Dark blue cloudy sky

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 narrow band of strong winds in the upper atmosphere, typically flowing from west to east and influencing weather patterns.

A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...

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

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

An instrument for measuring atmospheric pressure.

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

Considerable cloudiness refers to weather conditions where a large portion of the sky is covered with clouds, but some clear...

Conduction is the transfer of heat or electricity through a material without the material itself moving. This occurs when...

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