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

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

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

The decrease in temperature with height in an adiabatically rising air parcel (lapse rate). For dry air, this value is 1...

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

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

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

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

A type of cloud consisting mostly of small particles such as ice particles.

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

A body that has the property of absorbing all electromagnetic radiation falling on it, and therefore is the theoretical body...