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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

A line on a weather map connecting points of equal atmospheric pressure, used to identify high and low-pressure systems.

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

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

Condensation pressure deficit refers to the difference between the actual vapor pressure and the saturation vapor pressure...

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

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...

A strong, downward wind caused by a localized column of air sinking rapidly, often resulting in damage similar to that caused...

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

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

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