Title: Define Instrument Meteorological Conditions (IMC) and Visual Meteorological Conditions (VMC).
Course: Air Traffic Controller (20999) > Section: Understanding Meteorology

Definition of Instrument Meteorological Conditions (IMC) should include the concept that IMC is a category that describes weather conditions during which visibility is less than three miles and ceiling is less than 1000 feet.

Definition of Visual Meteorological Conditions (VMC) should include the concept that VMC is a category that describes weather conditions during which visibility is better than three miles and ceiling is more than 1000 feet.

Process/Skill Questions:

- How are IMC and VMC the same and different?
- To what does the term ceiling refer?