![]() One process is called the collision and coalescence or warm rain process. So, there must be a process(es) for the cloud water, or ice, to grow large enough to fall as precipitation. This can be accomplished by forcing the air up and over mountains or, more commonly, by forcing air to rise near fronts and low-pressure areas.Ĭloud droplets and/or ice crystals are too small and too light to fall to the ground as precipitation. The most effective way to do this is by lifting the air. Once the moisture is in place, clouds still need to form. Winds around high- and low-pressure systems (a subject of another lesson) transport this moisture inland. are the Atlantic and Pacific Oceans as well as the Gulf of Mexico. First there must be a source of moisture. In order for precipitation to form, particularly over a large area, several ingredients are necessary. Tsunami Preparedness and Mitigation: Individuals (You!).Preparedness and Mitigation: Communities.The Positive and Negative Side of Lightning.
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