FAA Commercial Pilot Airplane (CAX)WeatherMedium
A pilot is flying at 10,000 feet MSL and notices a sudden, significant increase in outside air temperature, accompanied by a smooth, stable ride. What atmospheric phenomenon is likely being encountered?
- AA squall line.
- BA temperature inversion.
- CA cold front.
- DClear air turbulence.
Show answer & explanationAnswer & explanation
Correct answer: B. A temperature inversion.
A temperature inversion is a layer in the atmosphere where temperature increases with altitude, contrary to the typical decrease. This condition often leads to very stable air, which can be perceived as a smooth ride, and a noticeable temperature increase when climbing into or descending through the inversion layer.
Why the other options are wrong
- A. Incorrect. A squall line is a line of severe thunderstorms, which would involve significant turbulence and temperature fluctuations, not a smooth ride.
- C. Incorrect. A cold front typically brings a *decrease* in temperature and often unstable, turbulent conditions.
- D. Incorrect. Clear air turbulence (CAT) is turbulence, not a smooth ride, and while temperature changes can occur with CAT, a significant *increase* in temperature coupled with stability points specifically to an inversion.
Temperature Inversion
A temperature inversion is an atmospheric phenomenon where the air temperature increases with increasing altitude, rather than decreasing as is typical. This condition often results in stable air, poor visibility, and can trap pollutants.
- Temperature increases with altitude.
- Creates very stable atmospheric conditions.
- Can lead to reduced visibility (fog, haze).
- Common during clear, calm nights (radiation inversions) or frontal activity.
Memory trick: Inversion: Inverted Temp, Incredibly Stable.