The part of the Earth's system made of the mixture of gases that surrounds Earth.

A set of atmospheric conditions that can injure or kill people or cause major property damage.

A scientist who observes and forecasts weather.

A measure of the average movement of particles of matter.

The measure of the amount of water vapor in the air compared to the maximum amount of that air can hold at a particular temperature; given as a percentage between 0% and 100%.

Water that falls to the ground as rain, snow, sleet, or hail.

An instrument used to measure air pressure.

An instrument used to measure wind speed.

A tool used to measure precipitation.

A tool used for measuring wind direction.

The movement of air.

The normal weather conditions of a region, throughout the year, averaged over a series of years.

To predict.

A scientist who studies the world's weather patterns.

A measure of the force that air exerts on each square inch of a surface.