Maps: Severe thunderstorm watch issued for Mass.

A woman used an umbrella to protect herself from the rain on the Harborwalk in the Seaport District of Boston. Craig F. Walker/Globe Staff

A severe thunderstorm watch has been issued for Massachusetts, with lightning, damaging wind gusts, and street flooding possible across the state, forecasters said.

The thunderstorm watch remains in effect until 10 p.m.

Some areas of the state, including Greenfield and Fitchburg, were under a severe thunderstorm warning, meaning a severe storm is happening or imminent, according to the National Weather Service.

This map shows the advisories in effect as of 4:40 p.m. on Wednesday. National Weather Service

Most of the state, including Boston, was under “significant” risk for thunderstorms Wednesday afternoon, according to the weather service. The south shore was under “elevated risk,” while Cape Cod and the islands were under “limited risk.” .

This map shows the thunderstorm risk for Wednesday. National Weather Service

At 4:30 p.m., the storms were moving across western Massachusetts, bringing “lots of lightning,” the weather service said on Twitter.

Here’s a snapshot of the radar in the Northeast as of about 5 p.m.

A look at the radar as of about 3 p.m. Wednesday. National Weather Service


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