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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 percentage of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature.

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

An image on the weather radar that is convex to the direction of movement and resembles an arc shape, caused by mesoscale...

A cloud of irregular appearance, composed of irregular cloud fragments.

Nor'easter is a meteorological event commonly observed in the Northeastern United States and typically occurs during the...

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

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

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

A thick cloud of tiny water droplets suspended in the atmosphere near the Earth's surface, significantly reducing visibility.

The term 'cloudy' refers to weather conditions characterized by a significant amount of cloud cover in the sky. This may...