A flash flood watch was issued by the National Weather Service  late Wednesday for much of the region, including Oxford and Franklin counties.

As much as 3 inches of rain could fall in some areas, overwhelming small rivers and streams, said James Brown, a meteorologist with the National Weather Service in Gray.

The watch will continue until midmorning, Brown said.

“It will be over relatively quickly,” he said. While it lasts, downpours could be torrential.

Somerset County and New Hampshire’s Coos and northern Carroll counties were also included in the watch.

Thunderstorms may occur on Thursday afternoon, Brown said. More rain was expected for Friday afternoon as another weather system moves through.

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