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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

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

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

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

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

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

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

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

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...

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

A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus...