What is Air Mass?

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

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

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

Any form of water - liquid or solid - that falls from the atmosphere to the Earth's surface, including rain, snow, sleet,...

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

Ice forms on the surface of highways in a very thin layer that is difficult to distinguish from the color of the asphalt...

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...