From the National Weather Service:
Flood Advisory National Weather Service Boston/Norton MA 556 PM EDT SAT AUG 18 2018 MAC001-190000- /O.NEW.KBOX.FA.Y.0063.180818T2156Z-180819T0000Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Barnstable MA- 556 PM EDT SAT AUG 18 2018 The National Weather Service in Boston/Norton has issued a * Flood Advisory for... Northern Barnstable County in southeastern Massachusetts... * Until 800 PM EDT. * At 554 PM EDT, Doppler radar indicated heavy rain due to thunderstorms over Cape Cod Bay and extending onshore in Sandwich, moving east at 25 mph. This will cause minor flooding on the Bay side of Cape, including the area from Provincetown to Truro which experienced street flooding earlier this afternoon. Many locations will pick up one inch of rain in a short time. * Some locations that will experience minor flooding include... Barnstable, Brewster, Provincetown, Yarmouth, Sandwich, Dennis, Orleans, Eastham, Wellfleet and Truro. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory is issued for minor flooding of roads that usually flood in heavy rain. Do not drive through flooded roads.