What do VMC and IMC stand for in meteorological terms?

What do VMC and IMC stand for in meteorological terms?

• A. VMC = Visual Meteorological Conditions; IMC = Instrument Meteorological Conditions.
• B. VMC = Visual Meteorological Conditions; IMC = Irregular Meteorological Conditions.
• C. VMC = Verbal Meteorological Conditions; IMC = Instrument Meteorological Conditions.
• D. VMC = Visual Meteorological Conditions; IMC = Internal Meteorological Conditions.

Answer: (A)

Visual meteorological conditions describe weather that allows flight with visual reference to the surface, meaning the pilot can operate under VFR with enough visibility and cloud clearance to navigate by sight. Instrument meteorological conditions occur when the weather is not good enough for VFR, so pilots must fly by reference to instruments and follow IFR procedures. The other terms listed aren’t used in aviation meteorology for this purpose—terms like irregular, verbal, or internal meteorological conditions don’t represent the standard VFR/IFR distinction.

Visual meteorological conditions describe weather that allows flight with visual reference to the surface, meaning the pilot can operate under VFR with enough visibility and cloud clearance to navigate by sight. Instrument meteorological conditions occur when the weather is not good enough for VFR, so pilots must fly by reference to instruments and follow IFR procedures.

The other terms listed aren’t used in aviation meteorology for this purpose—terms like irregular, verbal, or internal meteorological conditions don’t represent the standard VFR/IFR distinction.