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

The measure of the water vapor or moisture content in the air, expressed as the mass of water vapor per unit volume of air....

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

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

Frozen drizzle is a dangerous type of frozen rain. It’s a light rain that falls in very fine drops, which freezes on contact...

A continental air mass is a large body of air that forms over land, characterized by dry conditions due to the lack of moisture...

Anticyclones are areas of high atmospheric pressure that bring hot, dry weather in the summer and cold fronts in the winter.

A closed low, also known as a cut-off low, is a low-pressure system that is entirely isolated from the main atmospheric circulation...

A bomb cyclone is a large mid-latitude storm that forms when a storm’s central pressure drops (i.e. “bombs out”), resulting...

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