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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 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.

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

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...

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

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

A low-pressure area with converging winds, rotating counterclockwise in the Northern Hemisphere and clockwise in the Southern...

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

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