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.

Heavy rainfall caused areas of flooding on I-93 and other major roadways in Massachusetts on Thursday morning.

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.

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

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Insurance brokers say more people are asking whether they should buy flood insurance -- even if they don’t live in a high-risk areas.

Flooding from recent rainfall had Virginia State Police, along with South Boston police and Halifax County rescue crews, working to get motorists to safety after they were