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Rain moves in; Flash flooding possible

A flash flood watch went into effect in the overnight hours, the National Weather Service said, and the rain will likely continue through the day, potentially causing flooding in urban areas and areas with poor drainage.

The flash flood watch is in effect from 2 a.m. until 8 p.m. Wednesday.

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“The best chance for the heaviest showers [is] by late afternoon,” said National Weather Service meteorologist Bill Simpson. “Most areas, it’ll be fine, much-needed rain. But if it rains really hard in a short period of time,” flash flooding is possible. “You want to emphasize possible torrential downpours,” he said.

Thunderstorms are also possible, Simpson said. But forecasters say the chances of a tornado are less than they thought on Monday. “I think more likely that threat will shift down to the New York area,” he said.

Simpson said the showers will “gradually taper off after sunset” in Western Massachusetts, and should end after midnight in the Boston area.

By Thursday, the precipitation should leave the region, the weather service said. Sun and temperatures in the mid-70s are expected Thursday through the weekend, before a slight chance of showers arrives on Sunday.

“We’re lucking out here,” Simpson said.

Kiera Blessing can be reached at kiera.blessing@globe.com.
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