Active Weather Alerts
Small Craft Advisory
Issued: 6:37 PM Aug. 21, 2025 – National Weather Service
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 PM EDT FRIDAY... * WHAT...Northeast winds 15 to 20 kt with gusts up to 25 kt and waves 1 to 3 feet. * WHERE...Boston Harbor. * WHEN...Until 2 PM EDT Friday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. &&
Coastal Flood Statement
Issued: 5:03 PM Aug. 21, 2025 – National Weather Service
...COASTAL FLOOD STATEMENT IN EFFECT FROM 6 PM EDT THIS EVENING THROUGH LATE FRIDAY NIGHT... * WHAT...Large breaking waves of 10 to 15 feet on ocean beaches. Some splashover on vulnerable coastal roads around high tide tonight through Friday night. * WHERE...Boston and nearby coastal communities. * WHEN...High tides late tonight through Friday night. * IMPACTS...Some water on the lowest lying roads and property. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not drive through flooded roadways. && && Time of high total tides are approximate to the nearest hour. 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 -------- --------- --------- --------- ------- -------- 21/10 AM 9.6/10.1 -0.8/-0.2 0.6/ 1.1 2 None 21/11 PM 11.4/11.9 1.1/ 1.6 0.8/ 1.3 2 None 22/11 AM 10.7/11.2 0.4/ 0.9 1.3/ 1.8 2 None 22/11 PM 11.6/12.1 1.3/ 1.8 1.1/ 1.6 1 None 23/12 PM 10.4/10.9 0.1/ 0.6 0.7/ 1.1 1-2 None 24/12 AM 10.9/11.4 0.6/ 1.1 0.4/ 0.9 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 -------- --------- --------- --------- ------- -------- 21/11 AM 9.3/ 9.8 -0.7/-0.2 0.4/ 0.9 1-2 None 21/11 PM 11.2/11.7 1.3/ 1.8 0.8/ 1.3 2 None 22/11 AM 10.4/10.9 0.5/ 1.0 1.3/ 1.8 2 None 22/11 PM 11.3/11.8 1.4/ 1.9 1.1/ 1.6 1 None 23/12 PM 10.1/10.6 0.2/ 0.7 0.6/ 1.1 1 None 24/12 AM 10.5/11.0 0.6/ 1.1 0.2/ 0.8 1-2 None &&
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