Dark blue cloudy sky

What is Relative Humidity?

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

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Glossary

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

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

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

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

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.

The scientific study of climate, focusing on the analysis of long-term weather patterns and trends over time.

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