Severe Thunderstorms to Follow Extended Mid-Atlantic Heat Wave

A weeklong heat wave that has baked the Mid-Atlantic region from Washington to New York City will be followed late Sunday by more forecasts of extreme weather, including severe thunderstorms and possible tornadoes.

Tornado watches have been posted until 8 p.m. Eastern time across upstate New York to Maine, including a large part of heavily populated suburban Boston, the National Weather Service said.

“A few tornadoes are likely,” the US Storm Prediction Center said. In addition, damaging winds as fast as 70 miles (113 kilometers) per hour are likely, along with scattered large hail of as much as 1.5 inches ...