From the National Weather Service:
Flood Advisory National Weather Service Boston/Norton MA 523 PM EDT SAT AUG 4 2018 MAC001-042330- /O.NEW.KBOX.FA.Y.0029.180804T2123Z-180804T2330Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Barnstable MA- 523 PM EDT SAT AUG 4 2018 The National Weather Service in Boston/Norton has issued a * Flood Advisory for... Barnstable County in southeastern Massachusetts... * Until 730 PM EDT. * At 523 PM EDT, Doppler radar indicated heavy rain due to thunderstorms. This will cause minor flooding in the advisory area. Up to one inch of rain has already fallen. * Some locations that will experience minor flooding include... Barnstable, Falmouth, Brewster, Yarmouth, Sandwich, Dennis, Mashpee, Harwich, Chatham, Orleans, Eastham, Wellfleet, Truro and Hyannis. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory is issued for minor flooding of roads or underpasses that usually flood in heavy rain. Do not drive through flooded roads.