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What is Warning?

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening now, developing as we speak, and is minutes away. This weather hazard poses a threat to life and property.

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Glossary

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

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

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

The large-scale movement of air that distributes heat and moisture around the Earth, influencing weather patterns and climatic...

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 formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

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

Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...

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

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