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

The amount of water vapor present in the air, which can affect comfort levels and weather conditions.

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

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

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

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

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

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

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

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