The recent dry, sunny weather will end late Tuesday night, with torrents of heavy rain that could come down in some areas at a rate of more than 2 inches per hour, the National Weather Service said.
There is even a chance of an isolated brief tornado.
The rain is expected to spread over the region from west to east Tuesday night, intensifying Tuesday might into Wednesday. Thunderstorms may be embedded in the rain, the forecasters said.
Issuing a flash flood watch for Western and Central Massachusetts, the forecasters warned that urban and small stream flooding were possible. The watch is effective from just after midnight Wednesday morning until 6 p.m. Wednesday.
In Eastern Massachusetts, a flash flood watch has not yet been posted but forecasters warned of heavy rain and an “isolated risk for severe weather” including a “low probability for a brief tornado.”
Widespread amounts of 1 to 3 inches of rain are expected, but some areas could get 3 to 5 inches, the forecasters said.
Along the coast, there is a risk of minor coastal flooding along shorelines that face south and east, due to high winds and especially high astronomical tides. Ocean beaches may also be pounded by high surf.
Highs on Tuesday will reach the upper 70s to around 80 in most places, with sunshine in the morning before the clouds roll in from east to west. On Wednesday, while the rain falls, temperatures are expected to be in the mid- to upper 70s.
By Thursday, sunshine will return along with cool, comfortable temperatures in the mid-70s. This weather is expected to persist and get gradually warmer into the weekend, the weather service said.
The state was hit by two tornadoes in late July.
A tornado with winds up to 120 miles per hour sliced through Revere’s central business district on July 28, damaging more than 100 homes. It cut a path of destruction nearly a half-mile wide and 2 miles long. No one was seriously injured.
A day earlier, a small tornado with estimated maximum winds of 90 miles per hour whipped through the Western Massachusetts town of Dalton. It was about 20 yards wide and traveled a quarter-mile. No one was injured.Kiera Blessing can be reached at firstname.lastname@example.org.