Dark blue cloudy sky

What is Lightning?

A sudden electrostatic discharge during a thunderstorm between electrically charged regions of a cloud, between clouds, or between a cloud and the ground.

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Glossary

A measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...

Snow that rises to 8 feet or higher.

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....