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

A weather watch means there is a risk of weather hazards in the near future, which could pose a threat to life/property....

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

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

The formation of fog when warm and moist air passes over a cool or cold surface or, conversely, when cold air passes over...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.

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

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

A sudden and rapid flow of snow masses accumulated on the slopes of mountainous areas under the influence of gravity or a...