Shared Flashcard Set

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Weather
Flash Cards for Mr. Ullrich's Weater Test
22
Science
8th Grade
03/03/2009

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Cards

Term
Air Mass
Definition
A large body of air in the troposphere with similar characteristics of pressure, moisture and temperature
Term
Gradient
Definition
The rate of change from place to place within a field; also known as slope
Term
Dew Point
Definition
The temperature at which the air becomes saturated with water vapor and the relative humidity is 100%; at temperature below the dew point , condensation and sublimation occurs
Term
Humidity
Definition
The greatest amount of water vapor the air can hold at the time
Term
Isobar
Definition
An isoline used on weather and climate maps that connect points of equal air pressure
Term
Jet Stream
Definition
a concentrated curving band of high speed, easterly moving winds usually at the top of the earth's troposphere
Term
Psychrometer
Definition
An instrument that is used to indirectly measure the amount of water vapor in air, such as a sling psychrometer; with the use of data tables, temperature readings from a psychrometer can be used to determine relative humidity and dew point
Term
Occluded Front
Definition
the boundary of opposing wedges of cold air masses formed when a cold front overtakes a warm front, lifting the warm air mass from the Earth's surface, forming mid latitude cyclones (low)
Term
Anemometer
Definition
A weather instrument used to measure wind speed
Term
Atmospheric/Air/Barometric Pressure
Definition
the weight of overlying atmosphere pushing down on a given mount of area; affected be changes in temperature, humidity and altitude
Term
Barometer
Definition
An instrument used to measure air pressure
Term
Cloud Cover
Definition
The percent/fraction of the sky that that is covered by clouds
Term
Cold Front
Definition
The boundary of an advancing cold air mass and warmer air mass, where underlying cold air pushes forward like a wedge; characterized by a steep slope, rapid changes in weather, thunder storms and sometimes hail or tornadoes
Term
Cyclone
Definition
A low-pressure system that has air moving towards its center, rotates counterclockwise in the Northern Hemisphere, usually cause bad weather includes hurricanes and tornadoes
Term
Isotherm
Definition
an isoline used on weather and climatic maps to connect points of equal air temperature
Term
Precipitation
Definition
Falling liquid or solid water water falling from clouds toward Earth's surface
Term
Relative Humidity
Definition
The ratio of the amount of water vapor in the air to the maximum amount it can cold hold: often expressed as a percent
Term
Stationary Front
Definition
A weather condition in which the boundary between two air masses remains the same
Term
Station Model
Definition
Cities and other weather station sites on weather maps represented by circles, with symbols in and around each circle that indicate the many weather variables
Term
Visibility
Definition
The farthest distance at which one can see a prominent object at Earth's Surface with the naked eye; decreased by by fog, air pollution, and precipitation
Term
Water Vapor
Definition
Gaseous water in the atmosphere
Term
Convergence Zone
Definition
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