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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

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

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

A cold core high is a high-pressure system with cold air at its center. These systems are typically associated with clear...

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

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...

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

A strong wind typically ranging from 34 to 40 knots (39 to 46 miles per hour) and often associated with rough seas and stormy...

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

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