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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 weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

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 measure of how hot it feels when relative humidity is combined with the actual air temperature, often referred to as the...

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

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

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

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

An instrument used to measure the speed, force, and sometimes the direction of the wind. It can be cup or pressure tube anemometers....

In a severe storm, with a swirling motion in its left rear quadrant, a vertically rotating column of air, often seen with...

The heating of the Earth by the sun causes daily changes in both the direction and speed of the wind. During the day, ground...