What is Air Mass?

The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

The upward movement of air caused by a topographic barrier, such as a mountain, which can lead to cloud formation and precipitation.

A mass of very cold, dry air that mostly originates over the Arctic Ocean.