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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

The situation where there is no advection because the constant pressure surfaces and temperature surfaces in the atmosphere...

Occurs when centers of high pressure and/or low pressure set up over a region in such a way that they prevent other weather...

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

A line of severe thunderstorms that can form along or ahead of a cold front, often producing strong winds and heavy rain.

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

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

Indicates the amount of water the soil can absorb/retain through percolation. This capacity is around 7% in sandy soil and...

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

A periodic cooling of sea surface temperatures in the central and eastern Pacific Ocean, often leading to altered global...

An anvil is a cloud mostly composed of ice particles. Otherwise known as a cumulonimbus cloud, an anvil has reached the stratospheric...