A flash flood warning is in effect until 9 a.m. for Boston and several communities south of the city, including Brockton, Quincy, and Randolph, officials said Thursday morning. The National Weather Service also issued a flood watch that will remain in effect until 4 p.m. for Rhode Island and eastern portions of Massachusetts and Connecticut.

BRAINTREE, Mass. — Drenching downpours quickly turned highways and streets in eastern Massachusetts into rivers, just as traffic started to build for the Thursday morning commute. A large part of Interstate 93 in the Milton-Quincy area was underwater before 7 a.m. as torrential rain moved through.

Significant rainfall caused flooding in yet another state as the National Weather Service issued a flash flood warning in Massachusetts Thursday.

Update: As of 10:59 a.m., all southbound lanes on Interstate 93 in Quincy at Exit 10 have reopened, according to MassDOT. The northbound and southbound sides of Interstate 93 have reopened at Exit 3 in Milton after flooding caused by heavy rain led to a closure,

Thunderstorms caused considerable flooding in the Boston metro area Thursday, with several cars left stranded in the middle of a highway.

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