Good afternoon,

An approaching cold front runs into a warm and very humid airmass Wednesday and Thursday, before moving through Southern New England late Thursday or Thursday night. This will generate strong thunderstorms over Southern New England as well as local downpours.

The consequences of such weather would be damage from strong wind gusts and urban/poor drainage flooding from heavy downpours. A tornado cannot be ruled out, but the likelihood is low.  

All of Southern New England is in play Wednesday and Thursday. But the higher likelihood Wednesday will be in Western/Central Massachusetts and Northern Connecticut. This higher likelihood shifts east into Eastern Massachusetts and Rhode Island Wednesday night and Thursday.