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

A large body of air having similar horizontal temperature and moisture characteristics.

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

Bright and dark rays with changing colors and contrast in the sky. These rays become visible due to the reflection of atmospheric...

The reflectance rate of a surface, indicating the amount of electromagnetic radiation reflected from the surface. It depends...

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

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

An instrument for measuring atmospheric pressure.

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

A middle cloud type within the B family in the international cloud classification. These are shaded clouds that can be white...

Convection is the vertical movement of air caused by temperature differences, where warm air rises and cool air sinks. It...