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Weather

Chapter 13

TermDefinition
water cycle The movement of water between the atmosphere and the Earth's surface
evaporation process by which water molecules in liquid water escape into the atmosphere as water vapor
relative humidity ratio of humidity in the air to the amount of water vapor the air can hold.
humidity the amount of water vapor in the air
condensation the process of water vapor turning back into liquid water
dew point the temperature at which condensation begins
cirrus High level, whispy, clouds made of ice crystals
cumulus fluffy, fair weather clouds
cumulonimbus towering clouds that produce thenderstorms
stratus layers of cloud cover that may produce rain
precipitation Any form of water tht falls from clouds - rain, snow, sleet or hail
air mass a huge body of air that has similar temperature, humidity and air pressure
tropical air mass warm, less dense air with lower pressure that form in the tropics
polar air mass cold, high pressure air mass that form north of 50 degrees north or south.
continental air masses that form over land
maritime air masses that form over water
weather front boundary where air masses meet
occluded front when 2 cold air masses lift and trap a warm air mass.
stationary front when 2 different air masses meet but can't overtake the other
storm a violent occurrence in the atmosphere
thunderstorm a small storm accompanied by heavy precipitation, thunder and lightning
lightning an electric discharge as charges jump between clouds, parts of a cloud or between a cloud and the ground
thunder is the sound of the explosion as heated air from lightning expands suddenly and explosively
tornado a rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch Earth's surface
storm surge a dome of water that sweeps across the coast where a hurricane lands.
hurricane a tropical cyclone that has winds over 119 km (74 m) per hour
cyclone A swirling center of low pressure that spin counterclockwise in the Northern hemisphere
anticyclone A swirling center of high pressure that spin clockwise in the Northern hemisphere
Created by: pkolarich
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