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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 heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...

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

Condensation is the process by which water vapor in the air cools and changes into liquid water. This process is crucial...

Coastal flooding occurs when water from the ocean, sea, or large lakes inundates land areas along the coast, usually due...

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

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

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

Although it is also used for light winds, it is the general name given to the daily cyclical winds that occur mostly between...

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....