FAA Ground School Practice Test

A temperature inversion most likely results in what kind of weather condition?

1. A decrease in temperature as altitude increases

2. An increase in temperature as altitude is increased

3. Constant temperature at all altitudes

4. Unstable weather conditions

The correct answer is: An increase in temperature as altitude is increased

A temperature inversion occurs when warmer air overlays cooler air at the surface, causing an increase in temperature with altitude. This condition is contrary to the typical pattern of the atmosphere where temperature tends to decrease with height. As a result of this inversion, the stable layer of warm air prevents vertical mixing, often resulting in stagnant air and increased potential for air pollution. Under these conditions, when the typical lapse rate is inverted, it frequently leads to stable weather conditions. The warm air acts as a cap, suppressing convection and often resulting in fog, low clouds, or haze rather than unstable weather patterns that promote vigorous vertical motion. Therefore, the presence of an inversion is characterized by a situation where temperature increases with altitude, confirming that the correct answer reflects this key atmospheric phenomenon.