A huge body of air that has similar temperature, air pressure throughout, and humidity
Wispy, feathery clouds made mostly of ice crystals that form at high levels.
A swirling center of low air pressure.
Fluffy, white clouds, usually with flat bottoms, that look like rounded piles of cotton.
The temperature at which condensation begins.
The process by which water molecules in liquid water escape into the air as water vapor.
The amount of water vapor in a given volume of air.
The boundary where unlike air masses meet do not mix.
The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature.
The average, year after year conditions of temperature, precipitation, winds and clouds in an area.
A climate event that occurs every two to seven years in the Pacific Ocean, during which winds shift and push warm water toward the coast of South America.
An arid region that on average recieves less than 25 centimeters of rain a year.
A line on a weather map that joins places that have the same air pressure.
A line on a weather map that joins places that have the same temperature.
Time in the past when continental glaciers covered large parts of Earth's surface.
The process by which molecules of water vapor in the air become liquid water.
A tropical storm that has winds about 119 kilometers per hour or higher.
Clouds that form in flat layers & often cover much of the sky.
Any form of water that falls from clouds & reaches Earth's surface.
An instrument used to measure relative humidity, consisting of a wet - bulb thermometer and a dry - bulb thermometer.
The continual movement of a water amoung Earth's atmosphere, oceans & land surface through evaporation, condensation, & precipitation.
A violent disturbance in the atmosphere.
A small storm often accompainied by heavy precipitation and frequent thunder and lightning.
A sudden spark or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground.
A rapidly, whirling, funnel - shaped cloud that reaches down from a storm cloud to touch Earth's surface.
A scientist who studies the causes of weather and tries to predict it.
A climate event in the eastern Pacific ocean in which surface waters are colder than normal.
A large area of reduced ozone concentration in the stratosphere, gound over Antartica.
Permanently frozen soil found in the tundra climate region.
The areas near both poles, from about 66.5° to 90° north and 66.5° to 90° south latitudes.
A forest in the tropical wet climate zone in which large ammounts of rain fall year round.
A tropical grassland with scattered clumps of trees.
A "dome" of water that sweeps across the coast where a hurricane lands.
The areas between the tropical and the polar zones, from about 23.5° to 66.5° north & 23.5° to 66.5° south latitude.
The area near the equator, between about 23.5° north latitude and 23.5° south latitude.
A polar climate region found across northern Alaska, Canada, and Russia, with short cool summers and bitterly cold winters.