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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

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

A small, intense downdraft that produces damaging winds at the surface, typically lasting a few minutes and often associated...

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 situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...

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

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

The process by which a solid changes directly into a gas without first becoming a liquid, such as ice turning into water...

A type of cloud consisting mostly of small particles such as ice particles.

Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...

A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...