What does "IMC" stand for in aviation?

"IMC" stands for Instrument Meteorological Conditions. This terminology is vital in aviation as it refers to weather conditions that require pilots to fly using instruments rather than relying on outside visual references. Under IMC, visibility is typically reduced due to factors such as clouds, fog, or heavy precipitation, necessitating the use of instrument approaches, navigation, and flight procedures.

Understanding IMC is crucial for pilots since flying in such conditions demands proficiency with instruments and knowledge of procedures to ensure safe operations. Knowledge of IMC helps pilots prepare for adverse weather and maintain safety standards in their navigation and communication with air traffic control. This concept is contrasted with VFR (Visual Flight Rules), where pilots fly with more reliance on visual observations.