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

A long, narrow region in the atmosphere that transport water vapor, like a river in the sky.

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

A cold front is the leading edge of a cold air mass that replaces a warmer air mass. It is typically associated with sudden...

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

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

Nimbostratus clouds are thick, dark, gray clouds associated with rainy and gloomy days that block the Sun. These clouds,...

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

The term used for turbulence occurring in the absence of clouds or cloud-like elements in the visible area. It is often observed...

A thermodynamic change process in the system without any exchange of heat or transfer of energy between systems. This process...