4.6/ 5.1 0.1/ 0.6 0.8/ 1.3 10-11 None 26/12 AM 5.5/ 6.0 1.0/ 1.5 1.5/ 2.0 12-13 None 26/12 PM 5.1/ 5.6 0.6/ 1.1 1.1/ 1.6 12 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 -------- --------- --------- --------- ------- -------- 23/11 PM 4.0/ 4.5 0.2/ 0.7 0.4/ 0.9 4 None 24/11 AM 3.4/ 3.9 -0.5/ 0.0 0.2/ 0.8 4 None 24/11 PM 4.2/ 4.7 0.4/ 0.9 0.6/ 1.1 4 None 25/12 PM 4.2/ 4.7 0.4/ 0.9 0.9/ 1.4 6 None 26/12 AM 5.2/ 5.7 1.4/ 1.9 1.6/ 2.0 7 Minor 26/12 PM 4.5/ 5.0 0.7/ 1.1 1.0/ 1.5 7 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.5/10.0 -0.7/-0.2 0.0/ 0.5 5 None 24/10 AM 9.0/ 9.5 -1.1/-0.7 0.1/ 0.6 6 None 24/11 PM 10.0/10.5 -0.2/ 0.3 0.2/ 0.8 6-7 None 25/11 AM 10.3/10.8 0.2/ 0.7 0.8/ 1.3 10-12 None 25/11 PM 11.6/12.1 1.5/ 2.0 1.6/ 2.0 14 None 26/12 PM 11.8/12.3 1.7/ 2.2 1.9/ 2.3 14 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 -------- --------- --------- --------- ------- -------- 23/10 PM 9.8/10.3 -0.8/-0.2 0.1/ 0.6 4 None 24/10 AM 9.4/ 9.9 -1.1/-0.7 0.2/ 0.7 4 None 24/11 PM 10.2/10.7 -0.3/ 0.2 0.4/ 0.9 4-5 None 25/11 AM 10.8/11.3 0.2/ 0.8 1.0/ 1.5 6-7 None 25/11 PM 12.1/12.6 1.6/ 2.0 2.0/ 2.5 8-10 None 26/12 PM 12.7/13.2 2.2/ 2.7 2.5/ 3.0 8 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 -------- --------- --------- --------- ------- -------- 23/10 PM 8.3/ 8.8 -2.0/-1.6 0.2/ 0.7 3 None 24/10 AM 8.0/ 8.5 -2.3/-1.9 0.2/ 0.8 3 None 24/10 PM 8.8/ 9.3 -1.6/-1.1 0.5/ 1.0 3 None 25/11 AM 9.3/ 9.8 -1.1/-0.6 1.1/ 1.6 5-6 None 25/11 PM 10.7/11.2 0.4/ 0.9 2.1/ 2.6 7-8 None 26/11 AM 11.0/11.5 0.7/ 1.1 2.5/ 3.0 8 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 -------- --------- --------- --------- ------- -------- 23/07 PM 4.2/ 4.7 -0.2/ 0.2 0.4/ 0.9 3 None 24/07 AM 4.0/ 4.5 -0.3/ 0.2 0.2/ 0.8 3 None 24/07 PM 4.2/ 4.7 -0.2/ 0.2 0.4/ 0.9 3 None 25/08 AM 4.6/ 5.1 0.2/ 0.7 0.4/ 0.9 3-4 None 25/08 PM 5.0/ 5.5 0.6/ 1.1 0.8/ 1.3 5 None 26/08 AM 5.2/ 5.7 0.9/ 1.4 0.9/ 1.4 5 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 -------- --------- --------- --------- ------- -------- 23/10 PM 3.0/ 3.5 0.2/ 0.8 0.7/ 1.1 5 None 24/11 AM 2.6/ 3.1 -0.2/ 0.3 0.6/ 1.1 5-6 None 24/11 PM 3.0/ 3.5 0.2/ 0.8 0.8/ 1.3 5-6 None 25/11 AM 3.2/ 3.7 0.5/ 1.0 1.2/ 1.7 7 None 25/11 PM 4.0/ 4.5 1.4/ 1.9 2.1/ 2.6 8 Minor 26/09 AM 3.9/ 4.4 1.2/ 1.7 1.8/ 2.2 8 Minor 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 -------- --------- --------- --------- ------- -------- 23/10 PM 2.2/ 2.7 0.2/ 0.7 0.5/ 1.0 4 None 24/10 AM 2.1/ 2.6 0.1/ 0.6 0.5/ 1.0 4 None 24/11 PM 2.3/ 2.8 0.4/ 0.9 0.7/ 1.1 4 None 25/11 AM 2.8/ 3.4 0.9/ 1.4 1.1/ 1.6 6 None 25/11 PM 3.5/ 4.0 1.5/ 2.0 1.8/ 2.2 6-7 None 26/11 AM 3.2/ 3.7 1.2/ 1.7 1.4/ 1.9 6 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 -------- --------- --------- --------- ------- -------- 23/10 PM 3.7/ 4.2 0.1/ 0.6 0.4/ 0.9 6-7 None 24/11 AM 3.4/ 3.9 -0.2/ 0.2 0.4/ 0.9 7-8 None 24/11 PM 3.9/ 4.4 0.2/ 0.8 0.6/ 1.1 7-8 None 25/12 PM 4.2/ 4.7 0.7/ 1.1 1.1/ 1.6 11-12 None 26/12 AM 5.2/ 5.7 1.7/ 2.2 2.0/ 2.5 12-13 Minor 26/12 PM 5.1/ 5.6 1.5/ 2.0 1.7/ 2.2 12 Minor &&
Gale Warning
Issued: 6:24 AM Sep. 23, 2026 – National Weather Service
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 8 AM EDT FRIDAY... ...GALE WARNING IN EFFECT FROM 8 AM FRIDAY TO 8 PM EDT SATURDAY... * WHAT...For the Small Craft Advisory, northeast winds 15 to 25 kt with gusts up to 30 kt and waves 2 to 3 feet. For the Gale Warning, north winds 20 to 30 kt with gusts up to 40 kt and waves 2 to 4 feet expected. * WHERE...Boston Harbor. * WHEN...For the Small Craft Advisory, until 8 AM EDT Friday. For the Gale Warning, from 8 AM Friday to 8 PM EDT Saturday. * IMPACTS...Strong winds will cause hazardous waves 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. &&
Small Craft Advisory
Issued: 6:24 AM Sep. 23, 2026 – National Weather Service
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 8 AM EDT FRIDAY... ...GALE WARNING IN EFFECT FROM 8 AM FRIDAY TO 8 PM EDT SATURDAY... * WHAT...For the Small Craft Advisory, northeast winds 15 to 25 kt with gusts up to 30 kt and waves 2 to 3 feet. For the Gale Warning, north winds 20 to 30 kt with gusts up to 40 kt and waves 2 to 4 feet expected. * WHERE...Boston Harbor. * WHEN...For the Small Craft Advisory, until 8 AM EDT Friday. For the Gale Warning, from 8 AM Friday to 8 PM EDT Saturday. * IMPACTS...Strong winds will cause hazardous waves 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. &&
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