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When clouds develop or precipitation occurs, something is making the ... Several things can make the air rise...Mountains for one! Most blobs of air do not carry shovels with them so they have to go over mountains instead of through them! Cold fronts can cause air to rise as well. Even the jet stream can cause air to rise.
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www.wildwildweather.com/precipitation.htm
www.wildwildweather.com/precipitation.htm
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Can you describe rain/precipitation and all it's functions in terms that a third grader will be able to understand? ... Precipitation in the form of rain or snow occurs when particles of water or ice are large enough to reach the ground. The chief difference between a cloud drop and a rain drop is size.
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www.soest.hawaii.edu/GG/ASK/rain.html
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Upper-level troughs influence many surface weather features, including the formation and movement of surface low pressure areas and the locations of clouds and precipitation. ... Precipitation tends to fall to the east of the trough axis while colder, drier air tends to prevail to the west of the trough.
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www.usatoday.com/weather/tg/wtrough/wtrough.htm
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He knew that at certain temperatures, particles floating in the clouds cause water vapor to crystallize around them. And he remembered the ... "It really intrigued me ... the idea that if these bacteria were blown into the atmosphere and actually got into a cloud that they could induce precipitation," Christner says.
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www.npr.org/templates/story/story.php?storyId=87761584
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When cloud particles become too heavy to remain suspended in the air, they fall to the earth as precipitation. Precipitation occurs in a variety of forms; hail, rain, freezing rain, sleet or snow.
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ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/prcp/home.rxm...
ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/prcp/home.rxml
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Precipitation (meteorology) - Wikipedia, the free encyclopedia
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In meteorology, precipitation (also known as one of the classes of hydrometeors , which are atmospheric water phenomena) is any product of the condensation of atmospheric water vapour that is depo...
en.wikipedia.org/wiki/Precipitation_(meteorology)
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Ice storms are extremely dangerous because the layer of ice on the streets can cause traffic accidents. Ice can also build up on tree branches and power lines, causing them to break and our lights to go out. There is another kind of precipitation that comes from thunderstorms called hail.
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www.wxdude.com/page3.html
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In clouds with temperatures above freezing, turbulent atmospheric mixing can cause droplets to grow through the processes of collision and coalescence. One initial condition, however, must be met for this process to ... The other mechanism of precipitation development involves clouds whose temperature is below freezing.
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www.physicalgeography.net/fundamentals/8f.html
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Frontal precipitation Relief precipitation Convectional precipitation
http://wiki.answers.com/Q/Three_causes_of_precipitation
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