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Weather

The condition of Earth's atmosphere at a particular time and place.

Climate

The average weather conditions in an area over a long period of time

air mass

A huge body of air that has similar temperature, humidity, and air pressure at any given height

Warm Front

the front of an advancing mass of warmer air

Cold Front

A front where cold air moves in under a warm air mass.

Stationary Front

A boundary between air masses that don't move possibly causing rain for several days

Occluded Front

a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow

Isobars

Lines joining places on the map that have the same air pressure

humidity

a measure of the amount of water vapor in the air

Thunderstorm

a usually brief, heavy storm that consists of rain, strong winds, lightning, and thunder

Barometer

an instrument used to measure atmospheric pressure

Anemometer

An instrument used to measure wind speed

relative humidity

The amount of water vapor in the air at any given time is usually less than that required to saturate the air. Expressed as a percentage.

Dew Point

temperature at which air is saturated and condensation forms