From the National Weather Service:
Special Weather Statement National Weather Service Boston/Norton MA 1050 AM EDT Wed Sep 4 2019 ...SEVERE THUNDERSTORMS ARE POSSIBLE IN SOUTHERN NEW ENGLAND THIS AFTERNOON AND EVENING... Damaging thunderstorms are possible in Southern New England. The most likely time would be from 2 PM to 9 PM. The most likely thunderstorm weather would be strong straight-line wind gusts and heavy downpours. Large hail and an isolated tornado are less likely but possible. The best chance for damaging thunderstorms will be in Northern Connecticut and in Western and Central Massachusetts. Everyone should remain alert to the changing weather. If a thunderstorm approaches, you should go indoors.