What is the turbulence intensity that causes slight, erratic changes in altitude?

The correct answer identifies the turbulence intensity as light. Light turbulence is characterized by slight, erratic changes in altitude, which can be felt as minor shifts in the aircraft's position. This type of turbulence might cause some discomfort for passengers, but it usually does not affect the flight's overall safety or control. Pilots typically will not need to make any significant adjustments while flying through light turbulence, but they may advise passengers to remain seated with their seatbelts fastened.

Other turbulence intensities may create more significant challenges; for instance, moderate turbulence can lead to a more noticeable bumpiness in flight, affecting both altitude and attitude, whereas severe turbulence can cause large, abrupt changes in altitude and may require pilots to take corrective action. Extreme turbulence is characterized by violent changes in altitude and attitude that can cause structural damage to the aircraft. Understanding these distinctions helps air traffic controllers and pilots assess and communicate the potential challenges during flight.