What is referred to by cloud etage heights?

Cloud etage heights refer specifically to the different height ranges at which various types of clouds are typically found in the atmosphere. This concept helps meteorologists and pilots understand the vertical distribution of clouds, which can significantly affect weather patterns and flight operations.

Clouds are classified into several types, such as cirrus, cumulus, stratus, and others, and each type usually forms within a specific altitude range. For instance, high clouds like cirrus are found at altitudes above 20,000 feet, while low clouds such as stratus typically form below 6,500 feet. Understanding these height ranges is crucial for forecasters as it assists in predicting weather conditions, especially regarding precipitation, turbulence, and visibility.

The incorrect options address different aspects of cloud formation and effects but do not pertain to the classification of cloud heights. For example, minimum temperatures for cloud formation deal with the thermodynamic aspects of cloud creation, while the rate of cloud formation concerns the dynamics of how quickly clouds develop. Similarly, visibility reduction due to cloud cover refers to the effects of clouds on sightlines, which is a separate concern from their altitude classifications. Hence, the focus on height ranges and types aligns closely with the definition of cloud etage heights.