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

Large, fluffy white clouds with flat bases, typically indicating fair weather, though they can develop into storm clouds...

A tropical cyclone, also called a hurricane, is a severe tropical storm with wind speeds in excess of 74 mph. Known as a...

Confluence refers to the area where two or more air streams or bodies of water meet and combine. In meteorology, it often...

Cloud condensation nuclei are tiny particles in the atmosphere, such as dust, salt, or pollutants, that provide surfaces...

The formation of ice crystals on surfaces when the temperature drops below freezing, typically overnight, causing potential...

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

Weather conditions are the components that comprise the state of the atmosphere. The six main weather conditions are temperature,...

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

The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.