From the National Weather Service:
URGENT - WEATHER MESSAGE National Weather Service Boston/Norton MA 303 PM EDT Fri Jun 1 2018 MAZ020>023-RIZ005>008-020315- /O.NEW.KBOX.FG.Y.0023.180601T2300Z-180602T1400Z/ Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Vineyard Haven, Bristol, Narragansett, Westerly, Newport, and New Shoreham 303 PM EDT Fri Jun 1 2018 ...DENSE FOG ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 10 AM EDT SATURDAY... The National Weather Service in Boston/Norton has issued a Dense Fog Advisory, which is in effect from 7 PM this evening to 10 AM EDT Saturday. * Location...South Coastal Rhode Island and Massachusetts, including Cape Cod and the Islands. * Visibilities...One quarter mile or less at times. * Timing...Tonight through Saturday morning. * Impacts...Hazardous travel. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Dense Fog Advisory means visibilities will frequently be reduced to less than one quarter mile, for at least 3 hours. If driving, slow down, use your headlights, and leave plenty of distance ahead of you.