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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 names given to the winds blowing from the four cardinal directions (north, east, south, and west - N, E, S, W) on a compass.

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

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

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

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

A rapidly rotating column of air extending from a thunderstorm to the ground, capable of causing significant damage.

A deviation from the normal or expected value in atmospheric or climatic conditions, often used in meteorology to identify...

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

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

The amount of radiation, heat, or light passing through or flowing from a unit area of a surface.