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ES Topic 7

Weather

QuestionAnswer
Air mass A larger body body of air in the troposphere with similar characteristics of pressure, moisture, and temperature
Air pressure gradient the difference in air pressure for a specific distance
anemometer device used to measure wind speed
Atmospheric (barometric) pressure the pressure due to the weight of the overlying atmosphere pushing down on any given area
barometer device used to measure air pressure
Cloud cover The fraction of percent of the total sky at a location that is covered by clouds; usually expressed in tenths
Cold front The boundary of an advancing cold air mass and a warmer air mass, where the underlying cold air pushes forward like a wedge; characterized by a steep
cyclone a low pressure portion of the troposphere that has air moving towards its center, usually rotates counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere; includes hurricanes, tornadoes, and mid-latitudes, also called a low
Dew point the temperature at which air is filled with water vapor
front where two air masses of different characteristics meet, an interface, or boundary
humidity a general term that refers to the water vapor content of the atmosphere
isobar air pressure is often shown on weather maps by the use of isolines
Jet stream bands of easterly moving air at the top of the troposphere
monsoon regular and extreme weather changes caused by the shifting wind and pressure belts
Occluded front the boundary of opposing wedges of cold air masses formed when a cold front overtakes a warm front, lifting the warm air mass off the ground
Planetary wind belt East-West zones on Earth where the wind blows from one direction much of the time
Polar front an ever changing boundary in the middle latitudes between the colder air masses toward the poles and the warmer air masses toward the equator
precipitation falling liquid or solid of water from clouds toward Earth’s surface
probability chance or likelihood of something happening.
psychrometer an instrument that is used to indirectly measure the amount of water vapor in the air, such as a sling psychrometer
radar stands for RAdio Detection And Ranging instrument-reflects radio electromagnetic energy off the aerosols of precipitation and clouds
Relative humidity the ratio of the amount of water vapor in the air to the maximum amount it can hold
Stationary front a weather condition in which the boundary between two air masses remains in the same position
Station model indicates a site’s weather variables for a specific time of day
troposphere the part of the atmosphere imediately above the Earth’s surface; where most weather changes occur
visibility the furthest distanceat which one can see a pominant object at Earth’s surface with the naked eye.
Warm front the boundary of an advancing warm air mass and a retreating wedge of a cooler air mass
Water vapor gaseous water in the atmosphere
Weather variables condition of the atmosphere such as temperature, air pressure, wind, moisture, cloud cover, precipitation, and storms
Tornado a rapidly rotating, extremely low-pressure funnel that hangs down from thunderstorm clouds towards earth’s surface
Thunder storm heavy rainstorm accompanied by thunder and lightning from thunderstorm type clouds
blizzard a storm with winds of 35 miles an hour or greater associated with considerable amounts of falling and/or blowing snow
Created by: etucci