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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

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

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

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

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

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

The mass of air surrounding the earth and bound to it more or less permanently by the earth's gravitational attraction.

The term used for semi-stationary high-pressure centers such as the Azores and North Pacific Highs, which occur in the narrow...

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

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

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