In meteorology, temperature inversions occur in the layer of the atmosphere closest to the Earth's surface, known as the troposphere. Temperature inversions in the atmosphere occur when a cool layer of air close to the Earth's surface is covered by a warm layer above.
Under normal conditions, the temperature of the air in the atmosphere lowers with altitude. When a temperature inversion occurs, the temperature rises with altitude. There are four types of temperature inversions: ground inversions, turbulent inversions, subsidence inversions and frontal inversions. These temperature inversions in the troposphere greatly affect precipitation, visibility and cloud formation near the Earth's surface.