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Ch 13...
Humitidy | The amount of water vapor in a given amount of air. |
Relative Humidity | The percentage of water vaper in the air compared to the maximum amount of water vapor that air can contain at a particular temperature. |
Psychrometer | An instrument used to measure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer. |
Condensation | The process by which molecules of water vapor in the air become liquid water. |
Dew point | The temperature at which condensation begins. |
Cirrus | Wispy,feathery clouds made mostly of ice crystals that form at high levels. |
Cumulus | Fluffy, white clouds, usually with flat bottoms that look like rounded piles of cotton. |
Stratus | Clouds that form in flat layers and often cover much of the sky. |
Air Mass | A huge body of air that has similar temperature, humidity, and air pressure throught. |
Tropical | A warm air mass that forms in the tropics and has low air pressure. |
Polar | A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure. |
Maritime | A humid air mass that forms over oceans. |
Continental | A dry air mass that forms over land. |
Front | The boundary where unlike air masses meet but do not mix. |
Occluded | Cut off, as in a front where warm air mass is caught between two cooler air masses. |
Cyclone | A swirling center of low air pressure. |
Anticyclone | A high-pressure center of dry air. |
Storm | A violet disturbance in the atmosphere. |
Thunderstorm | A small storm often accompanied by heavy precipitation and frequent thunder and lighting. |
Hurricane | A tropical storm that has winds of about 119 kilomiters per hour or higher. |
Storm Surge | A dome of water that sweeps across the coast where a hurricane lands. |
Meteorologist | A scientist who studies the causes of weather and tries to predict it. |
Isobar | A line on a weather map that joins places that have the same air pressure. |
Isotherm | A line on a weather map that joins places that have the same temperature. |