From the National Weather Service:
Special Weather Statement National Weather Service Boston/Norton MA 1153 AM EDT Wed Aug 7 2019
..STRONG TO SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON AND TONIGHT ACROSS MUCH OF MASSACHUSETTS, RHODE ISLAND AND NORTHERN CONNECTICUT... Two rounds of strong to severe thunderstorms are possible this afternoon and tonight. Showers and thunderstorms will develop this afternoon across northern Connecticut into western and central Massachusetts, mainly from mid afternoon onward. A few storms may produce strong to damaging winds and torrential downpours with localized urban/street flooding possible. There is the potential for a few rotating storms thus a very low risk of an isolated tornado. Another round of thunderstorms is possible this evening and overnight across Rhode Island and eastern Massachusetts with a few strong storms possible.