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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 large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...

Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

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

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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

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

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