![]() ![]() A more efficient mechanism (known as the Bergeron-Findeisen process) for producing a precipitation-sized drop is through a process which leads to the rapid growth of ice crystals at the expense of the water vapor present in a cloud. This is not a trivial task since millions of cloud droplets are required to produce a single raindrop. If enough collisions occur to produce a droplet with a fall velocity which exceeds the cloud updraft speed, then it will fall out of the cloud as precipitation. Water droplets may grow as a result of additional condensation of water vapor when the particles collide. ![]() Most of the condensed water in clouds does not fall as precipitation because their fall speed is not large enough to overcome updrafts which support the clouds.įor precipitation to happen, first tiny water droplets must condense on even tinier dust, salt, or smoke particles, which act as a nucleus. If you look closely at a cloud you can see some parts disappearing (evaporating) while other parts are growing (condensation). Water is continually evaporating and condensing in the sky. These droplets are way too small to fall as precipitation, but they are large enough to form visible clouds. The clouds floating overhead contain water vapor and cloud droplets, which are small drops of condensed water. A localized heavy summer rainstorm in Colorado, USA. ![]()
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