From the National Weather Service:
Coastal Hazard Message National Weather Service Boston/Norton MA 1018 AM EDT Sun Sep 29 2019 ...HIGH RIP CURRENT RISK MONDAY MASSACHUSETTS AND RHODE ISLAND COASTLINE... .Large long period swells from Hurricane Lorenzo will arrive in the Massachusetts and Rhode Island waters tonight and continue at least into Monday and result in building surf and strengthening rip currents. Thus a high rip current risk exist for Monday. MAZ019-020-022>024-RIZ006>008-292230- /O.CON.KBOX.RP.S.0007.190930T0900Z-190930T2200Z/ Eastern Plymouth MA-Southern Bristol MA-Barnstable MA-Dukes MA- Nantucket MA-Washington RI-Newport RI-Block Island RI- 1018 AM EDT Sun Sep 29 2019 ...HIGH RIP CURRENT RISK REMAINS IN EFFECT FROM LATE TONIGHT THROUGH MONDAY AFTERNOON... * LOCATIONS...In Massachusetts, Eastern Plymouth MA, Southern Bristol MA, Nantucket MA, Barnstable MA and Dukes MA. In Rhode Island, Block Island RI, Newport RI and Washington RI. * TIMING...From late tonight through Monday afternoon. * SURF ZONE IMPACTS...Very strong rip currents will be dangerous to anyone who enters the surf. PRECAUTIONARY/PREPAREDNESS ACTIONS... There is a high risk of rip currents. Rip currents are powerful channels of water flowing quickly away from shore, which occur most often at low spots or breaks in the sandbar and in the vicinity of structures such as groins, jetties and piers. Heed the advice of lifeguards, beach patrol flags and signs. If you become caught in a rip current, yell for help. Remain calm, do not exhaust yourself and stay afloat while waiting for help. If you have to swim out of a rip current, swim parallel to shore and back toward the beach when possible. Do not attempt to swim directly against a rip current as you will tire quickly.