Dark blue cloudy sky

What is Hail?

Precipitation in the form of small balls or lumps of ice that form in thunderstorm updrafts and fall to the ground.

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Glossary

Particles such as pollen, grass seeds, or dust in the air that cause allergies and are transported by winds.

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

A storm characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder.

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

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

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

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

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

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe...

The expected rate of temperature decrease in an adiabatically rising air parcel when there is no heat exchange with the environment....