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

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...

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

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

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

The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....

A narrow band of strong winds in the upper atmosphere, typically flowing from west to east and influencing weather patterns.

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...