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8ES Chp 19:Weather

8th Grade Earth Science Chapter 19: Weather Coach Leach

TermDefinition
Weather The condition of the atmosphere at a given time and place.
Meteorology The scientific study of the atmosphere, including its composition, structure, weather, and alteration.
Atmospheric Pressure The weight of atmospheric gases.
Wind Moving air traveling from regions of high pressure to those of low pressure.
Wind Chill Factor The perceived lowering air temperature as a wind blows over unprotected skin and applies only to people and warm blooded animals.
Precipitation Any form of water that falls to the earth's surface from the sky.
Humidity A measure of the amount of water vapor in the air.
Relative Humidity The ratio of the amount of water vapor in the air to the maximum that could be vaporized at the current temperature.
Pressure Gradient The rate of change of atmospheric pressure with horizontal distance.
Cyclone The low pressure weather system toward which surrounding winds spiral counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
Anticyclone The high pressure weather system from which winds spiral outward in a clockwise direction in the Northern Hemisphere or counterclockwise in the Southern Hemisphere.
Trade Wind A global wind of the low latitudes that flows from the subtropical high toward low pressure centers at the Equator.
Prevailing Westerly A global wind of the mid latitudes that flows from the subtropical high toward the sub polar low while the Coriolis effect turns the winds so that they consistently flow from the southwest to northeast in the Northern Hemisphere.
Polar Easterly A global wind flowing out of the high pressure zones over the poles toward the sub polar lows while the Coriolis effect turns these winds so that they flow mostly from the east.
Dew Point The temperature at which the relative humidity of an air mass is 100%.
Cloud A mass of extremely tiny liquid water droplets or ice crystals in the atmosphere.
Condensation Nucleus A microscopic particle that is suspended in the air and on which water easily condenses to form droplets.
Freezing Nucleus A microscopic particle suspended in the air on which water easily deposits to form ice crystals.
Fog Stratus clouds at ground level.
Coalescence The process by which droplets join together and grow to form raindrops or hail.
Created by: CoachLeach
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