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

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

An instrument for measuring atmospheric pressure.

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

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

Weather is the day-to-day meteorological conditions that happen in our atmosphere. Weather can change within minutes, which...

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

A fixed potential temperature line on adiabats, or the process of thermodynamic changes within a system without any exchange...

Jet streams are strong, fast-flowing air currents in the upper levels of the atmosphere. They form when warm air masses meet...

A cold core low is a low-pressure system where the coldest temperatures are found near the center. These systems are often...