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 middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

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

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...

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

Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy...

A cloud of irregular appearance, composed of irregular cloud fragments.

A periodic warming of sea surface temperatures in the central and eastern Pacific Ocean, significantly influencing global...