From the National Weather Service:
Flash Flood Warning MAC001-182100- /O.NEW.KBOX.FF.W.0033.180918T1905Z-180918T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Boston/Norton MA 305 PM EDT TUE SEP 18 2018 The National Weather Service in Boston/Norton has issued a * Flash Flood Warning for... Barnstable County in southeastern Massachusetts... * Until 500 PM EDT. * At 305 PM EDT Doppler radar indicated thunderstorms with heavy rainfall moving into the the warned area. Urban and poor drainage flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Plymouth, Barnstable, Falmouth, Brewster, Provincetown, Yarmouth, Sandwich, Bourne, Dennis, Mashpee, Harwich, Chatham, Orleans, Eastham, Wellfleet, Truro, Gosnold and Hyannis. PRECAUTIONARY/PREPAREDNESS ACTIONS... Flooding will occur quickly and could become life threatening for those who try to drive through flooded roads or underpasses. Find alternate routes and avoid flooded areas.