The National Weather Service
The watch, issued at 3:30 p.m. Friday, will be in effect until 9 p.m. for communities in Essex, Middlesex, Barnstable, Norfolk, Worcester, Bristol, Plymouth, Dukes, Natucket and Suffolk counties, according to weather.
The watch means that conditions are favorable for the formation of a tornado but that no tornado has been spotted.
was issued earlier in the day. Downpours and damaging winds are expected.