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

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

Cloud or rain droplets containing pollutants, such as oxides of sulfur and nitrogen, to make them acidic.

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

The temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid form, leading...

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

The trapping of heat in the Earth's atmosphere due to greenhouse gases, such as carbon dioxide and methane, which allows...

A narrow band of strong winds in the upper atmosphere, typically flowing from west to east and influencing weather patterns.

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

A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...