When an aircraft hits turbulence the occupants can feel as if the plane is suddenly bumping up and down. Depending on how severe it is, turbulence can be barely noticeable or cause dramatic movement.

The flight attendants have dimmed the lights, you ... turbulence reading and conditions at take-off and landing. For nervous flyers, the question is whether turbulence can bring a plane down.

This could mean you come across unexpected turbulence. Read the full interview with Professor Williams below: "The first flight each day on a particular route tends to be particularly turbulent ...

This could mean you come across unexpected turbulence. Read the full interview with Professor Williams below: "The first flight each day on a particular route tends to be particularly turbulent ...