What is Supercell?

A large, organized thunderstorm with a rotating updraft, often producing severe weather such as tornadoes, hail, and heavy rain.

Glossary

An instrument that continuously records atmospheric pressure over time. It uses a barometer to measure pressure and creates...

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

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

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

A weather warning means that a weather hazard is occurring, imminent, or likely. In other words, severe weather is happening...

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.

Local winds that blow from slopes to peaks as a result of the heating of the top slopes without being affected by general...

An elongated area of relatively low atmospheric pressure, often associated with unsettled weather conditions like storms...

Ball lightning appears during thunderstorms, taking the shape of glowing, electric orbs in the sky. It can appear in a variety...

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