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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

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

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

Thermodynamic changes occurring within a system without any exchange of heat with the surroundings. In the atmosphere, changes...

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

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

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...

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

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 instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....