A Flash Flood Warning was issued for several cities and towns south of Boston Thursday morning as heavy rain brought traffic to a crawl and clogged streets and highways.With raining come down so fast,

The warning is in effect until 9 a.m. for Boston and several communities south of the city, according to the National Weather Service.

On Thursday at 6:01 a.m. the National Weather Service released a flash flood warning in effect until 9 a.m. for Bristol, Middlesex, Norfolk, Plymouth, Suffolk and Worcester counties.