Life threatening thunderstorms known as derecho, are expected to sweep across teh East and the Ohio Valley Thursday evening. They bring a potential for widespread damaging winds, hail and tornadoes.
A derecho, which is a long-lived line of thunderstorms with prolific damaging winds, will continue to fly eastward and impact New York City, Newark, Atlantic City, Philadelphia, Dover, and Baltimore by 9 PM EDT. Winds could approach 80 MPH in some locations, causing widespread power outages and downing thousands of trees. This line of storms could produce tornado-like damage over large areas.