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 cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...

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

A tropical cyclone with sustained winds of at least 74 miles per hour, characterized by a central eye, strong winds, and...

A very cold high pressure that originates over the Arctic Ocean.

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

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....

A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.

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

The horizontal transport of any feature within the atmosphere due to the movement of air (wind). This includes phenomena...