Private Pilot Private Exam

What does the suffix "nimbus" used in naming clouds signify?

1. A rain cloud

2. A type of fog

3. A high-altitude cloud

4. A snow-producing cloud

The correct answer is: A rain cloud

The suffix "nimbus" in cloud nomenclature specifically indicates that the cloud type is associated with precipitation, particularly rain. In meteorology, "nimbus" is used to denote clouds that are capable of producing significant rainfall. For instance, the term "cumulonimbus" refers to a type of cloud that is characterized by towering structures and is known for producing thunderstorms and heavy precipitation, while "nimbostratus" indicates a thick, gray cloud layer that typically brings overcast skies and steady rain. The other options represent different meteorological phenomena or cloud types that do not share this characteristic of indicating precipitation. Fog is essentially a cloud at ground level and does not relate to the "nimbus" designation, while high-altitude clouds like cirrus or cirrostratus do not produce precipitation in the same way. Snow-producing clouds, often associated with other terms, may include nimbostratus but aren't defined solely by the "nimbus" suffix. Understanding the role of "nimbus" is fundamental in cloud classification and helps in predicting weather patterns related to precipitation.