Massachusetts Moderate Coastal Flood Watch | Effective 09/24/2026 10:11

* WHAT...For the High Surf Advisory, large breaking waves of 7 to 13 feet expected in the surf zone. For the Coastal Flood Watch, up to one foot of inundation above ground level possible in low-lying areas near shorelines and tidal waterways (3.8 to 12.8 feet Mean Lower Low Water). * WHERE...Eastern Essex MA, Suffolk MA, Eastern Norfolk MA, Eastern Plymouth MA, Barnstable MA, Dukes MA and Nantucket MA Counties. * WHEN...For the High Surf Advisory, from 5 AM Friday to 8 PM EDT Sunday. For the Coastal Flood Watch, from Friday afternoon through Sunday evening. * IMPACTS...Strong northeast winds with large waves will result in minor to perhaps pockets of moderate coastal flooding over multiple high tide cycles from late Friday through the weekend. The greatest risk for coastal flooding appears to be setting up south of Boston and onto the Cape and Islands. In addition...the long duration of northeast winds coupled with large waves over multiple high tide cycles will result in areas of beach erosion.