Extreme heat, severe thunderstorms and flash-flood risks threaten parts of the U.S. during the Labor Day weekend.

While widespread cool temperatures aren't yet in the forecast, experts say other signs of fall are on the way.

Cleaning crews were hard at work after a tornado ripped through the Sun and Surf Beach Club in Atlantic Beach Thursday evening. NewsdayTV's Andrew Ehinger reports. Credit: Newsday/Howard Schnapp ...