Thunderstorms prompt tornado warning on Cape Cod and knock out power across Mass.

The National Weather Service is warning of scattered thunderstorms and rainfall that have carried from Monday night into Tuesday morning and may produce strong, gusty winds and flooding.

The storms prompted the weather service to declare a tornado warning Monday from around 10 p.m. to 11 p.m. for part of Cape Cod and as of 4:30 a.m. Tuesday more than 2,000 customers across the state were without power in the storms’ wake.

The weather service also issued early Tuesday a flash flood watch for much of southeastern Massachusetts and Rhode Island, including the Cape and Islands. The watch is in effect until 2 p.m. and forecasters warn that localized pockets of heavy rain present a flood threat “especially in urbanized centers.”


Monday’s tornado warnings ended as the storms moved offshore, according to the Massachusetts Emergency Management Agency.

The weather service warning had included North Falmouth, East Sandwich, Osterville, and South Yarmouth, the agency said in a Twitter post.

The weather service issued an initial warning up to 10:45 p.m. before extending it until 11 p.m. for Harwich, Dennis, Brewster, and Orleans.

At 10:28, a severe thunderstorm capable of producing a tornado was located over Orleans moving northeast at 40 miles per hour, forecasters said.

West Dennis had reported a wind gust of 50 miles per hour at 10:18 p.m.

John Hilliard can be reached at john.hilliard@globe.com.