What turbulence level is indicated when drinks are starting to splash out of cups in the galley?

When drinks start to splash out of cups in the galley, it indicates a moderate level of turbulence. This level of turbulence is characterized by more noticeable and continuous movement, enough to disturb liquids but not to the point where it causes widespread difficulty in maintaining control or a high level of danger.

Moderate turbulence typically involves certain discomfort for passengers and crew, where loose objects might be displaced, and service may be interrupted, even though the aircraft is still generally manageable. The physical sensations felt during this type of turbulence are stronger than light turbulence, which generally does not affect objects in a significant way.

In contrast, severe turbulence would cause a drastic and sudden loss of altitude or attitude control, and extreme turbulence would be catastrophic, leading to potential structural damage. Light turbulence is characterized by minor movements where the effects on passengers and crew are minimal. Thus, the behavior of drinks splashing in cups aligns precisely with the indicators of moderate turbulence.