Aviation incident OPS14IA007

The air traffic controller’s failure to provide required advisories about significant radar-observed convective precipitation along both airplanes’ flight routes and the air route traffic control center’s lack of a program to ensure that air traffic controllers provide this required information to pilots, which led to both airplanes encountering severe turbulence. Contributing to the airplanes’ encounters with severe turbulence was the flight crews’ failure to detect the precipitation using on-board radar and request deviations, as necessary, to avoid the hazard.