LX March 31, 2020 4:42 pm The Emergency Alert System: Everything You Need to Know We’ve all heard it: the Emergency Alert System. That loud sound signifying a national emergency. But who decided to use that sound? And is it designed to be that annoying? US & World Videos 1:40 Nighttime forecast for May 4 0:58 Mystik Dan wins 150th Kentucky Derby in photo finish 2:38 Met Gala couples over the years: Priyanka Chopra & Nick Jonas & more 2:45 Crews use shears to break apart bridge on I-95 in Norwalk 4:14 Shrimp hush puppy fritters with Creole Comeback Sauce and bacon-wrapped jerk plantains