For the third time in eight days, the National Weather Service is predicting a rough day and night for Belmont and eastern Massachusetts, especially between 4 p.m. and midnight.
Despite cloud cover this morning, partial sunshine is expected to break through in the early afternoon, allowing for an unstable atmosphere, which will help build for multiple rounds of thunderstorms, the NWS said.
The region can expect thunderstorms later today, with some being severe, producing heavy downpours, with two to four inches of rain possible in these storms.
The NWS says this could result in flooding.
The first watch has just been issued for flash flooding. The flash flood watch will go into effect at 4 p.m.
A flash flood watch means conditions may develop that lead to flash flooding.
The NWS says isolated tornadoes are also possible today but the greatest risk for these storms is in western Massachusetts.
Last Wednesday, three heavy downpours in 90 minutes caused isolated flooding in Belmont including in the roadway under the commuter rail bridge. On Tuesday, threatening clouds passed by Belmont only to cause flooding on the South Shore.