Areas along the Interstate 95 corridor from Philadelphia to New York will be at risk for severe thunderstorms into this today.
Some of the thunderstorms will produce flash flooding, besides damaging winds and hail.Three people were killed in Pittsburgh, Pa. when flash floods submerged their cars in water.
Severe thunderstorms were already popping up early this afternoon from central Pennsylvania to central New York. A few rumbled over AccuWeather.com Headquarters in State College, Pa., caused a number of power flickers.
Some thunderstorms have been producing 1-inch-diameter hail, as reported in northeastern Pennsylvania in the town of Towanda.
The thunderstorms are expected to strengthen as they continue developing and heading eastward into this evening. People from eastern Pennsylvania into New Jersey, southeastern New York and far southwestern New England could experience a period of gusty winds, vivid lightning and heavy rain.