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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

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

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

The percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

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

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...

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