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What is Heat Index?

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

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Glossary

A condition in which the stratification of the atmosphere depends on both air temperature and pressure, and where surfaces...

A cloud that develops from Cirrus, completely or partially covering the sky, creating a halo effect, thin, sheet-like, milky...

A polar vortex is a circulating mass of air in the atmosphere, typically found in polar regions. This rotating air mass occurs...

The names given to the winds blowing from the four cardinal directions (north, east, south, and west - N, E, S, W) on a compass.

The occurrence of storms resulting from the horizontal advection of cold air at high levels or the horizontal advection of...

A weather system refers to the movement of warm and cold air across the globe, usually in a recurring pattern. Systems can...

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

A weather front where two air masses meet but neither is strong enough to move the other, often resulting in prolonged periods...

A scale for estimating wind speed based on observed conditions of the sea or land. It ranges from 0 (calm) to 12 (hurricane)...

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