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

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.

The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

A middle cloud type within the B family in the international cloud classification. These clouds consist of water droplets...

A cloud of irregular appearance, composed of irregular cloud fragments.

Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...

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

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

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

An instrument for measuring atmospheric pressure.